The Journal of Contemporary Dental Practice

Register      Login



Volume / Issue

Online First

Related articles

VOLUME 8 , ISSUE 7 ( November, 2007 ) > List of Articles


Temperature Rise Produced by Different Light-curing Units through Dentin

A. Rüya Yazici, Gerard Kugel, Ali Müftü

Citation Information : Yazici AR, Kugel G, Müftü A. Temperature Rise Produced by Different Light-curing Units through Dentin. J Contemp Dent Pract 2007; 8 (7):21-28.

DOI: 10.5005/jcdp-8-7-21

License: CC BY-NC 3.0

Published Online: 01-01-2009

Copyright Statement:  Copyright © 2007; The Author(s).



This study investigated the temperature rise caused by different light curing units and the temperature increase in dentin of different thicknesses.

Methods and Materials

Dentin discs of 1.0 and 2.0 mm thicknesses were prepared from extracted human mandibular molars. Temperatures were recorded directly at the surface of the light guide tip, under dentin discs with different thicknesses, and through a sandwich composed of 2 mm thick cured composite and dentin using a K-type thermocouple. The curing units used were two quartz-tungsten-halogen lights (Spectrum and Elipar Trilight-ET) and a light-emitting diode (LED).


The highest temperature rise was observed under a Mylar strip using ET standard mode. Under 1 and 2 mm thick dentin barriers, the lowest temperature rise was measured for the LED curing light. Significant differences in temperature rise existed among all curing units except between the Spectrum and ET exponential modes under a 1 mm thick dentin barrier with cured composite. Temperature rises were insignificant between the Spectrum and ET exponential modes and between two modes of Trilight when the same experimental setup was used under a 2 mm thick dentin barrier.


For all curing units, temperature elevation through 2 mm of dentin was less than for 1 mm of dentin thickness. The ET standard mode produced the highest and the LED produced the lowest temperature rise for all tested conditions. The thickness of dentin and light-curing unit might affect temperature transmission.


Yazici AR, Müftü A, Kugel G. Temperature Rise Produced by Different Light-curing Units through Dentin. J Contemp Dent Pract 2007 November; (8)7:021-028.

PDF Share
  1. Effect of irradiation type (LED or QTH) on photo-activated composite shrinkage strain kinetics, temperature rise, and hardness. Eur J Oral Sci 2002;110(6):471-479.
  2. Degree of conversion and temperature rise during polymerization of composite resin samples with blue diodes J Oral Rehabil 2001;28(6):586-591.
  3. Dental materials. Roberson TM, Heymann HO, Swift EJ, editors. Sturdevant's Art and Science of Operative Dentistry 4th ed. St. Louis: Mosby; 2000:340-342.
  4. Comparison of halogen, plasma and LED curing units. Oper Dent 2004;29(3):287-294.
  5. An evaluation of four light-curing units comparing soft and hard curing. Prac Perio Aesthet Dent 1999;11(1):125-132.
  6. Direct posterior restorations: clinical results and new developments. Dent Clin N Am 2002;46(2):303-339.
  7. Thermal emission by different light-curing units. Oper Dent 2003;28(3):260-266.
  8. Pulp response to externally applied heat. Oral Surg Oral Med Oral Pathol 1965;19(4):515-530.
  9. Clinical and histological evaluation of thermal injury thresholds in human teeth: A preliminary study. J Oral Rehabil 1997;24(11):791-801.
  10. Polymerization and light-induced heat of dental composite cured with LED and halogen technology. Biomaterials 2003;24(10):1809-1820.
  11. Temperature rise during adhesive and resin composite polymerization with various light curing sources. Oper Dent 2004;29(3):325-332.
  12. Comparison of temperature changes in the pulp chamber induced by various light curing units, in vitro. Oper Dent 2006;31(2):261-265.
  13. Measurement of temperature generated by visiblelight- cure lamps in an in vitro model. Dent Mater 1989;5(4):230-234.
  14. Light energy transmission through cured resin composite and human dentin. Quintessence Int 2000;31(9):659-667.
  15. Temperature rise during polymerization of visible light-activated composite resins. Dent Mater 1988;4(4):174-178.
  16. Temperature rise during polymerization of light-activated resin composites. J Oral Rehabil 1998;25(12):908-913.
  17. Temperature rise produced by various visible light generators through dentinal barriers. J Prosthet Dent 1988;59(4):433-438.
  18. In vitro temperature rises during visible-light curing of a lining material and a posterior composite. J Oral Rehabil 1988;15(4):361-6.
  19. Temperature transmission of high-output light- curing units through dentin. Oper Dent 2001;26(5): 516-520.
PDF Share
PDF Share

© Jaypee Brothers Medical Publishers (P) LTD.