Effect of tree types of light-curing units on 5-year colour changes of light-cured composite.
- Resource Type
- Article
- Authors
- Tak, Onjen; Altintas, Subutay Han; Ozturk, Nilgun; Usumez, Aslihan
- Source
- Clinical Oral Investigations. Mar2009, Vol. 13 Issue 1, p29-35. 7p. 3 Charts.
- Subject
- *LIGHT emitting diodes
*COMPOSITE materials
*CALORIMETRY
*CURING
*TUNGSTEN
- Language
- ISSN
- 1432-6981
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°C in 100% humidity. Colorimetric values of the specimens immediately after curing and after 5 years were measured using colorimeter. The Δ E* 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. [ABSTRACT FROM AUTHOR]