Prevalence of TMD, TMD pain, DJD and mandibular movement capacity in the study sample
| | ERA group (n=50) | At-risk group (n=50) | Control group (n=50) | Test statistics | P value |
| Diagnosis according to DC/TMD | |||||
| TMD diagnosis* (n (%)) | 20 (40) | 19 (38) | 14 (28) | χ2= 1.604*, 1.131† | 0.205‡§, 0.288¶§ |
| TMD-pain diagnosis† (n (%)) | 7 (14) | 8 (16) | 2 (4) | χ2= 4.000† | 0.16‡ ** 0.046¶§ |
| DJD diagnosis (n (%)) | 6 (12) | 2 (4) | 2 (4) | 0.269‡ ** 1.0¶ ** | |
| Bruxism | |||||
| Probable sleep bruxism (n (%)) | 9 (18) | 14 (28) | 11 (22) | 0.485§ | |
| Mandibular movement capacity | |||||
| Maximum mouth opening, mm (mean (SD)) | 49.1±7.2 | 51.4±5.2 | 50.7±6.3 | F=1.815 | 0.167†† |
| Maximum protrusion, mm (mean (SD)) | 8.5±2.1 | 7.8±2.5 | 8.2±2.8 | F=0.836 | 0.436†† |
| Maximum laterotrusion, mm (mean (SD)) | 10.6±2.3 | 10.7±2.4 | 9.9±3.0 | F=1.332 | 0.267†† |
Significant p-values are presented in bold writing.
*Myalgia, arthralgia, disc displacement, DJD and/or headache attributed to TMD.
†Myalgia and/or arthralgia.
‡ERA group versus control group.
§χ2 test.
¶At-risk group versus control group.
**Fisher's exact test.
††One-way ANOVA (F).
ANOVA, analysis of variance; DC, diagnostic criteria; DJD, degenerative joint disease; ERA, early rheumatoid arthritis; n, number of observations; TMD, temporomandibular disorders.