Photoelastic analysis of stress transmitted from implant-supported frameworks achieved by cilinders lutingand laser welding techniques before and after eletric discharge machining / Analise fotoelastica das tensões induzidas por infra-estruturas implanto-suportadas obtidas pelas tecnicas de cimentação dos cilindros e soldagem a laser, antes e apos eletroerosão

AUTOR(ES)

Juliana Tamião Barberi

DATA DE PUBLICAÇÃO

2007

RESUMO

The purpose of the study was to evaluate the passive fit of fixed implantsupported prothesis titanium frameworks, through photoelastic stress analysis. Two frameworks welded in commercially pure titanium (Tritan® -Dentaurum -Germany) were fabricated by two methods based on a metal model composed of five analogous Micro-Unit (Conexão -São Paulo): Framework I, abutment-luted with resin-modified glass ionomer luting cement (RelyX® Luting 2 - 3M ESPE); and framework II, cylinders laser-welding technique and was then refined using electric discharge machining. Photoelastic model was obtained (Araldite® GY279BR Huntsman - Araltec Produtos Químicos Ltda. - Garulhos - São Paulo) with five fixtures and abutments Micro-Unit. Strains were produced around the implant bodies when screws retaining the prosthesis were tightened sequence 3,2,4,1,5, and strains were evaluated by photoelastic analysis. The interfacial gaps between the abutments and fixture were measuremented with an optical microscope (STM Digital - Olympus - Japan) 0,0005mm of precision. The interfacial gaps were smaller in the abutment-luted framework (42,37 mm), demonstrated the lower stress when compared to the laser-welded cylinder framework (83,66 mm). The electric discharge machining (EDM) reduced the gaps at the interfaces (53,7 mm) and the strains for framework welded. It may be concluded that the process of abutment-luted realized in frameworks improves the precise fit of it, can be recommended of achieving precise fit of implant-supported prothesis.

ASSUNTO(S)

titanio prostheses and implants titanium proteses e implantes

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