Biomechanics of the Temporomandibular Joint

Topics: Knee, Joint, Temporomandibular joint Pages: 9 (2638 words) Published: November 12, 2012
DISCOVERY!
Martin A. Taubman, Editor

E. Tanaka1* and J.H. Koolstra2
1Department

of Orthodontics and Dentofacial Orthopedics, The University of Tokushima Graduate School of Oral Sciences, 3-18-15 Kuramoto-cho, Tokushima 770-8504, Japan; and 2Department of Functional Anatomy, ACTA, Amsterdam, The Netherlands; *corresponding author, etanaka@ dent.tokushima-u.ac.jp J Dent Res 87(11):989-991, 2008

Biomechanics of the Temporomandibular Joint

INTRODUCTION
his article is in honor of the late professor Theo van Eijden, who passed away on February 28, 2007. During his career as chairman of the Department of Functional Anatomy at the Academic Centre for Dentistry Amsterdam, he was very productive in his contributions to our understanding of the biomechanics of the human masticatory system. First and foremost, however, he was a great inspiration for his fellow researchers, from both his own institute and beyond. Temporomandibular joint (TMJ) disorders were recognized in the early dental (Gysi, 1921) and medical (Costen, 1997 [reprinted from 1934]) literature as an individual source of facial pain. The function of this joint, however, was not regarded as important. For instance, initially, the TMJ was not considered to be a load-bearing joint. Also, the movement possibilities of the joint were poorly understood, as illustrated by a persistent belief in the concept of a more or less ‘predetermined’ instantaneous center of rotation (Grant, 1973). One of the major complicating factors in comprehension of the function of the TMJ is the presence of its disc, which, in certain circumstances, appears to be able to dislocate temporarily or permanently. In the latter case, this can lead to degeneration and may cause severe pain and/or masticatory dysfunction. The causes for such a disc displacement as well as its consequences are not yet understood. Treatment remedies for TMJ dysfunction include medication (for example, NSAIDs), conservative approaches (for example, splint therapy), and physical therapy. In addition, in end-stage disease, such as TMJ osteoarthrosis, surgery may be considered. This may range from disc removal to complete joint replacement. The decision for treatment modalities must be based on evaluation of the individual’s response to non-invasive management, his/her mandibular form and function, and the impact of the modality on the individual’s quality of life (Mercuri, 2006). Unfortunately, predictions about the latter must be based primarily on prior experience. Obtaining causal relationships is very difficult, because the joint cannot be reached easily, and there are few experimental methods that have been proven to be adequate for: (1) decreasing joint pain, (2) increasing

T

joint function, (3) preventing further joint damage, and (4) preventing disability and disease-related morbidity (Tanaka et al., 2008). If such information were available, it would enable dentists to manage patients with TMJ disorders correctly at earlier stages, such that the necessity for surgical treatment would decrease. In the field of orthopedics, a three-dimensional reconstruction system has already been developed as a powerful tool for diagnosis and treatment planning of bone fracture (Glitsch and Baumann, 1997; McLean et al., 2003). The latter, for instance, successfully developed a subject-specific threedimensional model of the lower extremity from an individual MRI and used it to predict neuromuscular control effects on three-dimensional knee joint loading during movements that can potentially cause injury to the anterior cruciate ligament in the knee. These investigators also demonstrated that this modeling was successful in simulating injuries caused by perturbed neuromuscular control, which can contribute to the prevention of damage to the locomotory system. The goal of TMJ research should be the development of a system to diagnose TMJ disorders and their etiology. This would include three-dimensional reconstruction...

References: Beek M, Koolstra JH, van Ruijven LJ, van Eijden TMGJ (2000). Threedimensional finite element analysis of the human temporomandibular joint disc. J Biomech 33:307-316. Brehnan K, Boyd RL, Laskin J, Gibbs CH, Mahan P (1981). Direct measurement of loads at the temporomandibular joint in Macaca arctoides. J Dent Res 60:1820-1824. Costen JB (1997). A syndrome of ear and sinus symptoms dependent upon disturbed function of the temporomandibular joint. Ann Otol Rhinol Laryngol 106:805-819 [reprint of 1934 article]. Glitsch U, Baumann W (1997). The three-dimensional determination of internal loads in the lower extremity. J Biomech 30:1123-1131. Grant PG (1973). Biomechanical significance of the instantaneous center of rotation: the human temporomandibular joint. J Biomech 6:109-113. Gysi A (1921). Studies on the leverage problem of the mandible. Dent Digest 27:74-84, 144-150, 203-208. Koolstra JH, van Eijden TMGJ (2007). Consequences of viscoelastic behavior in the human temporomandibular joint disc. J Dent Res 86:1198-1202. Koolstra JH, Tanaka E, van Eijden TMGJ (2007). Viscoelastic material model for the temporomandibular joint disc derived from dynamic shear tests or strain-relaxation tests. J Biomech 40:2330-2334. Korioth T, Romilly D, Hannam A (1992). Three-dimensional finite element analysis of the dentate human mandible. Am J Phys Anthropol 88:69-96. McLean SG, Su A, van den Bogert AJ (2003). Development and validation of a 3-D model to predict knee joint loading during dynamic movement. J Biomech Eng 125: 864-874. Mercuri LG (2006). Surgical management of TMJ arthritis. In: Temporomandibular disorders. An evidence-based approach to diagnosis and treatment. Laskin DM, Greene CS, Hylander WL, editors. Chicago: Quintessence, pp. 455-468. Mow VC, Kuei SC, Lai WM, Armstrong CG (1980). Biphasic creep and stress relaxation of articular cartilage in compression: theory and experiments. J Biomech Eng 102:73-84. Sibonga JD, Zhang M, Evans GL, Westerlind KC, Cavolina JM, Morey-Holton E, et al. (2000). Effects of spaceflight and simulated weightlessness on longitudinal bone growth. Bone 27:535-540. Soltz MA, Ateshian GA (1998). Experimental verification and theoretical prediction of cartilage interstitial fluid pressurization at an impermeable contact interface in confined compression. J Biomech 31:927-934. Stegenga B, DeBont LGM, Boering G (1989). Osteoarthrosis as the cause of craniomandibular pain and dysfunction: a unifying concept. J Oral Maxillofac Surg 47:249-256. Tanaka E, Tanne K, Sakuda M (1994). A three-dimensional finite element model of the mandible including the TMJ and its application to stress analysis in the TMJ during clenching. Med Eng Phys 16:316-322. Tanaka E, Detamore MS, Mercuri LG (2008). Degenerative disorders of the temporomandibular joint: etiology, diagnosis, and treatment. J Dent Res 87:296-307.
CONCLUSIONS
An understanding of the biomechanical environment in the TMJ as described in this essay is essential to the successful integration of management remedies for TMJ disorders. To develop an evidence-based approach to clinical management and treatment for TMJ disorders, we would like to be in full pursuit of TMJ biomechanics, including tissue engineering. Still, there are many challenges for this relatively new
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