期刊
JOURNAL OF DENTAL RESEARCH
卷 90, 期 10, 页码 1197-1201出版社
SAGE PUBLICATIONS INC
DOI: 10.1177/0022034511415274
关键词
orthodontic retainer; survival analysis; adolescent; randomized controlled trial; Hawley retainer; clear overlay retainer
资金
- Science and Technology Department of Sichuan Province [2008SG0018]
The objectives of this study were to compare the survival time of the Hawley retainer (HR) and the clear overlay retainer (COR) over one-year follow-up and to analyze risk factors contributing to their breakage. In this randomized, controlled clinical trial, we assigned 120 adolescent patients to receive either the HR or the COR. All specific data on breakage dates, the reasons for breakage, and the broken parts of the retainers were recorded. A survival analysis was used to describe retainer survival over time. No significant differences were observed in survival times between the 2 groups for either the maxillary retainer (p = 0.254) or the mandibular retainer (p = 0.188). Both retainers tended to fracture, but the fracture locations were different. The findings indicate that clinicians should avoid increasing buccal root torque and reinforce the retainer base plates. Breakage rates may not influence the choice of retainer.
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