RESEARCH ARTICLE


Influence of Prosthetic Screw Material on Joint Stability in Passive and Non-Passive Implant-Supported Dentures



Aloísio Oro Spazzin1, *, Guilherme Elias Pessanha Henriques1, Mauro Antônio de Arruda Nóbilo1, Rafael Leonardo Xediek Consani1, Lourenço Correr-Sobrinho2, Marcelo Ferraz Mesquita1
1 Department of Prosthodontics and Periodontics, Dental School of Piracicaba, State University of Campinas, 901 Avenue Limeira, Piracicaba, SP 13414-903, Brazil
2 Department of Restorative Dentistry, Dental Materials Division, Dental School of Piracicaba, State University of Campinas, 901 Avenue Limeira, Piracicaba, SP 13414-903, Brazil


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Creative Commons License
© Spazzin et al.; Licensee Bentham Open.

open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

* Address correspondence to this author at the Department of Prosthodontics and Periodontics, Dental School of Piracicaba, State University of Campinas – UNICAMP, 901 Avenue Limeira, Piracicaba, SP 13414-903, Brazil; Tel: 19 96332575 or 19 21065297; Fax: 19 21065211; E-mail: aospazzin@yahoo.com.br


Abstract

Objectives:

This study evaluated the influence of prosthetic screw material on joint stability in implantsupported dentures at two levels of fit.

Methods:

Ten mandibular implant-supported dentures were fabricated. Twenty cast models were fabricated using these dentures. Four groups (n=10) were tested, according to the vertical fit of the dentures [passive and non-passive] and prosthetic screw materials [titanium (Ti) or gold (Au) alloy]. The one-screw test was performed to quantify the vertical misfits using an optic microscope. The loosening torque for the prosthetic screws was measured 24 hours after the tightening torque (10 Ncm) using a digital torque meter. Data were analyzed by two-way ANOVA and Tukey’s test (α=0.05).

Results:

Overall, dentures with passive fit and Ti screws resulted in significantly higher loosening torque of the prosthetic screws (p<0.05). No significant interaction was found between fit level and screw material (p=0.199). The prosthetic screw material and fit of implant-supported dentures have an influence on screw joint stability. Ti screws presented higher joint stability than Au screws and minimum of misfit should be found clinically to improve the mechanical behavior of the screw joint.

Keywords:: Prosthetic screw, fit, vertical misfit, implant-supported dentures, implant prosthesis, loosening torque, screw joint stability.