Effect of phosphate-bonded investments on titanium reaction layer and crown fit

Autor(es)

Sicknan Soares da Rocha ^[1] ; Fabiane Nogueira ^[2] ; Anelise Rodolfo Ferreira Pieralini ^[3] ; Ricardo Faria Ribeiro ^[4] ; Gelson Luis Adabo ^[5]

Afiliação do(s) autor(es)

^[1] Federal University of Goiás, Goiânia. Department of Prevention and Oral Rehabilitation. Dental Clinic - Brasil

^[2] Univ Estadual Paulista. Faculdade de Odontologia de Araraquara. Department of Dental Materials and Prosthodontics - Brasil

^[3] Univ Estadual Paulista. Faculdade de Odontologia de Araraquara. Department of Dental Materials and Prosthodontics - Brasil

^[4] University of São Paulo. School of Dentistry of Ribeirão Preto. Department of Dental Materials and Prosthodontics - Brasil

^[5] Univ Estadual Paulista. Faculdade de Odontologia de Araraquara. Department of Dental Materials and Prosthodontics - Brasil

• Tipo de documento: Artigo Científico
• Fonte: Brazilian Oral Research; v. 24, n. 2, p. 147-152, 2010-06-00.

Resumo

This study analyzed the reaction layer and measured the marginal crown fit of cast titanium applied to different phosphate-bonded investments, prepared under the following conditions (liquid concentration/casting temperature): Rema Exakt (RE) - 100%/237°C, 75%/287°C, Castorit Super C (CS)-100%/70°C, 75%/141°C and Rematitan Plus (RP)- 100%/430°C (special to titanium cast, as the control group). The reaction layer was studied using the Vickers hardness test, and analyzed by two way ANOVA and Tukey's HSD tests (α = 0.05). Digital photographs were taken of the crowns seated on the die, the misfit was measured using an image analysis system and One-way ANOVA, and Tukey's test was applied (α = 0.05). The hardness decreased from the surface (601.17 VHN) to 150 μm (204.03 VHN). The group CS 75%/141°C presented higher hardness than the other groups, revealing higher surface contamination, but there were no differences among the groups at measurements deeper than 150 μm. The castings made with CS - 100%/70°C presented the lowest levels of marginal misfit, followed by RE -100%/237°C. The conventional investments CS (100%) and RE (100%) showed better marginal fit than RP, but the CS (75%) had higher surface contamination. (AU)

• Processo FAPESP: 05/03105-1 - Efeito da cobertura do padrão de cera com ZrO2, previamente à inclusão em revestimentos fosfatados sobre a fluidez, a porosidade, a camada de reação (a-case) e desajuste marginal de coroas em titânio fundido
• Beneficiário: Gelson Luis Adabo
• Modalidade de apoio: Auxílio à Pesquisa - Regular