不同往复运动单支镍钛锉根管预备后预备效率、根尖碎屑推出量及牙根微裂情况比较的体外研究

In vitro study on the comparison of the preparation efficiency,the amount of apical debris and the root micro-cracks after root canal preparation with different rotary nickel-titanium single-file reciprocating motion system

目的:比较Waveone Gold与Reciproc Blue两种往复运动单支镍钛锉根管预备后的预备效率、根尖碎屑推出量及牙根微裂情况。方法:选取由于正畸减数拔牙需要,拔除的根尖发育成熟的60颗离体下颌前磨牙为研究对象。按照根管预备方法不同将60颗离体牙分为Waveone Gold组与Reciproc Blue组,每组各30颗。比较两组预备时间、根管弯曲度、根尖碎屑推出量、牙根微裂发生情况及中心定位能力。结果:Waveone Gold组根管预备时间较Reciproc Blue组减少(P<0.05)。预备后,两组根管弯曲度略低于预备期前,但差异无统计学意义(P>0.05)。两组根尖碎屑推出量比较,差异无统计学意义(P>0.05)。Waveone Gold组、Reciproc Blue组分别有5颗、3颗牙出现裂纹,均为不完全裂,Reciproc Blue组牙根微裂发生率略低于Waveone Gold组,但差异无统计学意义(P>0.05)。两组在在距离根尖2、4、6 mm测量点处的轴中心率比较,差异均无统计学意义(P>0.05)。结论:Waveone Gold与Reciproc Blue两种往复运动单支镍钛锉进行根管预备均可较好保持根管的原始形态,且均具备良好的中心定位能力,但Waveone Gold的预备时间更短。

Objective:To compare the preparation efficiency,the amount of apical debris and the root micro-cracks of the rotary nickel-titanium single-file reciprocating motion system,Waveone Gold and Reciproc Blue.Methods:60 extracted mandibular premolars with mature apical development were collected for the purpose of orthodontic tooth extraction.60 isolated teeth were divided into Waveone Gold(root canal preparation)group and Reciproc Blue(root canal preparation)group according to the different root canal preparation,with 30 teeth in each group.The preparation time,root canal curvature,amount of apical debris pushed out,occurrence of root microcracks and ability of central positioning were compared between the two groups.Results:The root canal preparation time of Waveone Gold group was shorter than that of Reciproc Blue group(P<0.05).After preparation,the root canal curvature of the two groups was slightly lower than that before preparation,but there was no statistically significant difference between the two groups before and after preparation(P>0.05).There was no significant difference between the two groups in the amount of apical debris ejection(P>0.05).5 and 3 teeth in the Waveone Gold group and the Reciproc Blue group had cracks,which were incomplete cracks.The incidence of root microcracks in the Reciproc Blue group was slightly lower than that in the Waveone Gold group,but there was no statistically significant difference between the two groups(P>0.05).There was no statistically significant difference in the axial center rate between the two groups at the measuring points 2,4 and 6 mm from the root tip(P>0.05).Conclusion:Waveone Gold and Reciproc Blue,two kinds of rotary nickel-titanium single-file reciprocating motion system for root canal preparation,can better maintain the original shape of the root canal,and both have good central positioning ability,but the preparation time of Waveone Gold is shorter.