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Type: Artigo de periódico
Title: Monomer conversion of pre-heated composite
Author: Daronch, M
Rueggeberg, FA
De Goes, MF
Abstract: 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 degrees C and 60 degrees 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 r(2) = 0.999, 2 mm r(2) = 0.998. Conversion ranged from 31.6% ( 3 degrees C) to 67.3% ( 60 degrees 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 degrees 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.
Subject: resin composite
monomer conversion
curing temperature
light exposure duration
Country: EUA
Editor: Int Amer Assoc Dental Researchi A D R/a A D R
Rights: fechado
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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