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Materials 2015, 8(4), 1766-1777; doi:10.3390/ma8041766

Effect of Heat Treatment on the Physical Properties of Provisional Crowns during Polymerization: An in Vitro Study

1
Faculty of Dentistry, the University of Hong Kong, Hong Kong, China
2
Schools of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China
*
Author to whom correspondence should be addressed.
Academic Editor: Ihtesham ur Rehman
Received: 12 December 2014 / Revised: 2 April 2015 / Accepted: 7 April 2015 / Published: 15 April 2015
(This article belongs to the Special Issue Dental Materials)
View Full-Text   |   Download PDF [1980 KB, uploaded 15 April 2015]   |  

Abstract

This study concerned the effect of heat treatment during setting on the physical properties of four resin-based provisional restorative materials: Duralay (polymethyl methacrylate), Trim II (polyethyl methacrylate), Luxatemp (bis-acrylic composite), and Protemp 4 (bis-acrylic composite). Specimens were prepared at 23, 37, or 60 °C for evaluation of flexural strength, surface roughness, color change and marginal discrepancy. Flexural strength was determined by a three-point bending test. Surface profile was studied using atomic force microscopy. Color change was evaluated by comparing the color of the materials before and after placement in coffee. A travelling microscope helped prepare standardized crowns for assessment of marginal discrepancy. Flexural strength of all tested materials cured at 23 °C or 37 °C did not significantly change. The surface roughness and marginal discrepancy of the materials increased at 60 °C curing temperature. Marginal discrepancies, color stability, and other physical properties of materials cured at 23 °C or 37 °C did not significantly change. Flexural strength of certain provisional materials cured at 60 °C increased, but there was also an increase in surface roughness and marginal discrepancy. View Full-Text
Keywords: methacrylate resin; composite; provisional crown; heat treatment; flexural strength; marginal discrepancy; color stability; surface topography methacrylate resin; composite; provisional crown; heat treatment; flexural strength; marginal discrepancy; color stability; surface topography
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Mei, M.L.; So, S.Y.C.; Li, H.; Chu, C.-H. Effect of Heat Treatment on the Physical Properties of Provisional Crowns during Polymerization: An in Vitro Study. Materials 2015, 8, 1766-1777.

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