新型机用不锈钢锉Gentlefile根管成形能力的体外研究  

Shaping Ability of New Stainless-steel Files in Simulated Canals:in Vitro Study

作　　者：陈细雄 葛久禹[1] CHEN Xixiong;GE Jiuyu(Department of Endodontics,Nanjing Stomatological Hospital,Medical School of Nanjing University,Nanjing 210023,China)

机构地区：[1]南京大学医学院附属口腔医院牙体牙髓科,江苏南京210023

出　　处：《口腔医学研究》2021年第8期722-726,共5页Journal of Oral Science Research

基　　金：国家临床重点专科建设项目[卫生部卫办医政函(2011)873号];江苏省自然科学基金面上项目(编号:BK2012522)。

摘　　要：目的:比较一种独特的机用不锈钢旋转系统———Gentlefile(GF)和Protaper(PT)在J形模拟根管中的成形能力。方法:将33个带有J形模拟根管的树脂块根据尖端直径分成3组,分别将其预备至GF Red(#23)、PT F2(#25)、GF Blue(#26)。使用牙科手术显微镜以及相关软件采集并处理预备前后图像。比较根管偏移量及中心比,同时记录根管台阶和器械分离情况。使用扫描电镜观察预备前后器械的表面变化。结果:本次实验共发生了2例GF器械分离。相比于PT F2,GF系统在根尖和根中段表现出更强的定心能力和更少的根管偏移。而GF Red和GF Blue间均无显著差异。扫描电镜结果显示预备后GF器械在根尖段发生不同程度地损坏,而PT器械未发现明显异常。结论:在本研究条件下,GF器械表现出更好的抗偏移能力,但也易发生器械磨损甚至分离,建议一次性使用。Objective:To compare the shaping ability of Gentlefile(GF),an unique stainless-steel(SS)rotary system,and Protaper(PT),a popular mechanical nickel-titanium(NiTi)system,in J-shaped simulated canals.Methods:Thirty-three resin blocks with a J-shaped canal were selected and randomly divided into 3 groups according to tip diameters:Group 1,GF red(#23);Group 2,PT F2(#25);and Group 3,GF blue(#26).Specimens were photographed and processed by dental operating microscope and software before and after preparation.The centering ability and canal transportation in different dimensions were calculated.Canal aberration and instrument separation were also recorded.The changes of the instruments were observed by scanning electron microscope.Results:Two cases of instrument separation of GF were noted.The GF system was significantly more centered and less transported than PT F2 in the apical and middle section.There was no difference between two GF instruments.Scanning electron microscope showed that GF instruments were damaged in apical segment,but PT instruments has similar surface morphology compared with the new file.Conclusion:GF showed better anti transportation ability.However,it is recommended to use the new file only once for its probability to be damaged.

关 键 词：Gentlefile PROTAPER 根管预备 根管成形 

分 类 号：R781.05[医药卫生—口腔医学]