title: [Comparison of different means for tooth surface polishing after bracket debonding].
abstract: OBJECTIVE
  To observe the tooth surface after acid etching and removing of bonding adhesive by two means for polishing.
  
  
  METHODS
  Thirty extracted premolars for orthodontic purpose were used in this experiment. The brackets were adhered and debonded. Then the premolars were randomly divided into two groups. They were treated by traditional method and silicone particles, and observed by roughness instrument and scanning electronic microscope. The polishing-time and surface roughness value(Ra) were recorded. SPSS13.0 software package was used for paired t test.
  
  
  RESULTS
  There was no significant difference in Ra and polishing-time between the two groups (P>0.05). Under SEM, the scratches on tooth surface polished by silicone particles were shallower and thinner.
  
  
  CONCLUSIONS
  The silicone particles could provide good requirement for tooth polishing after bracket debonding clinically.
authors.affiliation: Department of Orthodontics, Shanghai Stomatological Disease Centre, Shanghai, China. chli09132000@yahoo.com.cn
authors.forename: Li
authors.initials: L
authors.lastname: Chen
authors.forename: Bing-Jiao
authors.initials: BJ
authors.lastname: Zhao
authors.forename: Ju-Ju
authors.initials: JJ
authors.lastname: Zhang
mesh_terms: D001641:Bicuspid; D017005:Dental Debonding; D003743:Dental Enamel; D016910:Orthodontic Brackets; D012828:Silicones
chemical_list: D012828:Silicones