| 3484 Photoelastic Analysis Around Implants with Laser Welded and Brazed Frameworks | ||
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E.M.V. COSTA1, M.A. BOTTINO2, D.K.D. VASCONCELLOS2, H. YOSHIDA3, and P.T. NETO3, 1Paulista State University, São José dos Campos, Brazil, 2Universidade Est. Paulista Julio Mesquita, São José dos Campos, Brazil, 3University of São Paulo, Brazil Objective: By photoelastic analysis this study compared the stress pattterns generated around implants installed in a photoelastic model, with passively and nonpassively fitting frameworks Methods: Five standard abutments have been connected to the implants and overthem, framework was made by connecting 3.0mm gold cylinders and sprued, invested, and cast in a gold alloy. From this framework, by the use of addition silicone mould, ten identical frameworks were built. Then the frameworks were sectioned always exactly in the middle between each abutment into five parts by the use of a cutting machine wich has standartized the cut. After the gold screws were tightened (10N/cm)and the metal sections attached with resin, invested, five frameworks were soldered by laser (l group) and five frameworks were soldered by brazing (b group). All the frameworks were tightened (gold screw tightened into abutments with torque of 10n/cm)onto the photoelastic model and evaluated for stress-induced fringes. Each framework was photographed with color film, and distributed stress patterns resulting from the application of force were observed and recorded. Color patterns of internal stress fringes in the photoelastic material indicated the relative magnitude and distribution of stress resulting from the tigthtening forces in each framework/abutment connection. Teh photoelastic stress fringes were analyzed and compared by counting the number of fringes around each implant to identify stress magnitude and to record how close the fringes were to each other for stress concentration.Results:The conection of the brasing frameworks group generated a greatest concentration of stress around the implants seen in the cervical and apical regions. In contrast, when the frameworks of the laser group were analysed by photoelasticity didn`t show adverse stress to the implants.Conclusion: The sectioned and soldered by laser frameworks transfered less stress to the implants than the sectioned and soldered by brazing frameworks after tightening the gold screws. | ||
| Seq #360 - Biomechanics/Implant Surfaces 10:15 AM-11:30 AM, Saturday, 13 March 2004 Hawaii Convention Center Exhibit Hall 1-2 | ||
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