正畸牵引在前牙龈下牙折的临床应用

目的分析与探讨正畸颌向牵引对龈下牙折的临床效果。方法龈下牙折患者17例,共18颗患牙,断端均位于龈缘下2~5 mm。经完善的根管治疗后2周,黏接方丝托槽开始正畸牵引,使其达到直接修复高度,牵引后保持3个月行修复治疗。测量分析不同阶段根尖片上断根根尖区相对骨密度改变。结果 18颗患牙经正畸牵引1~2个月后,断端伸长2~5 mm,保持3个月后,无明显松动,通过烤瓷冠修复均达到理想的美观效果。牵引后保持3个月,根尖区骨密度基本达到正常水平。半年后随访,牙周正常未见异常及复发。结论正畸牵引可有效用于龈下牙折病人的修复前牙根牵引,疗效可靠。

Clinical application of the effect of orthodontic traction on anterior teeth with subgingival root fracture

Objective To summarize and analyze the clinical effect of orthodontic traction by means of edgewise fixed appliance for anterior teeth with subgingival root fracture.Methods 18 fractured anterior teeth in 17 patients extended 2-5mm below the gingival line were selected.Two weeks after complete root canal therapy,edgewise brackets were agglutinated and orthodontic traction was performed for restoration of tooth height.After the extrusion completed,the tooth had been stabilized and held for 3 months.The bone density changes in the apical area were measured and analyzed.Results It need about 1-2months to see 2-5mm displacement distance in anterior teeth of 18 patients.After 3 months retention the location was stable.The incisor was restored with all ceramic crowns.Optimal esthetic was achieved when restoration was performed after orthodontic extrusion.The bone density in the apical area approached normal value within 3 months after treatment.At 6-month follow-up,the periodontal tissues were normal and neither luxation nor relapse was noted.Conclusion Tooth traction method with edgewise appliance is an effective method for anterior teeth with subgingival root fracture.