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Tore L. Hansson

~ Temporomandibular joint dysfunction or craniomandibular disorders from a clinical and practical point of view, focusing on TMJ condylar asymmetry when present.

Tore L. Hansson

Category Archives: Retruded Position of the Mandible

Occlusal Adjustment at a TMJ Condylar Asymmetry?

17 Tuesday Mar 2015

Posted by torelhansson in Condylar asymmetry, dentistry, Function & dysfunction of the stomatognathic system, Mandibular position, Occlusal adjustment, Occlusion, Prosthodontics, Retruded Position of the Mandible, Temporomandibular joint (a)symmetry, Treatment planning, Uncategorized

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Asymmetry, Centric relation, condylar asymmetry recognition, Dental treatment, Dentistry, Occlusal adjustment, Occlusion, Preprosthetic occlusal adjustment, Retruded Position of the Mandible, TMJ rehabilitation, Treatment planning

Be careful! The tooth contacts which seem to be occlusal interferences at the first sight when the conventional retruded contact position of the mandible is being executed may not be disturbing tooth contacts at all. If they are located on the higher condyle side they may denote the vertical dimension of the inter maxillary relationship and should in my opinion not be removed. Only precontacts on the shorter condyle side are to be looked upon as true interferences and can be removed to such an extent that tooth contacts are established on the higher condyle side.

With the risk of repeating myself I  do want to advise the clinician to build up the occlusion on the shorter condyle side instead of adjusting the teeth through occlusal adjustment on the higher condyle side.In this way we will secure a correct vertical dimension between the two jaws in occlusion and thereby rescue the patient from a too low vertical dimension of the occlusion after completed dental work often jeopardising the function the temporomandibular joints.

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TMJ Condylar Asymmetry

21 Saturday Feb 2015

Posted by torelhansson in Asymmetry Index TMJ, Bruxism, Condylar asymmetry, dentistry, Function & dysfunction of the stomatognathic system, Mandibular position, Orthodontics, Prosthodontics, Retruded Position of the Mandible, Temporomandibular joint (a)symmetry, Temporomandibular Joint Disk Displacement, Uncategorized

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Arthrogeneous origin of TMJ pain, Asymmetry, Asymmetry Index, Centric relation, condylar asymmetry recognition, Dentistry, Oral rehabilitation, Oral Stability, Orthodontics, Retruded Position of the Mandible, Temporomandibular joint diagnostics, Temporomandibular joint disorder, TMJ rehabilitation, Treatment planning

when present,is a must to consider, in any dental rehabilitation. I dare to have this opinion after more than three decades of experience in treating ” asymmetrical ” patients shared with several successful colleagues. Although I repeat my opinion   it seems relevant as we on a regular basis are exposed to excellent crowns, bridges,supra constructions on implants and even completed orthodontics and yet a not satisfied patient.The chosen mandibular position for the rehabilitation in the majority of these patients has not been correct.

Results of recent research performed in different countries indicate that the mechanics of the temporomandibular joint is essential in order to maintain a pain free and functioning stomatognathic system (Quintessence International Symposium, Scottsdale,Arizona February 6-7, 2015). Overloading of the joint seems  not only to jeopardize the intraarticular structures of the joint resulting in anything from internal derangement to osteoarthritis but also to be the trigger for masticatory muscle pain.

At a vertical temporomandibular joint condylar asymmetry the loading of the two joints is in danger as the vertical dimensions of the two condyles are not equal. Therefor the vertical dimensions of the two temporomandibular joint condyles need to be analyzed before any treatment is initiated. It is of utmost importance to determine the highest condyle as at an asymmetry  this condyle has to be the guide for the mandibular movement of  rotation(the Retruded Position of the Mandible)in which the rehabilitation is going to be executed.

Additionally,in patients with functional facial pain it sometimes might be difficult to clinically manipulate the mandible into the correct position for rehabilitation. At such occasions the result of the vertical condylar analysis in the panoramic X-ray easily can be transferred into the Maaxloc device by Dentatus, in which the index for the mandibular position of the planned rehabilitation is made.

TMD 2015, Condylar Asymmetry?

10 Tuesday Feb 2015

Posted by torelhansson in Arthrogeneous origin of pain, Asymmetry Index TMJ, Bruxism, Condylar asymmetry, Function & dysfunction of the stomatognathic system, Functional pain, Mandibular position, Retruded Position of the Mandible, Temporomandibular Joint Clicking and Popping, Temporomandibular Joint Disk Displacement, Temporomandibular Joint Sounds, Treatment planning, Uncategorized

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Arthrogeneous origin of TMJ pain, Asymmetry, Asymmetry Index, Bruxism, condylar asymmetry recognition, Dentistry, Occlusal device, Retruded Position of the Mandible, Temporomandibular joint diagnostics, Temporomandibular joint disorder, Temporomandibular joint pain, TMJ rehabilitation, Treatment planning

Reflecting back on the interesting information given by eighteen well known international speakers at the Quintessence International Symposium on TMD & FACIAL PAIN and HEADACHE, Bridging the Gap Between Current Research and Clinical Practice in Scottsdale Arizona ( February 6-7,2015, Co-Chaired by Drs Daniel M.Laskin and Charles S.Greene ) I once again would like to stress the importance to recognize a temporomandibular joint condylar asymmetry when present. Several speakers stressed the overloaded temporomandibular joint as the cause of TMD and advised to pay less attention  to the masticatory muscles initially at  the examination of TMD pain. Lack of synovial liquid and mini ruptures or even nano ruptures of the joint tissues are to be looked upon as causes for cartilage degeneration with osteoarthritis / osteoarthrosis as the end result.

It is my opinion that in combination with bruxism a temporomandibular joint condylar asymmetry needs to be acknowledged and addressed. The shorter condyle side joint is in its morphology unstable and easily develops internal derangement of its articulating parts.  The well known phenomenon of disk displacement is thereby a fact and the first step in joint break down with the diagnosis Arthritis microtraumatica art.temp.mand. In this perspective occlusion becomes extremely important . The shorter condyle side joint needs to be supported with the correct vertical dimension of occlusion. What is missing in vertical dimension inside that joint needs to be compensated for at the level of the teeth of the ipsilateral side. In my mind this is the only possibility to create a stable occlusion with the maintenance of improved joint function after the initially reversible approach with an orthotic device.

Finally a statement/question that might need some thoughts: How much longer are we as a profession going to talk about occlusion without considering the vertical dimension of the two temporomandibular joints!?

Tinnitus and TMJ condylar asymmetry

06 Friday Jun 2014

Posted by torelhansson in Condylar asymmetry, Mandibular position, Orthopantomogram OPG, Retruded Position of the Mandible, Reversible treatment, Uncategorized

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condylar asymmetry recognition, Occlusal splint, Oral rehabilitation, Oral Stability, Retruded Position of the Mandible, Tinnitus

It seems, as if patients with tinnitus show a large lateral deviation of the mandible between the retruded position of the mandible and the intercuspal position, there might be a chance to influence the bothersome sound. A panoramic X-ray easily confirms or rejects the presence of a vertical temporomandibular joint condylar asymmetry. At an asymmety the lateral deviation of the mandible mostly occurs in the direction towards the “shorter” condyle side with that side condyle being forced upwards and backwards in the intercuspal position.
A stabilization splint fabricated in the correct mandibular position i.e. when the position is guided by the “higher” condyle and thereby making the splint thicker on the “shorter” condyle side and thus compensating for what is missing in vertical condylar dimension might be one solution to try. The splint is to be worn as much as possible. An immediate response is also most often not to be expected.
Thinking back of many patients my experience has been that many patients do not immediately feel a difference regarding their tinnitus. However , faithfully wearing the splint for a couple of weeks to months many patients have reported definitive relief. If so, the permanent solution of their problem may be to establish an oral stability via additional dentistry.

Migraine or ?

19 Monday May 2014

Posted by torelhansson in Abused protrusion, Bruxism, dentistry, Function & dysfunction of the stomatognathic system, Functional pain, Mandibular position, Myogeneous origin of pain, Retruded Position of the Mandible, Reversible treatment, Tension headache, tooth clenching, Uncategorized

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Bruxism, Dentistry, Facial pain, Myogeneous origin of TMJ pain, Occlusal device, Occlusal splint, Retruded Position of the Mandible, Reversible treatment, Tension headache

Although the specific diagnosis of migraine is defined as a chronic neurological disorder characterized by recurrent moderate to severe headaches often in association with a number of autonomic nervous system symptoms it is often by our dental patients used as the general term for facial pain with often also no response to the prescribed medication. This experience I share with many colleagues and yet I have to tell you about the 36 years old man, who was referred for chronic left side facial pain he had suffered for 18 years, half of his life. He had visited many doctors and he had also been taking a lot of medication during the years.

The pain occurred almost every day and was described by the patient as migraine on the left side of his face covering the left side temple and cheek area. Mandibular movements were normal. A panoramic X-ray did not reveal any pathology and showed a temporomandibular joint condylar symmetry.Static pain could be provoked for closing of his mouth. During our conversation it became obvious that a left side latero-protrusion was an often used position for bruxism, which also could be confirmed by marked facets of his left side front teeth.

After information about the possibility to initially wear a stabilization splint part time ( during day time working hours )  in order to avoid his unilateral abuse of the left side mm temporalis and the deep portion of masseter he decided to try. The stabilization splint was designed around the retruded position of his mandible, inserted without any adjustments and checked after another 6 weeks. At that time the young man announced that he had been completely free from any facial pain since the day after the insertion of the splint. It had been worn during the day except for chewing. He also showed an oral stability without the splint in his mouth.

In conclusion: When the dental patient is telling about his or her migraine that is not responding to the, by the medical doctor, prescribed medication DO PERFORM A FUNCTIONAL EXAMINATION OF THE STOMATOGNATHIC SYSTEM. There might be a chance to help the patient and not only his or her teeth.

 

 

 

 

Indices for jaw registrations

29 Tuesday Apr 2014

Posted by torelhansson in Abused protrusion, Bruxism, dentistry, Mandibular position, Occlusal adjustment, Occlusion, Prosthodontics, Retruded Position of the Mandible, Reversible treatment, tooth clenching, tooth grinding, Uncategorized

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Bruxism, Centric relation, condylar asymmetry recognition, Dentistry, Mounting casts, Occlusal device, Occlusal splint, Occlusion, Retruded Position of the Mandible, TMJ rehabilitation

Sometimes it can be difficult to get a relaxed mandible in the process of jaw registration in the retruded position of the mandible in as well the diagnostic phase as in the steps of treatment. It happens mostly when the patient is a heavy bruxer or when the patient seems to defend him/herself against the pressure from the hands of the dentist in the clinical situation. A condylar asymmetry may add to the clinical difficulty in getting the registration right.
With the measurements of the vertical dimensions of the temporomandibular joint condyles and the Maaxloc device at hands the above mentioned problems can definitely be reduced.It is my opinion, which to a great extent I have achieved from the dental technicians, that the registrations made in the Maaxloc system get into a more retruded position of the mandible in comparison with the manually taken clinical indices which often are protruded.This conclusion is based upon several years of cooperation with Ines Selimanovic T.I.C. laboratory, Malmoe ,Sweden, an experienced dental technician, with whom I have made comparisons of by me taken clinical indices and by her made registrations in the Maaxloc device.
In conc;usion: To avoid unnecessary and time consuming adjustments despite quality of the dental work in the ” difficult mouth “it might be worth while to become critical to the manually taken clinical registration and consider the advantage of the Maaxloc device.

Mounting casts

04 Tuesday Mar 2014

Posted by torelhansson in Asymmetry Index TMJ, Condylar asymmetry, dentistry, Occlusal adjustment, Occlusion, Prosthodontics, Retruded Position of the Mandible, Temporomandibular joint (a)symmetry, Tension headache, Treatment planning, Uncategorized

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Asymmetry, Asymmetry Index, Centric relation, condylar asymmetry recognition, Dental laboratory work, Dentistry, Mounting casts, Occlusal adjustment, Occlusal device, Occlusal splint, Occlusion, Oral rehabilitation, Oral Stability, TMJ rehabilitation, Treatment planning

The other day I had to check the mounting of the casts of the upper and lower jaws of a patient with a condylar asymmetry of about 6%. The reason for my visit to the dental laboratory was that the right side lower four units bridge had been redone and several times before that adjusted. And yet the patient found it too low i.e. her teeth of her right side did not contact in occlusion unless she  forced her mandible to the right.

During the visit at the laboratory it became once again obvious to me from the discussions with two well experienced dental technicians that very often the indices to be used in mounting the casts cannot be used. The indices are perforated and mostly show slides in the material used indicating that the mandible of the patient has not been stable at the time of index registration.  Therefore the technicians try to analyze different facets of the occlusal surfaces of the casts. They try to fake the movements of the patients mouth that have created them and thereafter, still manually, they fix the casts in the position which seems to  be the starting point for the suspected movement.This position usually is looked upon as the intercuspal position and will be used for the subsequent mounting of the casts.

At a condylar asymmetry it is therefore easy to understand that with the above described mounting of the casts the crowns or bridges of the ” shorter condyle ” side will be too low. Clinically oral stability will be lacking despite the insertion of the prosthodontic work. Very often tooth contacts of the ” higher condyle  ” side will be looked upon as occlusal interferences and removed in an ” adjustment “.This actually results in a decrease of the vertical dimension and a not one hundred percentage satisfied patient.

The problem and frustration can easily be avoided if the vertical condylar asymmetry is transferred into the Maaxloc instrument. A registration at the clinic or at the laboratory is made  and used in mounting the casts with the result that mostly the prosthodontic work can be inserted  without any adjustment at its delivery.

Asymmetry Index ( AI ) for temporomandibular joint Condylar Asymmetry

26 Wednesday Feb 2014

Posted by torelhansson in Arthrogeneous origin of pain, Asymmetry Index TMJ, Condylar asymmetry, dentistry, Function & dysfunction of the stomatognathic system, Functional pain, Mandibular position, Myogeneous origin of pain, Occlusion, Prosthodontics, Retruded Position of the Mandible, Temporomandibular joint (a)symmetry, Tension headache, Treatment planning, Uncategorized

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Arthrogeneous origin of TMJ pain, Asymmetry, Asymmetry Index, Centric relation, condylar asymmetry recognition, Dentistry, Myogeneous origin of TMJ pain, Occlusal adjustment, Oral rehabilitation, Oral Stability, Retruded Position of the Mandible, Reversible treatment, Temporomandibular joint, Temporomandibular joint diagnostics, Tension headache, TMJ rehabilitation

For more than twenty years I have been working on a regular basis with Dr Ugo Gambardella, Medical Space in Seriate, Italy. In 1993 we founded the T.A.C. Seriate clinic, ( Team Approach to Craniomandibular disorders ) in order to optimize the diagnostics and treatment of patients suffering facial pain due to dysfunction of the stomatognathic system. Dr Gambardella was already then experienced in prosthodontics as well as in implantology.
Already at the start it became obvious to us that a large portion of the mostly referred patients showed a condylar asymmetry and a lack of oral stability. Initially our treatment aimed at a normalization of the stomatognathic system via a stabilization splint in its design compensating for the condylar asymmetry, when present, and providing at least a temporary oral stability. After 6 – 12 months several patients wanted to have permanent oral stability, which then was achieved through mostly prosthodontics , sometimes in combination with preprosthetic orthodontics.
Some years ago and then more than 5 years after completed treatment the patients were invited to have their situation evaluated and to tell how they felt and how they were functioning after treatment. The equivalent clinical examination of their stomatognathic system was executed by an Italian speaking colleague, who did not know what kind of treatment the patients had got or been exposed to. The teeth depicted in the panoramic overview X-rays were covered i.e. made not visible to the examiner while the two temporomandibular joints were shown.
The condylar asymmetry was analyzed and for each patient an Asymmetry Index ( AI ) was calculated according to the following formula: ( R – L : R + L ) x 100 i.e. the right side condylar height minus the left side condylar height divided by the sum of the right and left side condylar heights multiplied by 100. Thus an asymmetry index was expressed in percentage for each patient.
The results of the subsequent analysis showed that after more than five years with permanent oral stability no patient any longer was found with a mainly arthrogeneous origin of pain. Myogeneous origin of pain was also frequently eliminated or markedly reduced. All patients showed an increase of maximum mouth opening.
The patients were grouped and analyzed according to the asymmetry index ( AI ) . It can be concluded from the results that patients with an AI > 3 % in general benefit from reversible treatment. Patients with an AI in the range between 3 % and 10 % may do well with just a temporary oral stability in form of a stabilization splint i.e. the splint can be worn part time, which for most patients means during sleep. As the participating patients with an AI > 10 % definitely benefitted the most and also felt subjectively completely different, mostly totally pain free after the treatment it is our opinion, that when you find a condylar asymmetry > 10 % in a patient with a diagnosed facial pain, you can comfortably suggest permanent occlusal treatment after the initially reversible period in the correct mandibular position guided by the higher temporomandibular joint condyle. The permanent treatment then executed in the same mandibular position will provide oral stability.

TMJ Clicking Sound

10 Monday Feb 2014

Posted by torelhansson in Arthrogeneous origin of pain, Bruxism, Condylar asymmetry, dentistry, Function & dysfunction of the stomatognathic system, Functional pain, Mandibular position, Myogeneous origin of pain, Occlusion, Retruded Position of the Mandible, Reversible treatment, Temporomandibular joint (a)symmetry, Temporomandibular Joint Sounds, Uncategorized

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Arthrogeneous origin of TMJ pain, Asymmetry, Centric relation, condylar asymmetry recognition, Dentistry, Myogeneous origin of TMJ pain, Retruded Position of the Mandible, Temporomandibular joint, Temporomandibular Joint Clicking, Temporomandibular joint diagnostics, Temporomandibular Joint Disk Displacement, Temporomandibular joint pain, Temporomandibular Joint Sounds

TMJ clicking sound has been reported, discussed, investigated and even visualized in thousands of articles during the past thirty and more years with a peak of interest in 1980-s. Common knowledge is that the sound is either due to deviations in form of the articulating surfaces of the condyle and / or the temporal component ( increase of cartilage in specifically overloaded areas of the articulating surface ) or to a displacement of the disk. Disk displacement often comes and goes and it is therefore not a surprise that it is more common among patients with a mainly myogeneous origin of pain. Since the result of comprehensive epidemiological  studies in the 1970-s it is also common knowledge that  the phenomena occurs in about 40% of the adult population.

Hopefully in not contributing to the too often clinically existing confusion of how to handle the sound I would rather suggest the following: Check the panoramic x-ray i.e. check specifically the temporomandibular joint condylar heights before you take any further steps in your attempt to help your patient!

Most probably you will find a shorter condyle of the joint with the registered clicking sound. Try to guide a mandibular rotation movement around the higher condyle and most likely the clicking sound disappears or at least gets a reduced  magnitude, when it is due to a latent disk displacement. If there is no discomfort or pain to be registered there is no real indication for intervention. However, if discomfort or a mainly myogeneous origin of pain is reported by the patient there is a need for an initially reversible treatment in form of a stabilization splint that compensates for the difference in vertical dimensions between the two condyles. The splint is to be worn part time . The patient is supposed to find a seemingly fast relief.  When the clicking sound is found in combination with a mainly arthrogeneous origin of pain the splint needs to be worn as much as possible for at least 6 months before additional permanent treatment is considered.

In addition , even if the clicking sound is due to a deviation in form ( of the condyle and / or of the temporal component )  the clicking sound may over time get reduced as a smoothening out of the articulating surfaces can be expected at a consequent long term  wearing of the correctly designed splint. Therefore I once again would suggest the use of the Maaxloc instrument in producing the index  which will be used in mounting the models into the articulator before the construction of the stabilization splint. The splint absolutely must compensate for the registered difference in vertical condylar height between the two joints in providing a symmetrical oral stability in order to eliminate the  painful and bothersome  tmj clicking.

Cutting Temporomandibular Joints

29 Wednesday Jan 2014

Posted by torelhansson in Arthrogeneous origin of pain, Condylar asymmetry, dentistry, Function & dysfunction of the stomatognathic system, Functional pain, Implantology, Mandibular position, Occlusal adjustment, Occlusion, Orthodontics, Orthopantomogram OPG, Prosthodontics, Retruded Position of the Mandible, Temporomandibular joint (a)symmetry, TMJ radiology, Treatment planning, Uncategorized

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Asymmetry, condylar asymmetry recognition, Dentistry, Implantology, Occlusion, Orthodontics, Preprosthetic occlusal adjustment, Prosthodontics, Radiography, Temporomandibular joint, Temporomandibular joint disorder, Temporomandibular joint pain, Treatment planning

occurs in surgery. Thank God it does not happen too often, as responsible, well trained and experienced oral / maxillofacial surgeons are utmost cautious. They know it is involved with major draw backs. However, under certain circumstances and with the correct indications it is  necessary. I do not mind that at all, but what I do mind is all the cutting of temporomandibular joints in the panoramic x-rays we are exposed to in the literature and thus unconsciously gives us the message that the joints are not so very important.

It does not matter whether it is in a professional journal of prosthodontics, orthodontics, implantology, periodontics or even in a presentation at a congress it could be estimated that 8-9 out of 10 panoramic x-ray photos presented do not show the entire picture of the two temporomandibular joint condyles. The majority of condyles are cut totally  or at least partially while all the teeth are nicely depicted and aligned in the perfect occlusal plane  often before as well as always after treatment.  Is a vertical condylar asymmetry present in such a patient most likely the teeth are not aligned in the shown or anticipated correct occlusal plane. With a high probability the smile of that patient is tilted which is observed in the clinical situation and which often also might be the reason for the complaint of  the not satisfied patient.

In rehabilitation priority is supposed to be given to the whole stomatognathic system and not only to one third of it. As the other two thirds of the system ( the masticatory muscles and the two temporomandibular joints ) are dependent on the teeth it is my advice that the teeth must be aligned in such a way that they vertically compensate for what is missing in the vertical dimension of the shorter condyle when present. Addressing the vertical condylar asymmetry, when present, is of utmost importance and  in my opinion it should be done already at the time of treatment planning regardless specialty of the therapist. To incorporate an index, preferably via Maaxloc, between the models already at the initial analysis of the ” study ” models instead of just manually having the models to occlude will definitely contribute to a bigger certainty in reaching the goal of treatment. It makes the whole planning easier and it decreases the risk of unnecessary difficulties during treatment. In not accepting cut temporomandibular joint condyles in the panoramic x-ray and instead  only accepting  the picture when it is  complete i.e. picturing  both the temporomandibular joint condyles we most probably will be  expanding our clinical success and consequently patient satisfaction.

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torelhansson on House of Gnathology part …
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