Muscle activity and masticatory efficiency with bilateral extension base removable partial dentures with different cusp angles

Publication date: Available online 20 June 2017
Source:The Journal of Prosthetic Dentistry
Author(s): Mahmoud K. AL-Omiri
Statement of problemWhether masticatory efficiency and electromyographic activity are influenced by type of artificial teeth and food is unclear.PurposeThe purpose of this clinical study was to evaluate the influence of extension base removable partial dentures (RPDs) with different cusp angles: anatomic (33 degrees), semianatomic (20 degrees), and nonanatomic (0 degrees) teeth on masticatory efficiency and muscle activity during the mastication of test foods with different textures.Material and methodsTwelve participants with RPDs were selected to perform masticatory efficiency and electromyographic tests. Surface electromyograms (EMGs) were used to record the activities of the masseter and temporalis muscles during the mastication of different types of test foods. The maximal voltage and duration were measured on the integrated EMG signal in each muscle during food mastication, and the mean reading of both sides was then recorded. Analysis of variance and the Tukey post hoc test were used to perform statistical analyses (α=.05).ResultsThe masticatory efficiency of RPDs with nonanatomic teeth was significantly inferior to that of RPDs with anatomic and semianatomic teeth (P<.05). However, masticatory efficiency did not differ between anatomic and semianatomic teeth (P>.05). Also, muscle activity (according to EMG) with RPDs with NA teeth was significantly higher than that with anatomic and semianatomic teeth (P<.05).ConclusionsRPDs with NA teeth were associated with higher EMG muscle activity and reduced masticatory efficiency than anatomic or semianatomic teeth.



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