Herrera Ángel, Azabal Magdalena, Jimenez-Octavio Jesús R, Del Real-Romero Juan C, López de Armentia Sara, Asensio-Gil Juan M, Arias Ana
Department of Conservative and Prosthetic Dentistry, School of Dentistry, Complutense University, 28040 Madrid, Spain.
Department of Dentistry, School of Medicine, San Pablo CEU University, 28003 Madrid, Spain.
Materials (Basel). 2024 Aug 10;17(16):3978. doi: 10.3390/ma17163978.
This study assessed the surface topography and plastic deformation (PD) of new and used contemporary reciprocating instruments. Twenty-six WaveOne Gold (WOG) and EdgeOne Fire (EO) instruments were photographed under magnification. The instruments were randomly assigned to a control group of new instruments preserved for surface roughness analysis (n = 6 each), or to an experimental group to shape the root canal system of a single molar (n = 20 each), making a total of four groups (WOGnew, EOnew, WOGused, EOused). Used instruments were also photographed after instrumentation. The presence of fractures was registered. Preoperative and postoperative images were randomly ordered for evaluation. Two blinded calibrated examiners evaluated the presence of PD. Inter-observer agreement was calculated with the Kappa coefficient (K = 0.89). 3D profilometry was also used for the surface roughness analysis of six randomly selected instruments from the WOGused and EOused groups. Chi-square and two-way ANOVA tests were used to, respectively, compare PD and changes in surface roughness among the groups. No instruments fractured; however, a significantly greater percentage of EO instruments suffered plastic deformation than WOG instruments ( < 0.001), (OR = 11.09 (CI 95% 2.6-56.3)). The overall surface roughness was higher for most parameters in the EO instruments ( < 0.05). Single uses of EO instruments produced significantly higher chances of PD and increased surface roughness values compared to WOG.
本研究评估了新型和使用过的当代往复式器械的表面形貌和塑性变形（PD）。对26支WaveOne Gold（WOG）和EdgeOne Fire（EO）器械进行放大拍照。将器械随机分为对照组，即保存用于表面粗糙度分析的新器械组（每组n = 6），或分为实验组，用于对单个磨牙的根管系统进行塑形（每组n = 20），共分为四组（WOG新器械组、EO新器械组、WOG使用过器械组、EO使用过器械组）。使用过的器械在器械操作后也进行拍照。记录有无折断情况。术前和术后图像随机排序进行评估。两名经过校准的盲法检查者评估塑性变形的存在情况。使用Kappa系数计算观察者间的一致性（K = 0.89）。还对从WOG使用过器械组和EO使用过器械组中随机选取的6支器械进行三维轮廓测量以分析表面粗糙度。分别使用卡方检验和双向方差分析来比较各组间的塑性变形和表面粗糙度变化。没有器械折断；然而，EO器械发生塑性变形的百分比显著高于WOG器械（< 0.001），（比值比 = 11.09（95%置信区间2.6 - 56.3））。EO器械大多数参数的总体表面粗糙度更高（< 0.05）。与WOG相比，EO器械单次使用产生塑性变形的可能性显著更高，且表面粗糙度值增加。
