压入伸长磨牙可摘矫治器的初步临床应用研究

目的：评估可摘矫治器压入伸长磨牙的疗效及临床应用价值.方法：选择7例采用可摘矫治器压入伸长磨牙的患者.治疗前、后通过牙颌模型分析、临床牙周检查及采用CygnusRay2TM数字化X线片分析软件测量根尖片,评价临床压入效果,评估压入治疗后的牙周情况及根吸收情况.使用SAS6.12统计软件包对数据进行分析.结果：7例患者经过平均3.7个月的治疗,均取得比较明显的治疗效果.治疗前、后模型分析显示,最大压入量为3.05mm,最小1.03mm,月平均压入量为0.58mm.治疗前、后牙周探诊深度、近远中牙体长度、近远中釉牙骨质界至牙槽嵴顶距离的差异均无统计学意义（P＞0.05）.结论：可摘矫治器用于压入伸长磨牙有明显的治疗效果,压入治疗未引起明显的牙周及牙根损害.

Preliminary clinical study on intrusion of overerupted molars with a removable appliance

PURPOSE: To evaluate the clinical effect of molar intrusion with a removable appliance and determine its clinical value. METHODS: Seven patients were selected in the study .The clinical effect of intrusion was evaluated,the periodontal attachments and root resorption post-treatment were accessed by models,clinical examination, periapical radiograph analysis via CygnusRay2TM digital X-ray system pre and post-treatment.The data was analyzed using SAS6.12 software package. RESULTS: All the overerupted molars had been intruded successfully within an average time of 3.7 months.Pre and post -treatment model analysis demonstrated the maximum intrusion amount was 3.05mm,minimum 1.03mm and mean 0.58mm per month.Analysis of pre and post-treatment periapical radiographs and periodontal probing depth showed no significant difference in probing depth,distance from cemento-enamel junction to alveolar bone crest, mesial and distal tooth length between pre- and post-treatment (P>0.05). CONCLUSIONS: Molar intrusion with the removable appliance has a significant effect without apparent destruction of the periodontal tissue and root resorption.