使用自调式锉、Reciproc Blue和ProTaper Next进行根管预备时牙本质微裂纹的发生率。

Incidence of Dentinal Microcracks during Root Canal Preparation with Self Adjusting File, Reciproc Blue and ProTaper Next.

作者信息

Katanec Tomislav, Miletić Ivana, Baršić Gorana, Kqiku-Biblekaj Lumnije, Žižak Mirza, Jukić Krmek Silvana

机构信息

School of Dental Medicine, University of Zagreb, Gundulićeva 5, Zagreb, Croatia.

Department of Endodontics and Restorative Dentistry, University of Zagreb, Gundulićeva 5, Zagreb, Croatia.

出版信息

Iran Endod J. 2020 Winter;15(1):6-11. doi: 10.22037/iej.v15i1.26667.

DOI:10.22037/iej.v15i1.26667

PMID:36704321

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9723216/

Abstract

INTRODUCTION

Forces formed during root canal instrumentation could cause the crack formation in dentinal walls. Their propagation may result in vertical root fracture and eventually tooth loss. The aim of the study was to explore microcrack formation after root canal preparation with Self-adjusting File (SAF), Reciproc Blue (RB), and ProTaper Next (PTN) instruments on young premolars by means of micro-computed tomography (micro CT).

METHODS AND MATERIALS

Forty-five upper premolars with two canals, were extracted due to orthodontic reasons from patients aged 16 to 20 years and stored for up to two months. The teeth were scanned with a micro-CT (Nikon XT H 225, Tring, UK) at structural resolution of 20.2 µm and randomly divided into three groups: SAF, RB, and PTN. Specimens were instrumented and irrigation was performed with 12 mL of 2.5% sodium hypochlorite (NaOCl) and 4 mL of 17% ethylenediaminetetraacetic acid (EDTA) per root canal. Subsequently, the specimens were scanned under the same conditions as before, in wet condition and 24 h after drying. The presence of microcracks in dentinal walls was evaluated using the image-processing software Volume Graphics VGStudio Max 3.

RESULTS

No dentinal defect was found in any evaluated specimen, neither in pre-nor post-operative scans in wet and dry condition.

CONCLUSION

Under the circumstances of this study instruments with improved design and metallurgy do not cause dentinal microcracks in young premolar teeth.

摘要

引言

根管预备过程中形成的力可能导致牙本质壁出现裂纹。裂纹的扩展可能导致牙根纵裂，最终导致牙齿脱落。本研究的目的是通过显微计算机断层扫描（显微CT），探讨使用自调式锉（SAF）、Reciproc Blue（RB）和ProTaper Next（PTN）器械对年轻前磨牙进行根管预备后微裂纹的形成情况。

方法和材料

因正畸原因从16至20岁患者口中拔除45颗有两个根管的上颌前磨牙，并保存长达两个月。使用显微CT（尼康XT H 225，英国特林）以20.2 µm的结构分辨率对牙齿进行扫描，并随机分为三组：SAF组、RB组和PTN组。对标本进行预备，并每根根管使用12 mL 2.5%次氯酸钠（NaOCl）和4 mL 17%乙二胺四乙酸（EDTA）进行冲洗。随后，在相同条件下对标本进行扫描，分别为湿润状态和干燥24小时后。使用图像处理软件Volume Graphics VGStudio Max 3评估牙本质壁中微裂纹的存在情况。