A comparative study of microstrain around three-Morse taper implants, casting with machined and plastic copings, under axial loading
Extensometria: estudo das microdeformações ao redor de três implantes de conexão protética cone-Morse, fundidos com coifas plásticas e usinadas, submetidos à carga vertical estática
Nishioka, Renato Sussumu; Santos, Vivian Mayumi Miyazaki; Nishioka, Gabriela Nogueira de Melo; Balducci, Ivan
Rev. odontol. UNESP, vol.41, n1, p.54-59, 2012
Abstract
Objective: The aim of this in vitro study was quantify the microstrain around Morse taper implants using plastic(n=5) and machined(n=5) copings under axial loading. Methods: Three implants of Morse taper junction were embedded in the center of the polyurethane block. Four Strain gauges (SG) were bonded on the surface of polyurethane and it was designated SG1 placed mesially adjacent to implant A, SG2 and SG3 were placed mesially and distally adjacent to the implant B and SG4 was placed distally adjacent to the implant C. The ten CoCr superstructure’s occlusal screws were tightened onto the Microunit abutments with a torque of 10 N.cm using the manufacture’s manual torque- controlling device. Axial load of 30kg was applied at three predetermined points (A, B, C). The strain gauges were only capable of detecting strain in a limited segment around the implants. All of the data were compared using RM ANOVA and post hoc multiple range Tukey test (α=.005). Result. The results did not show a statistically significant difference for the copings (p= 0,0838), but showed a statistically significant difference for the loading points (p= 0.0338). Conclusion: There were not evidences that the machined copings in reducing the strain around implant. The loading point persuaded in the magnitude of micro strain.
Keywords
Morse taper, strain development, biomechanics, axial loading
Resumo
Objetivo: Analisar, por meio da extensometria, as microdeformações ao redor de implantes cone-Morse com diferentes tipos de coifas, plásticas(n=5) e usinadas(n=5). Foram inseridos linearmente três implantes cone-Morse no bloco de poliuretano. Método: Quatro extensômetros (SG) foram colados na superfície do poliuretano e foram identificados pelo SG1 que foi colado adjacente e mesialmente ao implante A, pelo SG2 e SG3 colados adjacentes mesial e distal ao implante B e o SG4 que foi colado distal ao implante C. Dez supraestruturas em CoCr foram parafusadas sobre pilares protéticos Microunit com torque de 10N.cm com auxílio de um torquímetro manual. Cargas axiais de 30kg foram aplicadas sobre pontos pré determinadas(A,B,C) sobre os respectivos parafusos de retenção das próteses. Os extensômetros foram capazes de analisar as microdeformações num limitado segmento ao redor dos implantes. Os registros foram comparados utilizando ANOVA de medidas repetitivas e teste múltiplo de Tukey α=.005). Resultado: Os registros não evidenciaram diferença estatística signficante para o tipo de coifa (p= 0,0838), contudo evidenciou-se diferença estatística para os pontos de aplicação de carga (p= 0.0338). Conclusão: Não houve evidências que as coifas usinadas reduziram as microdeformações ao redor dos implantes. O ponto de aplicação de carga determinou a quantidade de micro deformações.
Palavras-chave
Cone, microdeformação, biomecânica, carga axial.
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