Jyothsna Kurapati, Dodda Kiran Kumar, Vattikunta Naresh, Singamsetty Eswar Prasad, Kogila Jashva Vamsi, Saveri Katragadda, Palakolanu Sai Vyshnavi, Reddy Bharath
Department of Orthodontics & Dentofacial Orthopaedics, Drs. Sudha & Nageswara Rao Siddhartha Institute of Dental Sciences, Krishna, AP, India.
Department of Orthodontics & Dentofacial Orthopaedics, Govt Dental College RIMS Kadapa, Kadapa, AP, India.
J Orthod. 2025 Jun;52(2):162-176. doi: 10.1177/14653125241283053. Epub 2024 Nov 29.
To compare the space closure, root resorption and canine angulation during en-masse retraction of the labial segment after extraction of first premolars with or without interseptal bone reduction distal to the maxillary canines.
A single-centre, parallel randomised control trial included 16 participants with a mean age of 21.5 years. Participants were allocated into treatment groups using blocked randomisation, and blinding was employed for outcome assessors and data analysts.
The control group consisted of eight participants who underwent extraction of maxillary first premolars only, while the experimental group included eight participants who underwent interseptal bone reduction immediately after premolar extraction. En-masse retraction was performed using conventional friction mechanics with anchorage reinforcement in both groups.
Measurements of space closure were conducted over 3 consecutive months during retraction. The time taken for total space closure was recorded. Cone-beam computed tomography scans were taken before and 3 months after retraction to assess root resorption and canine angulation.
The experimental group demonstrated a significant increase in the rate of en-masse retraction compared to the control group over 3 months (mean difference [MD] = 1.09 mm, 95% confidence interval [CI] = 0.78-1.40), with an overall space closure rate of MD 0.26 mm/month (95% CI = 0.17-0.34). However, these changes were of minimal clinical significance. The change in canine angulation (MD = 4.50°, 95% CI = -1.61-10.61) did not exhibit statistical significance. Substantial root resorption was observed in six maxillary anterior teeth, with no difference between the groups.
Interseptal bone reduction is a minimally invasive surgical technique, resulting in an accelerated rate of en-masse retraction in the experimental group over 3 months. However, despite the statistical significance, the clinical impact on overall space closure was minimal, with a difference of only 0.26 mm/month observed between the groups. Interseptal bone reduction did not affect the change in canine angulation and root resorption.
比较拔除上颌第一前磨牙后，在有或没有对上颌尖牙远中牙槽间隔骨进行减骨的情况下，唇侧段整体内收过程中的间隙关闭、牙根吸收和尖牙角度变化。
一项单中心、平行随机对照试验，纳入16名平均年龄21.5岁的参与者。使用区组随机化将参与者分配到治疗组，并对结果评估者和数据分析人员采用盲法。
对照组由8名仅接受上颌第一前磨牙拔除的参与者组成，而实验组包括8名在前磨牙拔除后立即进行牙槽间隔骨减骨的参与者。两组均采用传统摩擦力学结合支抗增强进行整体内收。
在3个月的内收过程中，连续3个月测量间隙关闭情况。记录完全关闭间隙所需的时间。在治疗前和治疗后3个月进行锥形束计算机断层扫描，以评估牙根吸收和尖牙角度。
与对照组相比，实验组在3个月内整体内收速率显著增加（平均差值[MD]=1.09mm，95%置信区间[CI]=0.78-1.40），整体间隙关闭速率为MD 0.26mm/月（95%CI=0.17-0.34）。然而，这些变化的临床意义极小。尖牙角度变化（MD=4.50°，95%CI=-1.61-10.61）无统计学意义。在上颌6颗前牙中观察到明显的牙根吸收，两组之间无差异。
牙槽间隔骨减骨是一种微创外科技术，使实验组在3个月内整体内收速率加快。然而，尽管具有统计学意义，但对整体间隙关闭的临床影响极小，两组之间仅观察到每月0.26mm的差异。牙槽间隔骨减骨不影响尖牙角度变化和牙根吸收。
