Effect of three types of light-curing units on 5-year colour changes of light-cured composite.

Abstract

The purpose of this study was to determine colour changes in a composite cured with tungsten-halogen, light-emitting diode (LED) or a plasma arc after 5 years. Five specimens 10 mm in diameter and 2 mm in height were prepared using Hybrid (Clearfil AP-X) composite for each test group. The corresponding specimens were cured with a tungsten-halogen curing light, a LED unit or with a plasma arc. Specimens were stored in light-proof boxes for 5 years after the curing procedure to avoid further exposure to light and stored in 37 degrees C in 100% humidity. Colorimetric values of the specimens immediately after curing and after 5 years were measured using colorimeter. The DeltaE*( ab ) values varied significantly depending on the curing unit used (p < 0.001). Curing time did not affect the colour changes of the specimens (p = 0.4). The results of this study suggest that composite materials undergo measurable changes due to the curing unit exposure.

• Authors: Onjen Tak, Subutay Han Altintas, Nilgun Ozturk, Aslihan Usumez
• Journal: Clinical oral investigations (Clin Oral Investig) Vol. 13 Issue 1 Pg. 29-35 (Mar 2009) ISSN: 1436-3771 [Electronic] Germany
• PMID: 18769947 (Publication Type: Journal Article)

Chemical References

• Clearfil AP-X
• Composite Resins
• Dental Materials
• Methacrylates
• Resin Cements

Topics

• Color
• Colorimetry
• Composite Resins (chemistry, radiation effects)
• Curing Lights, Dental (classification)
• Dental Materials (chemistry, radiation effects)
• Equipment Design
• Humans
• Humidity
• Materials Testing
• Methacrylates (chemistry, radiation effects)
• Radiation Dosage
• Resin Cements (chemistry, radiation effects)
• Surface Properties
• Temperature
• Time Factors