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Effect of Occlusal Interference on Habitual Activity of Human Masseter

¹ Department of Dental and Maxillo-Facial Sciences, Section of Orthodontics and Clinical Gnathology, School of Dentistry, University of Naples "Federico II", Via Pansini, 5.I-80131, Italy; and
² Clinic for Masticatory Disorders and Complete Dentures, Center for Oral Medicine, Dental and Maxillo-Facial Surgery, University of Zürich, Switzerland;

View larger version (20K): [in a new window]   Figure 1. Description of the study design. IFC = interference-free condition; DIC = dummy interference condition; AIC = active interference condition.

View larger version (25K): [in a new window]   Figure 2. Number of events/hr (mean and standard error of the mean, N = 11) for conditions IFCbefore, DIC, AIC, and IFCafter. Student’s t test; * = p < 0.05; ** = p < 0.01.

View larger version (17K): [in a new window]   Figure 3. Plots of N/hr for events with amplitudes 10–20, 20–30, and 30–40% MVC vs. event duration, for the conditions IFCbefore, DIC, AIC, and IFCafter. Data presented in the charts (dots = mean values, N = 11) were averaged across subjects, conditions, and recording days. Two-factor (dental condition, amplitude level) repeated-measurements analysis of variance was computed on the log values of areas under the curves (AUC) of each individual data point (Kolmogorov-Smirnov test; p > 0.05): The conditions differed with statistical significance (F = 12.1; p < 0.001), with lower values during AIC (Student-Newman-Keuls test; p < 0.001). At higher amplitude levels, a significant negative trend of AUC was found for the activity periods recorded during AIC (test for linear trend; p < 0.001). N/hr = number of activity periods per hour; MVC = maximal voluntary contraction; IFC = interference-free condition; DIC = dummy interference condition; AIC = active interference condition.