Keith Aaron M, Hinman Susan E, Dickens Noel E, Kim Jeffrey J, Scott Rodney V, Osborne Nancy H
Endodontics Department, Naval Postgraduate Dental School, Naval Medical Leader and Professional Development Command and Postgraduate Dental College, Uniformed Services University of the Health Sciences, Bethesda, Maryland.
Endodontics Department, Naval Postgraduate Dental School, Naval Medical Leader and Professional Development Command and Postgraduate Dental College, Uniformed Services University of the Health Sciences, Bethesda, Maryland.
J Endod. 2024 Dec;50(12):1766-1771. doi: 10.1016/j.joen.2024.10.002. Epub 2024 Oct 10.
Currently there is no standardization of variable taper endodontic files and corresponding gutta-percha (GP) cones. The aim of this study was to evaluate intramanufacturer and intermanufacturer variability of diameter and taper in the apical third of GP master cones and finishing files from 3 commercially available variable taper endodontic systems.
Diameter measurements were recorded using digital microscopy at 1-mm increments (D1-D4) for F2 files and corresponding GP cones (n = 20 per system) from ProTaper Gold (Dentsply Tulsa Dental Specialties, Johnson City, TN), EdgeTaper Platinum (EdgeEndo, Albuquerque, NM), and ExactTaper H (SS White, Lakewood, NJ). Taper was defined as the rate of change in diameter per 1-mm increment. Mean differences in diameter were assessed using repeated measures of analysis of variance for D1 to D4 and the Wilks test for differences in taper.
In the apical third, ProTaper and EdgeEndo mean file diameters were significantly smaller than corresponding GP cone diameters (P < .01, P < .01, respectively). Contrastingly, SS White file diameters were significantly larger than their corresponding GP cones (P = .02). Files from all manufacturers had significantly smaller diameters than advertised (nominal) values (P < .01). ProTaper GP cones had similar diameters to nominal values (P = .30), while EdgeEndo and SS White GP cones were significantly smaller (P < .01). Amongst files and corresponding GP cones from all systems, taper was nonstandardized.
Size discrepancies between finishing files and corresponding GP cones can be expected amongst variable taper endodontic systems. Therefore, clinicians should be prepared to make intraoperative adjustments when obturating.
目前，可变锥度根管锉和相应的牙胶尖尚无标准化。本研究的目的是评估来自3种市售可变锥度根管系统的牙胶尖主尖和完成锉根尖三分之一处的直径和锥度在制造商内部和制造商之间的差异。
使用数字显微镜以1毫米增量（D1-D4）记录ProTaper Gold（登士柏 Tulsa 牙科专业公司，田纳西州约翰逊城）、EdgeTaper Platinum（EdgeEndo，新墨西哥州阿尔伯克基）和ExactTaper H（SS White，新泽西州莱克伍德）的F2锉和相应牙胶尖（每个系统n = 20）的直径测量值。锥度定义为每1毫米增量的直径变化率。使用重复测量方差分析评估D1至D4直径的平均差异，并使用威尔克斯检验评估锥度差异。
在根尖三分之一处，ProTaper和EdgeEndo锉的平均直径明显小于相应牙胶尖的直径（分别为P <.01，P <.01）。相反，SS White锉的直径明显大于其相应的牙胶尖（P =.02）。所有制造商的锉直径均明显小于标称值（P <.01）ProTaper牙胶尖的直径与标称值相似（P =.30），而EdgeEndo和SS White牙胶尖明显较小（P <.01）。在所有系统的锉和相应牙胶尖中，锥度未标准化。
在可变锥度根管系统中，完成锉和相应牙胶尖之间的尺寸差异是可以预期的。因此，临床医生在进行根管充填时应准备好进行术中调整。
