title: Evaluation of microcrack formation in root canals after instrumentation with different NiTi rotary file systems: a scanning electron microscopy study.
abstract: The aim of this study was to evaluate the dentinal microcrack formation of ProTaper Universal, ProTaper Next, and WaveOne. Sixty extracted mandibular molars were selected. The mesial roots were resected and randomly divided into four groups (n = 15). The canals were prepared with hand files (group 1), ProTaper Universal (group 2), ProTaper Next (group 3), and WaveOne (group 4) instrument systems. The roots were separated horizontally at 3, 6, and 9 mm from the apex. Digital images were captured at ×40 magnification using scanning electron microscopy to detect microcrack formation. Statistical analysis was performed by Pearson Chi-square test. The prevalence of microcracks in group 2, group 3, and group 4 were significantly higher when compared to group 1 (p < 0.001). Group 2, group 3, and group 4 demonstrated similar prevalence of microcracks without significant difference (p > 0.05) in all sections. All instruments caused microcracks except for hand file. The highest percentage of microcrack was recorded in 3 mm section for all groups.
authors.affiliation: Bülent Ecevit University, Faculty of Dentistry, Depertmant of Endodontics, Turkey.
authors.forename: Ersan
authors.initials: E
authors.lastname: Çiçek
authors.forename: Mustafa Murat
authors.initials: MM
authors.lastname: Koçak
authors.forename: Baran Can
authors.initials: BC
authors.lastname: Sağlam
authors.forename: Sibel
authors.initials: S
authors.lastname: Koçak
mesh_terms: D003786:Dental Pulp Cavity / Q000473:pathology*; D006801:Humans; D008855:Microscopy, Electron, Scanning / Q000379:methods; D018915:Root Canal Preparation / Q000009:adverse effects* / Q000379:methods*
keywords: Instrumentation; NiTi File; microcrack; root dentin; scanning electron microscope