The purpose of this study was to investigate the influencing factors related with severity of temporomandibular joint pain and to develop a model of pain prediction. For this study, 114 patients with temporomandibular disorders were selected from the patients presented to Wonkwang university dental hospital. Chief complaint of these subjects was temporomandibular joint pain. 35 items from history taking, clinical examination, occlusal relation, radiographic findings, and health questionnaire were investigated before treatment.
100mm visual analogue scale(VAS) was explained to subjects, and subjects checked the degree of pain that they felt on the scale whenever they visit. The value of VAS at end of treatment was used to divide subjects into two groups, that was, recovered group and partially remissioned group. If VAS at the end of treatment were 10mm or less, the subject was classified as recovered group, and If VAS at the end of treatment were more than 10mm, the subject was classified as partially remissioned group. Mean value of VAS at the end of treatment was 5mm in recovered group, and 34mm in partially remissioned group. The treatment duration was 3.4 months, and 3.1 months, respectively.
VAS before and at the end of treatment were statistically processed and tested according to the standard of each item, and correlation of VAS before treatment with that at the end of treatment was analysed. From this result, the items showing significant difference or correlation were put into multiple regression analysis, and through stepwise method, 3 items were included in each equation.
The equation for the prediction of VAS value at the first visit(before treatment) were Y=5.628-1.071×presence of joint sound +0.0037×sum of Social readjustment rating scale(SRRS) +0.712×presence of neck pain. The adjusted R square of this equation was 0.180 and significance level was less than 0.001.
The equation for the prediction of VAS value at the last visit(the end of treatment) were Y=-0.530 + 0.0047×sum of Social readjustment rating scale(SRRS) + 0.048×value of phobic anxiety from SCL-90-R-0.763×presence of jaw rigidity. The adjusted R square R square of this equation was 0.141 and significance level was less than 0.001.
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