Protaper Universal镍钛根管预备器械临床使用寿命分析

目的：探讨Protaper Universal镍钛根管预备锉临床使用寿命及其影响因素。方法对43套用于临床根管制备的机用Protaper Universal镍钛根管预备锉进行使用次数的计数，记录折断或解螺旋的扩大锉的号数。根据根管预备过程中顺畅性、阻力部位和器械是否折断来分析原因。结果43套机用Prota-per Universal镍钛根管预备锉共制备了964个根管，平均每套锉根管制备数为22.4个根管，其中只有5套（占11.63%）能制备25个根管及以上，未出现任何锉折断或解螺旋并被及时丢弃。结论影响Protaper Universal镍钛根管预备锉临床使用寿命的主要因素是镍钛合金的应力疲劳折断和根管钙化阻塞不畅造成器械的扭转断裂。建议临床根管预备过程中常规每套Protaper Universal根管锉制备根管数目控制在22次左右。

Analysis clinical lifespan of Protaper Universal nickel-titanium root canal preparation instruments

ObjectiveTo investigate the factors affecting clinical lifespan of Protaper Universal nickel-titanium root canals preparation instruments.MethodsThe numbers of root canals prepared by 43 sets of Protaper Universal nickel-titaniumfiles within service life were recorded. Meanwhile, the serial number of broken or unwinding of files was also recorded. The reason was analyzed based on the preparation process, resistance position and whether the equipment broken.Results964 root canals was prepared by 43 sets of Protaper Universal nickel-titanium root canals instruments, the average number of each set prepared were 22.4 root canals. Only 5 sets was capable of prepared over 25 root canals (inclusive) without broken or unwinding, which accounted for 11.63%.ConclusionBoth fatigue fracture from stress and obstruction from calcified root canal are the main factors affecting torsional fracture of Protaper Universal nickel-titanium root canals preparation instruments. Thus, the numbers of root canal prepared by each Protaper Universal conventional root canalfile in clinical should be controlled within 22 times.