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The object of this study was to analyze the influence of design parameters for the acidetched retainers' metal frameworks, such as thickness, shape, materials on the stress distribution and resistance for pealing loads. The analysis was conducted by the means of two dimensional finite element method, and the resistance for pealing loads were obtained by comparing with results of our previous experiments.Following results were obtained.1) The thicker the metal framework became, the bigger the resistance for pealing loads obtained.2) Proximal extension of the metal framework could help increasing the resistance for pealingloads.3) Joint between abutment and pontic portion of the metal frameworks should be completely flexible in term of the stress distribution in bonding materials.4) Materials with high rigidity should be used for the metal frameworks of the acid-etched retainers.5) The thickness of bonding materials, such as 4-META adhesive resin, should be minimum in terms of the resistance for pealing loads.

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Mechanical analysis on design parameters for adhesion bridge. Part 2 Finite element analysis of infuluence of thickness, shape and materials on pealing loads.