Angle Orthod. 2024 May 1;94(3):294-302. doi: 10.2319/081823-567.1.
To evaluate the change in tooth root volume using cone-beam computed tomography (CBCT) in a group of patients treated concurrently with clear aligners and an adjunctive photobiomodulation (PBM) device.
This retrospective cohort pilot study included the records of 32 consecutively treated clear aligner patients (23 female, 9 male) from the private practice of one orthodontist. The PBM group (n = 16) used the device once per day for 5 minutes per arch and was compared with a matched control group (n = 16). A semiautomated segmentation technique was used to obtain tooth volume of anterior teeth from CBCT imaging prior to (T0) and during or immediately following (T1) orthodontic treatment with clear aligners. The change in root volume between time points was assessed.
There was no statistically significant difference between the pre- and posttreatment root volumes of maxillary and mandibular anterior teeth, regardless of which intervention group the patient belonged to (P > .05). There was also no difference in the mean percentage change in root volume between clear aligner patients in this study who were treated with the PBM device compared with a matched control group (P > .05).
Clear aligner patients in this study who changed their aligners every 3 to 5 days and used adjunctive photobiomodulation therapy did not experience clinically relevant orthodontically induced external root resorption. Due to the small sample size and measurement error in the root segmentation process, the results should be interpreted with caution.
使用锥形束计算机断层扫描（CBCT）评估同时接受透明牙套和附加光生物调节（PBM）设备治疗的一组患者的牙根体积变化。
本回顾性队列研究纳入了一位正畸医生私人执业中连续治疗的 32 名透明牙套患者（23 名女性，9 名男性）的记录。PBM 组（n=16）每天使用设备一次，每弓 5 分钟，并与匹配的对照组（n=16）进行比较。使用半自动分割技术从 CBCT 成像中获取正畸治疗前（T0）和使用透明牙套治疗期间或之后即刻（T1）前牙的牙齿体积。评估两个时间点之间的牙根体积变化。
无论患者属于哪个干预组，上颌和下颌前牙的治疗前后牙根体积均无统计学差异（P＞.05）。与接受 PBM 设备治疗的透明牙套患者相比，该研究中接受透明牙套治疗的患者的牙根体积平均百分比变化也无差异（P＞.05）。
在这项研究中，每 3 至 5 天更换牙套并使用附加光生物调节治疗的透明牙套患者未经历临床上相关的正畸性牙根外吸收。由于样本量小和牙根分割过程中的测量误差，结果应谨慎解释。
