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Analysis of passivity and adaptation of infrastructures Ti laser welding with vertical and horizontal edge, cemented cylinder or process CAD/CAM

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Maíra Daysê Moreira Serra e Silva
Total Authors: 1
Document type: Doctoral Thesis
Press: Piracicaba, SP.
Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Odontologia de Piracicaba
Defense date:
Examining board members:
Rafael Leonardo Xediek Consani; João Neudenir Arioli Filho; Alessandro Ribeiro Gonçalves; Guilherme Elias Pessanha Henriques; Marcelo Ferraz Mesquita
Advisor: Rafael Leonardo Xediek Consani

This study compared different techniques for obtaining prosthetic implantinfrastructures with lower vertical misfits and passivity. Starting from an metallic with plane walls and dimensions of height, length and thickness of 25 X 70 X 10 mm containing four microunits analogues (3.75 X 13 mm), were prepared twentyfive samples were prepared and divided into five groups (n = 5): Group IM onepiece casted frameworks, Group ISS one-piece casted frameworks sectioned and welded with laser welding; Group ICC with cylinders cemented; Group ISB with cylinders laser-welded, Group TCC frameworks fabricated by the CAD/CAM process (Computer Aided Design / Computer Aided Manufacturing). Measurements were accomplished of the frameworks vertical misfit on metal matrix, in an optical microscope with accuracy of 1.0?m and increased 120 X. The Misfits were quantified according to the protocol of the single screw test after 10Ncm torque on the prosthetic screw and verified the adjustment on the other pillars. Aiming to evaluate the passive infrastructure were analyzed by the technique of photoelasticity the tensions generated in the implants after torque of all screws with the aid of a circular polariscope equipped with software able of performing qualitative and quantitative analyzes of tensions. The misfit values and tension were subjected to statistical analysis (SAS version 9.1 - The SAS Institute, Cary, NC, USA). For comparisons between technical and vertical misfit was done with one way - ANOVA and Tukey's test. (? = 0,05%), and for comparisons of fringe orders and shear stress was performed two factors ANOVA and Tukey test (? = 0,05%). The results showed that the IM group showed higher marginal discrepancy; group ISS and ICC showed significant marginal adaptation and lower stress concentration when compared to IM, with the advantage the ICC group of eliminate sectioning and welding; ISB group showed better marginal adaptation in casted frameworks, but with significant concentration fringe and tension in implants and CAD/CAM technology produced frameworks with best average marginal fit and tension. It can be concluded that techniques that reduce or eliminate welding points as ISS, ICC and TCC improves the passivity and reduce vertical misfit of extensive infrastructure supported by implants (AU)

FAPESP's process: 11/09320-2 - Passive fit analysis and vertical mistify of framworks of Ti made by Laser welding vertical and horizontal, lutting cilinder ou CAD/CAM technique
Grantee:Maíra Daysê Moreira Serra e Silva
Support Opportunities: Scholarships in Brazil - Doctorate