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Temperature rise during adhesive and resin composite polymerization with various light curing sources
Bora Ozturk1, A Nilgun Ozturk, Aslihan Usumez
1Department of Restorative Dentistry, Selcuk University, Faculty of Dentistry, Konya, Turkey. bozturk@selcuk.edu.tr
Operative Dentistry
|June 16, 2004
Summary
High-energy light sources like Plasma Arc Curing and High Intensity Quartz Tungsten Halogen caused greater temperature rises during dental adhesive and composite photopolymerization than LED and Quartz Tungsten Halogen. However, all tested conditions remained below the critical 5.6°C threshold for pulpal health.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Polymer Chemistry
Background:
- Dental light-curing units are essential for polymerizing dental adhesives and composites.
- Understanding the thermal effects of different light sources on dental restorations is crucial for preventing pulpal damage.
- Previous research has indicated that various light sources can induce temperature increases during polymerization.
Purpose of the Study:
- To evaluate and compare the temperature rise generated by four different light sources (LED, PAC, HQTH, QTH) during the photopolymerization of two dental adhesive systems (Clearfil SE Bond and EBS-Multi) and two composite systems (Clearfil AP-X and Pertac II).
Main Methods:
- Forty dentin disks from extracted premolars were prepared and placed in a custom apparatus for temperature measurement.
- Temperature rise was recorded during the photopolymerization of adhesive resins and resin composites using LED, PAC, HQTH, and QTH light sources.
- Statistical analysis was performed to compare the temperature increases between different light sources and material types.
Main Results:
- No significant difference in mean temperature increase was found between adhesive and resin composite materials (p=0.769).
- The highest temperature rises were observed with Plasma Arc Curing (PAC) and High Intensity Quartz Tungsten Halogen (HQTH) light sources.
- Quartz Tungsten Halogen (QTH) and Light-Emitting Diode (LED) sources produced significantly lower temperature rises compared to PAC and HQTH, with LED showing the lowest overall increase.
Conclusions:
- High-energy output light sources (PAC and HQTH) generate significantly higher temperatures during dental material photopolymerization than lower-energy sources (QTH and LED).
- Despite variations in temperature rise, all tested light sources and materials, under a 1-mm dentin thickness, produced temperature increases below the critical 5.6°C threshold, indicating safety for pulpal health.