Ashok Thrishna, Ammayappan Pavithranand, Alexander Lidhiya, Kengadaran Shivashankar, Kumar Praveen
Department of Orthodontics, Indira Gandhi Institute of Dental Sciences, Pondicherry, India.
Department of Public Health Dentistry, Indira Gandhi Institute of Dental Sciences, Pondicherry, India.
J Orthod Sci. 2024 Nov 25;13:42. doi: 10.4103/jos.jos_39_24. eCollection 2024.
BACKGROUND/OBJECTIVE: Resolution of crowding remains a chief concern for patients seeking orthodontic treatment. The choice of the initial aligning archwire is crucial for achieving treatment success. Nickel-titanium (NiTi) archwires have been the first choice since their introduction. Multi-force archwires are a recent development that claims to deliver optimal orthodontic force tailored to specific teeth. The aim of this study was to compare the clinical efficiency of SmartArch archwires with conventional and thermoelastic NiTi.
Thirty-nine patients were randomly allocated into three groups (group 1: NiTi, group 2: Cu-NiTi, and group 3: SmartArch). Only patients with Little's irregularity index of >4 mm were included. Study models were fabricated at each time interval of four weeks (T0, T1, T2, and until decrowding). The reduction in the irregularity score was calculated and analyzed using the Shapiro-Wilk and Kolmogorov-Smirnov tests, the Kruskal-Wallis test, the Kaplan-Meier method to create a survival curve, and Mantel-Cox log-rank test to compare survival times.
The Little's irregularity index reduced with treatment in all patients, irrespective of the groups, with no significant difference ( = 0.467) in the reduction among the groups evaluated. On average, it took 10.77 ± 2.52 weeks for group 1, 11 ± 4.22 weeks for group 2, and 9.54 ± 2.6 weeks for group 3. Patients with rotated canines took a longer duration to achieve decrowding, irrespective of the archwires used.
This study found no clinically significant difference in the efficiency of decrowding among the archwires.The study was approved by the Institutional Review Board and Institutional Ethical Committee (IGIDSIEC2021NRP13PGTHODO) and registered under the Clinical Trial Registry (CTRI/2021/09/036859) of India.
背景/目的：牙列拥挤的矫治仍是寻求正畸治疗患者的主要关注点。初始排齐弓丝的选择对于治疗成功至关重要。自镍钛（NiTi）弓丝问世以来一直是首选。多力弓丝是最近的一项进展，声称能提供针对特定牙齿量身定制的最佳正畸力。本研究的目的是比较SmartArch弓丝与传统及热弹性NiTi弓丝的临床效率。
39例患者被随机分为三组（第1组：NiTi弓丝组，第2组：铜镍钛弓丝组，第3组：SmartArch弓丝组）。仅纳入Little不整齐指数>4mm的患者。在四周的每个时间间隔（T0、T1、T2以及直到牙列排齐）制作研究模型。使用Shapiro-Wilk检验、Kolmogorov-Smirnov检验、Kruskal-Wallis检验、Kaplan-Meier方法绘制生存曲线以及Mantel-Cox对数秩检验来计算和分析不整齐分数的降低情况，并比较生存时间。
所有患者无论所属组别，其Little不整齐指数均随治疗降低，在评估的各组间降低情况无显著差异（P = 0.467）。平均而言，第1组需要10.77±2.52周，第2组需要11±4.22周，第3组需要9.54±2.6周。无论使用何种弓丝，尖牙扭转的患者达到牙列排齐所需时间更长。
本研究发现不同弓丝在牙列排齐效率方面无临床显著差异。本研究获得机构审查委员会和机构伦理委员会批准（IGIDSIEC2021NRP13PGTHODO），并在印度临床试验注册中心（CTRI/2021/09/036859）注册。
