Effect of Vertical Misfit on Screw Joint Stability of Implant-Supported Crowns

Autor(es)

Assuncao, Wirley Goncalves ^{[1, 2]} ; Delben, Juliana Aparecida ^{[1, 2]} ; Tabata, Lucas Fernando ^{[1, 2]} ; Ricardo Barao, Valentim Adelino ^{[1, 2]} ; Gomes, Erica Alves ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP, Dept Dent Mat & Prosthodont, Aracatuba Dent Sch, Sao Paulo - Brazil

^[2] Univ Estadual Paulista, Dept Dent Mat & Prosthodont, Fac Odontol Aracatuba, BR-16015050 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Materials Engineering and Performance; v. 20, n. 6, p. 947-951, AUG 2011.
• Citações Web of Science: 2

Resumo

The passive fit between prosthesis and implant is a relevant factor for screw joint stability and treatment success. The aim of this study was to evaluate the influence of vertical misfit in abutment-implant interface on preload maintenance of retention screw of implant-supported crowns. The crowns were fabricated with different abutments and veneering materials and divided into 5 groups (n = 12): Gold UCLA abutments cast in gold alloy veneered with ceramic (Group I) and resin (Group II), UCLA abutments cast in titanium veneered with ceramic (Group III) and resin (Group IV), and zirconia abutments with ceramic veneering (Group V). The crowns were attached to implants by gold retention screws with 35-N cm insertion torque. Specimens were submitted to mechanical cycling up to 10(6) cycles. Measurements of detorque and vertical misfit in abutment-implant interface were performed before and after mechanical cycling. ANOVA revealed statistically significant difference (P < 0.05) among groups for vertical misfit measured before and after mechanical cycling. The abutments cast in titanium exhibited the highest misfit values. Pearson correlation test did not demonstrate significant correlation (P > 0.05) between vertical misfit and detorque value. It was concluded that vertical misfit did not influence torque maintenance and the abutments cast in titanium exhibited the highest misfit values. (AU)

• Processo FAPESP: 07/53140-3 - Influência de diferentes pilares e materiais de recobrimento estético na manutenção de pré-carga do parafuso de retenção de coroas implanto suportadas
• Beneficiário: Juliana Aparecida Delben
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 07/04181-9 - Influência de diferentes pilares e materiais de recobrimento estético na manutenção da pré-carga do parafuso de retenção de coroas implanto-suportadas
• Beneficiário: Wirley Goncalves Assuncao
• Modalidade de apoio: Auxílio à Pesquisa - Regular