Department of Orthodontics, Faculty of Dentistry, University of Hacettepe, Ankara, Turkey.
Eur J Orthod. 2012 Aug;34(4):470-4. doi: 10.1093/ejo/cjr038. Epub 2011 Apr 20.
Bonded retainers are considered reliable, independent of patient co-operation, and highly efficient. However, most studies regarding the survival of retainers are retrospective. The aims of this investigation were to prospectively evaluate the failure rate of bonded lingual retainers, the influence of direct or indirect bonding procedures on survival, and to determine the distribution of failures over a 6 month period. Mandibular lingual retainers were bonded in 66 patients. Thirty-two retainers were bonded using a direct method and 34 by an indirect method. There were 23 females and 9 males (mean age 15.96 ± 3.21 years) in the direct group and 29 females and 5 males (mean age 19.44 ± 6.79 years) in the indirect group. A 0.016 × 0.022 inch Bond-a-Braid retainer wire (eight-braided, flattened, stainless steel dead soft wire) was used with Transbond LR. Following bonding, the patients were observed monthly. A chi-square test was used to analyse the influence of the direct and indirect procedures on survival rate.Twenty-five retainers failed. The failure rate was 46.9 per cent with the direct method and 29.4 per cent with the indirect method. The difference between the methods was not statistically significant. The total failure rate was 37.9 per cent. The highest failure rate was seen in the first month. Seven patients had repeated failures. The failure rate was higher in the right quadrant. The total survival rate was 62.1 per cent.
带环保持器被认为是可靠的，不受患者合作的影响，并且效率很高。然而，大多数关于保持器存活率的研究都是回顾性的。本研究的目的是前瞻性评估粘结舌侧保持器的失败率、直接或间接粘结程序对存活率的影响，并确定 6 个月期间失败的分布情况。在 66 名患者中粘结了下颌舌侧保持器。32 个保持器采用直接法粘结，34 个采用间接法粘结。直接组有 23 名女性和 9 名男性（平均年龄 15.96 ± 3.21 岁），间接组有 29 名女性和 5 名男性（平均年龄 19.44 ± 6.79 岁）。使用 0.016×0.022 英寸的 Bond-a-Braid 保持器丝（八股编织、扁平、不锈钢软丝）和 Transbond LR。粘结后，每月观察患者。使用卡方检验分析直接和间接程序对存活率的影响。25 个保持器失败。直接法的失败率为 46.9%，间接法的失败率为 29.4%。两种方法之间的差异无统计学意义。总的失败率为 37.9%。第一个月的失败率最高。7 名患者出现反复失败。右侧象限的失败率更高。总的存活率为 62.1%。
