Ex vivo surface and mechanical properties of coated orthodontic archwires
Ex vivo surface and mechanical properties of coated orthodontic archwires
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DOI：
10.1093/ejo/cjn057
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发表时间：
2008-12-01
影响因子：
2.6
通讯作者：
Bearn, David
中科院分区：
文献类型：
--
作者：
Elayyan, Firas;Silikas, Nick;Bearn, David
本研究检查了回收的涂层镍钛（NiTi）弓丝与未使用样本的机械和物理性能。研究了Ultraesthetic（TM）0.016英寸涂层弓丝（G & Wire Company）。使用传统和自锁托槽系统对10根收到的金属丝进行三点弯曲测试。用触针式轮廓仪测量涂层的表面粗糙度。光学和扫描电子显微镜被用来评估表面形貌。在体内使用10根弓丝，持续4至6周。对取出的弓丝进行相同的试验。使用数码摄影计算剩余涂层的百分比。涂层弓丝在体内使用的平均时间为33天。在三点弯曲试验中，使用传统的弹性结扎，回收的弓丝产生较低的卸载力（P < 0.001）。当偏转4 mm时，取出的和接收的涂层弓丝产生的卸载力为零。当使用自锁托槽系统进行测试时，取出的和接收的涂层弓丝产生的力相同（P > 0.05）。使用表面轮廓测量法，所有测量的粗糙度参数（R-sm除外）对于回收的涂层弓丝具有更大的表面粗糙度（P < 0.05）。在显微镜下，取出的涂层弓丝显示变色、沟裂和分层。只有75%的涂层存在于回收的涂层弓丝中。回收的涂层弓丝产生的卸载力值低于收到的涂层弓丝与传统结扎。涂层弓丝使用后表面粗糙度增加。涂层弓丝具有较低的美学价值，在体内33天内有25%的涂层损失。
This study examined the mechanical and physical properties of retrieved coated nickel-titanium (NiTi) archwires compared with unused samples. Ultraesthetic (TM) 0.016 inch coated archwires (G & Wire Company) were investigated. Ten as-received wires were subjected to a three-point bending test using conventional and self-ligating bracket systems. Surface roughness of the coating was measured with a contact stylus profilometer. Optical and scanning electron microscopes were used to assess surface topography. Ten archwires were used in vivo for a period of between 4 and 6 weeks. Retrieved archwires were subjected to the same tests. The percentage of the remaining coating was calculated using digital photography. Coated archwires were used in vivo for a mean period of 33 days. Differences between the mean values of the as-received and retrieved archwires were determined using t-tests.In the three-point bending test, with conventional elastomeric ligation, retrieved wires produced a lower unloading force (P < 0.001). Both retrieved and as-received coated archwires produced zero values of unloading force when deflected for 4 mm. When tested using a self-ligating bracket system, retrieved and as-received coated archwires produced the same amount of force (P > 0.05). With surface profilometry, all measured roughness parameters (except R-sm) had greater surface roughness for the retrieved coated archwires (P < 0.05). Under microscopy, retrieved coated archwires showed discolouration, ditching, and delamination. Only 75 per cent of the coating was present in retrieved coated archwires.Retrieved coated archwires produced lower unloading force values than as-received coated archwires with conventional ligation. Surface roughness of coated archwires increased after use. Coated archwires have a low aesthetic value, with 25 per cent of the coating lost within 33 days in vivo.