Influence of voxel size on dentinal microcrack detection by micro-CT after root canal preparation

Pinto, Jáder Camilo; Coaguila‐Llerena, Hernán; Torres, Fernanda Ferrari Esteves; Lucas-Oliveira, Éverton; Bonagamba, Tito J.; Guerreiro-Tanomaru, Juliane Maria; Tanomaru‐Filho, Mário

doi:10.1590/1807-3107bor-2021.vol35.0074

Cited by 2 publications

(3 citation statements)

References 39 publications

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“…Previous study has reported no influence of voxel size on debris evaluation when analyses was performed between 5 and 20µm voxel size (25). However, other investigation, assessing the influence of voxel size on microcracks analyses showed higher accuracy for images with lower voxel size (26). Therefore, in agreement with the current literature, our results report that the influence of voxel size on analyses of root canal preparations using micro-CT is variable-dependent.…”

Section: Discussionsupporting

confidence: 91%

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Effect of Voxel Size of Micro-CT on the Assessment of Root Canal Preparation

Pinto

Lucas-Oliveira

Bonagamba

et al. 2023

Odovtos - Int J Dent Sc

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The aim of this study was to assess the influence of micro-computed tomography (micro-CT) voxel size on evaluation of root canal preparation using rotary heat-treated nickel-titanium files. Curved mesial root canals of mandibular molars were prepared using ProDesign Logic 30/.05 (PDL) or HyFlex EDM 25/.08 (HEDM) (n=12). The specimens were scanned using micro-CT with 5μm of voxel size before and after root canal preparation. Images with sub-resolution of 10 and 20μm voxel sizes were obtained. The percentage of volume increase, debris and uninstrumented root canal surface were analyzed in the different voxel sizes. Data were compared using unpaired Student’s t-test and ANOVA statistical tests (α=0.05). No differences were observed for percentage of volume increase, debris and instrumented surface between the root canals prepared by PDL and HEDM (p>0.05). Both systems promoted higher percentage of debris in the apical third compared to the middle third (p<0.05). After instrumentation using PDL the percentage of uninstrumented surface was highr in the apical third than middle third only when analysis were performed at 5µm (p<0.05). When comparing the different voxel sizes (5,10 or 20µm), both groups showed different means for the variables, with no significant difference (p>0.05). PDL and HEDM had similar root canal preparation capacity. Micro-CT images using different voxel sizes did not influence the results of volume increase and debris evaluation. However, images at 5µm showed greater accuracy to evaluate the percentage of uninstrumented surfaces.

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Section: Discussionsupporting

confidence: 91%

“…Images at 5,10 and 20μm were used for quantitative analysis (Figure 1). For this purpose, the previously scanned 5μm images were resized by 2 and 4, respectively using the CTAn software (24,25,26).…”

Section: Micro-ct Analysismentioning

confidence: 99%

Effect of Voxel Size of Micro-CT on the Assessment of Root Canal Preparation

Pinto

Lucas-Oliveira

Bonagamba

et al. 2023

Odovtos - Int J Dent Sc

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“…Microcracks were defined as lines or defects extending from inside the root canal to the dentin or from the outer root surface into the dentin. The distribution of microcracks was expressed as a percentage of the total cross-sectional images 18 . The qualitative analyses of microcracks were based on their length and width.…”

Section: Methodsmentioning

confidence: 99%

Effect of foraminal enlargement on microcrack formation and apical transportation: a nano-CT assessment

Pinto

Vasconcelos

Leite

et al. 2023

Sci Rep

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The aim of this study was to evaluate the foraminal enlargement and its influence on microcrack formation and apical transportation in root canals with apical curvature. Eighteen maxillary lateral incisors with apical curvature were selected by using micro-CT images. Root canals were randomly divided in two groups (n = 9) according to root canal preparation using two working lengths: 1 mm short of the apical foramen (control group) and 1 mm beyond the apical foramen (foraminal enlargement). For both groups Reciproc Blue R40 was used for root canal instrumentation. Specimens were scanned by nano-CT (UniTOM HR) before and after root canal preparation. Percentage, length, and width of microcracks, and apical transportation were assessed. Kappa, chi‐square and McNemar tests were used for qualitative analyses while paired and unpaired t-test were used for quantitative analyses (α = 0.05). For both groups, rather similar and low percentages of microcracks were observed before root canal preparation (P > 0.05). The foraminal enlargement promoted new microcracks, not observed in the control group. An increase in microcrack length was observed when the foraminal enlargement was performed (P < 0.05). Higher apical transportation was observed when foraminal enlargement was performed (P < 0.05). Foraminal enlargement using a heat-treated reciprocating file size 40 promoted microcracks and higher apical transportation than root canal preparation up to 1 mm short of apical foramen.

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Influence of voxel size on dentinal microcrack detection by micro-CT after root canal preparation

Cited by 2 publications

References 39 publications

Effect of Voxel Size of Micro-CT on the Assessment of Root Canal Preparation

Effect of Voxel Size of Micro-CT on the Assessment of Root Canal Preparation

Effect of foraminal enlargement on microcrack formation and apical transportation: a nano-CT assessment

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