Torque Stability of Different Abutment Screws Submitted to Mechanical Cycling


Autoria(s): Vianna, Camila de Assis; Delben, Juliana Aparecida; Barao, Valentim A. R.; Ferreira, Mayara Barbosa; Santos, Paulo Henrique dos; Assunção, Wirley Goncalves
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

03/12/2014

03/12/2014

01/09/2013

Resumo

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Processo FAPESP: 10/17314-0

Purpose: To evaluate the torque stability of different UCLA retention screws of single implant-supported crowns submitted to mechanical cycling. Materials and Methods: Crowns fabricated from nickel-chromium-molybdenum alloy were attached to external-hexagon implants and grouped by the different retention screws used (n = 10): Ti, titanium screws (BRUNIHT, Biomet 3i); Au, gold-palladium screws with 24-carat gold coating (Gold-Tite, Biomet 3i); TiC, titanium alloy (Ti-6Al-4V) screw with diamondlike carbon coating (Neotorque, Neodent); and TiN, Ti-6Al-4V screw with aluminum-titanium-nitride coating (Ti-Tite, Conexao). Three initial removal torque (RT) values were obtained for each screw after torque insertion using an analog torque gauge. The final RT was measured after mechanical cycling (1 x 10(6) cycles at 2 Hz under 130 N). Data were submitted to analysis of variance and the Fischer test. Results: Statistically significant differences were observed between the initial RT in groups Ti and TiN, and between TiC and TiN. No statistically significant difference was seen between mean RT obtained before and after mechanical cycling, except for the Ti screws. All groups exhibited similar torque maintenance after mechanical cycling. Conclusion: Although no significant difference was observed among groups for the final percentage of torque maintenance, the final RT values of the coated screws were higher than those of the noncoated screws.

Formato

E209-E214

Identificador

http://dx.doi.org/10.11607/jomi.3110

International Journal of Oral & Maxillofacial Implants. Hanover Park: Quintessence Publishing Co Inc, v. 28, n. 5, p. E209-E214, 2013.

0882-2786

http://hdl.handle.net/11449/112449

WOS:000324733800002

Idioma(s)

eng

Publicador

Quintessence Publishing Co Inc

Relação

International Journal of Oral & Maxillofacial Implants

Direitos

closedAccess

Palavras-Chave #coating #gold #implant-supported prosthesis #retention screw #titanium #torque maintenance
Tipo

info:eu-repo/semantics/article