Agarwal Chetankumar O, Vakil Ketan K, Mahamuni Avinash, Tekale Pawankumar Dnyandeo, Gayake Prasad V, Vakil Jeegar K
, Pune, Maharashtra, India.
Department of Orthodontics, S.M.B.T. Dental College and Hospital, Sangamner, Maharashtra, India.
Prog Orthod. 2016;17:3. doi: 10.1186/s40510-016-0116-2. Epub 2016 Jan 13.
An important constituent of an orthodontic appliance is orthodontic brackets. It is either the bracket or the archwire that slides through the bracket slot, during sliding mechanics. Overcoming the friction between the two surfaces demands an important consideration in an appliance design. The present study investigated the surface roughness of four different commercially available stainless steel brackets.
All tests were carried out to analyse quantitatively the morphological surface of the bracket slot floor with the help of scanning electron microscope (SEM) machine and to qualitatively analyse the average surface roughness (Sa) of the bracket slot floor with the help of a three-dimensional (3D) non-contact optical surface profilometer machine.
The SEM microphotographs were evaluated with the help of visual analogue scale, the surface roughness for group A = 0-very rough surface, group C = 1--rough surface, group B = 2--smooth surface, and group D = 3-very smooth surface. Surface roughness evaluation with the 3D non-contact optical surface profilometer machine was highest for group A, followed by group C, group B and group D. Groups B and D provided smooth surface roughness; however, group D had the very smooth surface with values 0.74 and 0.75 for mesial and distal slots, respectively.
Evaluation of surface roughness of the bracket slot floor with both SEM and profilometer machine led to the conclusion that the average surface roughness was highest for group A, followed by group C, group B and group D.
正畸矫治器的一个重要组成部分是正畸托槽。在滑动矫治力学中，要么是托槽，要么是弓丝在托槽槽沟内滑动。在矫治器设计中，克服两个表面之间的摩擦力是一个重要的考虑因素。本研究调查了四种不同市售不锈钢托槽的表面粗糙度。
所有测试均借助扫描电子显微镜（SEM）对托槽槽沟底部的形态表面进行定量分析，并借助三维（3D）非接触式光学表面轮廓仪对托槽槽沟底部的平均表面粗糙度（Sa）进行定性分析。
借助视觉模拟量表对SEM显微照片进行评估，A组表面粗糙度为0 - 非常粗糙的表面，C组为1 - 粗糙的表面，B组为2 - 光滑的表面，D组为3 - 非常光滑的表面。使用3D非接触式光学表面轮廓仪进行的表面粗糙度评估中，A组最高，其次是C组、B组和D组。B组和D组提供了光滑的表面粗糙度；然而，D组表面非常光滑，近中槽沟和远中槽沟的值分别为0.74和0.75。
使用SEM和轮廓仪对托槽槽沟底部的表面粗糙度进行评估得出结论，平均表面粗糙度最高的是A组，其次是C组、B组和D组。
