牙冠延长与牙龈切除对桩冠修复疗效的影响

Restorative effects of crown lengthening surgery and gingivectomy on dowel crown of deep-seated subgingival teeth fracture

目的比较牙冠延长术与牙龈切除术对前牙残根桩冠修复后疗效的影响。方法选取残根断面距牙槽嵴顶距离<3 mm的患牙54颗,其中28颗行牙冠延长术,26颗行牙龈切除术,术后2周患牙核桩冠修复,评价术后2周手术疗效及修复后6个月牙周健康状况。结果牙冠延长术组手术效果好于牙龈切除术组,差异有显著性意义(P<0.05);桩冠修复后6个月,牙冠延长术组牙周炎症发生率明显低于牙龈切除术组,差异有显著性意义(P<0.05),未出现修复体松动、脱落。结论牙冠延长术能够有效恢复患牙生物学宽度,有利于修复后维持牙周健康。

Objective To compare the restorative effects of crown lengthening surgery and gingivectomy on dowel crown of deep-seated subgingival teeth fracture. Methods Fifty-four teeth were selected and divided into the crown lengthening surgery group （n = 28） and gingivectomy group （n = 26）. Two weeks later after surgery, the teeth were regularly restored by dowel crown. Then, the clinical effects were compared by measuring the depths of gingival pocket at the time of two weeks and six months after operation, and the results were evaluated by χ^2 test. Results Two weeks after operation, the effective rate of the gingivectomy group was much less than the rate of the crown lengthening surgery group （ P 〈 0. 05 ）. Six months after operation, the occurrence rate of periodontitis in the gingivectomy group was significantly higher than that in the crown lengthening surgery group （P 〈 0. 05 ）. Conclusion According to the biologic width principle, crown lengthening surgery can conserve these teeth with subgingivally involved defect, and has a good, long-time clinical effect.