Fernández-Pazos Gema, Martín-Biedma Benjamín, Varela-Patiño Purificación, Ruíz-Piñón Manuel, Castelo-Baz Pablo
Department of Pathology and Dental Therapeutics II, Universidad de Santiago de Compostela, Galicia, Spain.
J Clin Exp Dent. 2018 Nov 1;10(11):e1091-e1095. doi: 10.4317/jced.54910. eCollection 2018 Nov.
The aim of this study was to evaluate the fracture and defects observed in ProTaper Next files discarded after a normal clinical use.
571 ProTaper Next rotary instruments were collected after clinical use from the clinic of endodontics over 12 months. The length of the files was measured using a digital caliper to determine any fracture, later all the files were evaluated under a stereomicroscope to observe defects such as unwinding, curving or fracture. The data obtained were analyzed using a chi-square and z test.
13.83% of the discarded files showed defects, the most frequent defect was fracture (7.53%). The highest rate of fracture was observed in the X1 (17.04) files (19.87%). The presence of deformations without fracture was also more frequent in the 17.04 file (11.8%).
Because of the relatively high incidence of deformation of smaller files, these instruments should be considered as a single use. It is important not to exceed the maximum uses recommended by the manufacturer to reduce the risk of cyclic fatigue, the main cause of fracture of the files (79.07%). It is also important to observe each file after use to discard small defects or fractures. Clinical use, deformation, fracture, M-Wire, ProTaper Next.
本研究的目的是评估在正常临床使用后废弃的ProTaper Next锉针中观察到的折断和缺陷情况。
在12个月的时间里，从牙髓病科收集了571支临床使用后的ProTaper Next旋转器械。使用数字卡尺测量锉针的长度以确定是否有折断，之后所有锉针均在体视显微镜下进行评估，以观察诸如松解、弯曲或折断等缺陷。对获得的数据进行卡方检验和z检验分析。
13.83%的废弃锉针显示有缺陷，最常见的缺陷是折断（7.53%）。在X1（17.04）锉针中观察到的折断率最高（19.87%）。在17.04锉针中，无折断的变形情况也更为常见（11.8%）。
由于较小锉针变形的发生率相对较高，这些器械应视为一次性使用。不超过制造商推荐的最大使用次数以降低循环疲劳风险很重要，循环疲劳是锉针折断的主要原因（79.07%）。使用后观察每支锉针以丢弃小的缺陷或折断情况也很重要。临床使用、变形、折断、M-Wire、ProTaper Next。
Zotero 插件
