Joshi Rishi, Shyagali Tarulatha Revanappa, Jha Ruchi, Gupta Abhishek, Tiwari Anil, Tiwari Tanvee
Department of Orthodontics and Dentofacial Orthopedics, Hitkarini Dental College and Hospital, Jabalpur, Madhya Pradesh, India.
Int J Appl Basic Med Res. 2021 Apr-Jun;11(2):100-105. doi: 10.4103/ijabmr.IJABMR_191_20. Epub 2021 Apr 8.
Orthodontic miniscrews are used for the purpose of conservation of anchorage.
The aim of the study was to evaluate the orthodontic miniscrew failure between the elastomeric chain-supported retraction and stainless steel (SS) ligature-aided retraction.
This was a cross-sectional split mouth randomized controlled trial.
The sample (30) was divided equally among the control group and the experimental group (15 each). Miniscrews were placed between second premolar and the first molar of maxilla. The experimental group was based on the split mouth technique wherein right or left side of the maxillary arch was treated using either an elastomeric power chain (EPC) engaged to the miniscrews directly (Group 1) or an EPC engaged indirectly to miniscrews with the help of SS ligature wire (Group 2). In control group, implants were placed in maxilla without any retraction force. Clinical signs of inflammation was assessed at the following interval; 7 day, 14 day, 1 month, 2 month, and at the time of removal of implant.
Kruskal-Wallis ANOVA test was used.
Mean rank of gingival inflammation was 28.33 at the 1-month interval in Group 1 and inflammation remained high in the this group for all time intervals in comparison to Group 2. Group 2 showed highest mean rank of inflammation of 26.10 at 7 day. In control group, the inflammation remained low at all the time intervals. Moreover, the difference noted was statistically significant.
The gingival inflammation around the peri-implant tissue with the application of EPC at various interval remained high in comparison to the EPC with SS group. The gingival inflammation in the control group was very less, and it remained less throughout the different time periods.
正畸微螺钉用于支抗的保留。
本研究的目的是评估弹性链支持的内收和不锈钢结扎辅助内收之间正畸微螺钉的失败情况。
这是一项横断面口内分侧随机对照试验。
样本（30例）平均分为对照组和实验组（每组15例）。微螺钉植入上颌第二前磨牙和第一磨牙之间。实验组基于口内分侧技术，其中上颌牙弓的右侧或左侧采用直接与微螺钉连接的弹性动力链（EPC）（第1组）或借助不锈钢结扎丝间接与微螺钉连接的EPC进行治疗（第2组）。对照组在上颌植入种植体但不施加任何内收力。在以下时间间隔评估炎症的临床体征：7天、14天、1个月、2个月以及种植体取出时。
采用Kruskal-Wallis方差分析检验。
第1组在1个月时牙龈炎症的平均秩次为28.33，与第2组相比，该组在所有时间间隔的炎症水平均较高。第2组在7天时炎症的平均秩次最高，为26.10。对照组在所有时间间隔的炎症水平均较低。此外，观察到的差异具有统计学意义。
与使用不锈钢结扎丝的EPC组相比，在不同时间间隔应用EPC时，种植体周围组织的牙龈炎症水平较高。对照组的牙龈炎症非常少，并且在不同时间段内一直保持较低水平。
