In vitro pulp chamber temperature rise during composite resin polymerization with different curing lights

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Restorative Dentistry

Background:

• Light-activated resin composites are crucial for aesthetic restorative dentistry.
• Polymerization of these materials generates heat through exothermic reactions and absorbed energy.
• Elevated temperatures can adversely affect dental pulp tissue.

Purpose of the Study:

• To quantify the increase in pulp chamber temperature during composite resin polymerization.
• To evaluate temperature changes induced by various light curing units.
• To assess these thermal effects in three common clinical scenarios: Veneer, Class II, and Class III restorations.

Main Methods:

• An in vitro study design was employed.
• Pulp temperature changes were measured using an Aluminum-Chromium (Al-Cr) Thermocouple.
• The thermocouple was precisely positioned at the pulp-dentin junction.
• Measurements were taken during composite resin polymerization with different light curing units in simulated clinical situations.
• Mean temperature values were calculated from six replicate measurements for each condition.

Main Results:

• Significant temperature increases were observed in the pulp chamber during composite resin polymerization.
• The magnitude of temperature rise varied depending on the light curing unit used and the clinical situation simulated.
• Specific data on temperature increments for Veneer, Class II, and Class III restorations were recorded.

Conclusions:

• The study highlights the potential thermal risk to dental pulp during light-activated composite resin polymerization.
• Findings underscore the importance of considering light curing unit parameters and clinical application when managing pulp temperature.
• Clinical implications suggest the need for strategies to mitigate heat generation and protect pulp tissue during restorative procedures.