A study of diagnostic test for TMD based on bite force distribution.

概要

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The purpose of this study was to clarify the characteristic of bite force distribution on the dental arch in the TMD patients and to evaluate a efficacy of diagnostic test for TMD based on the bite force distribution. Bite force was measured during maximum voluntary clenching at intercuspal position by pressure sensitive film, "Dental Prescale 50H, type R (Fuji photo film, Co.). Subjects involved in this study were 64 TMD patients and 42 normal subjects.Asymmetry index of bite force (AI) was defined as a percentage of the difference in bite force between the left and right sides to the sum. AI was 14.5±12.6% in TMD patients and was 9.3±6.3% in normal subjects. Significant difference was not observed in between these two groups (p=0.06). The number of subjects whose AI were out of 2 S. D. range was significantly larger in TMD than in normal subjects (p<0.01). The number of subjects in whom the proportion of the bite force on the first molar to the total bite force was lower than mean -2 S. D. was significantly larger in TMD patients than in normal subjects (p<0.01). A diagnostic test for TMD using these two criteria showed low sensitivity (37.5%) and high specificity (96.4%). If other parameters would be added, this test would become useful clinically.
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