A Study of Temperature Rise in the Pulp Chamber during Composite Polymerization with Different Light-curing Units
Christopher Millen, Martyn Ormond, Gillian Richardson, Ario Santini, Vesna Miletic, Peter kew
Citation Information :
Millen C, Ormond M, Richardson G, Santini A, Miletic V, kew P. A Study of Temperature Rise in the Pulp Chamber during Composite Polymerization with Different Light-curing Units. J Contemp Dent Pract 2007; 8 (7):29-37.
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 mWcm-2 was used and in Group 2, an LED LCU with a light intensity of 1100 mWcm-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°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 occured 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.
Citation
Millen C, Ormond M, Richardson G, Santini A, Miletic V, Kew P. A Study of Temperature Rise in the Pulp Chamber during Composite Polymerization with Different Light-curing Units. J Contemp Dent Pract 2007 November; (8)7:029-037.
Pulp response to externally applied heat. Oral Surg Oral Med Oral Pathol 1965;19(4):515-30.
Heat shock induces the synthesis of the inflammatory mediator leukotriene B4 in human pulp cells. Int Endod J. 2005;38:882-8.
Thermal changes and cure depths associated with a high intensity light activation unit. J Dent. 2004;32(8):643-51.
Temperature rise during polymerization of light-activated resin composites. J Oral Rehabil. 1998;25(12):908-13.
Resin polymerization problems╌are they caused by resin curing lights, resin formulations, or both
Polymerization and light-induced heat of dental composites cured with LED and halogen technology. Biomaterials 2003;24(10):1809-20.
Temperature rise in the pulp chamber induced by a conventional halogen light-curing source and a plasma arc lamp. Am J Dent 2004;17(3):203-8.
Increases in intrapulpal temperature during polymerization of composite resin. J Prosthet Dent 2006;96(5):328-31.
Comparison of temperature changes in the pulp chamber induced by various light curing units, in vitro. Oper Dent 2006;31(2):261-5.
In-vitro pulp chamber temperature rise during composite resin polymerization with various light-curing sources. Dent Mater 1999;15(4):275-81.
Thermal risks from LED- and high-intensity QTH-curing units during polymerization of dental resins. J Biomed Mater Res B Appl Biomater 2005;72(2):260-7.
Influence of light intensity from different curing units upon composite temperature rise. J Oral Rehabil 2005;32(5):362-7.
Temperature rise during adhesive and resin composite polymerization with various light curing sources. Oper Dent 2004;29(3):325-32.
Effect of polymerization modes and resin composite on the temperature rise of human dentin of different thicknesses: an in vitro study. Oper Dent 2005;30(5):602-7.
Thermographic measurement of temperature change during resin composite polymerization in vivo. J Dent 1995;23(5):267-71.
Mapping of tubule and intertubular surface areas available for bonding in Class V and in Class II preparations. J Dent 1997;25:375-89.
Temperature rise produced by various visible light generators through dentinal barriers. J Prosthet Dent 1988;59(4):433-8.
In vitro temperature change at the dentin/pulpal interface by using conventional visible light versus argon laser. Lasers Surg Med 2000;26(4):386-97.
Light energy transmission through cured resin composite and human dentin. Quintessence Int 2000; 31(9): 659-67.
