Detalhes bibliográficos
| Ano de defesa: |
2024 |
| Autor(a) principal: |
Suleiman, Abdel Rahim Mohamad Abdel Salam |
| Orientador(a): |
Skupien, Jovito Adiel |
| Banca de defesa: |
Cenci , Tatiane Pereira,
Wandscher , Vinicius Felipe |
| Tipo de documento: |
Dissertação
|
| Tipo de acesso: |
Acesso aberto |
| Idioma: |
por |
| Instituição de defesa: |
Universidade Franciscana
|
| Programa de Pós-Graduação: |
Mestrado em Ciências da Saúde e da Vida
|
| Departamento: |
Ciências da Saúde e da Vida
|
| País: |
Brasil
|
| Palavras-chave em Português: |
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| Palavras-chave em Inglês: |
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| Área do conhecimento CNPq: |
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| Link de acesso: |
http://www.tede.universidadefranciscana.edu.br:8080/handle/UFN-BDTD/1280
|
Resumo: |
Ceramic materials are widely used in restorative dentistry, especially with the advent of metal free rehabilitations. In this context, ceramics based on lithium disilicate stand out for presenting satisfactory optical and mechanical properties. In the clinical environment, wear is often necessary for internal adjustments and/or occlusal contacts of restorations, which are carried out before or after the crystallization stage. However, such wear can lead to defects, which can concentrate stress and, consequently, reduce the material's resistance. Therefore, the objective of the present work is to evaluate the effect of adjustment before and after crystallization on the strength of lithium disilicate for CAD/CAM use. Discs (Ø= 14 mm and 1.2 mm thick) from 4 brands (IPS e.max CAD, T-Lithium CAD, Rosetta SM and Goozir) made of disilicate-based ceramics were made from CAD/CAM blocks and allocated between the experimental groups: POL: no adjustment; PRE: pre-crystallization adjustment; POST: post-crystallization adjustment. Adjustments were carried out in a standardized manner, as well as crystallization and polishing procedures in all groups. After carrying out the treatments, roughness analyzes and biaxial flexural strength tests (piston-on-three-balls) in fatigue were carried out (n= 10). The data were subjected to two-way ANOVA and Tukey's post-hoc test. Except for the Goozir material, the POL groups showed a lower roughness (p< 0.05) than the PRE groups. The POST groups were similar to the POL and PRE groups for all materials, with the exception of the Rosetta material, where the POST was similar to the POL and presented lower roughness than the PRE. Regarding flexural resistance, the POST groups presented lower resistance values compared to the POL and PRE groups (p< 0.05), regardless of the brand tested. Therefore, not making adjustments or using the ceramic adjustment protocol in the pre-crystallized phase presents advantages in relation to the biaxial flexural resistance of the material when compared to a condition of adjustments made after crystallization. |
