Effect of phosphate-bonded investments on titanium reaction layer and crown fit
Braz. oral res
;
24(2): 147-152, Apr.-June 2010. tab
Article
in English
| LILACS
| ID: lil-553900
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 percent/237°C, 75 percent/287°C, Castorit Super C (CS)-100 percent/70°C, 75 percent/141°C and Rematitan Plus (RP)- 100 percent/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 (á = 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 (á = 0.05). The hardness decreased from the surface (601.17 VHN) to 150 ìm (204.03 VHN). The group CS 75 percent/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 ìm. The castings made with CS - 100 percent/70°C presented the lowest levels of marginal misfit, followed by RE -100 percent/237°C. The conventional investments CS (100 percent) and RE (100 percent) showed better marginal fit than RP, but the CS (75 percent) had higher surface contamination.
Full text:
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Index:
LILACS (Americas)
Main subject:
Phosphates
/
Titanium
/
Dental Marginal Adaptation
/
Crowns
/
Dental Casting Investment
Language:
English
Journal:
Braz. oral res
Journal subject:
Dentistry
Year:
2010
Type:
Article
/
Project document
Affiliation country:
Brazil
Institution/Affiliation country:
Federal University of Goiás, Goiânia/BR
/
Universidade Estadual Paulista/BR
/
University of São Paulo/BR
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