Relationship between the unilateral TMJ osteoarthritis/osteoarthrosis, mandibular asymmetry and the EMG activity of the masticatory muscles: a retrospective study

Matsumoto, Ryusuke; Ioi, Hideki; Goto, Tazuko K.; Hara, Atsushi; Nakata, Satoshi; Nakasima, Akihiko; Counts, Amy L.

doi:10.1111/j.1365-2842.2009.02026.x

Cited by 32 publications

(31 citation statements)

References 20 publications

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“…The result showed the MD group and DD group had no difference but the AR group had a statistically significant difference (p<0.01). This upholds the connection between unilateral OA and facial asymmetry, keeping up with the earlier reports of Matsumoto et al 20) In animal research, the ablation of the articular disc decreases the ramus height, thus leading to a mandibular midline shift on the affected side. 29) These results suggest that unilateral TMJ OA may result in a shortened vertical between the mandibular asymmetry and TMD so to adopt proper diagnostic criteria for TMD and asymmetry itself.…”

Section: )supporting

confidence: 60%

“…However, the cause and effect relationship among TMJ OA, the masticatory muscle function, and the dentofacial morphology could not be elucidated. 20) It is still controversial whether asymmetry affects the occurrence of TMDs. It might be partly because, although age and gender is well known to affect the occurrence of TMDs, such factors were not properly controlled for analysis in most previous studies.…”

Section: Discussionmentioning

confidence: 99%

“…Although asymmetry functions as a debilitating factor for a stable orthopedic state, its effect is not fully independent, but is affected by the interaction with other contributing factors. 17) On the other hand, there should be various factors to promote asymmetrical growth in the growth phase, 20,[26][27][28] which might increase the risk for TMD as well as asymmetry. Thus, it can also be postulated that asymmetry might be just a result of the growth phase with such factors affecting the TMJ and growth rather than an actual causative factor of TMD.…”

Section: )mentioning

confidence: 99%

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Relationship between Mandibular Asymmetry and Temporomandibular Disorders

Noh¹,

Lee²

2014

Journal of Oral Medicine and Pain

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Purpose: This study was performed to investigate the relationship between temporomandibular disorders (TMDs) and the asymmetry of the mandibular height. Methods:We compared 100 randomly selected TMD patients diagnosed by the research diagnostic criteria for TMD (RDC/TMD) Axis I with 100 non-TMD control subjects matched with the TMD patients in age and gender. The mandibular heights were measured on an orthopantomogram and the asymmetry index (AI) was calculated as previously described. Results:The absolute AI value of 4.37% turned out to be the least cut-off value defining asymmetry, which showed a significant difference in asymmetry incidence (p<0.01) between the TMD and control groups. The risk of TMD increased in the asymmetry group by 4.57 (odds ratio). The incidence of asymmetry was not related to age and gender in both of the TMD and control groups. When dividing the TMD group according to the RDC/TMD Axis I diagnosis, neither the incidence of muscle disorder nor disk displacement was related to the incidence of asymmetry. However, a higher incidence of asymmetry was observed in the subjects classified into the arthrosis/arthritis groups (p<0.01). Conclusions:Although it does not imply a direct cause-and-effect relationship, asymmetry resulting in more than 4.37% difference between mandibular heights may increase the risk of TMD and correlates positively to the incidence of arthritic change in the temporomandibular joint of TMD patients. and articular disc displacement. 2,[14][15][16] On the other hand, some limitations have been raised over those observations as well. It was pointed out that the cause of TMD is multifactorial and the criteria for diagnosis is unclear. 17) To clarify the relationship between TMD and asymmetry, gender, age and the influence of other factors should be considered and the diagnostic criteria for TMD should be clear. 4)

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confidence: 60%

Section: Discussionmentioning

confidence: 99%

Section: )mentioning

confidence: 99%

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Relationship between Mandibular Asymmetry and Temporomandibular Disorders

Noh¹,

Lee²

2014

Journal of Oral Medicine and Pain

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“…However, TMJOA may differ from OA in knee or hip, which is closely related to aging, obesity, and overload (Herrero-Beaumont et al 2009). Overload of the TMJ, including severe malocclusion, skeletal jaw asymmetry, and muscle overuse, has been considered one of the main causes for TMJOA (Tanaka et al 2008;Matsumoto et al 2010;Krisjane et al 2012), but the majority of TMJOA is difficult to attribute to overload. Therefore, the causes of impaired condylar cartilage in the TMJ remain unclear.…”

Section: Introductionmentioning

confidence: 99%

Current Understanding of Pathogenesis and Treatment of TMJ Osteoarthritis

et al. 2015

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Osteoarthritis is a common disease that can cause severe pain and dysfunction in any joint, including the temporomandibular joint (TMJ). TMJ osteoarthritis (TMJOA) is an important subtype in the classification of temporomandibular disorders. TMJOA pathology is characterized by progressive cartilage degradation, subchondral bone remodeling, and chronic inflammation in the synovial tissue. However, the exact pathogenesis and process of TMJOA remain to be understood. An increasing number of studies have recently focused on inflammation and remodeling of subchondral bone during the early stage of TMJOA, which may elucidate the possible mechanism of initiation and progression of TMJOA. The treatment strategy for TMJOA aims at relieving pain, preventing the progression of cartilage and subchondral bone destruction, and restoring joint function. Conservative therapy with nonsteroidal anti-inflammatory drugs, splint, and physical therapy, such as low-energy laser and arthrocentesis, are the most common treatments for TMJOA. These therapies are effective in most cases in relieving the signs and symptoms, but their long-term therapeutic effect on the pathologic articular structure is unsatisfactory. A treatment that can reverse the damage of TMJOA remains unavailable to date. Treatments that prevent the progression of cartilage degradation and subchondral bone damage should be explored, and regeneration for the TMJ may provide the ideal long-term solution. This review summarizes the current understanding of mechanisms underlying the pathogenesis and treatment of TMJOA.

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“…6 Concurrently, temporomandibular disorders have been demonstrated to induce mandibular asymmetry. [7][8][9][10] A study conducted by Emshoff et al, 11 has shown that TMJ disc displacements without reduction and osteoarthrosis are important determinants of mandibular backward positioning. Disc displacement might induce skeletal changes in facial morphology.…”

Section: Introductionmentioning

confidence: 99%

Posteroanterior cephalometric changes in subjects with temporomandibular joint disorders

Almășan

Băciuţ²,

Hedeșiu³

et al. 2013

Dentomaxillofacial Radiology

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Objectives: The aim of the study was to establish the changes in posteroanterior cephalometric variables in subjects with temporomandibular joint disorders (TMDs). Methods: Posteroanterior cephalograms of 61 subjects (age range 16-36.6 years, standard deviation 4.88 years) were used to determine cephalometric differences. Subjects were classified according to the Research Diagnostic Criteria for Temporomandibular Joint Disorders into three groups: unilateral TMD, bilateral TMD and no TMD. 14 linear and angular measurements were assessed on the posteroanterior cephalogram. For assessing facial asymmetry, the asymmetry index for bilateral measurements was calculated between the right and the left side. In cases with unilateral TMD, the asymmetry index was calculated using the difference between the unaffected and affected side. The differences among multiple groups were analysed using the one-way analysis of variance test and Scheffé post hoc test. Results: 47 subjects were females (77%) and 14 were males (23%). 19 subjects had unilateral TMDs and 16 subjects had bilateral TMDs. The asymmetry index of the distance from the horizontal plane to the antegonion was higher in subjects with unilateral TMD than in patients with bilateral or no TMD (p , 0.05). Also, the asymmetry index of the distances from the vertical plane to the condyle (p 5 0.05), gonion (Go) (p 5 0.0004), antegonion (p 5 0.002) and chin (Ch) (p 5 0.02) was higher in subjects with unilateral TMDs. The asymmetry index of the O point-Go-Go9 and O point-Ch-Ch9 angles differed significantly in subjects with unilateral TMDs (p , 0.05). Conclusions: Unilateral TMDs are associated with changes in posteroanterior cephalometric measurements. The assessment of posteroanterior cephalometric variables could be used as a key factor for evaluating the presence of TMDs.

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Relationship between the unilateral TMJ osteoarthritis/osteoarthrosis, mandibular asymmetry and the EMG activity of the masticatory muscles: a retrospective study

Cited by 32 publications

References 20 publications

Relationship between Mandibular Asymmetry and Temporomandibular Disorders

Relationship between Mandibular Asymmetry and Temporomandibular Disorders

Current Understanding of Pathogenesis and Treatment of TMJ Osteoarthritis

Posteroanterior cephalometric changes in subjects with temporomandibular joint disorders

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