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Increases in intrapulpal temperature during polymerization of composite resin.
Giovana Ribeiro Martins1, Bruno Neves Cavalcanti, Sigmar Mello Rode
1School of Dentistry, Ibirapuera University, Sao Paulo, SP, Brazil.
The Journal of Prosthetic Dentistry
|November 14, 2006
Summary
Argon lasers generate lower intrapulpal temperature increases during dental composite polymerization than halogen lights. Both light sources remained below the 5.5°C safe limit for pulp damage.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Conservative Dentistry
Background:
- Dental composite resin polymerization can elevate intrapulpal temperature, potentially harming the dental pulp.
- New polymerization devices like argon lasers necessitate evaluating their thermal effects.
Purpose of the Study:
- To compare temperature increases from argon laser versus halogen light polymerization of dental bonding systems and composite resins.
- To determine if these lights generate temperature rises below the critical 5.5°C threshold for pulp safety.
Main Methods:
- Thermocouples measured temperature changes in the pulp chamber of bovine incisors.
- Class V cavities were restored with a bonding system and composite resin.
- Groups included halogen light (bonding/composite) and argon laser (bonding/composite) polymerization.
Main Results:
- Average temperature increases: Halogen light (2.35-2.69°C), Argon laser (1.25-1.5°C).
- Argon laser groups showed significantly lower temperature increases than halogen light groups (P = .002).
- No significant difference in temperature increase was found between bonding systems and composite resins.
Conclusions:
- Argon laser polymerization results in significantly less pulpal temperature increase compared to halogen light.
- The observed temperature increases with both light sources were below the 5.5°C safety limit.
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