Park Jae Hyun, Kim Kyung Wook, Lee Nam-Ki, Ku Ja Hyeong, Kim Jaehyun, Kook Yoon-Ah, Chou Alex Hung Kuo, Kim Yoonji
Postgraduate Orthodontic Program, Arizona School of Dentistry & Oral Health, A.T. Still University, Mesa, AZ, USA.
Graduate School of Dentistry, Kyung Hee University, Seoul, Korea.
Orthod Craniofac Res. 2022 May;25(2):159-167. doi: 10.1111/ocr.12519. Epub 2021 Aug 2.
The purpose of this study was to evaluate the effects of a triangular-shaped corticotomy on the protraction of second and third molars in patients with missing mandibular first molars.
The corticotomy and non-corticotomy groups consisted of sixteen first molars in fifteen patients (28.6 ± 9.4 years) and nineteen first molars in fifteen patients (26.6 ± 8.4 years), respectively. A triangular-shaped corticotomy was performed between the second premolar and molar. Temporary skeletal anchorage devices (TSADs) were placed between the first and second premolars in both groups. Mandibular dentition variables were measured on the pre and post-treatment panoramic radiographs and lateral cephalograms. Analysis of covariance was performed.
The corticotomy group exhibited 2.8 mm more inter-radicular correction between the second molar to second premolar roots (P < .001) and 1.6 mm more inter-radicular distance correction between the third molar to second premolar roots compared to the non-corticotomy group (P < .01). The corticotomy group required 5.5 months less treatment time for space closure (P < .05), but the total treatment time was the same for both groups.
The inter-radicular distance between the mandibular second premolar and molar and treatment times for space closure was significantly reduced in the corticotomy group.
本研究的目的是评估三角形皮质切开术对下颌第一磨牙缺失患者第二和第三磨牙前移的影响。
皮质切开术组和非皮质切开术组分别由15例患者的16颗第一磨牙（年龄28.6±9.4岁）和15例患者的19颗第一磨牙（年龄26.6±8.4岁）组成。在第二前磨牙和磨牙之间进行三角形皮质切开术。两组均在第一和第二前磨牙之间放置临时骨锚装置（TSADs）。在治疗前和治疗后的全景X线片和头颅侧位片上测量下颌牙列变量。进行协方差分析。
与非皮质切开术组相比，皮质切开术组第二磨牙至第二前磨牙牙根间的根间矫正增加2.8mm（P<.001），第三磨牙至第二前磨牙牙根间的根间距离矫正增加1.6mm（P<.01）。皮质切开术组关闭间隙所需的治疗时间减少5.5个月（P<.05），但两组的总治疗时间相同。
皮质切开术组下颌第二前磨牙和磨牙之间的根间距离以及关闭间隙的治疗时间显著缩短。
