Salehi Parisa, Zarif Najafi Hooman, Roeinpeikar Seyyed Mehdi
Orthodontics Research Center, Department of Orthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
Prog Orthod. 2013 Sep 11;14:25. doi: 10.1186/2196-1042-14-25.
The aim of this prospective clinical study was to compare the mean durability and the failure rates of two types of orthodontic retainers.
Orthodontic patients (142) aged between 14 and 28 years were recruited in this study. The polyethylene woven ribbon (Ribbond, Seattle, WA, USA) retainer was compared with a 0.0175-in flexible spiral wire (Respond, Ormco, Glendora, CA, USA) retainer. When treatment was completed, the retainers were bonded from canine to canine in the maxillary and the mandibular arches of the participants. In the follow-up visits, the patients were re-evaluated every 3 months over a period of 18 months. The time taken for the retainers to remain without any fracture was appraised. Kaplan-Meier analysis and the logrank test were employed to identify significant differences in the survival functions between the groups. The rates of the retainers' failure between the groups were analyzed using Chi-square test.
It was revealed that the mean survival of the flexible spiral wire retainer was 15.34±0.47 and 15.60±0.42 months in the maxillary and mandibular arches, respectively. The mean survival of the ribbon retainer was 13.95±0.55 and 14.26±0.57 months in the maxillary and mandibular arches, respectively. Ribbon retainers showed a failure rate of 50% in the maxillary and 42.6% in the mandibular arches. Flexible spiral retainers showed a failure rate of 36.5% in the maxillary and 37.8% in the mandibular arches. The differences were not statistically significant. Regarding the evaluation period, the differences had limited clinical significance.
The mean survival time and the failure rates of the polyethylene woven ribbon retainer were comparable to the flexible spiral wire retainer during the 18 months after orthodontic treatment.
这项前瞻性临床研究的目的是比较两种类型正畸保持器的平均耐用性和失败率。
本研究招募了14至28岁的正畸患者（142名）。将聚乙烯编织带（Ribbond，美国华盛顿州西雅图）保持器与0.0175英寸柔性螺旋丝（Respond，美国加利福尼亚州格伦多拉奥美科）保持器进行比较。治疗完成后，在参与者的上颌和下颌牙弓中从尖牙到尖牙粘结保持器。在随访中，在18个月的时间里每3个月对患者进行重新评估。评估保持器无任何断裂的持续时间。采用Kaplan-Meier分析和对数秩检验来确定两组之间生存函数的显著差异。使用卡方检验分析两组之间保持器的失败率。
结果显示，柔性螺旋丝保持器在上颌和下颌牙弓中的平均生存时间分别为15.34±0.47个月和15.60±0.42个月。编织带保持器在上颌和下颌牙弓中的平均生存时间分别为13.95±0.55个月和14.26±0.57个月。编织带保持器在上颌的失败率为50%，在下颌为42.6%。柔性螺旋保持器在上颌的失败率为36.5%，在下颌为37.8%。差异无统计学意义。就评估期而言，差异具有有限的临床意义。
正畸治疗后18个月内，聚乙烯编织带保持器的平均生存时间和失败率与柔性螺旋丝保持器相当。
