Nanjing Stomatoloigcal Hospital, Affiliated Hospital of Medical School, Nanjing University, 210000 Nanjing, Jiangsu, China.
J Clin Pediatr Dent. 2024 Jan;48(1):41-51. doi: 10.22514/jocpd.2024.006. Epub 2024 Jan 3.
Protracting lower second molars and uprighting horizontally impacted third molars is a significant orthodontic challenge in patients who require the extraction of severely decayed first molars. Here, we describe the use of biomechanics to upright 90°-tilted lower third molars following second molar protraction. Herein, we introduce a technique for uprighting the lower third molars by (1) the placement of superelastic nickel titanium archwires, (2) bonding, and (3) repositioning of a buccal tube in a tilted position to compensate for the efficiency of Ni-Ti (nickel-titanium) wire. The treatment mechanics used for our two cases showed that even severely impacted third molars can be uprighted by routine continuous straight-wire techniques. This technique proved to be a simple, efficient and reliable treatment option for uprighting horizontally impacted third molars.
在需要拔除严重龋坏的第一磨牙的患者中，延长下颌第二磨牙并直立水平阻生的第三磨牙是一项重大的正畸挑战。在这里，我们描述了在第二磨牙伸长后使用生物力学方法直立 90°倾斜的下颌第三磨牙。在此，我们介绍了一种通过以下方法直立下颌第三磨牙的技术：（1）放置超弹性镍钛弓丝；（2）粘结；（3）将颊管重新定位到倾斜位置，以补偿 Ni-Ti（镍钛）丝的效率。我们的两个病例中使用的治疗力学表明，即使是严重阻生的第三磨牙也可以通过常规的连续直丝技术直立。该技术被证明是一种简单、高效、可靠的治疗水平阻生第三磨牙的方法。
