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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

Tag Archives: Centric relation

Splint (Oral Orthosis) Adjustment, A Necessity?

05 Tuesday Jan 2016

Posted by torelhansson in Bruxism, Condylar asymmetry, dentistry, Function & dysfunction of the stomatognathic system, Functional pain, Mandibular position, Uncategorized

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Centric relation, condylar asymmetry recognition, Dentistry, Occlusal device, Occlusal splint, Retruded Position of the Mandible, Reversible treatment, TMJ rehabilitation

Absolutely not! In my opinion it is the initial sign of a pure failure in the first phase of the reversible treatment i.e. when the registration of the mandibular position, in which the device is going to be made, is taken.At the presence of a temporomandibular joint condylar asymmetry the higher condyle must be the guide in the registration. If this is not applied the splint will not provide bilateral oral stability and disturbing contacts will be the result.The never-ending trips to the dentist is being started.
A correctly made splint does not need any adjustments. It is a matter of how and when to wear the splint that will give the expected success.
There is one thing I cannot avoid to comment due to its absurdness. It was told in a discussion by a specialist in the field of facial pain that every splint needs to be adjusted regardless its fitness to the opposing jaw. Splint adjustment should show the patient the engagement and the involvment by the dentist. In other words, How stupid is that?

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Splint adjustments

22 Tuesday Sep 2015

Posted by torelhansson in Arthrogeneous origin of pain, Asymmetry Index TMJ, Condylar asymmetry, dentistry, Function & dysfunction of the stomatognathic system, Uncategorized

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Asymmetry, Centric relation, Dentistry, Myogeneous origin of TMJ pain, Occlusal device, Occlusal splint, Oral Stability, Retruded Position of the Mandible

do not seem to be too efficient as once the first one has been performed the next one mostly come very soon thereafter often requested by the patient. Too many dentists fall into the trap and after three to four visits the splint does not look the way it originally was supposed to look and/or function.

In my opinion, when the splint is fabricated in the correct mandibular position, it does not need any adjustments. It only needs to be worn during that time the patient is bruxing. Some patients need to wear the splint during the day. Others need to use the splint during sleep. If the patient belongs in the category arthrogenous origin of pain the splint has to be worn full time except for chewing.

One reason for the initially not comfortable or not efficient occlusal device is most probably that it is made in the wrong mandibular position. One major cause is that an existing temporomandibular joint condylar vertical asymmetry ,when present, has not been taken into account at the design of the splint.

It is my experience and sincere advice that no single occlusal device or splint should be made unless the temporomandibular joint condylar (a)symmetry. has been analysed and determined.

Common Core in Dentistry?

16 Thursday Jul 2015

Posted by torelhansson in Condylar asymmetry, dentistry, Uncategorized

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Centric relation, condylar asymmetry recognition, Dentistry, Occlusion, Oral rehabilitation, Oral Stability, Retruded Position of the Mandible, Treatment planning

Most likely it is the tooth. However, in 2015 that is neither good nor professional  enough. It is my opinion that it should be expanded to at least encompass the function of the whole masticatory system and to realise the importance of maintaining its bilateral uniqueness. In doing so the dentist, in the diagnostic phase as well as in the therapeutic phase, may enter into the dilemma of how to handle the treatment when the two temporomandibular joint condyles are not identical regarding their vertical dimensions.

In order to restore the occlusion and provide an oral stability with an optimal masticatory function the correct mandibular reference position needs to be found. At a temporomandibular joint condylar vertical asymmetry it may clinically be difficult to manually manage. The Maaxloc instrument by Dentatus should therefore be recommended. It assists the clinician in finding the mandibular position to be used in the rehabilitation, in guiding and directing the mandibular function around the higher and mostly normally developed temporomandibular joint condyle. Not considering a temporomandibular joint condylar vertical asymmetry, when present, is devastating  for the patient and the dentist.

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.

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.

House of Gnathology?

13 Monday Oct 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, Occlusal adjustment, Occlusion, Orthopantomogram OPG, Prosthodontics, Temporomandibular joint (a)symmetry, Temporomandibular Joint Disk Displacement, Tension headache, tooth clenching, tooth grinding, Treatment planning, Uncategorized

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

A week ago I had the pleasure to attend the XXVII International AIG (Associazione Italiana di Gnatologia) Congress in Torino, Italy. Twentyseven speakers from six countries each had about 30 minutes to present their thoughts about the relationship between occlusion and temporomandibular joint disorders. In general it could be concluded that a stable occlusion would improve the function of the stomatognathic system and thereby reduce the risk for developing or aggravating a temporomandibular joint disorder. It was also underlined in several lectures that gnathology is a team work and that occlusion is one tool in the treatment of a temporomandibular joint disorder.
It was interesting to note that the speakers in general agreed in finding occlusion an important factor in the treatment of a temporomandibular joint disorder, i.e. a complete contradiction to the conclusion of several hundreds of articles and studies proclaiming that when RDC/TMD are used in the evaluation of treatment outcome occlusion is not important and should not get priority or most often not even be considered in the treatment of a temporomandibular joint disorder.

RDC/TMD were discussed and by a great part of the participants even questioned in the final round table discussion of the congress. In my opinion and in agreement with many other clinicians RDC/TMD cannot and should not be used in the clinical situation in which a specific diagnosis is to be the sound base for the treatment. Reliable criteria like maximum mouth opening, mandibular movements, the difference between dynamic and static pain and even the difference between the vertical dimensions of the two temporomandibular joint condyles visible and measurable in a panoramic X-ray exist. Therefore my suggestion to the RDC/TMD supporters is: Next time you conduct a clinical study, why not incorporate the above mentioned criteria! I am pretty convinced that the results will be different regarding the eventual link between occlusion and the temporomandibular joint disorder.

Finally I would delete the ? from the title of this blog and agree with the suggestion from Dr.Eugenio Tanteri that a forum “House of Gnathology” might come to an agreement that a correctly designed and applied occlusion is important in providing  oral stability and thereby reduce the prevalence of temporomandibular joint disorders among our patients.

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

≈ 2 Comments

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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.

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  • House of Gnathology part II
  • Splint (Oral Orthosis) Adjustment, A Necessity?
  • Too many adjustments on the dental work?
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  • Splint adjustments

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  • House of Gnathology part II
  • Splint (Oral Orthosis) Adjustment, A Necessity?
  • Too many adjustments on the dental work?
  • Prefabricated occlusal devices,mouth guards or splints
  • Splint adjustments

Recent Comments

torelhansson on House of Gnathology part …
Paul C. Riley, DDS on House of Gnathology part …
torelhansson on Asymmetry Index ( AI ) for tem…
R on Asymmetry Index ( AI ) for tem…
marjan on TMJ Condylar Asymmetry

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Categories

  • Abused protrusion
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