Full text
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| Author(s): |
Fábio Afrânio de Aguiar Junior
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Ribeirão Preto. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Odontologia de Ribeirão Preto (PCARP/BC) |
| Defense date: | 2010-01-22 |
| Examining board members: |
Renata Cristina Silveira Rodrigues Ferracioli;
Ricardo Faria Ribeiro;
Ivete Aparecida de Mattias Sartori
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| Advisor: | Renata Cristina Silveira Rodrigues Ferracioli |
| Abstract | |
Osseointegrated implants have been successfully used to restore function and esthetic to fully and partially edentulous patients; however, regardless of the high success, the literature reveals some complications of the technique. Despite the lack of consensus about what is the better way to restore multiple adjacent implants, the use of single crowns have been suggested and practiced by many professionals. The purpose of the present study was to verify, using photoelastic analysis (qualitative and quantitative), the biomechanical behavior of single crowns on internal hexagon implants with UCLA abutment. Cement and screw-retained crowns was fabricated simulating the rehabilitation of posterior mandible area with or without the presence of a dental element distal to the implants. The metal framework alloys (Ni-Cr-Ti or Ni- Cr) and the esthetic veneering materials (ceramic or resin) was, also, analyzed. Photoelastic models were made simulating the missing of the second pre-molar and the first molar, rehabilitated with implant-supported crowns. Three models of loading application tips were used to produce different conditions of loading on crowns occlusal surface: 1 punctiform obtained with a simple tip for loading over premolar or molar with 5 Kgf; 2 simultaneous punctiform obtained with a Double tip for loading over both crowns in the same time with 10 Kgf; 3 distributed occlusal obtained with a tip simulating the antagonist occlusion with 10 Kgf. After loading application photographic records were obtained for qualitative analysis, and in sequence, quantitative analysis was realized in three cervical points and one point in the apical area of each implant. According to the obtained results, it was concluded that the use of Ni-Cr-Ti or Ni-Cr alloys did not interfere in stress transmission. Resin veneered crowns, generally generated higher concentration of stress around the implants when compared to ceramic veneered crowns. Screw-retained crowns promoted higher stress around the implants when compared to cement-retained crowns. The presence of teeth with effective interproximal contact distal to implantsupported crowns improved the stress distribution. (AU) | |
| FAPESP's process: | 08/06960-8 - Photoelastic stress analysis for internal hex connection implants/UCLA abutments under static occlusal loading schemes. |
| Grantee: | Fabio Afrânio de Aguiar Junior |
| Support Opportunities: | Scholarships in Brazil - Master |