Sanchez Donald J, Walker Mary P, Kula Katherine, Williams Karen B, Eick J David
Department of Orthodontics, AZ School of Dentistry and Oral Health, Mesa, AZ, USA.
Angle Orthod. 2008 May;78(3):524-30. doi: 10.2319/052707-250.1.
To test the hypothesis that fluoride prophylactic agents do not affect the fracture strength and fracture morphology of the tie-wing complex of ceramic brackets.
The fracture strength of the distal incisal tie-wing of two polycrystalline brackets, Clarity and Mystique, and a monocrystalline bracket, Inspire, was measured after the brackets were exposed to either Prevident, Phos-flur gel, or distilled water (control). Scanning electron microscopy was used to qualitatively evaluate the tie-wing intact and fractured surfaces.
A two-way analysis of variance and Fisher-Hayter post hoc test, alpha = .05, indicated a significant decrease in tie-wing fracture strength following both fluoride treatments when compared with the distilled water control only with the monocrystalline bracket. None of the bracket brands exhibited any qualitative differences in the tie-wing intact or fracture surfaces as a function of fluoride treatment.
The hypothesis is rejected. Based on the results, using topical fluoride agents with monocrystalline brackets might be contraindicated because of increased tie-wing fracture susceptibility.
验证氟化物预防剂不会影响陶瓷托槽翼片复合体的断裂强度和断裂形态这一假设。
将Clarity和Mystique两种多晶托槽以及Inspire单晶托槽的远中切端翼片暴露于Prevident、含氟凝胶或蒸馏水（对照）后，测量其断裂强度。采用扫描电子显微镜对翼片完整表面和断裂表面进行定性评估。
双向方差分析和Fisher-Hayter事后检验（α = 0.05）表明，仅在单晶托槽中，与蒸馏水对照相比，两种氟化物处理后翼片断裂强度均显著降低。各托槽品牌的翼片完整表面或断裂表面在氟化物处理方面均未表现出任何定性差异。
该假设被否决。基于这些结果，由于翼片断裂易感性增加，使用含氟局部用剂与单晶托槽搭配可能是禁忌的。
