Department of Orthodontics, Federal University of Pará, Brasil.
Eur J Orthod. 2013 Apr;35(2):223-9. doi: 10.1093/ejo/cjr104. Epub 2011 Oct 19.
Dental material science has paid more attention to mechanical properties of as-received materials than to changes produced after intraoral exposure. Orthodontic archwires when exposed to the intraoral environment have shown a significant increase in the degree of debris, surface roughness (Ra), and frictional force. The purpose of this split-mouth study was to evaluate the effects of two methods of archwire cleaning on these variables after clinical use for 8 weeks. For eight individuals, four sets of three brackets each (n = 32) were bonded from the first molar to the first premolar. A passive segment of 0.019 × 0.025 inch stainless steel (SS) archwire was inserted into the brackets and tied by elastomeric ligature. Debris level [via scanning electron microscopy (SEM)], Ra, and frictional force were evaluated in a paired comparison after 8 weeks of intraoral exposure and after cleaning with a steel wool sponge (SWS) for 1 minute or ultrasound (US) cleaning for 15 minutes. Kruskal-Wallis, Friedman's, and Spearman and Pearson correlation tests were used for statistical analysis. The debris and Ra of SS rectangular wires increased significantly (P < 0.05) during clinical use, causing a significant increase in the frictional force level. These changes can be effectively eliminated by either of the investigated cleaning methods, although a SWS seems to be clinically more practical.
口腔材料科学更关注来料的机械性能，而不是口腔内暴露后产生的变化。正畸弓丝在暴露于口腔环境后，其表面粗糙度（Ra）、表面附着物和摩擦力都显著增加。本研究采用分口对照的方法，旨在评估临床使用 8 周后，两种弓丝清洁方法对这些变量的影响。8 名研究对象的每例上颌均从第一磨牙到第一前磨牙粘结四组托槽（n = 32），并于托槽内插入 0.019×0.025 英寸的不锈钢方丝，用橡皮圈结扎固定。8 周口腔内暴露后，采用钢棉擦拭 1 分钟或超声清洁 15 分钟，用扫描电子显微镜（SEM）评估表面附着物水平、Ra 和摩擦力，并进行配对比较。采用 Kruskal-Wallis、Friedman 和 Spearman 及 Pearson 相关检验进行统计学分析。在临床使用过程中，不锈钢方丝的表面附着物和 Ra 显著增加（P < 0.05），导致摩擦力水平显著升高。这两种清洁方法都能有效消除这些变化，但钢棉似乎在临床上更实用。
