Marcelo Coelho Goiato1, Alves Aldiéris Pesqueira2, Daniela Micheline Dos Santos3, Marcela Filié Haddad4, Amália Moreno5. 1. Adjunct Professor, Department of Dental Materials and Prosthodontics, Araçatuba School of Dentistry, São Paulo State University -UNESP, Araçatuba, São Paulo, Brazil . 2. Associate Professor, Department of Dental Materials and Prosthodontics, Araçatuba School of Dentistry, São Paulo State University-UNESP , Araçatuba, São Paulo, Brazil . 3. Associate Professor, Department of Dental Materials and Prosthodontics, Araçatuba Dental School, UNESP , Araçatuba, São Paulo, Brazil . 4. Adjunct Professor, Federal University of Department of Dental Materials and Prosthodontics , Alfenas - UNIFAL . 5. Post-Graduate Student, Department of Dental Materials and Prosthodontics, Araçatuba School of Dentistry, São Paulo State University-UNESP , Araçatuba, São Paulo, Brazil .
Abstract
PURPOSE: This study investigated the biomechanical behavior of screwed partial fixed prosthesis supported by implants with different diameters (2.5 mm; 3.3 mm and 3.75 mm) by using a photoelastic analysis. MATERIALS AND METHODS: Six photoelastic models were fabricated in PL-2 resin as single crowns or splinted 3-unit piece. Models were positioned in a circular polariscope and 100-N axial and oblique (45 degrees) loads were applied in the occlusal surface of the crowns by using a universal testing machine (EMIC). The stresses were photographically recorded and qualitatively analyzed using a software (Adobe Photoshop). RESULTS: Under axial loading, the number of fringes was inversely proportional to the diameter of the implants in the single crown models. In the splinted 3-unit piece, the 3.75-mm implant promoted lower number of fringes regardless of loading area application. Under oblique loading, a slight increase of fringes number was observed for all groups. CONCLUSION: The standard implant diameter promoted better stress distribution than the narrow and mini diameter implants. Additionally, the splinted crowns showed a more uniform stress distribution.
PURPOSE: This study investigated the biomechanical behavior of screwed partial fixed prosthesis supported by implants with different diameters (2.5 mm; 3.3 mm and 3.75 mm) by using a photoelastic analysis. MATERIALS AND METHODS: Six photoelastic models were fabricated in PL-2 resin as single crowns or splinted 3-unit piece. Models were positioned in a circular polariscope and 100-N axial and oblique (45 degrees) loads were applied in the occlusal surface of the crowns by using a universal testing machine (EMIC). The stresses were photographically recorded and qualitatively analyzed using a software (Adobe Photoshop). RESULTS: Under axial loading, the number of fringes was inversely proportional to the diameter of the implants in the single crown models. In the splinted 3-unit piece, the 3.75-mm implant promoted lower number of fringes regardless of loading area application. Under oblique loading, a slight increase of fringes number was observed for all groups. CONCLUSION: The standard implant diameter promoted better stress distribution than the narrow and mini diameter implants. Additionally, the splinted crowns showed a more uniform stress distribution.
Authors: Michael S Reddy; S Jean O'Neal; Sandra Haigh; Ruth Aponte-Wesson; Nico C Geurs Journal: Int J Oral Maxillofac Implants Date: 2008 Mar-Apr Impact factor: 2.804