title: [A pathological study on the influence of bleaching technique on vital tooth pulp].
abstract: OBJECTIVE
  To investigate the influence of bleaching technique on vital tooth pulp.
  
  
  METHODS
  A total of 40 vital teeth extracted for orthodontics were selected, of which, 10 teeth without any treatment served as control, 15 teeth were extracted instantly after bleaching and 15 teeth were extracted 7 days after bleaching. Slides were made from all these three groups and subject to pathological examination under microscope.
  
  
  RESULTS
  No clinical symptoms were found in all the teeth before and after bleaching. All teeth in the three groups showed normal pulp on pathological examination.
  
  
  CONCLUSIONS
  Bleaching did not affect vital tooth pulp and is a safe technique.
authors.affiliation: Department of Cariology and Endodontology, First Outpatient Dental Clinic, Peking University School and Hospital of Stomatology, Beijing 100034, China. qiz213@yahoo.com.cn
authors.forename: Qi
authors.initials: Q
authors.lastname: Zhao
authors.forename: Jun-xiang
authors.initials: JX
authors.lastname: Wang
authors.forename: Zhao-hua
authors.initials: ZH
authors.lastname: Feng
mesh_terms: D003782:Dental Pulp / Q000473:pathology*; D006801:Humans; D014073:Tooth Bleaching / Q000379:methods*