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Objetivo. O objetivo deste estudo foi avaliar o efeito da incorporação de fibra de vidro, zircônia e nano-zircônia na resistência transversal de base de prótese dentária reparada. Materiais e métodos. Oitenta espécimes de resina acrílica polimerizada termicamente foram preparados e divididos aleatoriamente em oito grupos: um grupo intacto (controle) e sete grupos reparados. Um grupo foi reparado com resina autopolimerizada enquanto os outros seis grupos foram reparados usando resina autopolimerizada reforçada com 2% em peso ou 5% em peso de fibra de vidro, zircônia ou partículas de nano-zircônia. Um teste de flexão de três pontos foi usado para medir a resistência transversal. Os resultados foram analisados usando SPSS e ANOVA de medida repetida e teste post hoc de mínima significância (LSD). Resultados.Entre os grupos reparados, verificou-se que a resina autopolimerizada reforçada com 2 ou 5% em peso de nano-zircônia apresentou a maior resistência transversal. Reparos com resina acrílica autopolimerizada reforçada com 5% em peso de zircônia apresentaram o menor valor de resistência transversal. Não houve diferença significativa entre os grupos reparados com resina de reparo sem reforço, 2% em peso de zircônia e resina reforçada com fibra de vidro. Conclusão. O reforço do material de reparo com nano-zircônia pode melhorar significativamente a resistência transversal de alguns polímeros de base de prótese dentária fraturada.
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