压膜保持器与改良HawleyⅡ型保持器联合应用对正畸保持效果的临床研究

Clinical evaluation of vacuum-formed retainer combined with modified Hawley Ⅱ retainer

目的通过比较正畸矫治完成后两种保持方式在保持效果、牙周健康两方面的异同,评价联合应用压膜保持器与改良HawleyⅡ型保持器的临床效果。方法选择航天中心医院口腔科正畸固定矫治结束后病例80例,随机分为两组,每组40例。联合组日间戴用压膜保持器,夜间戴用改良HawleyⅡ型保持器;压膜组全天均戴用压膜保持器。两组患者在拆除固定矫治器当天及戴用保持器12个月取记存模型对比研究,评价保持效果;在戴用保持器1个月、3个月、6个月和12个月分别检查记录牙周指数,评价牙周健康状况,比较两种保持方式效果的异同。结果反映保持效果的各指标在保持器戴用12个月后,两组间未见到统计学差异(P>0.05);反映牙周健康状况的指标中牙龈指数和菌斑指数在保持器戴用3个月、6个月及12个月,牙石指数在保持器戴用12个月时联合组低于压膜组,差异具有统计学意义(P<0.05)。结论压膜保持器与改良HawleyⅡ型保持器联合应用与单独应用压膜保持器均可达到良好的保持效果;在牙周健康方面,联合组对牙周健康的影响较压膜组小,但两组均出现了一定程度的牙龈炎症。

Objective To investigate the clinical effectiveness of vacuum-formed retainers combined with modified Hawley Ⅱ retai-ners by observing the retainment effect and peridontal condition.Methods Eighty malocclusion cases after orthodontic treatment from Department of Stomatology in Aerospace Center Hospital,were randomly divided into two groups：combination group and control croup.The patients in combination group wore the vacuum-formed retainers in the day time and modified Hawley Ⅱ retainers in the night time,while the patients in control group wore the vacuum-formed retainers all day long.Study models were fabricated for each patient at the day of debond and 12th month of retention.Effectiveness and periodontal health were evaluated by testing the periodontal index at the 1st,3rd,6th and 12th month of wearing the retainers.Results There was no statistically significant difference in retainment effect between two groups （P ＞0.05）.Gingival index and plaque index were lower in combination group than in control group at the 3rd,6th and 12th month of retention （P ＜ 0.05）.Calculus index was lower in combination group than in control group at 12th month of retention （P ＜ 0.05）.Conclusion Both vacuum-formed retainers and vacuum-formed retainers combined with modified Hawley Ⅱ retainers have good retention effects during the 12-month retention period,but the combination method has less effect on periodontal health.