Liberdade rotacional de restaurações totalmente cerâmicas sobre componentes ceraone
Abstract
Objetivo: Este estudo avaliou a desadaptação interna de sistemas cerâmicos em prótese sobre implantes em relação à liberdade rotacional das restaurações após várias cocções da porcelana. Materiais e métodos: Foram analisados três sistemas cerâmicos: Procera AllCeram, In-Ceram e CeraOne sobre análogo e intermediário CeraOne. A liberdade rotacional foi medida com um dispositivo acoplado a um relógio comparador em quatro tempos: fase de coifa, após aplicação do corpo da porcelana e glaze, e após duas queimas adicionais. Os dados foram analisados por testes de Friedman, de Kruskal-Wallis e de Wilcoxon, α = 0,01. Resultados: As médias de liberdade rotacional em graus foram: 0,08 para In-Ceram/Análogo; 1,64 para Procera/ Intermediário; 1,72 para CeraOne/Intermediário; 1,88 para CeraOne/Análogo e 1,97 para Procera/Análogo. O sistema In-Ceram sobre o análogo apresentou níveis de liberdade rotacional dez a vinte vezes menores que CeraOne e Procera. Não houve diferença entre as fases de confecção da restauração para In-Ceram. O comportamento de CeraOne e Procera foi similar, com aumento da liberdade rotacional sobre intermediário e análogo com a progressão da confecção da restauração. A liberdade rotacional sobre intermediário foi menor que sobre análogo. Conclusão: A liberdade rotacional variou em função da etapa do processo de fabricação dependendo do sistema totalmente cerâmico.
UNITERMOS: adaptação; cerâmica; implante dentário.
SUMMARY
Aim: This study evaluated the rotational accuracy between single-tooth all-ceramic restoration and laboratory analog/abutment. Materials and methods: Three all-ceramic systems were tested: Procera AllCeram, In-Ceram, and CeraOne. Rotation freedom was measured with a customized device at four phases of the restoration manufacturing process: coping, after application of ceramic and glaze, and after two additional firings. Data were analyzed using Friedman, Kruskal-Wallis, and Wilcoxon tests at α = 0.05. Results: The mean values of rotational freedom for each set of ceramic system/support element were (in degrees): 0.08 for In-Ceram/Analog; 1.64 for Procera/Abutment; 1.72 for CeraOne/Abutment; 1.88 degrees for CeraOne/Analog; and 1.97 for Procera/Analog. In-Ceram on analog had rotational freedom values tento twenty-fold lower than the systems CeraOne and Procera. In-Ceram had no significant difference of rotational misfit for any of the four stages of fabrication. CeraOne and Procera systems showed similar patterns with increasing rotational freedom along the manufacturing phases, considering both abutment and analog measurements. The values of rotational freedom for the Abutment group were significantly lower than for the Analog group. Conclusion: Rotational freedom varied as a function of the stage of the manufacturing process depending on the all-ceramic system.
UNITERMS: adaptation; ceramics; dental implantation.
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