Showing posts with label 3rd molars. Show all posts
Showing posts with label 3rd molars. Show all posts

Sunday, 3 November 2013

Wisdom twooth

Hello all.

If you have returned for the second instalment of my wisdom tooth rant then I thank you! I realise the last one was a bit of a slog but hopefully it provided some basic information about the problems wisdom teeth cause.

I discussed pericoronitis last time, which is the most common problem wisdom teeth cause. I also briefly mentioned that if you rocked up to your dentist, or worse, the dental hospital, demanding extraction (whipping out) of your wisdom teeth because they don’t look very nice, they are the cause of all your life problems (failure of your marriage, loss of job etc) then sadly you will be met by a wall of silence and handed a “bye bye” discharge letter.

Unfortunately, as with most things, there are risks to taking out all teeth. Wisdom teeth are particularly troublesome (to put it mildly, I would quite frankly say they are a pain in the arse) to take out.  This is mostly because of the position right at the back of the mouth, or as mentioned before that they are literally wedged in place often below the gum line. They are also a bit of an anomaly. Whilst most teeth have a generally accepted anatomy, wisdom teeth are a law unto themselves, a bit like Miley Cyrus or Lady Gaga – you never know what you’re going to get from one day to the next. They can have 1-3 roots of different angles, either splayed out or fused together. They can be surrounded by bone, or even be fused to the jaw bone. Therefore, if we can avoid taking them out – much as we enjoy getting out our pneumatic drills and nail guns – if you don’t absolutely need them removing, you don’t get them extracted. Especially not by me.

The most important reason for why we are hesitant about taking wisdom teeth out however is due to unavoidable potential side effects, the most important being nerve damage.

In order to explain this I am sadly going to have to describe the process of extracting wisdom teeth in some detail. If you are at all squeamish, you may wish to skim over this bit.

Of course, if you have a fully erupted wisdom tooth, i.e. it is fully visible in the mouth just like all the other (normal, non-pain-in-the-arse-causing) teeth, then the procedure for taking it out is no different to other teeth.
However when the tooth is partially erupted, or unerupted, it is surrounded by bone and there is very little/no tooth to grab hold of with our highly advanced sci-fi (not) forceps. In this case we have to do something called “minor oral surgery”. As opposed to major oral surgery which I imagine entails something similar to beheading and fortunately not performed by any of us toothworkers. Well, not intentionally anyway.

Minor oral surgery for wisdom teeth
As the wisdom tooth is surrounded by bone, in order to take it out, we have to remove some of this bone, and the only way to do this is peel back (sorry, I desperately consulted several thesauruses for a better way of phrasing this but this genuinely is the best way of describing what we do) the gum and then drill away some of the bone in the same way that we drill to do a filling.

Before you go into panic mode, the important thing to remember is that the only difference between a “normal” extraction and this method is that we directly visualise the roots of the teeth that we are trying to take out. In some ways this is actually easier and often means that less “force” is required to take the teeth out as we can get a better leverage and see exactly what we are working with – i.e. 3 roots, 2 roots, fused roots etc.
The same amount of anaesthetic (if not slightly more because we often book longer for this minor oral surgery appointments than we do for regular extractions) is used, and the only difference you will actually be aware of is the noise/vibration that occurs when removing bone, and the fact that you will have some stitches in place afterwards.
So here goes.

How to (surgically) take out a wisdom tooth for dummies.
1)    2 or 3 cuts are made in the gum. Again, please remember you will be completely numb for this, so you will feel that we are there/pressure but not pain.

2)    The wisdom tooth will then be hidden behind a layer of bone.
Sadly, Google seems to want to terrify people into never attending a dentist ever again and thus most pictures I could locate were not appropriate for this blog, unless I want to do myself out of employment of course.


 It is at this point that I suppose the most “risky” aspect of the extraction arises.

  

This nerve supplies sensation i.e. feeling for HALF the lower lip (the half being whichever side the tooth you are talking about is, i.e. right tooth, right half of lip), some of the skin of the cheek, and half of the lower teeth. It is important to mention that it does not provide motor or movement supply to these areas.
When extracting LOWER wisdom teeth damage can occur to this nerve. The wisdom tooth can be sitting on the nerve and when it gets wiggled out this can irritate the nerve. The roots can be wrapped around the nerve and on taking it out more damage can occur. Sometimes the tooth itself is not actually touching the nerve but in order to extract the tooth, bone has to be removed and this can cause damage to the nerve. See below. #freeadvertisingforthisguy






This means that following the extraction it will feel like you are still numb. Like when you have an injection before a filling for a lower tooth, that sensation will continue past the time when the anaesthetic wears off. There are various figures in the literature about 1) the chances of this damage happening and 2) whether or not the sensation comes back.  They estimate that there is around a 2% risk of damage occurring to this nerve during lower wisdom tooth extraction. Of course if you need an upper tooth out, this risk is irrelevant. In terms of whether this sensation will return, there is again debatable evidence. It is most common that the disturbance to feeling is temporary i.e. it will return, usually fully, however it is estimated that 0.6 to 2.2 percent of cases of people who lose sensation after wisdom tooth extraction will have this permanently.
What this means in terms of your daily life is that nothing will be visibly different either whilst your face is still, or if your face is moving. Your lip etc will move normally, it will just feel different i.e. numb or have a pins and needles sensation. It is however important to point out that there is a small chance that by leaving infection or pathologies (e.g. cysts) around wisdom teeth, the same nerve damage can occur but is much less predictable so it really is best to get them out in this case.  

Whilst we will always take an xray of the tooth to be extracted, and have a good idea of where the nerve is positioned, radiographs (x ray images) are only a 2D image of a 3D situation so the only really guaranteed information they can give us is “yes the tooth is close to the nerve” or “no the tooth is miles away”. Luckily some Hungarian oral surgeons have completed a study and summarise this nicely “radiography [i.e. taking and interpretation of x ray pictures] is an inadequate screening method for predicting IAN [inferior alveolar nerve] paraesthesia after mandibular [i.e. lower] third molar removal



Back to the surgical bit….


3)    Following bone removal so that we can see the tooth,  it is then extracted. This is done in a number of ways but for the purposes of how much you need to know and what you will be aware of, at this point you will feel pressure and lots of wiggling of equipment from our part.
4)    Once the tooth is out, we will then replace the flap back over the area and place a couple of stiches to hold it in place. These will dissolve by themselves but you will of course be aware of them.

As with any extraction, you will be sore afterwards. As you can see, the procedure is slightly more involved than the normal, grab-it-pull-it-out technique that we can use on other teeth, so expect to feel a bit naf for a few days. Your dentist will give you lots of aftercare instructions and things to expect straight after you have gone through this and thus you won’t listen to a word so I will summarise.


1)    Pain, swelling.  I have lumped these 2 together because it is pretty much guaranteed that you will experience these. In terms of pain, the best medication to take is paracetamol and ibuprofen. You do not require codeine or in fact as I have been asked for on several occasions – ketamine. Please check that you are ok to take ibuprofen. It is one of a group of drugs called NSAID’s and can cause problems for certain asthma sufferers, people with kidney disease, stomach problems etc. Also, if you are already taking an anti-inflammatory medication e.g. for arthritis, back pain, then do not increase your dose.
Swelling will reach a maximum after 48 hours then begin to go down. You may also notice some bruising if it is a particularly difficult extraction. Expect the worse basically, then you will be pleasantly surprised.
2)    Bleeding. This is where people get confused. If you have the tooth “surgically” removed, the wound will be stitched. This can help reduce but not eliminate bleeding. If you do not have stitches, there will be some oozing of the area. The small amount of blood coming from the socket where the tooth was taken from, mixes with saliva and causes people to panic that they are bleeding out and have seconds to left to live without a transfusion.
We will usually give you some squares of gauze to take home with you. If you feel that the area is actually bleeding, i.e. when you spit out, it is red not just pink, then roll one of these gauze pieces up into a sausage and bite for 20 mins. If bleeding continues you need to return to your own dentist or go to A+E.
3)    Infection. When you cut yourself elsewhere on the body, in order for it to heal you want a scab to form. In the mouth it is a similar concept but you want a blood clot rather than a scab. If you do a gym session, lift heavy objects, raise your blood pressure in any number of ways, this will dislodge the clot and leave a gunky mess in the socket. Gunky mess = no healing. Similarly, if you decide to leave the dental surgery and have a fag, the same thing will occur. You will then come back crying to us in more pain than you were with the toothache, with something called “dry socket”.
Heat will also increase blood pressure, so don’t hold anything hot against the side of the face to try and ease discomfort because it will just make it worse in the long run.





If this does occur, go back to the dentist and we will place a dressing in. This works wonders but it tastes repulsive so let that be a warning to you.

4)    In terms of keeping the area clean, brush the other teeth as normal. SPIT DON’T RINSE FOR 24 HOURS. As above, if you rinse and swill around the mouth vigorously, you will dislodge the blood clot and end up in the above situation. For 24 hours just spit out any blood stained saliva you feel is building up. After 24 hours, start with some hot salt water mouthwashes. Get some hot water, fill a mug or a cup, add a teaspoon of salt, GENTLY swish this around your mouth and spit out until the cup of water is gone. If you don’t do this, you will get nice bits of your roast dinner, cereal etc building up in the socket which then I have to fish out. Usually before lunch. Please save me having to do this.
5)    If you have any concerns, please just ring your dentist. They can advise you, settle worries, and recommend you come in for a check if necessary.

Finally, just when you are wondering why the hell anyone would choose to do this to themselves, there are a number of myths surrounding extraction of wisdom teeth and why/when we take them out. For this I require the assistance of the wonderful people at the National Institute for Clinical Excellent (NICE) who provide helpful although thoroughly not-NICE guidance on a number of clinical topics.

Because of the aforementioned risks of taking wisdom teeth out – pain, bleeding, swelling, infection, nerve damage etc – we will try not to do it if we can. NICE in fact says that there is no reliable research to suggest that impacted wisdom teeth free from disease should be operated on.
They classify “disease” as decay which cannot be fixed by filling or root canal treatment, either because it has gone too far or because the tooth is at such an angle that we simply cannot treat it. Similarly, if it is causing damage to next door teeth, this is a valid reason for removal. Wisdom teeth are also deemed to be valid for “the bucket” if they are in the path of a cysts, tumour, or cancer which needs removal.
In terms of the aforementioned pericoronitis, NICE basically suggest it is a bit of an opinion based deicision. They state that “plaque formation is a risk factor but is not in itself an indication for surgery…The evidence suggests that a first episode of pericoronitis, unless particularly severe, should not be considered an indication for surgery. Second or subsequent episodes should be considered the appropriate indication for surgery”. I.e. unless you have been back to the dentist several times with this problem, and we can see that you have been trying to resolve the situation yourself by keeping it clean, you will not qualify to have the tooth taken out.

To finish, the common myth that eruption of wisdom teeth causes crowding of the other teeth. I was going to paraphrase this paragraph from oralhealthgroup.com but it just summaries the absolute ludicrousy that this concept presents.
“It is not possible for lower third molars, which develop in the…interior bone…with no firm support, to push 14 other teeth with roots implanted vertically like the pegs of a picket fence so that the incisors in the middle twist and overlap. Third molars do not possess sufficient force to move other teeth. They cannot cause crowding and overlapping of the incisors, and any such association is not causation.

This is also supported by a number of studies of high evidence level (i.e. they were conducted by the highest level of boffin). I have included some of these below with boffin-normal person translations:

1)    No statistically significant third molar presence-specific differences were recorded in the lower dental arch crowding between the groups with erupted and unerupted third molars. i.e. people with crowding were examined and among these people it was noted whether or not they had wisdom teeth present. The study found that the crowding was completely unrelated to the presence of 3rd molars.

2)    The principal conclusion drawn from this randomized prospective study is that the removal of third molars to reduce or prevent late incisor crowding cannot be justified. Now us tooth workers love nothing more than whipping out teeth so this is a fairly significant finding. 

3)    The dental arches in the extraction group tended to be more crowded than in the group with complete dentitions. i.e. this study found that in cases where wisdom teeth had been extracted there was in fact MORE crowding. This is most likely a coincidence but just goes to show the lack of importance of wisdom teeth on crowding.

4)    This study has not been able to predict which patients should react favourably or unfavourably to removal of the third lower molars in cases of anticipated crowding. I.e. these guys haven’t got a clue.


In summary, if you are in pain from your wisdom tooth, get it out. Yes there are risks but there are also risks of leaving infection teeth in place.

As always, if I have terrified you and you wish to tell me this, or if you want any further explanation of any aspect, please feel free to comment on here, or follow me on twitter @smiles__better.


Ode to the boffins:

Forsberg Tooth size, spacing, and crowding in relation to eruption or impaction of third molars American Journal of Orthodontics and Dentofacial Orthopedics Volume 94, Issue 1, July 1988, Pages 57–62
Friedman The Prophylactic Extraction of Third Molars: A Public Health Hazard Am J Public Health. 2007 September; 97(9): 1554–1559.

Harradine NW, Pearson MH, Toth B. The effect of extraction of third molars on late lower incisor crowding: a randomized controlled trial. Br J Orthod. 1998 May;25(2):117-22.

Lindqvist, Extraction of third molars in cases of anticipated crowding in the lower jaw American Journal of Orthodontics Volume 81, Issue 2, February 1982, Pages 130–139

NICE guidelines: Guidance on the Extraction of Wisdom Teeth


Sidlauskas A, Trakiniene G. Effect of the lower third molars on the lower dental arch crowding. Stomatologija. 2006;8(3):80-4.

Szalma J The prognostic value of panoramic radiography of inferior alveolar nerve damage after mandibular third molar removal: retrospective study of 400 cases. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2010 Feb;109(2):294-302. Epub 2009 Oct 20.

http://www.toothology.net/getmedia.asp?media_id=52








Sunday, 20 October 2013

Wis-Dumb Teeth

Wisdom Teeth.

This seems to be one of the most common things "friends" ask about. Mostly in the form of "oh I have a friend of a friend who has been having problems from their wisdom teeth (I believe they call this "giving them jip" in local lingo) and they think they need them ripping out (another of my favourite expressions) but they're really scared so wanted me to ask you about it"

My usual response is, "let me see" to which they look around as if this friend of a friend has magically appeared, realise I have cottoned onto their game, and promptly show me. 99% of the time I can't see a thing (those lights and mirrors on sticks have their uses from time to time) and generally nod in agreement that they need to come out. Perhaps in future I shall direct them to this blog post.

What are they?

God bless NHS Choices.

"The wisdom teeth grow at the back of your gums and are the last teeth to come through. Most people have four wisdom teeth, one in each corner."

I would add that they are not always the last teeth to come through. So stick that in your pipe and smoke it nhs.uk. (Of course I do not in any way promote smoking and you will perhaps realise this in my next blog post).

Some people have no wisdom teeth, some have up to 4. It is likely in most people that 4 wisdom teeth will have formed but just not "come through". 

Dental Glossary:

Wisdom teeth are also referred to as "8's" as they are the 8th tooth along from the mid line. They can also be called 3rd molars. 

See the particularly helpful picture below, the man is even so kind as to point to said tooth. I have also rather patronisingly added numbers to the teeth. 






We refer to teeth "coming through" as erupting. So unerupted, means the tooth/teeth are not yet in the mouth. That is to say, they are lying somewhere under the gums. Partially erupted means the tooth is just poking through and usually covered by a flap of gum, and erupted means that the tooth is fully through in the mouth and we are able to see all of the top part of the tooth (the crown)

Here are another slightly condescending picture to explain:



I will explain partially erupted teeth and problems associated with them a little bit later on. 

It was in fact very difficult for me to find a picture of an "unerupted" wisdom tooth as they are all labelled "impacted" and there is a certain amount of confusion between the 2 terms even within the dental world. I used the incorrect nomenclature the other day at work and received a telling off so thus am bypassing the damage it caused to my perfectionist nature by writing it in this blog post as if its a mistake everyone makes. 

Unerupted means as above, that the tooth simply has not erupted, i.e. has not come through into the mouth. This can be for several reasons. As a child, when you lose a baby tooth and then there is a period of time before the adult teeth come through, this is usually because they are lying under the gum waiting for the appropriate time to come through which is most likely when your parents need to travel in a car with you for several hours, or board a plane, or sleep. This can occur with wisdom teeth. 

Sadly, because we are generally evolving (although some human beings seen at the Dental Hospital lead me to rethink the idea that this scientific process is ongoing in our society) to have smaller jaws, we mostly don't have room for wisdom teeth. Therefore they often struggle to come through, or erupt, normally. They may be tilted, lie sideways, or simply be wedged in against the next door tooth. This is when they are termed impacted. The tooth can be completely under the gumline – so you cannot see any of it, or it may have managed to poke through the gum slightly but then realise it’s stuck and cannot erupt any further (a bit like when you stick your head through a gap in the railings only to find you can’t then get out)
It is worth noting that is impossible to know which case you have – unerupted or impacted wisdom teeth - unless you take an x ray. Similarly, a tooth can simply be partially erupted because it is just too lazy to make a proper effort to erupt, or it can be because it is impacted and cannot move any more.

When it all goes wrong

When teeth are impacted the future can progress in a number of separate, or in fact a combination of, ways:

1) The teeth never attempt to come through because it’s just not worth their time or energy trying to push their way past an unmoveable blockage i.e. jaw bone, the adjacent tooth. In this situation the impacted wisdom tooth just stays where it is below the bone and you experience no problems at all.
2) The wisdom teeth cannot erupt for the reasons explained above, but instead remain positioned very very close to the 2nd molars (the number 7 teeth). For this explanation I require you to “suspend disbelief” (that English A level didn’t all go to waste) and imagine being on the Tube, or a nice ram-packed bus in rush hour. Picture the overweight sweaty man that you are just about managing to keep a safe distance from. Now imagine that it is no longer possible to maintain the space between you and his sweaty armpit and the two of you become wedged together.  This is a similar sort of thing to when wisdom teeth cannot erupt. You would of course be fine for a while, despite feeling a deep feeling of mortification, however say if you had to stay like that for months or years on end. Eventually things are going to get, shall we say, stagnant. In this way, going back to what I was meant to be discussing rather than my nightmare commute to work, it is not necessarily the wisdom tooth itself (in today’s production played by the sweaty man) that suffers from damage, but the adjacent tooth.
This can occur in a number of ways,
  •  If the tooth has managed to come slightly through the gum, as shown below, then it becomes almost impossible to clean around the back surface of the adjacent tooth, and so you can develop tooth decay in the second molar




Here is the same thing shown on an x ray -  which is often the only way we can detect a problem going on due to the close proximity of the molar teeth and our tooth worker abilities being limited to human only skills (although some like to believe otherwise).



  •  If the tooth is completely impacted i.e. it has not come through the gum/erupted into the mouth at all, the most common problem is that the wisdom tooth causes resorption of the second molar. (which is where the tooth or more importantly the tooth of the tooth, is eaten away, much like in those awful horror films where the busty blonde one gets attacked by some sort of flesh-eating bug – whilst I may add, her make-up and hair stays in pristine condition).


Apologies for the unclear quality of this x ray – it turns out that there is pretty much no visual evidence of this “resorption” being caused by wisdom teeth despite seeing it at the hospital on a weekly basis. The x ray shows a typical appearance of a second molar suffering from this resorption. Of course the wisdom tooth has been removed at this point because it was causing said resorption.











Partially erupted teeth

Whilst the above circumstances of decay or resorption due to wisdom teeth happen on a fairly regular basis, the most common problem with said intelligence-increasing teeth is something called pericoronitis. I have decided to give my good friends at nhs.net a break and have (perhaps blasphemously) borrowed this definition from medicinenet.com

Pericoronitis is a dental disorder in which the gum tissue around the (3rd) molar teeth becomes swollen and infected” To break the word down:
  • “peri” means “around"
  • The “coron” bit is a shortened version of coronal(ly) which refers to the crown of the tooth (the top bit that you see above the gum)
  • “itis” means inflammation/swelling (which is a good common bit of information, anything with “itis” after it means inflammation or swelling e.g. sinusitis, bronchitis)


So the word pericoronitis means, inflammation or swelling around the crown of a tooth. This therefore can occur with teeth other than 8’s – for example when children are teething, however it tends to occur most with wisdom teeth because they are so hard to get at anyway.

For pericoronitis to occur there has to be a certain set of circumstances:

  1. Your wisdom tooth should be PARTIALLY erupted. If the tooth is in its final position in the mouth i.e. has come through fully, then you cannot get pericoronitis and any problems or symptoms you are experiencing will be due to something else.
  2. For the reason above, the tooth will therefore be covered by a flap of gum
  3. Due to the flap of gum, it becomes very difficult to clean around the wisdom tooth effectively. It’s a bit like trying to hoover under the sofa. It’s doable but it takes effort.


        Here is a picture.






















How you know you have it.

Your dentist will be able to tell you immediately but the signs and symptoms of periocoronitis are:
      1)    Pain from around the wisdom tooth – it can be upper or lower
a.    You will often be able to feel with your tongue that there is a flap of gum over the tooth and that pressing on this triggers the pain or feels sore
      2)    You may feel like you have pain in the jaw particularly if you try to stretch wide for example when yawning
      3)    Bad breath. I don’t mean morning breath I mean actual people-walk-out-the-room-when-you-come-in bad.
      4)    Accompanying the bad breath is often a foul taste
      5)    Sometimes you can also get swollen glands (because they are reacting to the infection/inflammation) or a generally swelling around the area of the wisdom tooth for example a lower left wisdom tooth with pericoronitis may present with a swelling of the lower left part of the face if it is left untreated

How to deal with it

Ideally, you should go and see your local toothworker as a lot of the above symptoms can also be caused by a lot of other things from the mundane tooth decay to something more sinister. However, if they are fully booked (i.e. have a rep coming at 12pm and they’re bringing free lunch so all emergency slots are cancelled) or if you cannot get to a dentist then there are a number of things that you can try first to relieve the pain. If these work then it will save you a visit to the dentist and the accompanying cost and time etc.
Having a partially erupted wisdom tooth alone will not lead to pericoronitis. There has to be the build-up of plaque under the flap of gum. Unfortunately this does not spare even those of us with a toothbrushing addiction or the possession of the “they should know better” degree. I had a nasty bout of it last week. Sadly you don’t realise you’re not cleaning effectively enough until it hits you.

Therefore, the action plan is as follows:
     1.    Clean the hell out of the area. (Pardon my French). Get your toothbrush round there, but more importantly you need to get under the flap of gum (which just for completeness is called the operculum).The best way to do this is with either a single tufted toothbrush – you may have one lying around, if not they are readily available to purchase from supermarkets or chemists – or if you cannot get out to get one, a cotton bud will do a good job

 
2.    Use chlorhexidine mouthwash. This is most commonly called “Corsodyl” mouthwash, because after university we tend to lose all concept of chemistry and medicine and just call everything by its brand name.
a.    Use this as a rinse whenever you can be bothered, but at least after eating. As a side note, do not do this for more than a week. This is for several reasons, the first being that if there is no improvement after a few days then it is unlikely using a mouthwash for a week is going to help. Also, chlorhexidine causes staining of the teeth if used continuously for longer than 7 day periods. This staining is easily removed via a scale and polish but it is best to avoid it if possible.
b.    It is also very helpful to dip the aforementioned single tufted brush or cotton bud in some chlorhexidine prior to cleaning under the gum flap

     3.    If this does not improve the situation then you really do need to go to your dentist. They will wash out under the gum more effectively than you can manage at home, and if deemed necessary i.e. if you have swollen glands, severe pain, pain that hasn’t resided, any difficulties opening or closing the mouth, then they can prescribe you some antibiotics. Generally we will give a drug called Metronidazole. As a prior warning, if you’re planning to go to the dentist on a Friday and then drink away your sorrows at the weekend, think again. Metronidazole blocks the production of a certain chemical/enzyme required for breaking down alcohol. Therefore should you choose to indulge in an alcoholic beverage or 2, you will be violently ill. I don’t mean standard-end-of-a-night-out ill, or even Freshers-week ill, I mean wanting to murder-the-person-who-discovered-alcohol-I-promise-I’ll-never-drink-again sick.

     This nicely leads into the wondrous and very much mistaken taking out of wisdom teeth. Sadly one bout of pericoronitis is not an adequate reason for extracting wisdom teeth. Nor is “well they just don’t do anything useful do they?”. In my next post I will go into the reasons for and against extracting 3rd molars/8’s/wisdom teeth, as well as the process itself and a few pointers to follow as I feel I have waffled on quite enough for one sitting.
     
     As always questions are more than welcome, as are corrections of blatant mistakes. General rudeness however will result in an internet-transmitted slap. 

    Bye for now!!



Where I “borrowed” info from

http://www.nhs.uk/Conditions/Wisdom-tooth-removal/Pages/Introduction.aspx
http://www.drvenmar.com/Impacted_Teeth
http://www.drjohnschmitz.com/images/wisdomTeeth_adjacent.jpg
http://www.thenextdds.com/uploadedImages/The_Next_DDS/Clinical_Images/02b%20Laskin.jpg
http://www.medicinenet.com/pericoronitis/article.htm
http://www.juniordentist.com/wp-content/uploads/2012/09/pericoronitis-pericoronal-pouch-or-operculum1.gif
http://blog.dentist.net/wp-content/uploads/2011/12/tepe-compact-tuft-toothbrush.jpg