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




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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

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





Autor: May L. Mei 1, Sam Y. C. So 1, Hao Li 2 and Chun-Hung Chu 1,*

Fuente: http://mdpi.com/



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