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http://dx.doi.org/10.4047/jap.2012.4.2.89

Prosthetic misfit of implant-supported prosthesis obtained by an alternative section method  

Tiossi, Rodrigo (Department of Dental Materials and Prosthodontics, Dental School of Ribeirao Preto, University of Sao Paulo)
Falcao-Filho, Hilmo Barreto Leite (Department of Occlusion and Prosthodontics, Dental School of Sobral, University of Ceara)
De Aguiar, Fabio Afranio Junior (Department of Dental Materials and Prosthodontics, Dental School of Ribeirao Preto, University of Sao Paulo)
Rodrigues, Renata Cristina Silveira (Department of Dental Materials and Prosthodontics, Dental School of Ribeirao Preto, University of Sao Paulo)
De Mattos, Maria da Gloria Chiarello (Department of Dental Materials and Prosthodontics, Dental School of Ribeirao Preto, University of Sao Paulo)
Ribeiro, Ricardo Faria (Department of Dental Materials and Prosthodontics, Dental School of Ribeirao Preto, University of Sao Paulo)
Publication Information
The Journal of Advanced Prosthodontics / v.4, no.2, 2012 , pp. 89-92 More about this Journal
Abstract
PURPOSE. Adequate passive-fitting of one-piece cast 3-element implant-supported frameworks is hard to achieve. This short communication aims to present an alternative method for section of one-piece cast frameworks and for casting implant-supported frameworks. MATERIALS AND METHODS. Three-unit implant-supported nickel-chromium (Ni-Cr) frameworks were tested for vertical misfit (n = 6). The frameworks were cast as one-piece (Group A) and later transversally sectioned through a diagonal axis (Group B) and compared to frameworks that were cast diagonally separated (Group C). All separated frameworks were laser welded. Only one side of the frameworks was screwed. RESULTS. The results on the tightened side were significantly lower in Group C ($6.43{\pm}3.24{\mu}m$) when compared to Groups A ($16.50{\pm}7.55{\mu}m$) and B ($16.27{\pm}1.71{\mu}m$) ($P$ <.05). On the opposite side, the diagonal section of the one-piece castings for laser welding showed significant improvement in the levels of misfit of the frameworks (Group A, $58.66{\pm}14.30{\mu}m$; Group B, $39.48{\pm}12.03{\mu}m$; Group C, $23.13{\pm}8.24{\mu}m$) ($P$ <.05). CONCLUSION. Casting diagonally sectioned frameworks lowers the misfit levels. Lower misfit levels for the frameworks can be achieved by diagonally sectioning one-piece frameworks.
Keywords
Dental implants; Implant-supported dental prosthesis; Prosthesis fitting; Prosthodontics; Fixed partial denture; Dental soldering;
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