Andrén A, Asplund J, Azarmidohkt E, Svensson R, Varde P, Mohlin B
County Orthodontic Clinic, Mariestad, Sweden.
Swed Dent J. 1998;22(3):123-31.
The majority of patients from 4 orthodontic clinics in the south west of Sweden who have had bonded retainers on upper or lower anterior teeth for a period of at least 5 years were examined. The total failure rate during 5 years of observation was 36 per cent, slightly higher in the maxilla than in the mandible. The retainer had become detached in 15 per cent of the teeth bonded. The failure rate decreased during the 5 year period of observation. Seven fractures were reported, all in the upper front teeth. The failure rate was reduced when the retainers were positioned incisally, when larger diameter wires were used and in the 12 cases where a groove had been cut into the enamel to accept the retainer. The findings suggest that a limited flexibility of the retainer may be an advantage. In about 20 per cent of the retained segments minor rotations and small areas of space opened between some of the teeth attached to the retainer. No new caries lesions were found on any of the teeth associated with the bonded retainers during the period of observation.
对瑞典西南部4家正畸诊所中，在上颌或下颌前牙佩戴粘结式保持器至少5年的大多数患者进行了检查。在5年的观察期内，总失败率为36%，上颌的失败率略高于下颌。在粘结的牙齿中，15%的保持器已脱落。在5年的观察期内，失败率有所下降。报告了7例骨折，均发生在上颌前牙。当保持器位于切端、使用较大直径的钢丝以及在12例在牙釉质上切槽以容纳保持器的情况下，失败率降低。研究结果表明，保持器有限的柔韧性可能是一个优点。在约20%的保持节段中，附着在保持器上的一些牙齿之间出现了轻微旋转和小面积间隙。在观察期内，与粘结式保持器相关的任何牙齿上均未发现新的龋损。
