title: [Effect of light-emitting diode curing light and halogen light on microleakage of extracted teeth].
abstract: OBJECTIVE
  To evaluate the effect of light-emitting diode (LED) curing light and Halogen dental curing light on the microleakage of Clearfil AP-X composite restorations and to provide evidence for clinical use of LED curing light.
  
  
  METHODS
  Class V cavities were prepared in 73 freshly extracted teeth. The teeth were randomly divided into two groups being exposed to light-emitting diode curing light MORITA PENCURE and halogen light 3M ESPE Elipar 2500 respectively, and then treated with thermocycling (500 cycles, 5-55 degrees C), section and dyeing. The amounts of dye infiltration and marginal seal were examined by stereomicroscope and scanning electron microscope (SEM) respectively.
  
  
  RESULTS
  No significant differences were found in the amount of dye infiltration shown in the stereo-photomicrograph between the two groups. However, the SEM revealed better marginal seals of those teeth exposed to LED curing light.
  
  
  CONCLUSIONS
  The LED curing light may be able to achieve the same or better effect on reducing microleakage compared with the Halogen dental curing light. Further studies are needed.
authors.affiliation: Key Lab of Oral Biomedical Engineering Ministry of Education, West China School of Stomatology, Sichuan University, Chengdu 610041, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Guo
authors.forename: Oing-Qing
authors.initials: OQ
authors.lastname: Wang
authors.forename: Ke-Hua
authors.initials: KH
authors.lastname: Que
authors.forename: Si-Jing
authors.initials: SJ
authors.lastname: Xie
authors.forename: Yu-Qing
authors.initials: YQ
authors.lastname: Hao
authors.forename: Fan
authors.initials: F
authors.lastname: Yang
authors.forename: Jing
authors.initials: J
authors.lastname: Liu
mesh_terms: D055117:Curing Lights, Dental; D003763:Dental Leakage; D004566:Electrodes; D006801:Humans; D008027:Light; D008855:Microscopy, Electron, Scanning; D014070:Tooth / Q000473:pathology* / Q000528:radiation effects* / Q000648:ultrastructure; D014081:Tooth Extraction