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Open AccessArticle

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