Journal article
Polymerization of composite resins: argon laser vs conventional light
Operative dentistry, Vol.23(2), pp.87-93
03/1998
PMID: 9573794
Abstract
The purpose of this in vitro study was to compare polymerization of composite resins, as indicated by microhardness, at increasing depths using an argon laser versus a conventional light. For this, a microfill (Silux Plus) and a hybrid (TPH) composite resin were used. Five specimens per group were prepared by injecting composite into a rectangular split Teflon mold 3 x 3 x 8 mm. Specimens were then polymerized by either a 40-second exposure to the conventional visible light (VL) or a 30-, 20-, or 10-second exposure to the argon laser (AL). Specimens were stored in a light-proof container for 24 hours at 37 degrees C, then Knoop hardness was determined. Four measurements were taken for each specimen at depths of 0, 1, 2, 3, and 4 mm from the exposed surface. No significant differences were found in surface hardness for either the microfill or hybrid composite regardless of light source or exposure time. For the microfill composite, at 1, 2, 3, and 4 mm depths, VL40 and AL30 exposures produced comparable hardness, which was significantly greater than that found for AL20 and AL10. At a depth of 4 mm, exposure to VL40 resulted in significantly greater hardness compared to AL20. With AL10 exposure, the composite was too soft to determine hardness. The hybrid composite had comparable hardness to a depth of 3 mm for VL40, AL30 and AL20.
Details
- Title: Subtitle
- Polymerization of composite resins: argon laser vs conventional light
- Creators
- M A Vargas - University of Iowa, College of Dentistry, Department of Operative Dentistry, Iowa City 52242-1001, USAD S CobbJ L Schmit
- Resource Type
- Journal article
- Publication Details
- Operative dentistry, Vol.23(2), pp.87-93
- Publisher
- United States
- PMID
- 9573794
- ISSN
- 0361-7734
- eISSN
- 1559-2863
- Language
- English
- Date published
- 03/1998
- Academic Unit
- Operative Dentistry; Family Dentistry
- Record Identifier
- 9984065977102771
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