ORIGINAL ARTICLE

 

Porcelain application and simulation of firing cycle: effect on marginal misfit of implant-supported frameworks

 

 

Márcia Mika Nakaoka^I; Jessica Mie Ferreira Koyama Takahashi^II; Juliana Maria Costa Nuñez-Pantoja^II; Rafael Leonardo Xediek Consani^III; Marcelo Ferraz Mesquita^III

^IDDS, MS, PhD, Dentistry School, São Lucas College, Porto Velho, RO, Brazil
^IIDDS, MS, Department of Prosthodontics and Periodontology Piracicaba Dental School State University of Campinas, Piracicaba, SP, Brazil
^IIIDDS, MS, PhD, Department of Prosthodontics and Periodontology Piracicaba Dental School State University of Campinas, Piracicaba, SP, Brazil

Correspondence to

 

 

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ABSTRACT

AIM: Success of implant-supported prostheses is related to the frameworks' passive fit, hence inaccuracies can generate stress, leading to bone resorption and rehabilitation failure. This study evaluated misfit levels of implant-supported frameworks after different coverage treatments.
METHODS: Twenty commercially pure titanium (CP Ti) frameworks were manufactured with 5 Branemark type multi-unit abutments. Frameworks were distributed in two groups as follows: G1 - porcelain application (n=10); G2 - porcelain firing cycle simulation (n=10). Using a traveling microscope, marginal misfit was measured before and after undertaking the techniques, following the single-screw test protocol. All data were submitted to ANOVA and Tukey's test (p<0.05).
RESULTS: Initial marginal misfit values were not significantly different, but both groups presented significantly higher misfit values after treatment: G1: 233.99 µm (p=0.0003); G2: 119.75 µm (p<0.0001). In addition, G1 presented higher misfit than G2 (p<0.0001).
CONCLUSIONS: Porcelain application promoted significantly higher increase of misfit, which indicates that such procedure should be considered on misfit analysis of implant-supported prostheses.

Keywords: implant-supported prosthesis, prosthesis fitting, esthetic coverage, titanium framework.

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Acknowledgements

This research was supported by FAPESP (grant 2004/13629-5).

 

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Correspondence to:
Jessica Mie Ferreira Koyama Takahashi
Rua Luíz Razera 300 ap44DR
Nova América - 13417-530
Piracicaba, SãoPaulo - Brasil
e-mail: jemfkt@yahoo.com.br

Received for publication: April 14, 2010
Accepted: July 06, 2010