Department of Orthodontics, Institute of Craniofacial Deformity, College of Dentistry, Yonsei University, 50‑1 Yonsei‑ro, Seodaemun‑gu, Seoul, 03722, Korea.
BMC Oral Health. 2023 Mar 22;23(1):164. doi: 10.1186/s12903-023-02842-1.
The purpose of this study is to evaluate stability of vertical dimension following total arch intrusion using miniscrews by measuring the change during treatment and relapse amount after more than one year of retention.
Thirty patients (6 men, 24 women) were included in this study. Lateral cephalographs were taken with conventional radiography at the start of treatment (T0), after treatment (T1), and at least one year after treatment (T2). The evaluation was performed by measuring changes of selected parameters during treatment and the extent of relapse after more than one year.
During total arch intrusion treatment (T1-T0), anterior and posterior teeth intruded significantly. The mean vertical distance between the maxillary posterior teeth and palatal plane was reduced by 2.30 mm (P < 0.001). The mean vertical distance between the maxillary anterior teeth and palatal plane was reduced by 2.04 mm (P < 0.001). The anterior facial height was also reduced by 2.70 mm (P < 0.001). During retention period (T2-T1), the vertical distance between the maxillary anterior teeth and the palatal plane significantly increased by 0.92 mm (P < 0.001). The anterior facial height increased by 0.81 mm (P < 0.01).
Anterior facial height significantly decreases after treatment. During retention period, relapse of AFH and maxillary anterior teeth observed. There was no correlation between initial amount of AFH, mandibular plane angle, or SNPog and posttreatment AFH relapse. However, there was a significant correlation between the amount of intrusion of anterior and posterior teeth achieved by the treatment and the extent of relapse.
本研究旨在通过测量治疗期间的变化和超过一年保留期后的复发量，评估使用微型螺钉进行全弓内陷后垂直向的稳定性。
本研究纳入 30 名患者（6 名男性，24 名女性）。在治疗开始时（T0）、治疗后（T1）和治疗后至少一年（T2）时，通过常规放射摄影拍摄侧位头颅侧位片。通过测量治疗期间选定参数的变化和超过一年后复发的程度来进行评估。
在全弓内陷治疗期间（T1-T0），前牙和后牙明显内陷。上颌后牙与腭平面之间的平均垂直距离减少了 2.30 毫米（P<0.001）。上颌前牙与腭平面之间的平均垂直距离减少了 2.04 毫米（P<0.001）。前面部高度也减少了 2.70 毫米（P<0.001）。在保留期（T2-T1）期间，上颌前牙与腭平面之间的垂直距离显著增加了 0.92 毫米（P<0.001）。前面部高度增加了 0.81 毫米（P<0.01）。
治疗后前面部高度显著下降。在保留期间，观察到 AFH 和上颌前牙的复发。初始 AFH 量、下颌平面角或 SNPog 与治疗后 AFH 复发之间无相关性。然而，治疗中前牙和后牙内陷量与复发程度之间存在显著相关性。
