机用镍钛通畅锉用于S形根管成形能力的体外研究

Shaping Ability of Instrumental Nickel-titanium Endodontic Files in S-shaped Resin Simulated Root Canal

目的:比较R-Pilot(RP)、One G(OG)、ProGlider(Pr)、PathFile(Pa)、HyFlex EDM Glidepath File(EDM)以及手动不锈钢K锉(K锉)在S形树脂模拟根管制备通畅通道的成形能力。方法:48个S形树脂模拟根管,随机分为6组(n=8),分别使用6种器械制备通畅通道,记录制备时间;扫描仪获取制备前后根管图像,使用Photoshop和ImageJ软件进行图像重叠,并从根尖止点开始,每隔1 mm测量根管内、外侧壁树脂去除量;外弯量减去内弯量,表示中心定位能力。单因素方差分析进行统计学检验,显著水平为0.05。结果:制备时间方面,RP与OG最短,显著小于其他各组(P<0.05)。树脂去除量方面,根方弯曲段(距根尖0~3 mm),RP、OG、Pr、Pa均显著小于EDM和K锉(P<0.05);冠方弯曲段(距根尖4~6 mm),RP、OG、K锉均显著小于EDM(P<0.05),显著多于Pr和Pa(P<0.05)。中心定位能力方面,根方弯曲段,RP、OG显著优于其他组(P<0.05);冠方弯曲段,Pr、Pa组最佳(P<0.05),RP、OG、K锉次之(P<0.05)。结论:S形根管制备通畅通道宜选用.03~.04锥度镍钛通畅锉,制备时间短、顺应性好、形成中上段开敞。

Objective:To compare the shaping ability of R-Pilot(RP),One G(OG),ProGlider(Pr),PathFile(Pa),HyFlex EDM Glidepath File(EDM),and manual stainless steel K-file(K file)in S-shaped resin simulated root canal.Methods:A total of 48 S-shaped resin simulated root canal blocks were divided randomly into six groups(n=8).Each group was prepared with each instrument,respectively.Preparation time was recorded.Pre-and post-operative images were obtained using a scanner and superimposed using Photoshop.The material removal was measured using ImageJ from the inner and outer canal walls beginning from 0 mm at the end point of the root canal.Centering ability was determined,accordingly.The data were analyzed using the One-Way ANOVA at a significance level of P<0.05.Results:In the term of preparation time,RP and OG were significantly shorter than the others(P<0.05).In the term of the material removal of resin,at the apical curve(0-3 mm from the apical foramen),RP,OG,Pr,and Pa were significantly less than EDM and K file(P<0.05).At the coronal curve(4-6 mm from the apical foramen),RP,OG,and K file were significantly less than EDM(P<0.05),and were significantly more than Pr and Pa(P<0.05).As far as the centering ability was concerned,at the apical curve,RP and OG were the optimum(P<0.05).At the coronal curve,Pr and Pa were the optimum(P<0.05),followed by RP,OG,and K file(P<0.05).Conclusion:For glide path preparation of S-shaped root canal,the 03-04 tapered nickel-titanium files were suitable,which had shorter preparation time,better centering ability,and the flare of the canal.