The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Bond strength of orthodontic brackets bonded to enamel with a self-etching primer after bleaching and desensitizer application

미백과 탈감작제 도포 후 셀프 에칭 프라이머를 이용한 브라켓 접착 시 법랑질과 브라켓 간의 결합 강도

  • Attar, Nuray (Department of Conservative Dentistry, Faculty of Dentistry, Hacettepe University) ;
  • Korkmaz, Yonca (Department of Conservative Dentistry, Faculty of Dentistry, Baskent University) ;
  • Kilical, Yasemin (College of Dental Medicine, Columbia University) ;
  • Saglam-Aydinatay, Banu (Department of Orthodontics, Faculty of Dentistry, Hacettepe University) ;
  • Bicer, Ceren Ozge (Department of Conservative Dentistry, Faculty of Dentistry, Hacettepe University)
  • Received : 2010.05.31
  • Accepted : 2010.06.26
  • Published : 2010.10.30
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Abstract

Objective: The aim of this study was to compare the shear bond strengths (SBS) of orthodontic brackets bonded to enamel with a self-etching primer after bleaching, desensitizer application and combined treatment. Methods: Forty-eight premolars were randomly divided into four groups, each with n = 12 premolar samples. The four groups were; Group1: 15% hydrogen-peroxide office bleaching agent (Illumin$\acute{e}$ Office-IO), Group 2: IO + BisBlock Oxalate Dentin-Desensitizer, Group 3: Bis Block Oxalate Dentin-Desensitizer, Group 4: No treatment (control). Twenty-four hours after bonding, the specimens were tested in SBS at a crosshead speed of 5 mm/min until the brackets debonded. The failure mode of the brackets was determined by a modified adhesive remnant index. Results: Bleaching, bleaching and desensitizer treatment, and desensitizer treatment alone all significantly reduced SBS of the orthodontic brackets ($p$ = 0.001). No statistically significant difference was found between Group 1, Group 2 and Group 3 (Group 1-Group 2, $p$ = 0.564; Group 1-Group 3, $p$ = 0.371; Group 2-Group 3, $p$ = 0.133). The predominant mode of failure for the treatment groups (Group1, Group 2 and Group 3) was at the enamel-adhesive interface leaving 100% of the adhesive on the bracket base. Conclusions: Bleaching and desensitizer treatment should be delayed until the completion of orthodontic treatment.

본 연구는 미백, 탈감작제 도포 후, 셀프 에칭 프라이머를 이용하여 브라켓 접착 시 법랑질에 대한 전단결합강도를 비교하기 위해 시행되었다. 48개의 소구치를 무작위로 12개씩 4개의 그룹으로 분류하였다. Group 1: 15% hydrogen-peroxide office bleaching agent (Illumine Office-IO), Group 2: IO + BisBlock Oxalate Dentin-Desensitizer, Group 3: Bis-Block Oxalate Dentin-Desensitizer, Group 4: 아무것도 하지 않음(대조군). 브라켓 접착 24시간 후 전단결합강도를 측정하였으며, 만능시험기의 속도를 5 mm/min로 하여 브라켓이 탈락할 때까지 시행하였다. Modified adhesive remnant index를 이용하여 탈락 양상을 분석하였다. 미백만 시행, 미백과 탈감작제 도포, 탈감작제만 도포한 경우 모두 브라켓의 전단결합강도를 현저히 감소시켰으며 ($p$ = 0.001), 이 세 실험군 간에는 통계적으로 유의성 있는 차이를 관찰할 수 없었다 (Group 1-Group 2, $p$ = 0.564; Group 1-Group 3, $p$ = 0.371; Group 2-Group 3, $p$ = 0.133). 세 실험군에서 브라켓의 탈락은 주로 법랑질-접착제 계면에서 발생하여 브라켓 베이스에 접착제의 100%가 남아있었다. 따라서 미백과 탈감작제 도포는 교정치료 후에 시행하는 것이 바람직하다.

Keywords

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