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Monomer Conversion of Pre-heated Composite

¹ Department of Dental Materials, School of Dentistry, University of São Paulo, São Paulo, SP, Brazil;
² Dental Materials Section, Department of Oral Rehabilitation, School of Dentistry, Medical College of Georgia, Augusta, GA 30912-1260, USA; and
³ Department of Restorative Dentistry, Dental School of Piracicaba at UNICAMP, Piracicaba, SP, Brazil;

^* corresponding author, frueggeb{at}mcg.edu

The potential for maximizing conversion of room-temperature, photoactivated resin composite in the oral environment is limited. Pre-heating composite prior to light-curing is hypothesized to increase monomer conversion and reduce the duration of light exposure. Composite temperature was controlled at between 3°C and 60°C prior to exposure with a conventional quartz-tungsten-halogen curing unit: 5, 10, 20, or 40 sec. Monomer conversion was calculated from infrared spectra at 0 mm (top) and 2-mm-deep surfaces 5 min after light initiation. A strong, positive correlation existed between temperature and monomer conversion: top r² = 0.999, 2 mm r² = 0.998. Conversion ranged from 31.6% (3°C) to 67.3% (60°C). The duration of light exposure, reduced by 50 to 75% with pre-heated composite, yielded the same or significantly higher conversion (p = 0.001) than with control (22°C, 20 sec). Both hypotheses were accepted: Pre-heating composite prior to photoactivation provides greater conversion requiring reduced light exposure than with room-temperature composite.

KEY WORDS: resin composite • monomer conversion • curing temperature • light exposure duration

This article has been cited by other articles:

				M. Daronch, F.A. Rueggeberg, M.F. De Goes, and R. Giudici Polymerization Kinetics of Pre-heated Composite J. Dent. Res., January 1, 2006; 85(1): 38 - 43. [Abstract] [Full Text] [PDF]