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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Sicknan Soares da Rocha [1] ; Fabiane Nogueira [2] ; Anelise Rodolfo Ferreira Pieralini [3] ; Ricardo Faria Ribeiro [4] ; Gelson Luis Adabo [5]
Total Authors: 5
Affiliation:
[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
Total Affiliations: 5
Document type: Journal article
Source: Brazilian Oral Research; v. 24, n. 2, p. 147-152, 2010-06-00.
Abstract

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)

FAPESP's process: 05/03105-1 - Effect of ZrO2 coating on wax pattern before inclusion in phosphate-bonded investment on the fusibility, porosity, surface reaction (a-case) and marginal misfit of crowns cast titanium
Grantee:Gelson Luis Adabo
Support Opportunities: Regular Research Grants