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首页> 外文期刊>Dental Press Journal of Orthodontics >Lubricating conditions: effects on friction between orthodontic brackets and archwires with different cross-sections
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Lubricating conditions: effects on friction between orthodontic brackets and archwires with different cross-sections

机译：润滑条件：对不同截面的正畸托槽与弓丝之间摩擦的影响

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Objective: This study investigated the effect of the condition of lubrication on the friction between brackets and NiTi archwires of different rounded cross-sections. Methods: Brackets (Roth, GAC) were affixed to a device connected to a universal testing machine into which segments of archwire were placed (NiTi, Nitinol, GAC) with cross-sections of 0.012-in, 0.016-in and 0.020-in. Once the wire was in the bracket slot, the following lubricants were applied: human saliva (HS: positive control), distilled water (DI), mucin-based (MUC) or carboxymethylcellulose-based (CMC) artificial saliva. In the negative control group, no lubricant was used. The combination between the wire cross-sections and the lubrication condition generated 15 groups with 15 samples each. Data were submitted to two-way analysis of variance and Tukey’s test. Results: There was no significant interaction between the wire cross-section and the condition of lubrication ( p = 0.901). Irrespective of whether lubricants were used or not, there was a significant increase in friction with an increase in the cross-section of the wire ( p 0.001). For any wire, the group tested in the presence of MUC was not different from that in which HS was applied. On the other hand, when the application of lubricants was suppressed, significantly higher friction values were observed. The CMC group and the DI group demonstrated intermediate behavior. Conclusions: Friction increased with the increase of the cross-section of the NiTi archwire, but regardless of the archwire, friction with MUC artificial saliva was similar to that of HS and lower than in dry conditions.
机译：目的：本研究研究了润滑条件对不同圆形横截面的托槽与NiTi弓丝之间摩擦的影响。方法：将支架（Roth，GAC）固定在与通用试验机相连的装置上，在该装置中放置弓丝段（NiTi，Nitinol，GAC），截面分别为0.012英寸，0.016英寸和0.020英寸。将金属丝放入支架插槽后，即可使用以下润滑剂：人唾液（HS：阳性对照），蒸馏水（DI），粘蛋白基（MUC）或羧甲基纤维素基（CMC）人造唾液。在阴性对照组中，没有使用润滑剂。焊丝横截面和润滑条件之间的结合产生了15组，每组15个样品。数据已提交给方差和Tukey检验的双向分析。结果：焊丝横截面和润滑条件之间没有显着的相互作用（p = 0.901）。不管是否使用润滑剂，随着导线横截面的增加，摩擦都显着增加（p <0.001）。对于任何电线，在MUC存在下测试的组与应用HS的组没有区别。另一方面，当抑制润滑剂的施加时，观察到明显更高的摩擦值。 CMC组和DI组表现出中间行为。结论：摩擦力随着NiTi弓丝横截面的增加而增加，但无论弓丝如何，与MUC人工唾液的摩擦力均与HS相似，且低于干燥条件。

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