Clinical Examination for Stomatognathic Functions. By using Gnatho-hexagraph.

Tokiwa, Hajime; Kuwahara, Yousuke

doi:10.2186/jjps.42.902

Cited by 13 publications

(4 citation statements)

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“…The condylar displacement during clenching was recorded using a Gnatho‐hexagraph, which records jaw movements related to stomatognathic functions. The relevant 3‐D mandibular pathway and its time course were recorded with six degrees of freedom and an accuracy of ±150 μm . By comparing the data of condylar displacements to those measured by a jaw‐tracking devise, we confirmed the validity of the analysed data.…”

Section: Methodssupporting

confidence: 55%

Stress analysis in human temporomandibular joint affected by anterior disc displacement during prolonged clenching

Abe

Kawano

Kohge³

et al. 2013

J of Oral Rehabilitation

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Parafunctional habits, such as prolonged clenching and bruxism, have been associated with dysfunctional overloading in the temporomandibular joint (TMJ). In this study, stress distributions in the TMJ were analysed during prolonged clenching, using three-dimensional finite element (FE) models of the TMJ with and without disc displacement. The aim of this study was to investigate stress distribution of the cartilaginous tissues in the TMJ with and without disc displacement. Finite element models were developed on the basis of magnetic resonance images from two subjects with and without anterior disc displacement. Condylar movements recorded during a 5-min clenching were used as the loading condition for stress analysis. In the asymptomatic model, the highest von Mises stresses were located in the lateral area (4·91 MPa) of the disc surfaces, and after 5-min clenching, the higher stresses were still located at the lateral area (3·65 MPa). In all the cartilaginous tissues, 30-50% of stress reduction occurred during 5-min clenching. In contrast, the von Mises stress in the cartilaginous tissues of the symptomatic model with disc displacement was markedly lower, compared with the asymptomatic model. However, in the condylar cartilage, stress relaxation during clenching was not recognised. Furthermore, relatively high stresses were observed in the retrodiscal tissues throughout clenching. The present results indicate that disc position could be involved in the stress distribution of the TMJ components during prolonged clenching.

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Section: Methodssupporting

confidence: 55%

Stress analysis in human temporomandibular joint affected by anterior disc displacement during prolonged clenching

Abe

Kawano

Kohge³

et al. 2013

J of Oral Rehabilitation

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“…Accurate measurement of chewing movement is necessary in the clinical examination of chewing function, here, a Gnatho-hexagraph 21,22) , which collects accurate and reproducible data by a simple procedure, was used.…”

Section: Recording Methods and Equipmentmentioning

confidence: 99%

Evaluation of Chewing Movement in Skeletal Class III Patients with Orthognathic Treatment

Kim

Sakamoto

Yamaguchi

et al. 2017

Bull. Tokyo Dent. Coll.

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The objective of this study was to clarify the influence of improvement in morphology on chewing movement in patients with skeletal reversed occlusion following orthognathic treatment. A total of 10 patients with skeletal class III reversed occlusion undergoing orthognathic treatment were included in the study. A number of parameters, including chewing rhythm, maximum opening and closing velocities, and opening distance during chewing of gum, were measured in a pre-(Pre) and post-treatment (Post) group. The laterality and stability of the measured items were then compared between the two groups and with those in another group of subjects with normal occlusion (Control). Laterality of chewing movement was greater in the Pre group than in the Control group, and significant differences were noted in all parameters, apart from closing Vmax and opening distance. No significant difference was noted in any parameter between the Post and Control groups. The coefficient of variation was significantly higher in the Pre group than in the Control group, apart from for opening phase. All parameters showed a significant decrease in the Post group compared with in the Pre group, yielding a stable chewing movement. Comparison of the Post and Control groups revealed no significant difference in any of the parameters, apart from in the occluding phase. These findings suggest that orthognathic treatment of skeletal class III malocclusion improves chewing movement to levels close to those in subjects with normal occlusion.

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“…Early in 1960, electric six-degree-of-freedom jaw-tracking devices with rotary transmitters were developed [49]. Since then, many types of jaw-tracking devices have been developed and used in clinics as well as in research [50][51][52][53][54][55][56][57][58][59][60][61][62]. Currently, the manufactured products of these jawtracking devices have a variety of transducers such as optical sensors [40], measuring styli and flags [63] and ultrasound sensors [64].…”

Section: Measurement Of Jaw Movementmentioning

confidence: 99%

Current status of researches on jaw movement and occlusion for clinical application

Bando

Nishigawa

Nakano

et al. 2009

Japanese Dental Science Review

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Clinical Examination for Stomatognathic Functions. By using Gnatho-hexagraph.

Cited by 13 publications

References 0 publications

Stress analysis in human temporomandibular joint affected by anterior disc displacement during prolonged clenching

Stress analysis in human temporomandibular joint affected by anterior disc displacement during prolonged clenching

Evaluation of Chewing Movement in Skeletal Class III Patients with Orthognathic Treatment

Current status of researches on jaw movement and occlusion for clinical application

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