Devices for the diagnosis and treatment of temporomandibular disorders. Part I: Introduction, scientific evidence, and jaw tracking

Mohl, Norman D.; McCall, W.D.; Lund, James P.; Plesh, Octavia

doi:10.1016/0022-3913(90)90106-m

Cited by 96 publications

(41 citation statements)

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“…The concept of a hinge axis may have been revived by the demonstration that rotary jaw movement near occlusion can be accomplished through manipulation on cadaverous material (Rees, 1954). This concept has survived in clinical practice, where, despite a lack of a scientific basis (Mohl et al, 1990;Lindauer et al, 1995), it has been applied successfully for a long period (Roth and Williams, 1996).…”

Section: (4) Final Remarksmentioning

confidence: 99%

Dynamics of the Human Masticatory System

Koolstra

2002

Critical Reviews in Oral Biology & Medicine

203

110

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ABSTRACT:In this review, the movement characteristics of the human masticatory system are discussed from a biomechanical perspective. The discussion is based upon the three fundamental laws of mechanics applied to the various anatomical structures that are part of the masticatory system. An analysis of the forces and torques applied to the mandible by muscles, joints, articular capsules, and teeth is used to assess the determinants of jaw movement. The principle of relating the interplay of forces to the center of gravity of the lower jaw, in contrast to a hinge axis near its joints, is introduced. It is evident that the muscles are the dominant determinants of jaw movement. The contributions of the individual muscles to jaw movements can be derived from the orientation of their lines of action with respect to the center of gravity of the lower jaw. They cause the jaw to accelerate with six degrees of freedom. The ratio between linear and angular accelerations is subtly dependent on the mass and moments of inertia of the jaw, and the structures that are more or less rigidly attached to it. The effects of articular forces must be taken into account, especially if the joints are loaded asymmetrically. The muscles not only move the jaw but also maintain articular stability during midline movements. Passive structures, such as the ligaments, become dominant only when the jaw reaches its movement boundaries. These ligaments are assumed to prevent joint dislocation during non-midline movements.

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Section: (4) Final Remarksmentioning

confidence: 99%

Dynamics of the Human Masticatory System

Koolstra

2002

Critical Reviews in Oral Biology & Medicine

203

110

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“…This result, as a whole, corroborates findings of other authors who showed that occlusion alterations can affect masticatory function and that children They related TMD with the increase of muscular tension at rest and with a loss of force. This relationship was relevant for the increase of masticatory muscle activity at rest while decreasing during maximum biting in the symptomatic patients when compared to the asymptomatic ones (Dahlström, 1989;Mohl et al, 1990b;Oliveira et al, 2004). Subjects with cross-bite also demonstrated larger patterns of muscular tension than of that in individuals with normal occlusion (Li et al, 1994;Miyamoto et al, 1999;Nuño-Licona et al, 1993).…”

Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

“…It is well known that different etiologies in adults and children can lead to occlusion disorders in which the diagnosis may or may not be supported by electromyography (García-Morales et al, 2003;Gomes et al, 1998;Mohl et al, 1990b;Palomari-Tobo et al, 1996;Shirrazi et al, 1990). For example, Sgobbi de Faria and Bérzin (1998) showed that the temporal resting activity in adults is higher than the masseter resting activity, even though normal subjects do not show excessive activity of those muscles in mandibular resting position.…”

Section: Introductionmentioning

confidence: 99%

“…For example, as for the dental research, elecromyographic analysis is used to measure the electric activity of normal facial muscles, or in pathological conditions (Basmajian and De Luca, 1985;Fridlund and Cacioppo, 1986). Among the pathological conditions are the temporomandibular dysfunctions, characterized by extrinsic or intrinsic alterations in the temporomandibular joint, which lead to functional disorders in the muscles of the face -mainly masseter and temporal muscles (Ali et al, 2003;Castroflorio et al, 2004; Dahlström, 1989;De-Luca, 1997;Mohl et al, 1990a).It is well known that different etiologies in adults and children can lead to occlusion disorders in which the diagnosis may or may not be supported by electromyography (García-Morales et al, 2003;Gomes et al, 1998;Mohl et al, 1990b;Palomari-Tobo et al, 1996;Shirrazi et al, 1990). For example, Sgobbi de Faria and Bérzin (1998) showed that the temporal resting activity in adults is higher than the masseter resting activity, even though normal subjects do not show excessive activity of those muscles in mandibular resting position.…”

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Avaliação eletromiográfica quantitativa de músculos faciais em crianças do sexo feminino com mordida cruzada

Fukuda¹,

Alvarez²,

Nassri³

et al. 2008

RBEB

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The electromyography has been widely used as a diagnostic method for facial muscle conditions. The aim of this study was to determine the RMS (Root Mean Square) value of the electromyographic signal of facial muscles in children with normal occlusion or cross-bite as well as to verify a possible clinical application of this parameter. "Normal group" was composed of female children with normal occlusion and "cross-bite group" was composed of female children with cross-bite. We performed quantitative electromyographic analysis of masseter and temporal muscles at rest and with maximum biting force. Our results showed that the occlusion modifications affect normal masticatory muscle function, and that the quantitative electromyography is an important tool to help diagnosing the malocclusion in female children. Considering the analysis of the results, we verified that the electromyographic rest activity of the masseter or temporal muscles in cross-bite female children is higher in relation to the rest activity of normal occlusion female children. We concluded that the RMS value of the masseteric and temporal electromyographic signal has a diagnostic value to discriminate female children with cross-bite from those with normal occlusion.Keywords: Electromyography, Malocclusion, Cross-bite. Resumo A eletromiografia tem sido amplamente utilizada como método diagnóstico de disfunções de músculos da face. O objetivo deste estudo foi determinar a tensão RMS do sinal eletromiográfico de músculos da face de crianças do sexo feminino com oclusão normal ou com mordida cruzada, visando avaliar uma possível aplicação clínica deste parâmetro. O "grupo normal" foi composto por crianças do sexo feminino com oclusão normal e o "grupo mordida cruzada" por crianças do sexo feminino com diagnóstico de mordida cruzada. Foram realizadas análises eletromiográficas quantitativas dos músculos masseter e temporal nas condições de repouso e em máxima contração voluntária isométrica (MCV). Considerando a relação da tensão RMS do sinal eletromiográfico no repouso e em MCV, nossos resultados mostraram que variações de oclusão influenciam a função muscular mastigatória normal e que a ele- Electromyography of facial muscles in cross-bite female childrenFukuda, T. Y.; Alvarez, A. S.; Nassri, L. F. G.; Godoy, C. M. G. IntroductionElectromyography consists of the graphic registration of the myoelectric signal, and it represents an important tool for quantification of muscular activity at rest and during contraction (Basmajian and De Luca, 1985;Fridlund and Cacioppo, 1986). Thus, electromyographic analysis has been widely used as a diagnostic method for muscular conditions in several situations and in different muscle functions. For example, as for the dental research, elecromyographic analysis is used to measure the electric activity of normal facial muscles, or in pathological conditions (Basmajian and De Luca, 1985;Fridlund and Cacioppo, 1986). Among the pathological conditions are the temporomandibular dysfunctions, characterized by extrin...

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Zur Wertigkeit der elektronischen Axiographie in der klinischen Funktionsdiagnostik

Lochmiller

Bumann

Landeweer

1991

Fortschritte der Kieferorthopädie

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Recent years have brought an increasing number of electronic jaw-tracking devices for instrumental analysis on the market. However sophisticated they may be, their diagnostic value for temporomandibular diseases is not well supported by scientific evidence. On the other hand, "manual examination"--a very refined diagnostic means acknowledged by orthopedians and adapted to the properties of the TMJ--yields a more reliable diagnosis which fits well to MRT data. We were hereby solicited to compare the information gained by jaw-tracking and manual examination. It was found that the recorded condylar movements gave no additional, diagnostically relevant insight that went beyond the manual examination. Nevertheless, the accuracy of jaw-tracking, with regard to the visualisation of internal derangements of the TMJ, was enhanced by the techniques of manual examination.

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Devices for the diagnosis and treatment of temporomandibular disorders. Part I: Introduction, scientific evidence, and jaw tracking

Cited by 96 publications

References 25 publications

Dynamics of the Human Masticatory System

Dynamics of the Human Masticatory System

Avaliação eletromiográfica quantitativa de músculos faciais em crianças do sexo feminino com mordida cruzada

Zur Wertigkeit der elektronischen Axiographie in der klinischen Funktionsdiagnostik

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