Currently, there is not scientific evidence to determine the importance that each rehabilitated tooth has in the mastication of removable denture wearers. The purpose of this study is to determine the impact of specific alteration on occlusal support in mastication of removable denture wearers. The experimental design will be paired and the sample will consist of 20 volunteers, with complete edentulism in upper jaw and Class I of Kennedy partial edentulism in lower jaw (presence of anterior teeth until canines), with age of 40-60 years. The volunteers will be conventionally rehabilitated with upper complete denture (CD) and lower removable partial denture (RPD), except that the artificial teeth of the latter will be subjects to removal and replacement in their prosthesis bases, with the aim of altering selectively and intentionally the occlusal support and consequently the number of occlusal pairs. Thus, all volunteers receive new CDs and RPDs made with all posterior artificial teeth, until second molars. After a period of 60 days of use of them, the number of occlusal contacts will be recorded. Changing the occlusal support will be made possible by selective removal and replacement of artificial teeth in lower RPD base, setting 12 conditions: (G1) presence of all posterior artificial teeth until seconds molars (positive control); (G2) presence of artificial teeth until first premolars (negative control); (G3) presence of artificial teeth until seconds pre-molars; (G4) presence of artificial teeth until first molars; (G5) specific bilateral removal of artificial first molars teeth; (G6) specific bilateral removal of artificial second pre-molar teeth; and (G7) specific bilateral removal of artificial first premolar teeth. The removal of artificial teeth will be specific, and they will be repositioned after each mastication assessment of all voluntaries. Thus, this will be evaluated through masticatory performance and efficiency calculation, and selection and breakage functions, according each variation of occlusal support, every 15 days. For this, it will be used Optocal material test comminution and sieving analysis of comminuted material methods. During the measurement of masticatory performance and efficiency, it will be obtained quality and quantity kinesiographic records of the masticatory movement pattern in frontal and sagittal planes. Finally, the masticatory ability will be examined through a Likert questionnaire. The data obtained will be subsequently submitted to exploratory analysis, and appropriate statistical tests will be applied in order to find possible link between the variables of study.
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