Temperature changes under demineralized dentin during polymerization of three resin-based restorative materials using QTH and LED units
Mousavinasab Sayed-Mostafa, Khoroushi Maryam, Moharreri Mohammadreza, Atai Mohammad,
소속 상세정보
( Mousavinasab Sayed-Mostafa ) - Isfahan University of Medical Sciences School of Dentistry Department of Operative Dentistry
( Khoroushi Maryam ) - Isfahan University of Medical Sciences School of Dentistry Department of Operative Dentistry Dental Materials Research Center
( Moharreri Mohammadreza ) - Isfahan University of Medical Sciences School of Dentistry Department of Operative Dentistry
( Atai Mohammad ) - Iran Polymer and Petrochemical Institute
KMID : 1034420140390030155
Abstract
Objectives: Light-curing of resin-based materials (RBMs) increases the pulp chamber temperature, with detrimental effects on the vital pulp. This in vitro study compared the temperature rise under demineralized human tooth dentin during light-curing and the degrees of conversion (DCs) of three different RBMs using quartz tungsten halogen (QTH) and light-emitting diode (LED) units (LCUs).
Materials and Methods: Demineralized and non-demineralized dentin disks were prepared from 120 extracted human mandibular molars. The temperature rise under the dentin disks (n = 12) during the light-curing of three RBMs, i.e. an Ormocer-based composite resin (Ceram. X, Dentsply DeTrey), a low-shrinkage silorane-based composite (Filtek P90, 3M ESPE), and a giomer (Beautifil II, Shofu GmbH), was measured with a K-type thermocouple wire. The DCs of the materials were investigated using Fourier transform infrared spectroscopy.
Results: The temperature rise under the demineralized dentin disks was higher than that under the non-demineralized dentin disks during the polymerization of all restorative materials (p < 0.05). Filtek P90 induced higher temperature rise during polymerization than Ceram.X and Beautifil II under demineralized dentin (p < 0.05). The temperature rise under demineralized dentin during Filtek P90 polymerization exceeded the threshold value (5.5℃), with no significant differences between the DCs of the test materials (p > 0.05).
Conclusions: Although there were no significant differences in the DCs, the temperature rise under demineralized dentin disks for the silorane-based composite was higher than that for dimethacrylate-based restorative materials, particularly with QTH LCU.
키워드
Degree of conversion; Demineralization; Dentin; Light-curing unit; Light polymerization; Temperature rise
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