超声取分离镍钛锉时发生断裂的实验研究  

Fracture of the separated nickel titanium instruments during ultrasonic removal:An experimental study

作　　者：张平[1] 黎远皋[1] 张雪梅[1] 张晗[1] 

机构地区：[1]北京大学第三医院口腔科,北京100191

出　　处：《华西口腔医学杂志》2012年第1期29-31,共3页West China Journal of Stomatology

摘　　要：目的评价超声法取分离的镍钛根管锉时超声功率及水对镍钛根管锉发生断裂的影响。方法选择40支临床弃用的和10支新的镍钛根管锉建立分离器械模型。使用超声工作尖在6或10两种功率和有水或无水冲洗两种状态下分别对临床弃用的分离器械进行振动,在功率10和无水冲洗状态下对新的分离器械进行振动,记录器械发生断裂的时间。结果在有水或无水冲洗两种状态下,低功率发生断裂的时间都显著长于高功率;在6或10两种功率下,有水冲洗状态发生断裂的时间都显著长于无水冲洗状态。新的分离器械发生断裂的时间显著长于临床弃用的分离器械。结论有水冲洗可降低分离的镍钛器械断裂的发生。临床上应避免在高功率无水冲洗状态下使用超声取分离的镍钛器械。Objective This in vitro study is to evaluate the effect of ultrasonic power settings and cooling methods on fracture behavior of the separated nickel titanium instruments during ultrasonic removal. Methods 40 discarded and 10 new nickel titanium instruments were used to establish the separated instrument removal model. The discarded instruments were divided into four groups according to two ultrasonic power settings （6 or 10） and different cooling methods （using water coolant or without using water coolant）, and all the new instruments were put into the group in which ultrasonic vibration was used at a higher power setting（10） without using water coolant. The time reqaired for fracture of the separated instruments was recorded. Results The time was longer with statistical significance at a lower power setting compared with that at a higher power setting regardless of the use of water coolant. The time was longer with statistical significance by the use of water coolant compared with that without using coolant regardless of power settings （6 or 10）. The time required for fracture of the new instruments was longer than that of the discarded in- struments with statistical significance. Conclusion During ultrasonic removal of separated nickel titanium instruments, water coolant could decrease the occurrence of fracture. When removing separated nickel titanium instruments with ultrasonic vibration, an attempt without coolant shouldn＇t be made at a higher power setting.

关 键 词：超声 镍钛器械 分离器械 

分 类 号：R781.05[医药卫生—口腔医学]