Moisture content of root canal dentine affects detection of microcracks using micro‐computed tomography

Rödig, Tina; Müller, Christine; Hoch, Monika; Haupt, Franziska; Schulz, Xenia; Wiegand, Annette; Rizk, Marta

doi:10.1111/iej.12850

Cited by 26 publications

(32 citation statements)

References 31 publications

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“…The topic remains controversial, especially as cracks can appear or disappear as a function of moisture content of the dentine due to swelling of the collagen (Rödig et al . ). Nevertheless, Atmeh & Watson () reported dentine distortion and crack propagation by examining tooth‐cutting interactions using video‐rate confocal microscopy and each intracanal mechanical manipulation seems to cause root surface strain (Pilo et al .…”

Section: Introductionmentioning

confidence: 97%

Real‐time dynamic torque values and axial forces during preparation of straight root canals using three different endodontic motors and hand preparation

2018

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Section: Introductionmentioning

confidence: 97%

Real‐time dynamic torque values and axial forces during preparation of straight root canals using three different endodontic motors and hand preparation

2018

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“…Moisture content of dentine can in uence the detection of micro-CT. So in this study, we performed dried condition to avoid the missing of some cracks (22). Also, in order to reduce the omission diagnostic rate of dentin cracks, we used micro-CT to detect tooth cracks which reached or exceeded the enamel-dentinal junction.…”

Section: Discussionmentioning

confidence: 99%

Evaluate four different ways in diagnosing tooth cracks

Feng

Jiang

et al. 2020

Preprint

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Introduction The aim of this study was to evaluate four different ways in diagnosing tooth cracks, which may provide certain theoretical bases for early diagnosis of cracks. Methods 123 freshly extracted human teeth were collected in the Stomatology Hospital of Guangzhou Medical University, Guangzhou, China. Three observers examined the cracks of the crowns with naked eye, microscope, methylene blue dye, and methylene blue dye with magnification microscopic examination methods independently. Two criteria (crack lines appeared in enamel and dentin) were used to diagnose teeth cracks, and statistical analysis was performed using the SPSS and MedCalc statistical software. Kendall's W was conducted to assess the agreement among the three observers in each detection method. Sensitivity, specificity, positive predictive value, negative predictive value, and the area under the curve (AUC) drawn in terms of sensitivity and (1-specificity) were calculated to evaluate the diagnostic value of four different methods. Results 3 teeth were excluded because of the visual fatigue of the observer, and there were 120 teeth left. The method of methylene blue plus microscope had the lowest value of Kendall's W in criterion 1 and 2. The overall AUC values were more than 0.7 in both the microscopic and methylene blue plus microscopic method according to criterion 1 and 2, and in the method of naked-eye according to criterion 2. The pairwise comparison between A, B and C had statistical difference in the method of naked-eye, microscope and methylene blue plus microscope in criterion 2 ( P < 0.05). Conclusions Detecting tooth crack with the method of methylene blue plus microscope have a higher consistency among different experienced endodontists. Microscope and methylene blue dye with magnification microscopic examination were effective methods to diagnosis tooth crack. More cracks can be detected by experienced endodontists, and the difference persisted even with the use of microscopes or methylene blue dye.

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“…In contrast, the length of microcracks significantly increased after the instrumentation of mandibular molars with a rotary single‐file system (OneShape) compared with reciprocating systems (Reciproc, WaveOne) . The use of different scan and reconstruction parameters, different micro‐CT resolutions or different moisture conditions of root dentin influencing the visibility of microcracks may have caused these conflicting findings.…”

Section: Discussionmentioning

confidence: 99%

“…This technique allows three‐dimensional, noninvasive assessment and visualisation of microcracks and facilitates pre‐ and post‐operative analysis of the same specimens which serve as their own control . In this study, specimens were scanned after 2 h dry time as it was demonstrated that the moisture condition of dentin influences the visibility of microcracks on micro‐CT images and scanning of wet samples may lead to false‐negative results and underestimation of dentinal crack formation .…”

Section: Discussionmentioning

confidence: 99%

“…Subsequently, cross‐sectional images from pre‐ and post‐operative scans ( n = 75 263) were evaluated by two calibrated observers for the presence of dentinal microcracks. Calibration of the examiners was performed by screening micro‐CT cross‐sectional images of five specimens with different moisture conditions of root canal dentin from a previous study in which reliable identification of dentinal defects with an inter‐rater percentage agreement of more than 80% was demonstrated . First, the post‐operative images were analysed, and the number of cross‐sections showing microcracks had been observed was recorded.…”

Section: Methodsmentioning

confidence: 99%

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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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Moisture content of root canal dentine affects detection of microcracks using micro‐computed tomography

Abstract: Moisture content of dentine influenced detection of microcracks when evaluated using micro-CT. Scanning should be performed on dried specimens to allow reliable identification of dentinal defects. Formation of new cracks during dry periods up to 24 h was disproved.

Cited by 26 publications

References 31 publications

Real‐time dynamic torque values and axial forces during preparation of straight root canals using three different endodontic motors and hand preparation

Real‐time dynamic torque values and axial forces during preparation of straight root canals using three different endodontic motors and hand preparation

Evaluate four different ways in diagnosing tooth cracks

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

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