Abstract
it has been well known that various symptoms are observed in craniomandibular disorders (CMD). The aim of this study was to clarify the prevalence patterns of the symptoms observed at the first examination of 391 CMD patients. Relationships between two different symptoms were analyzed using chi-square test and phi-coefficient. The following results were obtained.1. There were strong relationships between opening pain (OP) and chewing pain (CP), OP and limited opening (LO), LO and CP, with phi-coefficient of 0.356, 0.270 and 0.237, respectively. Percentages observed were the following, OP-65.0%, LO-60.4% and CP-42.2% in samples.2. Spontaneous pain (SP) was less prevalent (25.3%), however it was accompanied by CP, OP and LO with high percentage of 58.6%, 74.7% and 62.6%, respectively. Spontaneous pain would be regarded as a symptom indicating the severe stage of CMD.3. Although TMJ noise was the third prevalent symptom (51.9%), there were no relationships to the other symptoms except LO. The onset mechanism of TMJ noises would be different from the other symptoms.4. Headache and shoulder stiffness showed strong relationships to the other symptoms except TMJ noise, so that these could be typical in CMD symptoms.5. Earache and tinnitus observed in less than 10% of patients showed strong relationships to spontaneous pain.6. Dizziness showed no relationships to major symptoms. Dizziness would not be a typical CMD symptom.
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