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Artificial tooth fracture or detachment from the denture base has remained an unresolved problem. However, structural designs in part of anteriors can minimize tooth fracture and detachment.In this study, designing four kinds of framework (double structure, facing modified double structure, metal backing, and skeleton with the pivot) and no framework as control, the resistance to debonding and fracture of artificial anteriors were measured.Conventional heat-curing resin as the denture base and crosslinked plastic teeth were used for each specimen. Statical loading test, artificial anterior load applied to the incisal edge and lingual tubercle, was used in the evaluation.The results were as follows:1. When the load was applied to the lingual tubercle, the ultimate strength was approximately 2-4 times higher than that to the incisal edge.2. When the load was applied to the incisal edge, the ultimate strengths of the double structure and skeleton with the pivot were approximately 1.4 times stronger than that of the other designs.3. Loading to the lingual tubercle, the ultimate strengths of the double structure and facing modified double structure showed the highest, while the control showed the lowest.4. The failure pattern of metal backing, the double structure and facing modified double structure had cohesive failure within the denture resin.

Effect of Structural Designs in the Removable Dentures on Artificial Anteriors Fracture/Detachment.