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Temperature changes under demineralized dentin during polymerization of three resin-based restorative materials using QTH and LED units.

Mousavinasab SM, Khoroushi M, Moharreri M, Atai M - Restor Dent Endod (2014)

Bottom Line: Light-curing of resin-based materials (RBMs) increases the pulp chamber temperature, with detrimental effects on the vital pulp.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).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.

View Article: PubMed Central - PubMed

Affiliation: Torabinejad Dental Research Center and Department of Operative Dentistry, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.

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.

No MeSH data available.


Schematic representation of the different steps for the preparation of dentinal discs. LCU, light-curing unit; QTH, quartz tungsten halogen; LED, light-emitting diode.
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Figure 1: Schematic representation of the different steps for the preparation of dentinal discs. LCU, light-curing unit; QTH, quartz tungsten halogen; LED, light-emitting diode.

Mentions: Dentin disks with a thickness of 1.5 mm and a diameter of 4 mm were prepared from the deep dentin of 120 third molars. To this end, each tooth was mounted in epoxy resin (Triplex Acryl, Ivoclar Vivadent, Schaan, Liechtenstein) and sections parallel to the long axis of each tooth were cut using a low-speed diamond saw (SERVOCUT 301MA, Kemet International Ltd., Maidstone, UK) under water spray. Subsequently, perpendicular cuts were made for preparing dentin disks with a thickness of 1.5 mm (Figure 1). Dentin sample surfaces were wet-ground with 320- and 400-grit silicon carbide abrasive papers under water spray for achieving flat dentin surfaces.


Temperature changes under demineralized dentin during polymerization of three resin-based restorative materials using QTH and LED units.

Mousavinasab SM, Khoroushi M, Moharreri M, Atai M - Restor Dent Endod (2014)

Schematic representation of the different steps for the preparation of dentinal discs. LCU, light-curing unit; QTH, quartz tungsten halogen; LED, light-emitting diode.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4125578&req=5

Figure 1: Schematic representation of the different steps for the preparation of dentinal discs. LCU, light-curing unit; QTH, quartz tungsten halogen; LED, light-emitting diode.
Mentions: Dentin disks with a thickness of 1.5 mm and a diameter of 4 mm were prepared from the deep dentin of 120 third molars. To this end, each tooth was mounted in epoxy resin (Triplex Acryl, Ivoclar Vivadent, Schaan, Liechtenstein) and sections parallel to the long axis of each tooth were cut using a low-speed diamond saw (SERVOCUT 301MA, Kemet International Ltd., Maidstone, UK) under water spray. Subsequently, perpendicular cuts were made for preparing dentin disks with a thickness of 1.5 mm (Figure 1). Dentin sample surfaces were wet-ground with 320- and 400-grit silicon carbide abrasive papers under water spray for achieving flat dentin surfaces.

Bottom Line: Light-curing of resin-based materials (RBMs) increases the pulp chamber temperature, with detrimental effects on the vital pulp.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).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.

View Article: PubMed Central - PubMed

Affiliation: Torabinejad Dental Research Center and Department of Operative Dentistry, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.

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.

No MeSH data available.