Farouk Khaled, Shipley Thoas, El-Bialy Tarek
Department of Orthodontics, Faculty of Dental Medicine, Al-Azhar University, Cairo, Egypt.
Postgraduate Orthodontic Program, Adjunct Faculty, Arizona School of Dentistry and Oral Health, A. T. Still University, Mesa, AZ, USA.
J Orthod Sci. 2018 Nov 15;7:20. doi: 10.4103/jos.JOS_53_18. eCollection 2018.
To evaluate the possible change in teeth lengths as an indicator of orthodontically induced tooth root resorption (OITRR) after high-frequency mechanical vibration (HFV) treatment concurrent with Invisalign Smart Track® aligners as evaluated by cone beam computed tomography (CBCT).
The sample, composed of 30 patients with an average age of 26 ± 11 years and Class I malocclusion with an initial anterior crowding ranging from 3 to 5 mm, was divided equally into two groups; Group I received adjunctive high-frequency mechanical vibration (HFV); Group II, the control, did not receive adjunctive mechanical treatment. The maxillary incisor's teeth lengths were measured using Mimics software before (T1) and after (T2) treatment. All data were analyzed using Student's -test. Reliability testing was completed by randomly selecting 10 patients' CBCTs, and their teeth lengths were measured twice by the same investigator over a 15-day interval and compared confirming intra-operator accuracy.
The control group showed a statistically significant decrease in tooth lengths compared to the HFV group which showed nonstatistically significant change of tooth lengths.
Patients treated with HFV showed minimum tooth length changes after treatment, which may indicate that HFV can reduce OITRR with treatment using clear aligners.
通过锥形束计算机断层扫描（CBCT）评估高频机械振动（HFV）联合隐适美智能跟踪矫治器治疗后牙齿长度的可能变化，以此作为正畸诱导牙根吸收（OITRR）的指标。
样本由30例平均年龄为26±11岁、安氏I类错牙合且初始前牙拥挤度为3至5mm的患者组成，平均分为两组；第一组接受辅助高频机械振动（HFV）治疗；第二组为对照组，未接受辅助机械治疗。在治疗前（T1）和治疗后（T2）使用Mimics软件测量上颌切牙的牙齿长度。所有数据采用学生t检验进行分析。通过随机选择10例患者的CBCT完成可靠性测试，由同一位研究者在15天的间隔内对其牙齿长度进行两次测量，并进行比较以确认操作者内部的准确性。
与HFV组相比，对照组牙齿长度出现统计学上的显著下降，而HFV组牙齿长度变化无统计学意义。
接受HFV治疗的患者在治疗后牙齿长度变化最小，这可能表明HFV可在使用透明矫治器治疗时减少OITRR。
