Avalia??o da pr?-carga e do torque de remo??o p?s ciclagem mec?nica da conex?o implante-pilar prot?tico tipo cone morse com e sem ?ndice de posicionamento

• Ano de defesa: 2012
• Autor(a) principal: Villarinho, Eduardo Aydos
• Orientador(a): Teixeira, Eduardo Rolim
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Pontif?cia Universidade Cat?lica do Rio Grande do Sul
• Programa de Pós-Graduação: Programa de P?s-Gradua??o em Odontologia
• Departamento: Faculdade de Odontologia
• País: BR
• Palavras-chave em Português: ODONTOLOGIA; IMPLANTODONTIA; PR?TESE DENT?RIA
• Área do conhecimento CNPq: CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA
• Link de acesso: http://tede2.pucrs.br/tede2/handle/tede/1167

The biomechanical stability of the prosthetic implant-abutment assembly is crucial to the success of implant supported rehabilitation. For this, knowledge about the values of preload and removal torque after the mechanical fatigue test is essential. Therefore, this study aimed to compare values of preload and removal torque after cycling of the new design Morse taper with placement index connection implant-abutment compared to that without content, verifying possible biomechanical advantages of its use. A set of 20 Morse taper implants (3,75 x 11) was inserted into acrylic tubes at a 30? angle and divided into two groups: 10 with universal posts using prosthetic positioning index and 10 without the index, all of the abutments were straight indicated for cemented unitary prosthesis with a 1.5 mm neck height, diameter of 4.5 mm and body height of 6 mm. During the insertion torque of the pillars the pre-load screw of the two groups was measured using extensometry. With the pillars in position, we fitted prosthetic crowns and both groups were exposed to mechanical cycling with a force of 110 N and 500 000 repetitions in saline environment, and after the values of removal torque were measured. Observing the pre-load values, group No Index (6.05 N) were higher than the group With Index (4.88 N), there were statistically significant differences (p = 0.012) between the groups. As for removal torque, the group No Index showed an average percentage of torque loss of 13.84%, while the group With Index a torque loss of 52.65%, with statistically significant difference between them using the t-Student test (p < .001). Therefore, according to the methodology applied in this in vitro study there was a higher biomechanical stability using the abutments without the index position of the Morse taper system compared to the abutments with the index position