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比较静态摩擦与自锁、改良槽设计和传统托槽。

Comparison of static friction with self-ligating, modified slot design and conventional brackets.

机构信息

Pontifical Catholic University of Minas Gerais, Belo HorizonteMG, Brazil.

出版信息

J Appl Oral Sci. 2013 Jul-Aug;21(4):314-9. doi: 10.1590/1678-775720130097.

DOI:10.1590/1678-775720130097
PMID:24037069
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3881893/
Abstract

OBJECTIVE

To compare the static frictional forces generated at the bracket/wire interface of stainless steel brackets with different geometries and angulations, combined with orthodontic wires of different diameters.

MATERIAL AND METHODS

The frictional forces were evaluated with three different types of metal brackets: a passive self-ligating (SmartClipTM, 3M/Unitek, Monrovia, USA), with a modified slot design (Mini Uni TwinTM, 3M/Unitek, Monrovia, USA) and conventional (Kirium, Abzil, São José do Rio Preto, Brazil). The samples were mounted in a testing device with three different angulations and tested with 0.014" and 0.018" stainless steel wires (American Orthodontics, Sheboygan, USA). The static frictional force was measured using a universal testing machine (DL 500, EMIC®, São José dos Pinhais, Brazil) with a crosshead speed of 1 mm/min. Statistical analysis was performed by two-way ANOVA followed by Bonferroni's post hoc test.

RESULTS

There was a significant difference (p<0.05) in static friction when the three types of brackets were tested with the same wire size. The wire diameter influenced friction only when the brackets had a 10º angulation (p<0.05). The angulation influenced friction (p<0.05) when the brackets were associated with a 0.018" wire.

CONCLUSION

Brackets with a modified slot design showed intermediate static frictional force values between the conventional and self-ligating brackets tested.

摘要

目的

比较不同几何形状和角度的不锈钢托槽与不同直径正畸丝在托槽/丝界面产生的静态摩擦力。

材料和方法

使用三种不同类型的金属托槽评估摩擦力：一种改良槽设计的被动自锁托槽（SmartClipTM，3M/Unitek，Monrovia，美国）、改良槽设计的Mini Uni TwinTM 托槽（3M/Unitek，Monrovia，美国）和传统托槽（Kirium，Abzil，São José do Rio Preto，巴西）。将样本安装在具有三种不同角度的测试装置中，并使用 0.014"和 0.018"不锈钢丝（美国 Orthodontics，Sheboygan，美国）进行测试。使用万能试验机（DL 500，EMIC®，São José dos Pinhais，巴西）以 1mm/min 的十字头速度测量静态摩擦力。采用双因素方差分析和 Bonferroni 事后检验进行统计学分析。

结果

当用相同尺寸的金属丝测试三种托槽时，静态摩擦力有显著差异（p<0.05）。只有当托槽角度为 10º时，金属丝直径才会影响摩擦力（p<0.05）。当托槽与 0.018"金属丝结合时，角度会影响摩擦力（p<0.05）。

结论

改良槽设计的托槽在测试的传统自锁托槽之间显示出中等静态摩擦力值。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/96c0/3881893/f54deae6d11f/jaos-21-04-0314-g02.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/96c0/3881893/b38a1b6b99bb/jaos-21-04-0314-g01.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/96c0/3881893/f54deae6d11f/jaos-21-04-0314-g02.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/96c0/3881893/b38a1b6b99bb/jaos-21-04-0314-g01.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/96c0/3881893/f54deae6d11f/jaos-21-04-0314-g02.jpg

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