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Changes in surface contour of resin composites after light-curing
1Department of Dental Biomaterials Science and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea. ykleedm@snu.ac.kr
American Journal of Dentistry
|June 27, 2008
Summary
Light-curing resin composites causes surface contour changes and volume alterations. These changes depend on the distance from the irradiated area and the specific resin composite brand used.
Area of Science:
- Dental Materials Science
- Polymer Chemistry
- Biomaterials Engineering
Background:
- Light-curing is essential for dental resin composites.
- Understanding polymerization shrinkage and surface deformation is crucial for clinical success.
- Previous studies have focused on bulk properties, but surface contour changes require detailed investigation.
Purpose of the Study:
- To quantify the free surface contour and volume changes in resin composites during light-curing.
- To analyze these changes using a 3-dimensional profilometer after irradiating half of the specimen area.
- To assess the influence of distance from the irradiated margin and resin composite brand on these deformations.
Main Methods:
- Resin composite specimens were prepared in a metal mold and light-cured on half the surface area for 40 seconds.
- A 3-dimensional profilometer was used to scan the upper surface profile of the cured specimens.
- Surface contour changes were measured as height relative to the non-irradiated margin, and elevated volume was calculated.
Main Results:
- Surface height decreased from the irradiated margin towards the non-irradiated margin.
- Contour changes were significantly influenced by distance from irradiation and resin composite brand (P<0.05).
- Irradiated margin height ranged from 113.2-212.4 micrometers, with total volume changes of 8.87-17.27x10^6 μm³.
Conclusions:
- Light-curing induces significant free surface contour and volume changes in resin composites.
- The pattern of deformation is consistent across different brands, but the magnitude varies.
- These findings highlight the importance of considering material-specific responses to light-curing in dental applications.
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