Qudeimat M A, Fayle S A
Department of Child Dental Health, Leeds University, UK.
Pediatr Dent. 1998 Jul-Aug;20(4):267-72.
This retrospective study investigated the longevity of 301 space maintainers fitted in 141 patients aged 3.4-22.1 years in the Department of Pediatric Dentistry at Leeds Dental Institute between 1991 and 1995.
Failure occurred in 190 space maintainers (63%), of which 36% were due to cement loss, 24% breakage, 10% design problems, and 9% were lost. Using the life table method, the median survival time (MST) for space maintainers was found to be 7 months. Band and loop (B&L) appliances had the highest MST of 13 months, while the lower lingual holding arch (LLHA) had the lowest of 4 months. Unilateral space maintainers survived longer than bilateral space maintainers (MST of 13 months vs. 5 months). Left B&Ls had a MST of 16 months, compared to only 4 months for right B&Ls, Gender, age, arch in which the appliance was placed, the operator planning it, fixed vs. removable, and adequacy of pretreatment assessment did not have a significant effect on survival time.
这项回顾性研究调查了1991年至1995年间在利兹牙科研究所儿童牙科为141名年龄在3.4至22.1岁的患者安装的301个间隙保持器的使用寿命。
190个间隙保持器（63%）出现故障，其中36%是由于粘固剂脱落，24%是破损，10%是设计问题，9%是丢失。采用寿命表法，间隙保持器的中位生存时间（MST）为7个月。带环和圈簧（B&L）矫治器的MST最高，为13个月，而下颌舌弓（LLHA）矫治器的MST最低，为4个月。单侧间隙保持器的存活时间比双侧间隙保持器长（MST分别为13个月和5个月）。左侧B&L矫治器的MST为16个月，而右侧B&L矫治器仅为4个月。性别、年龄、矫治器放置的牙弓、计划放置的操作者、固定与活动矫治器以及治疗前评估的充分性对生存时间均无显著影响。
