Influence of the casting technique and dynamic loading on screw detorque and misfit of single unit implant-supported prostheses

Autor(es)

Brilhante Bhering, Claudia Lopes ^[1] ; Ferreira Koyama Takahashi, Jessica Mie ^[2] ; Luthi, Leonardo Flores ^[3] ; Pessanha Henriques, Guilherme Elias . ^[4] ; Xediek Consani, Rafael Leonardo ^[5] ; Mesquita, Marcelo Ferraz ^[6]

Afiliação do(s) autor(es)

^[1] Piracicaba Dent Sch. Dept Prosthodont & Periodontol

^[2] Amazonas State Univ. Hlth Sci Grad Sch

^[3] West Univ Santa Catarina. Dept Prosthodont

^[4] Piracicaba Dent Sch. Dept Prosthodont & Periodontol

^[5] Piracicaba Dent Sch. Dept Prosthodont & Periodontol

^[6] Piracicaba Dent Sch. Dept Prosthodont & Periodontol

• Tipo de documento: Artigo Científico
• Fonte: ACTA ODONTOLOGICA SCANDINAVICA; v. 71, n. 3-4, p. 404-409, MAY-JUL 2013.
• Citações Web of Science: 6

Resumo

Objective. This study aimed to evaluate the influence of the casting procedure and cyclic loading of prosthetic frameworks on detorque of prosthetic screws and marginal misfit of single unit implant-supported prostheses. Materials and methods. Twenty specimens were obtained, each one consisting of a set of an implant (external hexagon 3.75 x 13 mm - Branemark type), a prosthetic abutment (entirely calcinable or overcasted UCLA) and a prosthetic screw. After the specimens were obtained, the prosthetic screws were tightened with 30 Ncm torque and released 24 h later in order to evaluate initial detorque. The screws were retightened and marginal gaps were assessed. All specimens were submitted to 10(6) loading cycles, performed with 2 Hz frequency and 130 N load. The specimens were re-evaluated for marginal misfit and detorque after the mechanical loading (final marginal misfit/ final detorque). The results were submitted to analysis of variance for repeated measurements, followed by Tukey HSD test (alpha = 0.05). Results. No statistically significant differences were found on detorque values of the prosthetics screws for all groups and intervals evaluated (p = 0.8922). The entirely calcinable abutments showed higher initial marginal misfit compared to the overcasted ones (p = 0.0438). There was no statistically significant difference on marginal misfit before and after mechanical loading for both groups (p > 0.05). Conclusions. It can be concluded that the overcasted abutments showed lower misfit values when compared to the entirely casted abutments. No difference was observed on detorque values of prosthetic screws. After mechanical loading there was no difference on marginal misfit and detorque between the groups. (AU)

• Processo FAPESP: 09/18473-7 - Influência do componente protético usinado ou fundido e da ciclagem mecânica sobre o torque de afrouxamento de parafusos protéticos e o desajuste de próteses unitárias implanto-suportadas
• Beneficiário: Cláudia Lopes Brilhante Bhering
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica