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Abstract
In vitro study was to compare to the retentive between two types of esthetic flexible clasps. Acetal versus Bre-flex 2nd edition in bilateral bounded maxillary removable partial denture cases. Materials and methods: Standard experimental metal model of maxillary edentulous case (Kennedy class III with modification 1) missing right and left second premolars and first molars was fabricated to be used as master model to simulate the oral cavity. Fourteen RPD frameworks were fabricated by thermopress 400. Seven RPDs for each group which group (A) acctal RPD and group (B) 2th edition each. AKer clasp design was engaged 0.02 inch undercut for all clasps mesiobuccal of first premolar and distobuccal of second molar on boty sides of framework. Loop was centralized in the major connector. Digital force gauge was used for both groups to measure the retention. The pulling force was gradually applied until the framework was dislodged