目的 评估新型压低下颌磨牙矫治器压低下颌磨牙的疗效及应用价值.方法 选择7例需要压低下颌磨牙治疗的前牙开患者,治疗前、后通过临床检查、牙颌模型分析及采用Winceph7.0数字化X线片分析软件测量头颅侧位片,评价临床压入效果,使用SPSS 17.0统计软件包对数据进行分析.结果 7例患者经过平均4个月的治疗,均取得比较明显的治疗效果.治疗前、后头影测量分析表明:下颌第一磨牙的平均压入量为(1.92±0.44)mm,矫治前、后相对于基准平面(MP平面)的垂直距离差异有统计学意义(P<0.05).上颌第一磨牙平均压入量为(0.36±0.25)mm,矫治前、后相对于基准平面(PP平面)的垂直距离差异没有统计学意义(P>0.05).X片显示被压低的下颌磨牙未出现明显的牙根吸收.结论 新型下颌磨牙压低矫治器用于压入下颌磨牙治疗前牙开畸形效果明显,压入治疗未引起明显的牙周及牙根损害.%Objective To evaluate the effects and clinical application of molar intrusion with a new mandibular mo-lar intrusion appliance. Methods 7 patients who needed mandibular molars intrusion to correct open-bite were select-ed. To evaluate effects of molar intrusion, clinical examination, dental model analysis and aphalometric analysis by Win-ceph 7.0 software were used before and after intrusion treatment, SPSS 17.0 software was used for data analysis. Re-sults All the mandibular molars were intruded successfully in an average time of 4.0 months. Cephalometric analysis before and after treatment showed that the average amount of mandibular first molars intrusion were (1.92 ± 0.44) mm . The vertical distance to the reference plane (MP plane) per and post treatment was statistically significant ( P < 0.05). The average amount of maxillary first molar intrusion was (0.36 ± 0.25) mm, with no significant difference in vertical distances to reference plane (PP plane) (P>0.05). No signs of root resorption was obsersed in radiograph of the intrud-ed mandibular molars. Conclusion The new mandibular molar intrusion appliance has a remarkable clinical effect in correcting anterior open bite without obvious periodontal tissue damage and root resorption. teeth intrusion with the new appliance has a significant effect without apparent destruction of the periodontal tissue and root resorption.
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