Effect of phosphate-bonded investments on titanium reaction layer and crown fit
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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.
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Dental alloys, Dental casting investment, Dental casting technique, Dental prosthesis, Titanium, biomedical and dental materials, phosphate, titanium, analysis of variance, chemistry, denture, endodontics, hardness, heat, materials testing, surface property, tooth crown, Analysis of Variance, Crowns, Dental Casting Investment, Dental Casting Technique, Dental Marginal Adaptation, Dental Materials, Hardness Tests, Hot Temperature, Materials Testing, Phosphates, Surface Properties
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Brazilian Oral Research, v. 24, n. 2, p. 147-152, 2010.
