Shanghai Journal of Stomatology ›› 2015, Vol. 24 ›› Issue (4): 415-418.

• Basic study • Previous Articles     Next Articles

Study of factors affecting tooth discoloration during fixed orthodontics in vitro

XU Lin-yu, DONG Min, LU You-guang, LEI Lang   

  1. Department of Orthodontics, School and Hospital of Stomatology, Fujian Medical University. Fuzhou 350002, Fujian Province, China
  • Received:2014-09-22 Online:2015-08-20 Published:2015-09-10
  • Supported by:
    Supported by Natural Science Foundation of Fujian Province (2014J01318) and Young and Middle-aged Training Project of Health Bureau of Fujiang Province (2014ZQN-JC21)

Abstract: PURPOSE: To investigate effects of acid etching, adhesives, brackets and debonding process on tooth color during direct bonding technique. METHODS: One hundred freshly extracted premolars were divided into blank control, acid etching, adhesive, acid etching+adhesive and acid etching+adhesive+bracket group. Computerized colorimeter was utilized to evaluate L*, a* and b* of tooth color parameters before treatment, 7 days and 30 days after treatment. SPSS 16.0 software package was utilized for statistical analysis. RESULTS: At 7 day,ΔE* value in all experimental groups were significantly higher than blank control group. ΔE* values of acid etching+adhesive+bracket group, and acid etching group were greater than 3.3,showing that recognizable clinic change was observed, but no significant difference was observed between the 2 groups. At 30 d, for ΔE* value, acid etching+adhesive+bracket group> acid etching group, and acid etching+adhesive group>adhesive group>blank control group. Recognizable clinic change was observed in all experimental groups (ΔE*>3.3). CONCLUSIONS: In fixed orthodontic procedures, acid etching and metal erosion resulting from long time wearing braces are two important factors leading to enamel discoloration, and adhesives removing procedures may also affect tooth discoloration.

Key words: Acid etching, Bonding, Bracket, Tooth discoloration Shanghai J Stomatol,2015, ,24(4):415?418.

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