Three-dimensional assessment of external apical root resorption after maxillary posterior teeth intrusion with miniscrews in anterior open bite patients

ABSTRACT Objective: The objective of this study was to assess the external apical root resorption (EARR) of the maxillary posterior teeth after intrusion with miniscrews. Methods: Fifteen patients (13 females and 2 males) with age ranging from 14.5 to 22 years (mean 18.1 ±2.03 years) were selected to participate in this study. All patients presented with anterior open bite of 3 mm or more. An intrusion force of 300 g was applied on each side to intrude the maxillary posterior teeth. Cone beam computed tomography (CBCT) scans were taken pretreatment and post-intrusion and were analyzed to evaluate the EARR. Results: The maxillary posterior teeth were intruded in average 2.79 ± 0.46 mm (p

摘要 研究目的：本研究旨在评估采用微型种植钉支抗压入上颌后牙后，上颌后牙的根尖外吸收（external apical root resorption, EARR）情况。研究方法：选取15例患者参与本研究，其中女性13例、男性2例，年龄范围为14.5至22岁，平均年龄18.1±2.03岁。所有患者均存在3mm及以上的前牙开𬌗畸形。每侧施加300g压入力以压入上颌后牙。分别于治疗前及压入治疗后拍摄锥形束计算机断层扫描（cone beam computed tomography, CBCT），并对影像进行分析以评估根尖外吸收情况。研究结果：上颌后牙平均压入距离为2.79±0.46mm（p