Effect of repeated torque/mechanical loading cycles on two different abutment types in implants with internal tapered connections: an in vitro study


Autoria(s): COPPEDE, Abilio Ricciardi; MATTOS, Maria da Gloria Chiarello de; RODRIGUES, Renata Cristina Silveira; RIBEIRO, Ricardo Faria
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

19/10/2012

19/10/2012

2009

Resumo

Internal tapered connections were developed to improve biomechanical properties and to reduce mechanical problems found in other implant connection systems. The purpose of this study was to evaluate the effects of mechanical loading and repeated insertion/removal cycles on the torque loss of abutments with internal tapered connections. Sixty-eight conical implants and 68 abutments of two types were used. They were divided into four groups: groups 1 and 3 received solid abutments, and groups 2 and 4 received two-piece abutments. In groups 1 and 2, abutments were simply installed and uninstalled; torque-in and torque-out values were measured. In groups 3 and 4, abutments were installed, mechanically loaded and uninstalled; torque-in and torque-out values were measured. Under mechanical loading, two-piece abutments were frictionally locked into the implant; thus, data of group 4 were catalogued under two subgroups (4a: torque-out value necessary to loosen the fixation screw; 4b: torque-out value necessary to remove the abutment from the implant). Ten insertion/removal cycles were performed for every implant/abutment assembly. Data were analyzed with a mixed linear model (P <= 0.05). Torque loss was higher in groups 4a and 2 (over 30% loss), followed by group 1 (10.5% loss), group 3 (5.4% loss) and group 4b (39% torque gain). All the results were significantly different. As the number of insertion/removal cycles increased, removal torques tended to be lower. It was concluded that mechanical loading increased removal torque of loaded abutments in comparison with unloaded abutments, and removal torque values tended to decrease as the number of insertion/removal cycles increased. To cite this article:Ricciardi Coppede A, de Mattos MdaGC, Rodrigues RCS, Ribeiro RF. Effect of repeated torque/mechanical loading cycles on two different abutment types in implants with internal tapered connections: an in vitro study.Clin. Oral Impl. Res. 20, 2009; 624-632.doi: 10.1111/j.1600-0501.2008.01690.x.

National Council for Scientific and Technological Development (CNPq)

Identificador

CLINICAL ORAL IMPLANTS RESEARCH, v.20, n.6, p.624-632, 2009

0905-7161

http://producao.usp.br/handle/BDPI/26373

10.1111/j.1600-0501.2008.01690.x

http://dx.doi.org/10.1111/j.1600-0501.2008.01690.x

Idioma(s)

eng

Publicador

WILEY-BLACKWELL PUBLISHING, INC

Relação

Clinical Oral Implants Research

Direitos

restrictedAccess

Copyright WILEY-BLACKWELL PUBLISHING, INC

Palavras-Chave #dental implants #internal tapered connection #loosening torque #prosthesis and implants #tightening torque #IMPLANT/ABUTMENT JOINT DESIGNS #DENTAL IMPLANTS #FATIGUE RESISTANCE #CONICAL INTERFACE #PROSTHETIC SCREWS #REPEATED TORQUE #MECHANICS #STRENGTH #COMPLICATIONS #SYSTEMS #Dentistry, Oral Surgery & Medicine #Engineering, Biomedical
Tipo

article

original article

publishedVersion