Private practive, Cheongju, Korea.
Postgraduate Orthodontic Program, Arizona School of Dentistry & Oral Health, A. T. Still University, Mesa, Ariz; Graduate School of Dentistry, Kyung Hee University, Seoul, Korea.
Am J Orthod Dentofacial Orthop. 2018 Jul;154(1):108-114. doi: 10.1016/j.ajodo.2017.10.032.
The 2-fold purpose of this study was to evaluate the effects of acid etching and calcium chloride immersion on removal torque and the bone-cutting ability of orthodontic mini-implants (OMIs).
For the removal torque part of the study, 3 types of OMIs (titanium alloy) were evaluated in a rabbit model: OMIs with acid surface etching with and without calcium chloride immersion (ECG and EG, respectively) and a control group (CG), in which the OMIs had an untreated, machined surface. We inserted 126 OMIs (42 OMIs per type) into both tibias of 21 male rabbits (5 months of age) with body weights of 3.0 to 3.5 kg. Removal torque was evaluated after 1, 4, and 7 weeks. To determine the OMIs' bone-cutting ability, total insertion time to place an OMI 6 mm into artificial bone was measured (6 OMIs per group).
Removal torque values for the EG (3.97 ± 0.52 Ncm) and ECG (4.21 ± 0.44 Ncm) were statistically and significantly higher than those of the CG (3.02 ± 0.53 Ncm) 1 week after implantation (P <0.05). The ECG (6.54 ± 0.50, 6.61 ± 0.66 Ncm) showed the highest removal torque value followed by the EG (5.68 ± 0.58, 5.89 ± 0.70 Ncm) and CG (3.43 ± 0.62, 3.38 ± 0.54 Ncm) at 4 and 7 weeks after implantation (P <0.05). Removal torque did not change over time with the CG, but with the ECG and EG, it was significantly higher in weeks 4 and 7 than in week 1 (P <0.05). Total insertion time was significantly greater for the EG than for the ECG and CG (P <0.05).
Treating OMIs with a calcium chloride solution improved the initial bone reaction by preventing contamination of the implant surface, and increasing the surface roughness of OMIs by acid etching enhanced their stability without decreasing the bone-cutting ability compared with OMIs without surface treatment.
本研究的双重目的是评估酸蚀和氯化钙浸泡对正畸微型种植体（OMI）去除扭矩和骨切割能力的影响。
在兔模型中评估了 3 种类型的 OMI（钛合金）：分别具有酸表面蚀刻和无氯化钙浸泡的 OMI（ECG 和 EG）和对照组（CG），其中 OMI 具有未经处理的机械加工表面。我们将 126 个 OMI（每个类型 42 个）插入 21 只雄性兔子（5 个月大，体重 3.0 至 3.5kg）的双侧胫骨中。在 1、4 和 7 周后评估去除扭矩。为了确定 OMI 的骨切割能力，测量将 OMI 插入人工骨 6mm 所需的总插入时间（每组 6 个 OMI）。
植入后 1 周，EG（3.97±0.52Ncm）和 ECG（4.21±0.44Ncm）的去除扭矩值明显高于 CG（3.02±0.53Ncm）（P<0.05）。ECG（6.54±0.50、6.61±0.66Ncm）的去除扭矩值最高，其次是 EG（5.68±0.58、5.89±0.70Ncm）和 CG（3.43±0.62、3.38±0.54Ncm），植入后 4 和 7 周（P<0.05）。CG 的去除扭矩值随时间没有变化，但 ECG 和 EG 的去除扭矩值在第 4 周和第 7 周明显高于第 1 周（P<0.05）。EG 的总插入时间明显大于 ECG 和 CG（P<0.05）。
用氯化钙溶液处理 OMI 可通过防止植入物表面污染来改善初始骨反应，并通过酸蚀增加 OMI 的表面粗糙度，从而增强其稳定性，而不会降低与未经表面处理的 OMI 相比的骨切割能力。
