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Reliability of mandibular movement assessments depending on TMD
Angelika Rauch1, Oliver Schierz1
1a Department of Prosthodontics and Materials Science , University of Leipzig , Leipzig , Germany.
Objective:
This study determines the effect of temporomandibular disorders (TMD) on the reliability of mandibular movement assessments.
Methods:
The vertical and horizontal jaw movements, as well as overjet and overbite, were measured twice in 56 consecutively recruited adult subjects with TMD according to the RDC/TMD and 29 controls without TMD diagnosis by experienced dentists utilizing a millimeter ruler. The reliability was determined by intraclass correlation coefficient (ICC).
Results:
Neither statistically nor clinically relevant differences in the repeatability between both subgroups could be detected (all p ≥ 0.077). The mouth opening and overjet proved an excellent reliability (ICC 0.85-0.92). Overbite and laterotrusion showed good to excellent reliable results (ICC 0.74-0.82). The second measurement of the vertical jaw movement resulted in systematically higher values (p < 0.003).
Discussion:
The assessment of the mandibular movement with a millimeter ruler is a reliable procedure irrespective of TMD. To decrease the variances in the mouth opening measurements, the patient should be asked beforehand to practice this movement.
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