Photoelastic analysis of the distribution of stress in different systems of overdentures on osseous-integrated implants
| Autor: | Mauro Antônio de Arruda Nóbilo, Ana Carolina Masarolo Machado, Leandro Cardoso, William Cunha Brandt, Guilherme Elias Pessanha Henriques |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Oral Implants
Dental Stress Analysis Immediate Dental Implant Loading Bar System Attachment Selection medicine.medical_treatment Bone Reactions Dental Abutments Mandible Intermediate level Stress level Bite Force Denture-Bearing Area Overdenture Retained Overdentures medicine Humans Jaw Edentulous Denture Design Osseointegrated Implant Orthodontics Photoelasticity business.industry Anchorage Systems Epoxy Resins Moderate level Dental Implantation Endosseous Supporting Overdentures General Medicine Stress distribution Denture Overlay Denture Retention Models Dental O'ring Photoelastic Analysis Otorhinolaryngology Load-Transfer In-Vitro Phthalic Anhydrides Mandibular Overdentures Surgery Dental Prosthesis Implant-Supported Prosthodontics business |
| Zdroj: | Web of Science Repositório Institucional da UNITAU Universidade de Taubaté (UNITAU) instacron:UNITAU |
| ISSN: | 1536-3732 |
| Popis: | Made available in DSpace on 2019-09-12T16:53:50Z (GMT). No. of bitstreams: 0 Previous issue date: 2011 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Objective: The aim of this study was to evaluate the distribution of generated stress around implants and adjacent bone tissue using different implant-retained overdenture designs through photoelastic analysis. Methods: Over an edentulous human mandible, achieved from a human model, 2 or 4 microunit analog abutments were embedded (Master; Conexao Systems Prosthodontics, Sao Paulo, Brazil), settled in the interforaminal region. Three models of photoelastic resin (Araltec Chemicals Ltda, Hunstman, Guarulhos, Sao Paulo, Brazil), with 2 or 4 incorporated implants and microunit abutments, were obtained from molds using silicone for duplication. Inclusion, finishing, and polishing procedures were applied on the frameworks. This study was based on 3 different mechanisms of implant-retained mandibular overdentures: O'ring (GI), bar-clip (GII) (both with 2 implants), and their association (GIII) (with 4 implants). After the adaptation of each overdenture system on the photoelastic models, 100-N alternate occlusal loads were applied on back-side and frontside regions. The photoelastic analysis was made with the aid of a plain polariscope linked to a digital camera, Sony Cybershot > 100, which allowed visualization of the fringes and registration of images on digital photographs. Results: The results demonstrated higher tension concentrated over the GIII, with a flat distribution of stress to the posterior ridge and overload on the posterior implants. GI showed the smaller stress level, and GII, intermediate level; there was distribution of stress to the posterior ridge in these 2 groups. Conclusion: The use of bar attachment proved to be a better alternative, because it showed a moderate level of tension with a more uniform stress distribution and possessed higher retention than did the ball system. [Brandt, William Cunha] Universidade de Taubaté (Unitau), Dept Prosthodont, Sch Dent, , BR-12020330 Sao Paulo, Brazil [Masarolo Machado, Ana Carolina; Cardoso, Leandro; Pessanha Henriques, Guilherme Elias; de Arruda Nobilo, Mauro Antonio] Univ Estadual Campinas, Dept Prosthodont & Periodont, Piracicaba Dent Sch, Piracicaba, Brazil |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|