Hamdan Bin Mohammed College of Dental Medicine, Department of Orthodontics, Dubai, United Arab Emirates.
American University in Dubai, Department of Mechanical Engineering, Dubai, United Arab Emirates.
Int Orthod. 2020 Mar;18(1):121-126. doi: 10.1016/j.ortho.2019.07.002. Epub 2019 Aug 30.
The bond strength between enamel and the bracket base is influenced by exposure to the oral environment. The aim of the current study was to determine the effect of cigarette smoke on the shear bond strength (SBS) of bonded metallic and ceramic orthodontic brackets.
a sample of 60 sound extracted premolars were divided into four groups (n=15 each) as follows: group (A): ceramic brackets without smoke exposure, (B): metallic brackets without smoke exposure, (C): ceramic brackets with smoke exposure, (D): metallic brackets with smoke exposure. Smoking exposure was simulated using the British American Tobacco's exposure chamber manufactured by Curbridge Engineering (Hampshire, UK). Metallic and ceramic brackets were bonded to the enamel using conventional acid etching technique. SBS (MPa) was tested using the universal Instron testing machine at a constant cross head speed of 1mm/min until failure. Kolmogorov-Smirnov test was used to test the normality of the measurements. One-way analysis of variance (ANOVA) was used to compare the means of SBSs between the four groups, Post-hoc with least significance difference was used to perform a pairwise comparison between means. Statistical significance was set at P<0.05.
The highest SBS corresponded to the ceramic type brackets bonded to a non-smoking sample (15.7±9.5) while the lowest levels of SBS was related to metallic type brackets bonded to smoke exposed sample (2.8±0.7) and the difference was statistically significant (P<0.05).
Cigarette smoke consumption has significant effects on the SBS of orthodontic brackets. SBS levels were significantly lower in the smoke exposure groups and the lowest values corresponded to the cigarette smoke exposed metallic brackets.
牙釉质与托槽基底之间的粘结强度受口腔环境暴露的影响。本研究旨在确定香烟烟雾对粘结的金属和陶瓷正畸托槽的剪切粘结强度（SBS）的影响。
采集 60 颗健康的离体前磨牙，分为 4 组（每组 15 颗）：组（A）：未暴露于烟雾的陶瓷托槽，（B）：未暴露于烟雾的金属托槽，（C）：暴露于烟雾的陶瓷托槽，（D）：暴露于烟雾的金属托槽。使用英国英美烟草公司（British American Tobacco）的 Curbridge Engineering（英国汉普郡）生产的暴露室模拟吸烟暴露。使用常规酸蚀技术将金属和陶瓷托槽粘结到牙釉质上。使用万能 Instron 试验机以恒定的十字头速度（1mm/min）测试 SBS（MPa），直到失效。采用 Kolmogorov-Smirnov 检验对测量值进行正态性检验。采用单因素方差分析（ANOVA）比较四组 SBS 均值，采用最小显著差异法进行组间两两比较。统计显著性设为 P<0.05。
未暴露于烟雾的陶瓷托槽粘结的 SBS 最高（15.7±9.5），而暴露于烟雾的金属托槽粘结的 SBS 最低（2.8±0.7），差异有统计学意义（P<0.05）。
吸烟会显著影响正畸托槽的 SBS。暴露于烟雾组的 SBS 水平显著降低，最低值对应于暴露于香烟烟雾的金属托槽。
