Bolla Eugenio, Cozzani Mauro, Doldo Tiziana, Fontana Mattia
Via XX Settembre 20, 16121 Genova, Italy.
Int Orthod. 2012 Mar;10(1):16-28. doi: 10.1016/j.ortho.2011.12.005. Epub 2012 Jan 11.
The aim of this study was to compare bond failure and breakage rates of two types of bonded lingual orthodontic retainers (GFR and .0175" multistranded stainless steel wire [MST]) after a 6-year retention period.
Eighty-five young adults were randomly divided into two groups: 40 subjects received 48 GFR retainers (14 maxillary and 34 mandibular retainers), and 45 subjects received 50 MST retainers (18 maxillary and 32 mandibular retainers). A Fisher's exact test was performed in order to identify significant differences in the percentage of detachment and breakage of the retainers between the groups.
The maxillary detachment rates were 21.42% for the GFR group and 22.22% for the MST group; the mandibular detachment rates were 11.76% for the GFR group and 15.62% for the MST group. The maxillary breakage rates were 7.14% for the GFR group and 16.66% for the MST group; the mandibular breakage rates were 8.82% for the GFR group and 15.62% for the MST group. The differences were not statistically significant.
GFR and multistranded stainless steel retainers showed similar results in terms of bond failure and breakage after 6 years of retention. The use of GFR retainers as a retention strategy should not be discouraged and could be considered a viable esthetic alternative to stainless steel wire retainers.
本研究旨在比较两种类型的舌侧正畸保持器（GFR和0.0175英寸多股不锈钢丝[MST]）在6年保持期后的粘结失败率和断裂率。
85名年轻成年人被随机分为两组：40名受试者接受48个GFR保持器（14个上颌和34个下颌保持器），45名受试者接受50个MST保持器（18个上颌和32个下颌保持器）。进行Fisher精确检验，以确定两组之间保持器脱落和断裂百分比的显著差异。
GFR组上颌脱落率为21.42%，MST组为22.22%；GFR组下颌脱落率为11.76%，MST组为15.62%。GFR组上颌断裂率为7.14%，MST组为16.66%；GFR组下颌断裂率为8.82%，MST组为15.62%。差异无统计学意义。
GFR和多股不锈钢保持器在6年保持期后的粘结失败和断裂方面显示出相似的结果。不应不鼓励使用GFR保持器作为一种保持策略，并且可以认为它是不锈钢丝保持器的一种可行的美观替代方案。
