Department of Orthodontics, School of Dentistry, Seoul National University, Seoul, South Korea.
Angle Orthod. 2012 Jul;82(4):611-7. doi: 10.2319/071311-447.1. Epub 2011 Oct 19.
To compare in vivo and in vitro mechanical stability of orthodontic mini-implants (OMIs) treated with a sandblasted, large-grit, and anodic-oxidation (SLAO) method vs those treated with a sandblasted, large-grit, and acid-etching (SLA) method.
Fifty-four titanium OMIs (cylindrical shape, drill-free type; diameter = 1.45 mm, length = 8 mm, Biomaterials Korea Inc, Seoul, Korea) were allocated into control, SLA, and SLAO groups (N = 12 for in vivo and N = 6 for in vitro studies per group). In vitro study was carried out on a polyurethane foam bone block (Sawbones, Pacific Research Laboratories Inc, Vashon, Wash). In vivo study was performed in the tibias of Beagles (6 males, age = 1 year, weight = 10 to 13 kg; OMIs were removed at 8 weeks after installation). For insertion and removal of OMIs, the speed and maximum torque of the surgical engine were set to 30 rpm and 40 Ncm, respectively. Maximum torque (MT), total energy (TE), and near peak energy (NPE) during the insertion and removal procedures were statistically analyzed.
In the in vitro study, although the control group had a higher insertion MT value than the SLA and SLAO groups (P < .01), no differences in insertion TE and NPE or in any of the removal variables were noted among the three groups. In the in vivo study, the control group exhibited higher values for all insertion variables compared with the SLA and SLAO groups (MT, P < .001; TE, P < .01; NPE, P < .001). Although no difference in removal TE and removal NPE was noted among the three groups, the SLAO group presented with a higher removal MT than the SLA and control groups (P < .001).
SLAO treatment may be an effective tool in reducing insertion damage to surrounding tissue and improving the mechanical stability of OMIs.
比较经喷砂大颗粒酸蚀（SLA）和喷砂大颗粒阳极氧化（SLAO）处理的正畸微种植体（OMI）的体内和体外机械稳定性。
将 54 个钛 OMIs（圆柱形，无钻型；直径 = 1.45 毫米，长度 = 8 毫米，韩国 Biomaterials Korea Inc）分配到对照组、SLA 组和 SLAO 组（每组体内研究 N = 12，体外研究 N = 6）。体外研究在聚氨酯泡沫骨块（Sawbones，Pacific Research Laboratories Inc，Vashon，Wash）上进行。体内研究在 Beagle 犬的胫骨中进行（6 只雄性，年龄 = 1 岁，体重 = 10 至 13 千克；安装后 8 周取出 OMIs）。为了插入和取出 OMIs，手术引擎的速度和最大扭矩分别设置为 30 rpm 和 40 Ncm。对插入和取出过程中的最大扭矩（MT）、总能量（TE）和近峰值能量（NPE）进行统计学分析。
在体外研究中，尽管对照组的插入 MT 值高于 SLA 和 SLAO 组（P <.01），但三组之间的插入 TE 和 NPE 或任何移除变量均无差异。在体内研究中，对照组的所有插入变量值均高于 SLA 和 SLAO 组（MT，P <.001；TE，P <.01；NPE，P <.001）。尽管三组之间的移除 TE 和移除 NPE 无差异，但 SLAO 组的移除 MT 值高于 SLA 和对照组（P <.001）。
SLAO 处理可能是一种减少周围组织插入损伤和提高 OMIs 机械稳定性的有效工具。
