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

Brazilian Oral Research
Sicknan Soares RochaGelson Luis Adabo

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 degrees C, 75%/287 degrees C, Castorit Super C (CS)-100%/70 degrees C, 75%/141 degrees C and Rematitan Plus (RP)- 100%/430 degrees 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 (alpha = 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 (alpha = 0.05). The hardness decreased from the surface (601.17 VHN) to 150 microm (204.03 VHN). The group CS 75%/141 degrees 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 mum. The castings made with CS - 100%/70 degrees C presented the lowest levels of marginal misfit, followed by RE -100%/237 degrees C. The conventional investments CS (100%) and RE (100%) showed better marginal fit ...Continue Reading

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Citations

Aug 11, 2009·Dental Materials Journal·Fazal RezaTakashi Miyazaki
May 29, 2012·The Journal of Prosthetic Dentistry·Mari KoikeToru Okabe
Jan 8, 2013·Journal of Prosthodontics : Official Journal of the American College of Prosthodontists·Noor A NawaflehMuhanad M Hatamleh
Jul 7, 2012·The Journal of Prosthetic Dentistry·Anelise Rodolfo Ferreira PieraliniGelson Luis Adabo

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