title: Influence of laser-welding and electroerosion on passive fit of implant-supported prosthesis.
abstract: This study investigated the influence of laser welding and electroerosion procedure on the passive fit of interim fixed implant-supported titanium frameworks. Twenty frameworks were made from a master model, with five parallel placed implants in the inter foramen region, and cast in commercially pure titanium. The frameworks were divided into 4 groups: 10 samples were tested before (G1) and after (G2) electroerosion application; and another 10 were sectioned into five pieces and laser welded before (G3) and after (G4) electroerosion application. The passive fit between the UCLA abutment of the framework and the implant was evaluated using an optical microscope Olympus STM (Olympus Optical Co., Tokyo, Japan) with 0.0005mm of accuracy. Statistical analyses showed significant differences between G1 and G2, G1 and G3, G1 and G4, G2 and G4. However, no statistical difference was observed when comparing G2 and G3. These results indicate that frameworks may show a more precise adaptation if they are sectioned and laser welded. In the same way, electroerosion improves the precision in the framework adaptation.
authors.affiliation: Section of Prosthodontics, Department of Restorative Dentistry, Federal University of Santa Maria, Brazil. tabernardon@yahoo.com
authors.forename: Tatiana Bernardon
authors.initials: TB
authors.lastname: Silva
authors.forename: Mauro Antonio
authors.initials: MA
authors.lastname: De Arruda Nobilo
authors.forename: Guilherme Elias
authors.initials: GE
authors.lastname: Pessanha Henriques
authors.forename: Marcelo Ferraz
authors.initials: MF
authors.lastname: Mesquita
authors.forename: Magali Beck
authors.initials: MB
authors.lastname: Guimaraes
mesh_terms: D000044:Dental Abutments; D003764:Dental Materials / Q000737:chemistry; D003775:Dental Polishing; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D012994:Dental Soldering / Q000295:instrumentation / Q000379:methods*; D004572:Electrolysis / Q000379:methods*; D006801:Humans; D007834:Lasers; D008422:Materials Testing; D008853:Microscopy; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry
chemical_list: D003764:Dental Materials; D014025:Titanium