Showing posts with label dentistry. Show all posts
Showing posts with label dentistry. Show all posts

Monday, 24 July 2023

Reconstruction of a fractured maxillary central incisor

 This was a ten year old girl who jumped off a wall, fell on her face, and broke her tooth.



The first thing I did was a root canal treatment. Here's the X ray:



That's my assistant's finger.


After cutting retention grooves in the tooth...




I removed about half the root canal filling I had placed...



Then etched the tooth with phosphoric acid...



Followed by filling the space in the root canal I had created with a flowable light cured resin gel...



In which I placed a fibre optic post of the appropriate size which I had already tested for adequate  fit...




Red, in this case (note the red band on the top). The three post sizes most commonly used, in increasing order of diameter: yellow, red, blue.


I then hardened the flowable resin with a light cure unit, sealing the post in place:



(Each subsequent  layer of filling material was similarly hardened.)

Then I started building up the back of the replacement part of the crown with light cured filling material that is extra white to block out the dark shadows of the inside of the mouth which would otherwise  make the replacement look dark:


After building up the back of the crown, I cut off the excess fibre optic post.



Then I started adding more light cured resin filling material of the correct shade to match the other teeth to the front of the built-up crown:


At this stage it's bulky and rough in appearance, and the anatomy doesn't match the other intact incisor. Notice those two notches in the other tooth? The bulges between them are called mamelons, and I had to reproduce them by careful cutting and shaping

Then I polished the filling:



Voila:








Sunday, 2 September 2018

On a Case of Internal Bleaching

(This is the text of an article I wrote for the annual magazine of the state chapter of the Indian Dental Association. I'm not going to attempt to translate any of the terminology. Read it if you want, or not.)

ON A CASE OF INTERNAL BLEACHING

Aesthetics, as we all know, have become an increasingly vital part of contemporary dentistry. We still occasionally come across anterior restorations done, invariably by quacks, with silver amalgam; but in standard dentistry even such materials as silicate cements and self-curing composites are now so obsolete that nobody even remembers them any longer.

In addition to restorations, the options include veneers and crowns, and, of course, the internet makes patients aware that such treatment modalities actually exist – and that they could benefit from them.

We’re also familiar with the experience of encountering patients who want their “teeth whitened” (or, as one particular young man once told me, “whitewashed”) not just to get rid of stains on their teeth, but to lighten the colour. And invariably they know, or have heard of, someone who has had this done.

Today, therefore, the patient has not just a choice of multiple treatment modalities but knowledge that they exist, and more often than not an exaggerated idea of what that treatment might be able to achieve. This becomes a problem when it comes to situations where the patient imagines one particular treatment can work miracles, but the dentist is well aware that it will not....and, try as he or she might, he or she can’t convince the patient of this.

This is especially the case with bleaching. As we all know, bleaching has the following limitations:

First, and the patient usually will refuse to accept this, the amount of bleaching achievable is not predictable. Especially with regard to very dark stains, any lightening of colour that can be achieved will still be far short of satisfactory.

Second, it is not permanent, and with patients who are heavy smokers or tobacco/betel nut chewers, any effect achieved can disappear within an extremely short period of time.

Third, it’s of course not without side effects, most importantly sensitivity, which the patient will more likely than not blame on the dentist even if he or she has been repeatedly warned of this possibility in advance.

Keeping these factors in mind, many teeth are veneered or even crowned that otherwise might have been treated by bleaching. This is expensive in terms of time for the dentist and financially for the patient. And, keeping the average oral hygiene standards and substance chewing habits of people in this part of the country, this creates its own problems in the medium to long term.

On the other hand, there are single discoloured teeth that can be relatively safely, reliably, and economically treated by internal bleaching. This is, of course, only possible in endodontically treated teeth, thereby precluding its use in most instances; but in particular cases it can give very satisfactory results indeed.

Internal bleaching, as with external bleaching, depends on the action of oxygen ions to oxidise stained tissue and thereby lighten its colour. It is more effective because:

First, it acts from within the tooth, and thus the oxygen does not have to penetrate through the hydroxyapatite barrier created by enamel. The dentinal tubules are easily accessed by the oxygen, which can therefore spread to the entire coronal section of the tooth from within.

Secondly, since it can only be performed in endodontically treated teeth, there is no question of tooth sensitivity.

Third, since the action is entirely inside the tooth, as long as there is no further insult to the integrity of the tooth by abrasion, attrition, or caries, any result achieved is long lasting and may be permanent.

In this article we shall discuss such a case.

The patient was a 28-year-old male who presented with a badly discoloured maxillary left central incisor, which he was extremely self-conscious about. He gave a history of having had endodontic treatment performed on it elsewhere several years ago, following which it had got progressively darker, until he thought he had no other option than to have it extracted and get an artificial replacement.

On radiographic examination the tooth showed an incompletely and poorly obturated root canal, but lacking any periapical pathology. There was caries on the lingual fossa of the tooth. This, with leakage of fluids into the incompletely obturated pulp chamber, causing extensive secondary caries inside the coronal section of the tooth, was responsible for the staining.

After discussion, the patient agreed to have the tooth treated by a combination of endodontic therapy and internal bleaching.

In the first step, the gutta percha that had been used elsewhere to obturate the root canal was removed. The canal was cleaned, shaped, enlarged and obturated (with Gutta Percha cone size F3).

In the second step, the carious dentine within the coronal section of the tooth was removed with a round diamond point on an airotor handpiece, being careful not to penetrate the enamel on the facial surface at any point. This also removed a great part of the staining.

In the third step, the gutta percha in the coronal part of the pulp chamber and the apical third of the canal was removed. A cotton wool pledget soaked in hydrogen peroxide was inserted into the pulp chamber and sealed inside using Cavit temporary restoration material (in order to prevent oxygen ions escaping into the oral environment instead of penetrating into the dentinal tubules). This procedure was repeated every alternate day for a period of three weeks.

After three weeks, the patient professed himself satisfied with the amount of tooth lightening achieved. In the fourth step, therefore, the pulp chamber and apical third of the root canal was restored with light cured resin of appropriate shade.

The patient has since reported by telephone that the tooth has given no trouble and that the colour remains completely satisfactory.

Here is the photographic evidence, because seeing is believing:



It’s to be noted, of course, that this is not a suggestion to endodontically treat a vital tooth in order to perform an internal bleach on it. That’s all kinds of malpractice, and we don’t do malpractice.

Do we?


Thursday, 4 May 2017

On Resistance

First off: This is not going to be about the war criminal Killary Klingon pretending to have "joined the resistance".

One day last week, I had severe stomach cramps and diarrhoea which prevented me from going to work. I took a combination dose of Ofloxacin and Ornidazole, which by Thursday evening had almost totally cured me (after only two tablets). This was very surprising, because antibiotic resistance is so rampant these days that one has to wait and see if the medication one prescribes even works. The particular strain of Entamoeba histolytica which had afflicted me must have been utterly unsophisticated. Village yokels in microbiological terms, really.


Back when I was in dental college 25 years ago, the usual medication for infections was Sulphamethoxazole with trimethoprim (Combined Sulpha). More difficult cases might be given Ampicillin or at most Ciprofloxacin. I don't think Combined Sulpha is even manufactured today; there are not many bacteria left that are still vulnerable to it. I haven't prescribed Ampicillin in several years, and as for Ciprofloxacin, one has to cross one's fingers and hope to hell it works.


The effective lifespan of antibiotics is shortening exponentially. Three years ago Azithromycin was a miracle drug, which could smack down just about any infection. Today I already find resistance to it, and the incidence of that is growing. There are already germs which are resistant to absolutely all antibiotics, all.


We are living towards the end of a very brief medical miraculous period in history - between the late 1930s, when antibiotics first became available, and until the point (fast approaching) when antibiotics will do no good whatsoever. Combined with capitalism, overpopulation, climate change and resource depletion, we'll be wiped out long before the likes of terrorists can get around to it.

A huge part of the problem can be put down to three sets of people. The first are the doctors, who prescribe antibiotics for just about anything, at least in this country. More on that later, but if the doctors didn’t hand around antibiotic prescriptions like toffees, there would not be so many microorganisms being exposed to chemicals and learning to grow protein shells and develop enzymes to get past them.

The second lot are the patients. As a medical professional myself, I can certify that the behaviour of patients makes them their own worst enemy. For one thing, they demand “medicines” for all problems, even those which can’t be handled by medication at all. Suppose, now, someone comes to me with severe constant toothache, and I see that there’s no swelling or fever, but an acutely tender tooth with no pus discharge. The obvious answer is that he’s suffering from acute irreversible pulpitis, which is not caused by infection and so can not be treated by antibiotics. The only treatment is root canal therapy, and I tell the person this. In more than half the cases, they demand medicine “for now”. Since I have some integrity, all I can do is give them a painkiller, with the explicit warning that this is not a cure and that they will begin having pain once the effects of the pill wear off.

So what do they do? As soon as the medicine ends, and the pain starts again, they go off to another dentist – cursing me all the while for not curing them – and get given antibiotics by him. Which don’t help, of course, and they wouldn’t even if they took the whole course, but they don’t.

Even where antibiotics are actually necessary, the average specimen doesn’t finish the course. If it’s for, say, three capsules daily for five days, you’d be lucky to get them to take two capsules daily for two days, and then, as soon as the symptoms are tackled, they’ll stop taking it. SO what happens? The germs, of course, have just had the equivalent of a mild dose of poison, and handily acquire resistance to it. And the next time round, when the medicines don’t work at all, guess whom the specimen blames for it?

The third, and worst, set of criminals is the pharmaceutical industry. India has possibly the worst and most corrupt set of pharma companies in the world. One of their standard ploys is to offer medical professionals freebies – from electronic goods at the low end of the scale to fully paid holidays abroad – if they prescribe set quotas of particular medicines. Obviously, whether the specimens need said medicines or not is immaterial; the idea is to sell the drugs, by whatever means. I have myself been called stupid and unrealistic by my own extended family members for retaining enough integrity to not do these things; but I know a huge number do.

These same pharmaceutical companies are also changing the type of medicine they produce, discarding cheaper options. An antibiotic that is still very effective is Amoxycillin, whether in isolation or in combination with Cloxacillin. However, these days it’s hard to find a manufacturer who is still offering either plain Amoxycillin or Amoxycillin+Cloxacillin. Instead, they are almost invariably pushing Amoxycillin with Clavulanic Acid, a combination whose only virtue seems to be that it is something like ten times costlier than Amoxycillin alone. I am yet to find a single reason to prescribe Clavulanic Acid, and I inform medical representatives that I don’t want to hear about it. And then I discover that without Clavulanic Acid combinations, they don’t have any antibiotics at all.

The situation is dire, and nobody wants to even think about it, let alone do something about it. With every day that passes, I feel as though I’m in the position of the Dutch boy standing with his finger in the dyke.

Unfortunately, while he’s busy trying to plug the tiny hole, the sea wall is collapsing on both sides of him.


Monday, 3 April 2017

Blood and Pain and Suffering

As you all know, I enjoy inflicting pain and suffering on helpless victims, which include the pain and suffering I inflict on you all by forcing you to look at my handiwork.

Yes, I am a cruel sadist. Why on earth do you imagine I’m called Bill the Butcher? Huh?

All right, this 35 year old lady arrived with tooth pain in the lower right jaw. As you can see in this photo, there was an almost completely submerged wisdom tooth buried in the gum, with only the tip of one cusp showing.




I took an X Ray, which revealed a vertical impaction, in which the tooth is vertically embedded in the bone and gum. It’s quite a rare form of impaction, actually, and vertically impacted teeth are surprisingly hard to extract because they’re very difficult to loosen in the socket.



So I anesthetised her and started the job. Here you can see a periosteal elevator being used to detach the gum from around the tooth.



Then, with a Number 15 Bard Parker Knife, I cut a flap in the gum to expose the bone and as much of the crown of the tooth as possible. Here you can see the flap, somewhat obscured by already coagulating blood.



The tooth was mostly deeply embedded in the bone, with no way to grasp it with a pair of extraction forceps, so I cut a gutter in the bone around the crown, with a tungsten carbide bur mounted in a straight airotor handpiece.



Here you can see the gutter clearly, between the tooth and the jawbone.






This permitted me to introduce an Apexolever elevator between the tooth and the bone, and lever it  out of the jaw.





However, it did leave a gaping open socket...



...which I closed with a single black silk suture.




Any questions? Apartfrom asking me why the hell I inflict these on you, I mean?


Saturday, 11 February 2017

Warning: Photos Featuring Extreme Bloodshed and Violence

Before I begin: do not read this article! There is much bloodshed and violence to living tissues herein! Horror and manglement!

This is your last warning!!!!!1!!!!!!

OK, so you decided to read further? On your own head be it. Don’t say I didn’t warn you.

One of my colleagues referred a 33 year old male specimen to me. Said specimen had had pain and swelling in the back of the upper right jaw and great difficulty in opening his mouth, a condition that suggested an impacted, that is, crooked and partially erupted, wisdom tooth. Sure enough, after his pain, swelling, and jaw stiffness had been cured with antibiotics and muscle relaxants, the X Ray I took showed an impacted upper third molar, which you can see here, arrowed for your convenience.



The only solution for the problem was to remove the tooth, which is very easy to say but not so easy to do. Here’s why.

Note that the tooth is pointing forwards at an angle. This is known as a mesioangular impaction.It is very common in lower wisdom teeth, but rather rare in uppers. Apart from the rarity, there was no space to spare between the front of the tooth and the back of the tooth in front, which meant that I couldn’t stick an instrument between them and lever the tooth downwards.

That, actually, was just the start of my difficulties.

Here is what I saw when I checked the tooth in the jaw. In this photo, you can see that only a tiny part (the tip of one edge of the crown, as it happens) of the tooth is visible. Like many of the following images, this one was photographed in reflection in my mirror.



For greater clarity, I’ve marked the tooth in the photo with a black circle and arrow.



Here, in the X Ray, is what I could actually see of the tooth:



Obviously, the vast majority of the tooth being buried in the jawbone, I’d have to expose it and remove enough bone around it to be able to take it out. Here, I am cutting a flap in the gum using a No 15 Bard Parker Knife blade:



After that, I used a tungsten carbide bur mounted in an airotor surgical straight handpiece to drill away bone on both sides of the tooth, as you can see in the photo below. After that, I attempted to loosen it in its socket but was unable to do so; there was still far too much bone around it. Accordingly, I decided to cut a groove in the tooth itself and use it as a lodgement point for an instrument called an elevator.



With an elevator in the groove I’d cut in the tooth, I drew it down and out. Here’s the tooth.




I’ve marked the groove I cut with a black circle.




Now, though the tooth was out, there was a large open wound in the gum around the socket, which I’d have to close:





It took two black silk sutures to close the wound, but it was very successfully closed, as you can see. 



In case you can't see, I’ve marked the stitches for you.




Some days I think I am not totally incompetent at my job.



Sunday, 28 August 2016

A Tale of Teeth: The Death of Dentistry

Dentistry is dying. To be more precise, it's been murdered.

This may seem a strange statement to make, but I’ll explain.

Twenty years ago, dentistry was the up and coming profession in India, to the extent that the magazine Outlook even published a puff piece on it in circa 1997 (titled Dentists: The New Buccaneers, if I recall correctly).  The article was full of mistakes and idiotic statements, such as the claim that a root canal treatment is “normally” completed in three sessions (and if it isn’t, your dentist is a “mercenary molar mechanic”, a bit of alliteration that must have warmed the cockles of some sub-editor’s heart). But it did make the very important observation that dentistry, once a profession held in contempt and filled with those who couldn’t make it as physicians, was now an increasingly respected, lucrative, and sought after line of work.

And that is exactly what killed it.

Until the late 1970s, there weren’t that many dentists. Indians, back then, didn’t really give a damn about teeth. The attitude was that as soon as your teeth started giving trouble, you’d get them all taken out and replaced with dentures. Obviously this didn’t exactly require dentists with a lot of expertise in the job. Not surprisingly, the average dentist then was a quack who learnt his “skills” as an apprentice with another quack.

I recall being taken by my father to one of these quacks, one “Dr” Prabhat Bhattacharya, while I was a schoolboy. This Bhattacharya was very popular with the Middle Class of the day, which was stingy to the bone, because he was much cheaper than the two qualified dentists this city boasted at the time. He had an old wooden barber’s chair as a “dental chair”, and used a hanging motor – which is actually used for laboratory work like trimming and polishing dentures – to do his “fillings”.

This Bhattacharya looked lugubriously at my teeth, shaking his head mournfully, and declared “The enamel is spoilt, nothing can be done now”. This, I later found, was his standard response to anything that might even need filling, and the way he escaped having to do the incredibly difficult job of removing decayed tooth tissue and replacing it with filling material. Fortunately, my father took me to one of the two real dentists, who filled it with a simple filling, which is still in place to this day, over 30 years later.

Actually, Bhattacharya was absolutely typical of the kind of quack which infested Indian dentistry at the time, and examples of which can still sometimes be found here and there. They can be fairly easily recognised from their signboards. For one thing, they’ll never have a degree after their name (I’ll mention some qualified dentists these days who add an additional “degree” after their names in a moment). For another, their shingles will always proclaim proudly that they’re “specialists” in something, usually dentures. And in a huge majority of these cases, there’s going to be a large, pastel coloured denture on top of the quack’s name – usually, one of the type prevalent seventy or more years ago, with a suction cup on top holding it to the palate.

Since people, as I said, neither cared about their teeth, nor wanted to spend money on them, there was nothing stopping these mountebanks from making a good living.

Their equipment also followed the same standards. The basic dental electric motor, invented in the late 19th Century, only became available to Indian dentists in the early 1970s. Previous to that they’d been using a kind of sewing machine contraption with a treadle. I saw at least two of these still for sale in a dental showroom in the late 1990s and was assured by the dealer that “unqualified doctors” still bought them. As late as the early 1990s, when I was a student, we read about the light-cure unit, which is used to harden filling material after placing it in teeth, in our textbooks – but never saw one, because our dental college did not have a single light cure unit.

This dental college was one of the top in the country then, and even in 2016 is Number Six in the dental college list. Think about that. One of the very topmost dental colleges in the nation didn’t have a basic piece of equipment.

I first saw a light cure unit in 1996 with a private practitioner, in Calcutta. Today, I have no less than two of my own, and can’t imagine surviving without them.

Now, one of the side effects of the “economic liberalisation” of the early 90s was that suddenly people became rather more appearance-conscious, and willing to spend some money on this. Not health-conscious, just appearance-conscious, but as far as dentistry goes, good appearance pretty much implies you have to have good dental health as well. And this, of course, meant in turn that dentistry suddenly began attracting more money than it used to do.

Suddenly, the dental showrooms turned from dingy little holes in the back passages of decaying commercial buildings into swank establishments with plate glass windows proudly exhibiting the latest model dental chairs, rather like car dealerships. Suddenly, they began sponsoring dental conferences, spending money on making themselves known, and, for instance, dentists who’d never even seen a full range of scaling hand instruments were being invited to buy the latest ultrasonic sets. And, like it or not, they had to, because everyone else was doing it.

In fact, I’d call the Dental Revolution of the late 1990s the equivalent of the modernisation of Japan in the Meiji period of the latter half of the 19th Century. Overnight, the material and equipment we’d had to study about in our textbooks, without ever expecting to see or use them, were at our fingertips. Suddenly, the average person discovered that there was much, much more to be done with their teeth than just extract them if they began to hurt.

And, of course, the market for dentists then exploded. From being a neglected sideline, it became a sought after qualification. Instead of young people settling for dentistry as a consolation prize if they didn’t get to study medicine, they went into dentistry as a first choice. Dental colleges suddenly no longer found it necessary to disguise themselves as annexes to older, more prestigious, medical colleges. And the Dental Council of India (DCI), the governing body of the dental profession, saw a golden opportunity.

I should take a moment to speak of the DCI and its equivalent in the medicine line, the Medical Council of India (MCI). Both organisations, at the top level, are rotten with corruption. A couple of years ago, the MCI’s President was even arrested for massive corruption, but of course nothing ever happened to him.

One of the ways this corruption worked is this: remember the bonanza for the dental companies I mentioned? It’s an open secret that the MCI and DCI take kickbacks from the dental and pharmaceutical companies, and do all they can to ensure these companies become richer. And with the sudden growth of dentistry in the late 90s, the DCI got into the business of private colleges.

It was extremely simple – anyone with the right connections would start a private dental college, and charge enormous fees from students to attend it. Many of these “colleges” had hardly any equipment, or patients, or even teachers. If a “surprise” inspection from the DCI was ever scheduled, the college would be tipped off well in time, and the owner would hire dentists to turn up and pose as “teachers” while random people from the streets would be bribed to pose as patients. Everyone, including the inspectors, knew what was going on, of course, but nobody cared as long as the money kept flowing in.

You can well imagine the standard of the “graduates” turned out of these colleges. Now, as I said, my college was primitive in terms of equipment, and some of the teachers were, let’s say, not particularly interested in teaching...but I’m willing to bet a fair amount that I, and any of my colleagues, are highly competent professionals at least as good or better than the best of the West. This is not a boast. It’s based on my observations of the standard of work I, and my colleagues, are capable of...and what I’ve seen of the handiwork of American and British dentists. But these private college degree-shoppers are nothing like that.

I recall more than one of these worthies turning up at my clinic begging rather pathetically for a job. Hardly any of them had even performed a root canal on a molar tooth in their lives. Not one of them had ever extracted an impacted wisdom tooth. And as for doing such surgeries as an apicoectomy, something I did several times as an intern? They’d have a heart attack if anyone had even suggested it.

Not that the DCI people were ignorant of this. Now, to them, dentistry was a lucrative business, and they were intent on pushing their children into it as well. Most of their children didn’t have the intellectual power to get through the rather tough selection exams of the government dental colleges, though...and the government dental colleges had the only real degrees going.

So they found a solution. They’d pay for their kids to enter a private college, and then transfer to a government college. At the time when they first did this – 1992 – it was still totally illegal. So their further solution was to go to the Supreme Court to get it legalised. With money to pay top lawyers, and nobody opposing them, it was easy.

I remember the first set of these transfers who appeared in our college. In 1992, they entered the class immediately junior to us – the “90 Batch”, which started its course in late 1990. Several of them were teachers’ children, and others were the kids of sundry politicians and other bigshots. By then, they’d all already completed a year or more in various private colleges – but you never saw such an incompetent bunch in your life. I remember one, the daughter of a police chief if memory serves, who was asked to adapt a baseplate (a sheet of hard wax) on a plaster cast of the jaw. A beginner normally breaks several baseplates before first succeeding.

Not this young lady. She didn’t break the baseplate. She broke the cast instead.

Now, there was a problem. These transfers, as I said, joined in 1992, about halfway through the academic year as I recall. In order to appear for the year ending examinations, the Second Professional as it’s known (there are four, one at the end of each year), they needed a certain minimum attendance. And of course they didn’t have it. They could not, legally, appear for the exam.

This, of course was not a state of affairs that could be tolerated. The teachers and bigshots hadn’t spent all the money and effort getting their kids into the college to have them balked in this fashion. They tried a trick as transparent as it was guaranteed to succeed.

What they did was claim that the attendance records of most of the class had gone missing. Not all the class – that would have raised questions – but most, something like 75%. So only 25% of the 90 Batch could appear in the Second Professional Examinations unless...

...unless, of course, they were all allowed to appear. And so it was done. And – you’ll be totally astonished to hear – the teachers’ kids all got medals and certificates for their performances.

You’re astonished, right? I thought so.

This was the kind of thing that happened in a government dental college, a good one. In the private colleges, of course, even the minimal checks and balances were dispensed with, and incompetent nincompoops began pouring out by the tens of thousands, with the exact same degree we’d sweated blood to earn.

Can you imagine what this did to the dental profession?

Suddenly, starting in the late 2010s, dentistry was no longer a star-spangled profession. Suddenly, new dental graduates could no longer get a job to save their lives. Suddenly, more than half of them, with a dental degree – even a proper degree, from a government college – found it so impossible to get a job that they ended up looking for work as a call centre operator or a salesperson. And still the number of dental colleges grew, and grew, and grew.

These days, it’s the qualified dentists who, to pretend to be more qualified than they are, have started adding fake “degrees” to their names. One standard one is to call themselves MIDA, which actually stands for Member of the Indian Dental Association. It sounds like some achievement like the British FRCS, but all you need to be an Indian Dental Association member is a dental degree and a couple of thousand rupees annual membership fee. I’m an IDA member myself. There’s nothing special about it. But the shrinking market means qualified dentists now have to pretend to be what they aren’t.

Obviously, nothing of this – nothing at all – was unknown to us dentists. We saw the carnage with our own eyes. But apparently the only ones who didn’t see it, who were wholly oblivious of it, were our masters in the DCI.

Their “reasoning” seemed to go this way: “India has 1300 million people, and x number of dentists. Therefore there are only y dentists per 10000 people, while in other countries there are as many as z dentists for just 1000. Therefore we need more dentists.”

Really? In the first place, and this is something they’d know if they were actual dentists and not simply jacked-up administrators with dental degrees, we need better dentists, not ham-handed incompetents who occupy jobs without the slightest idea of how to do the work. Secondly, almost all Indian dentists are in the cities and towns, and will always remain in the cities and towns, where the market is already saturated. The villages? Well, for one thing, they’re far too poor to afford dental care, and with “economic liberalisation” they’re getting poorer still. Secondly, the villagers of India don’t care about good dental care and never will. To them, a twig is better than a toothbrush, and such newfangled notions as getting your teeth cleaned by a dentist are anathema.

By 2015 the situation had deteriorated to the extent that student composition in dental colleges had changed. Back when I was a student, the law mandated that 50% of the places had to be reserved for women, though the colleges always struggled to make up that number. The average class usually had about 30% females to 70% males. Nowadays, as someone in a position to know assured me, it’s about 80% female to 20% male.

But isn’t that a good thing? Aren’t more women with professional degrees a sign of progress?

Not if you realise that the vast majority of these ladies are never going to land a job in dentistry, and in fact have no intention of landing a job in dentistry. Their only purpose is to add a “Doctor” in front of their names, so as to increase their value in the marriage stakes. That is all it is.

Early this year, one of my former classmates, who’s a teacher in a private college, and is thoroughly disillusioned, informed our alumni WhatsApp group that all private dental colleges in her state have handed the staff a compulsory 40% pay cut. I assume holidays in Hong Kong and Amerikastan are right out in future for her. Quelle horreur.

It was only as late as April 2016 that the DCI finally admitted that something was wrong, and began to take steps. What steps did it take? Did it shut down the useless private degree shops? No. Of course not. All it did was declare that no new dental colleges would be set up.

The golden goose is killed, and they’re still hunting in its beak for teeth. Even though geese don’t have teeth.

But I doubt if private college “graduates” know that anyway.

   
[Image Source]

Friday, 29 April 2016

Warning: Very Boring Article About Dentistry

Listen: this is probably going to be a boring post for the vast majority of you. It’s about dentistry, after all.

Since it’s boring, you don’t really need to read further; I won’t mind.

Well, for those of you who have chosen to read on, here’s what:

Recently – very recently, as of this morning – I finished constructing a complete denture for a specimen with no teeth in her lower jaw. Not only did she have no teeth in her lower jaw, she had almost no gum left either. This is something that happens in people who lose their teeth at an early age (this specimen was 57 and had lost her teeth years ago), and especially if they lose their teeth to gum disease. Gum disease – gingivitis and periodontitis – causes the bone and gum to shrink drastically around the roots of teeth, causing them to loosen and fall out. The remaining bone that used to be around the roots of the teeth is then useless since there is no tooth for it to contain, so it’s quite quickly absorbed by the body. In the end there’s only the basal jawbone left, and even that slowly disappears over the years. I have seen people with such attenuated jaws that they have literally broken their mouths simply from the effort of chewing.

I am not making this up.

Now, if we are going to give removable false teeth (dentures) to people, those dentures have to attach to something to stay in place. If there are other teeth, the dentures can be attached to them in a variety of ways, for example clasps and retainers, or by being adapted around them. However, if there are no remaining teeth, then the dentures are entirely dependent on their contact with the gum to stay in place, by the phenomenon (which you may vaguely remember hearing of in school physics class) called surface tension. The greater the extent of the remaining gum, the greater the surface tension, and the better the denture stays in place.

However, when the jawbone is badly shrunken, we have a whole mess of problems. In the first place, the lack of bone means that there’s hardly any gum at all, and the little that’s left is usually a roll of soft tissue that slides around under pressure instead of staying in one place. Secondly, if there’s some gum, the margins of the denture can be kept far enough away from the cheeks, lips and tongue that they don’t push it away when the person talks or eats. However, when there’s no gum, even the slightest movement of the tongue or cheeks tends to push the denture off the tissue.

Obviously, then, it’s not easy to do such a denture. Often, the best option would be implants – titanium screws fitted surgically in the jawbone on top of which the denture can be attached – but they are expensive, and in many cases they are simply not possible. So we have to do the best we can.

Before I go further, I need to take a few minutes to explain, as simply as possible, how we go about making a denture in people with no teeth:

First, we take an impression of the jaw using a stainless steel tray of the appropriate size using a relatively stiff material. This is because the tray doesn’t approximate very closely to the jaw shape and we need a better adaptation to get a good impression. What this relatively stiff material is varies; in the past I used to use (as they still use in dental colleges) a heat-softened wax called composition material, but these days I use a heavy-bodied silicone rubber. Then, you can do two things; you can either make a model of the jaw by pouring plaster of Paris into the impression, and make a second tray on that; or you can simply scrape the top surface of the impression away. In either case, a soft, flowing material (I used to use zinc oxide paste, an extremely messy substance; now I use a light bodied silicone rubber) is placed on the new tray or the scraped impression to take a second, more detailed impression. Clear so far?

Once this second impression hardens, we pour plaster of Paris into it to make a model (cast) of the jaw. On this cast we adapt a baseplate of hard wax or acrylic resin (generally hard wax when there’s sufficient gum available, and the much stronger acrylic resin when it isn’t). This acrylic resin is “cold cured” – doesn’t need heating to harden. On top of the baseplate we attack a curved block of softer modelling wax in which we then put the acrylic denture teeth and try them in the mouth. 

Once the position of the teeth, their appearance, etc are finalised, we make a mould around the wax, teeth and cast of more plaster of Paris. Then we boil off the wax and remove the baseplate, fill the mould with denture base acrylic, which is “heat cured” – needs heating to harden – and then heat it until it bonds with the teeth. We can then remove it and polish it, and that is the denture. 

As I said, in cases where the gum is badly shrunken, what happens is that the remaining bone has only a tiny roll of soft tissue over it, and that’s all the gum there is in the mouth. The heavy impression material, instead of recording this gum, presses it flat, and the light flowing material can’t take a proper impression of something that has been flattened. So you end up with a cast with no gum whatever. Of course, the final denture that comes out of the mould then has no gum either, is totally flat at the bottom, and floats around in the specimen’s mouth without being seated on the gum at all.

Now, long ago, when I was a student in dental college, I had an idea. I suggested it to the teachers, who shot it down immediately. But this specimen of mine brought this idea back to my mind.

My idea was, when you make the cast and adapt the acrylic resin baseplate, you should then take that baseplate, grind the bottom hollow, fill it with more semi liquid acrylic resin, which as I said is cold-cured and so doesn’t need heat to harden, and put it into the specimen’s mouth. Allow it to harden in the specimen’s mouth, take it out, grind and shape it until it fits well, and then pour a second cast from that baseplate. Use the baseplate on the second cast to make the denture as described.

Since I am no longer under the jurisdiction of the teachers, I tried it in the specimen and the first and second casts show the difference clearly.

First, here’s the specimen’s mouth, showing almost no gum at all.



This is the cast poured from the first impression. Note that you can see no gum at all, especially in the front of the jaw (to the left of the photo).



This is the cast poured from the baseplate I adapted in the specimen’s mouth. Look at the left of the cast, and you’ll see a roll of gum tissue which was absolutely not visible in the first cast. Also, since I adapted the baseplate in the mouth, I trimmed the edges so that the lip and tongue movements didn’t push it away.



This is the wax block adapted on the baseplate.



This is the baseplate, seen from the lower surface.



These are the teeth placed in the wax, after positioning in the specimen’s mouth. Note that on the right side of her mouth the teeth are much higher and towards the cheek than on her left side, where they are depressed and irregular. The reason for this is that on the right side her upper teeth are placed further towards the cheek, while on the left side her upper teeth have migrated downwards until they’re almost touching the lower gum. Therefore I had to arrange the teeth irregularly in order for her to be able to chew evenly. Otherwise, if I’d placed the two sides at the same level, I’d have had to leave a gap between the upper teeth and the denture teeth on the right side, and when she chewed on the left side the denture – having no teeth opposite it on the upper right – would have tilted off the gum.






And yet, my erstwhile teachers would have intensely strongly frowned on my arrangement of teeth here, and would have demanded that I mount the teeth in the wax as though the human specimen was a practice set-up in the laboratory, where everything is supposed to conform to an ideal. No wonder the usual specimen in the clinics back in the college usually went away far from happy.

Here’s the denture after being separated from the mould. It’s not yet been polished.







And here is the cast, still in the lower half of the mould.



The cast doesn’t usually survive the denture preparation, but this one did. I gave it to the specimen, in the same state as you can see in this picture. The idea is that if the denture breaks at any time, she can bring the pieces and the cast back to me, and I can place the pieces on the cast and repair the denture with fresh material along the fracture line. If the cast isn’t there, the broken pieces have to be approximated as best one can, stuck together with hard wax, a new cast poured, and the denture then repaired. There’s always some distortion and the denture then has to be readjusted in the specimen’s mouth, a troublesome and far from always successful endeavour.

So here is the denture, after polishing:



And here it is in the specimen’s mouth:



Was she happy? Yes, she was happy. She was happy enough to pay me extra and insist I take the money.

It feels good when somebody actually appreciates the effort you go to for them!