牙本质肩领对前牙残根修复效果影响的临床研究

目的 比较研究牙本质肩领对前牙残冠残根桩核修复疗效的影响。方法 选取前牙残冠残根患者56例，共计68颗患牙。所有病例经预成纤维桩核修复后，根据剩余牙体组织量在残根颈部制备一定高度的牙本质肩领（0~1 mm、1~2 mm、大于2 mm），并给予常规烤瓷冠修复。随访观察2~5年，统计各组残根的治疗成功率并进行统计学分析。结果 牙本质肩领高度在0~1 mm、1~2 mm和大于2 mm的残根治疗成功率分别为60.0%（12/20）、96.8%（30/31）和100%（17/17）。经χ2检验，0~1 mm肩领组与1~2 mm肩领组（P=0.003）、0~1 mm肩领组与大于2 mm肩领组（P=0.010）相比，在治疗成功率方面均具有显著性差异；1~2 mm肩领组与大于2 mm肩领组相比，则无统计学意义（P=0.76）。结论 在残根颈部制备1 mm以上高度的牙本质肩领，可以显著提高残冠残根的治疗成功率。

A clinical study on the effect of ferrule length on the survival of pulpless residual roots restored with prefabricated fiber post and core system

Objective To evaluate the effect of ferrule length on the survival of residual crown and roots restored with prefabricated fiber post and core system. Methods 68 defect teeth of residual crown and roots from 56 patients were collected in this study. After prefabricated fiber post and core restoration,all teeth were prepared with different ferrule lengths (0~1 mm,1~2 mm,more than 2 mm) and restored with ceramic crowns. The success rate of prostheses was observed after 2 to 5 years and the data was analyzed by χ2 test. Results The success rates for roots with the ferrule length among 0~1 mm,1~2 mm and more than 2 mm were 60% (12/20),96.8% (30/31) and 100% (17/17) respectively. There were significant differences between roots with ferrule length of 0 to 1 mm and roots with ferrule length of more than 1 mm(P＜0.05). Conclusions More than 1 mm ferrule length will significantly increase the success rate of pulpless residual roots. 