Department of Orthodontics, Alnoor Hospital, Ministry of Health, Makkah, Saudi Arabia.
Department of Endodontics, Faculty of Dentistry, King Abdul Aziz University, Jeddah, Saudi Arabia.
BMC Oral Health. 2021 Jan 13;21(1):28. doi: 10.1186/s12903-020-01382-2.
Orthodontic treatment may result in undesirable side effects, such as root resorption and a decrease in the size of the pulp tissue which could be associated with the duration of the orthodontic treatment. Piezocision-assisted tooth movement was introduced as a minimally invasive surgical procedure to shorten orthodontic treatment time. This prospective randomized clinical trial was aimed to compare the pulp volume changes of maxillary anterior teeth after en-masse retraction with or without piezocision-assisted orthodontics.
Patients who required orthodontic treatment with bilateral maxillary first premolar extractions and en-masse retraction were recruited. Patients were randomly divided into extraction with piezocision, or only extraction, serving as controls. Pulp volume and root length changes of the maxillary six anterior teeth were measured and compared between the two groups using a 3-Dimensional analytical software. Paired and independent sample t-tests were used to compare within and between groups. Bivariate correlation was done between the mean change in pulp volume and its corresponding root length. The significance level was set at α = 0.05.
A total of 23 patients were included, 12 in the piezocision, and 11 in the control group. At the end of the en-masse retraction phase, (mean = 122.74 ± 3.06 days) pulp volume was significantly decreased in all six anterior teeth in both groups (P < 0.01). The decrease in pulp volume was not statistically different between both groups, (P > 0.05). There was a statistically significant but moderate correlation only between the pulp volume change of the right canine and its root length, r = 0.44, P = 0.034.
The effect of piezocision-assisted orthodontic tooth movement on the pulp volume was comparable to the conventional orthodontic treatment. The degree of change in pulp volume does not appear to be related to the amount of root resorption. Trial registration NCT03180151. Registered December 25, 2016, retrospectively registered, https://clinicaltrials.gov/ct2/show/record/NCT03180151 .
正畸治疗可能会产生不良的副作用，如牙根吸收和牙髓组织体积减小，这可能与正畸治疗的时间有关。超声骨刀辅助牙齿移动作为一种微创外科手术，被引入以缩短正畸治疗时间。本前瞻性随机临床试验旨在比较整体内收治疗中应用与不应用超声骨刀辅助正畸治疗对上颌前牙牙髓体积变化的影响。
纳入需要双侧上颌第一前磨牙拔除和整体内收的正畸治疗患者。患者被随机分为超声骨刀辅助拔牙组或仅拔牙组，作为对照组。使用三维分析软件测量并比较两组上颌六前牙的牙髓体积和根长变化。采用配对和独立样本 t 检验比较组内和组间差异。对牙髓体积的平均变化与其相应根长进行双变量相关分析。显著性水平设为α=0.05。
共纳入 23 例患者，超声骨刀组 12 例，对照组 11 例。在整体内收阶段结束时（平均时间=122.74±3.06 天），两组所有六颗前牙的牙髓体积均显著减少（均 P<0.01）。两组间牙髓体积减少无统计学差异（P>0.05）。仅在右侧尖牙的牙髓体积变化与其根长之间存在统计学显著但中度相关，r=0.44，P=0.034。
超声骨刀辅助正畸牙齿移动对牙髓体积的影响与传统正畸治疗相当。牙髓体积变化的程度似乎与牙根吸收的量无关。试验注册 NCT03180151。于 2016 年 12 月 25 日注册，回溯注册，https://clinicaltrials.gov/ct2/show/record/NCT03180151。
