Micro–computed Tomographic Evaluation of Dentinal Microcrack Formation after Using New Heat-treated Nickel-titanium Systems

Bayram, H. Melike; Bayram, Emre; Ocak, Mert; Uzuner, Muhammet Bora; Geneci, Ferhat; Çelik, Hakan

doi:10.1016/j.joen.2017.05.024

Cited by 37 publications

(62 citation statements)

References 20 publications

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Section: Discussionsupporting

confidence: 93%

“…This is in agreement with previous micro-CT investigations (5,15) and may be related to the higher resolution and magnification of micro-CT images compared with stereomicroscopy (7) which emphasises the importance of a reliable and non-destructive, three-dimensional technology for the analysis of microcrack formation (14). As these preexisting defects have been only observed under postextraction conditions (15,32,33) and dehydration of extracted teeth affects the biomechanical response of root dentine to instrumentation (34) or may induce spontaneous cracking of specimens (35), it was suggested that these defects should be referred to as experimental dentinal microcracks (31). As these preexisting defects have been only observed under postextraction conditions (15,32,33) and dehydration of extracted teeth affects the biomechanical response of root dentine to instrumentation (34) or may induce spontaneous cracking of specimens (35), it was suggested that these defects should be referred to as experimental dentinal microcracks (31).…”

Section: Discussionsupporting

confidence: 93%

“…This finding is in agreement with previous micro-CT studies that have shown no correlation between root canal instrumentation and the formation or propagation of dentinal microcracks (4,14,15). Neither instrumentation technique nor canal curvature had an influence on dentinal microcrack formation; thus, the null hypothesis was accepted.…”

Section: Discussionsupporting

confidence: 92%

“…This finding is in line with previous micro-CT studies demonstrating no influence of root canal preparation with single reciprocating and multiple file rotating NiTi systems on the formation of microcracks (4,15,28). This finding is in line with previous micro-CT studies demonstrating no influence of root canal preparation with single reciprocating and multiple file rotating NiTi systems on the formation of microcracks (4,15,28).…”

Section: Discussionsupporting

confidence: 91%

“…These conflicting findings reported in micro-CT studies can be due to different scanning resolutions and reconstruction parameters, incorrect interpretation of digital artefacts or differences in the number of cross-sectional images (15,17). However, the majority of current studies using micro-CT imaging concluded that root canal preparation did not induce dentinal microcracks (4,9,(14)(15)(16).…”

Section: Introductionmentioning

confidence: 97%

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Incidence of microcracks after preparation of straight and curved root canals with three different NiTi instrumentation techniques assessed by micro‐CT

et al. 2019

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All authors have contributed significantly and are in agreement with the manuscript. AbstractThis study evaluated the effect of three different NiTi instrumentation techniques on the incidence of microcracks after the preparation of straight and curved root canals using micro-CT. Roots from mandibular premolars and maxillary molars (n = 66) with the same mean canal curvatures were assigned to three groups of straight and three groups of curved roots (n = 11). After preoperative micro-CT scans, root canals were prepared with Reciproc, OneShape and ProTaper Next to size 25. Specimens were scanned again, and pre-and post-operative cross-sectional images (n = 75 263) were screened to identify the presence of dentinal microcracks. Overall, microcracks were detected in 2.97% (n = 2236) of the cross-sectional images. No new dentinal microcracks were observed after root canal instrumentation of straight and curved canals with the tested NiTi systems. Instrumentation with Reciproc, OneShape and ProTaper Next did not induce the formation of dentinal microcracks irrespective of canal curvature.

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