title: A comparative evaluation of curing depth and compressive strength of dental composite cured with halogen light curing unit and blue light emitting diode: an in vitro study.
abstract: OBJECTIVE
  To evaluate the curing depth and compressive strength of dental composite using halogen light curing unit and light emitting diode light curing unit.
  
  
  METHODS
  Eighty cylindrical composite specimens were prepared using posterior composite P60(3M). Forty specimens, out of which 20 samples (group A) cured with halogen light and 20 samples (group B) cured using light emitting diode (LED) light were checked for curing depth according to ISO 4049. Remaining 40 samples out of which 20 samples (group I) cured using halogen light and 20 samples (group II) cured using LED light were checked for compressive strength using Instron universal testing machine.
  
  
  RESULTS
  Twenty samples (group A) cured with halogen light showed better curing depth than 20 samples (group B) cured with LED light. Twenty samples (group I) cured with halogen light showed almost similar results as 20 samples (group II) cured with LED light for compressive strength.
  
  
  CONCLUSIONS
  Halogen light commonly used to cure composite resin have greater depth of cure, when compared to LED light, while both the lights produced compressive strength which is almost similar.
  
  
  CONCLUSIONS
  Lower depth of cure with the LED unit, compared to the QTH unit, is associated with different light scattering due to differences in spectral emission. LED technology differs from QTH by the spectral emission that favorably matches the absorption spectrum of camphorquinone.
authors: Department of Conservative Dentistry and Endodontics, KVG Dental College and Hospital, Sullia, Karnataka, India. drvijaycn@rediffmail.com
authors: C N Vijaya
authors: CN
authors: Kumar
authors: M
authors: M
authors: Gururaj
authors: Joseph
authors: J
authors: Paul
mesh_terms: D003188:Composite Resins / Q000737:chemistry* / Q000528:radiation effects; D019245:Compressive Strength; D055117:Curing Lights, Dental / Q000145:classification*; D003764:Dental Materials / Q000737:chemistry* / Q000528:radiation effects; D003799:Dental Stress Analysis / Q000295:instrumentation; D006244:Hardness; D006801:Humans; D008422:Materials Testing; D058105:Polymerization; D011829:Radiation Dosage; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D003188:Composite Resins; D003764:Dental Materials; C443708:P60 Condensible Resin Composite; D014867:Water