A study of temperature rise in the pulp chamber during composite polymerization with different light-curing units

J Contemp Dent Pract. 2007 Nov 1;8(7):29-37.


Aim: The study compared pulp temperature rise during polymerization of resin-based composites (RBCs) using halogen and LED light-curing units (LCUs).

Methods and materials: A total of 32 teeth extracted from patients aged 11-18 years were used in the study. Thermocouples placed on the roof of the pulp chamber using a novel 'split-tooth' method. In Group 1 a halogen LCU with a light intensity of 450 mW cm(-2) was used and in Group 2, an LED LCU with a light intensity of 1100 mW cm(-2) was used. The teeth were placed in a water bath with the temperature regulated until both the pulp temperature and the ambient temperature were stable at 37 degrees C. Continuous temperature records were made via a data logger and computer. The increase in temperature from baseline to maximum was calculated for each specimen during the curing of both the bonding agent and the RBC.

Results: The rise in pulp temperature was significantly higher with the LED LCU than with the halogen LCU for bonding and RBC curing (p<0.05). The major rise in temperature occurred during the curing of the bonding agent. During the curing of the RBC, rises were smaller.

Conclusions: Curing of bonding agents should be done with low intensity light and high intensity used only for curing RBC regardless of whether LED or halogen LCUs are used.

Publication types

  • Comparative Study

MeSH terms

  • Adolescent
  • Body Temperature*
  • Child
  • Composite Resins / radiation effects
  • Dental Equipment
  • Dental Pulp Cavity / physiology*
  • Halogens
  • Histocytological Preparation Techniques
  • Humans
  • Light*
  • Molar
  • Phase Transition
  • Pilot Projects
  • Resin Cements / radiation effects
  • Semiconductors


  • Composite Resins
  • Halogens
  • Resin Cements