An Application Framework of Three-dimensional Reconstruction and Measurement for Endodontic Research

Gao, Yuan; Peters, Ove A.; Wu, Hongkun; Zhou, Xuedong

doi:10.1016/j.joen.2008.11.011

Cited by 57 publications

(43 citation statements)

References 35 publications

(25 reference statements)

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“…The volumes of the root hard tissue and root canal were calculated starting from the cementoenamel junction up to the apex pre-and postoperatively. Geometry quantification was performed in MeVisLab using the framework described by Gao et al (25). The root canal diameter (thickness) was measured and color coded, and then the root hard tissue thickness measurement (starting from the cementoenamel junction up to the apex) was expressed as a color-coded map showing the calculated minimal distances from the canal surface to the external root surface (25).…”

Section: D Reconstruction and Quantitative Visualization Of Hard Tismentioning

confidence: 99%

3-dimensional Analysis of Regenerative Endodontic Treatment Outcome

EzEldeen

Gorp

Dessel

et al. 2015

Journal of Endodontics

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Introduction: A growing body of evidence supports the regeneration potential of dental tissues after regenerative endodontic treatment (RET). Nevertheless, a standard method for the evaluation of RET outcome is lacking. The aim of this study was to develop a standardized quantitative method for RET outcome analysis based on cone-beam computed tomographic (CBCT) volumetric measurements. Methods: Five human teeth embedded in mandibular bone samples were scanned using both an Accuitomo 170 CBCT machine (Morita, Kyoto, Japan) and a SkyScan 1174 micro-computed tomographic (mCT) system (SkyScan, Antwerp, Belgium). For subsequent clinical application, clinical data and low-dose CBCT scans (preoperatively and follow-up) from 5 immature permanent teeth treated with RET were retrieved. In vitro and clinical 3-dimensional image data sets were imported into a dedicated software tool. Two segmentation steps were applied to extract the teeth of interest from the surrounding tissue (livewire) and to separate tooth hard tissue and root canal space (level set methods). In vitro and clinical volumetric measurements were assessed separately for differences using Wilcoxon matched pairs test. Pearson correlation analysis and Bland-Altman plots were used to evaluate the relation and agreement between the segmented CBCT and mCT volumes. Results: The results showed no statistical differences and strong agreement between CBCT and mCT volumetric measurements. Volumetric comparison of the root hard tissue showed significant hard tissue formation. (The mean volume of newly formed hard tissue was 27.9 [AE10.5] mm 3 [P < .05]). Conclusions: Analysis of 3-dimensional data for teeth treated with RET offers valuable insights into the treatment outcome and patterns of hard tissue formation. (J Endod 2015;-:1-8)

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Section: D Reconstruction and Quantitative Visualization Of Hard Tismentioning

confidence: 99%

3-dimensional Analysis of Regenerative Endodontic Treatment Outcome

EzEldeen

Gorp

Dessel

et al. 2015

Journal of Endodontics

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“…Methods using global thresholds provide more or less successful results: a grey value is chosen as the threshold to separate the object from the background. This technique is easy and quick to apply 21,22 but depends on the amount of noise, the contrast between structures and partial volume effects. A threshold value could be optimal for a certain part of the object but not for the whole.…”

Section: Discussionmentioning

confidence: 99%

“…3,9,10 MeVisLab is a software package for medical images, providing a modular visual programming interface with a comprehensive suite of image processing and visualization tools. 21 An interest of our study was to use the gradient grey value for detection of the root canal outline, which represents the amount of difference between grey values of two neighbouring voxels. It deals with the difference and could be less dependent on grey value variations, which can be found according to the patients or the parameters of acquisition.…”

Section: Discussionmentioning

confidence: 99%

Influence of CBCT parameters on the output of an automatic edge-detection-based endodontic segmentation

Michetti¹,

Georgelin-Gurgel²,

Mallet³

et al. 2015

Dentomaxillofacial Radiology

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Objectives: To determine the optimal CBCT settings for an automatic edge-detection-based endodontic segmentation procedure by assessing the accuracy of the root canal measurements. Methods: 12 intact teeth with closed apexes were cut perpendicular to the root axis, at predetermined levels to the reference plane (the first section made before acquisition). Acquisitions of each specimen were performed with Kodak 9000 ® 3D (76 mm, 14 bits; Kodak Carestream Health, Trophy, France) by using different combinations of milliamperes and kilovolts. Three-dimensional images were displayed and root canals were segmented with the MeVisLab software (edge-detection-based method; MeVis Research, Bremen, Germany). Histological root canal sections were then digitized with a 0.5-to 1.0-mm resolution and compared with equivalent two-dimensional cone-beam reconstructions for each pair of settings using the Pearson correlation coefficient, regression analysis and Bland-Altman method for the canal area and Feret's diameter. After a ranking process, a Wilcoxon paired test was carried out to compare the pair of settings. Results: The best pair of acquisition settings was 3.2 mA/60 kV. Significant differences were found between 3.2 mA/60 kV and other settings (p , 0.05) for the root canal area and for Feret's diameter. Conclusions: The quantitative analyses of the root canal system with the edge-detectionbased method could depend on acquisition parameters. Improvements in segmentation still need to be carried out to ensure the quality of the reconstructions when we have to deal with closer outlines and because of the low spatial resolution. Dentomaxillofacial Radiology (2015Radiology ( ) 44, 20140413. doi: 10.1259 Cite this article as: Michetti J, Georgelin-Gurgel M, Mallet J-P, Diemer F, Boulanouar K. Influence of CBCT parameters on the output of an automatic edge-detection-based endodontic segmentation. Dentomaxillofac Radiol 2015; 44: 20140413.

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“…The use of high-resolution computed tomography (micro-CT) to study root canal anatomy is a promising tool, but there are few difficulties that need to be overcome concerning the structure of tomographic experiments and the reconstruction and analysis of the 3D data configuration obtained. 12,[17][18][19] Furthermore, micro-CT scans can only detect the inorganic aspects of accumulated debris and not the organic counterparts. 20,21 In the present study, the setup combined with digital images and use of computer software enabled precise evaluation of even minor changes in the canal geometry.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Root Canal Cleaning and Shaping Efficacy of Three Engine-driven Instruments: SafeSider, ProTaper Universal and Lightspeed LSX

Wigler

Koren

Tsesis

2015

The Journal of Contemporary Dental Practice

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Aim:To compare the cleaning effectiveness and shaping ability of SafeSider, ProTaper Universal and Lightspeed rotary instruments during the preparation of curved root canals in extracted human teeth. Materials and methods:A total of 63 roots with curved root canals were divided into three groups. Canals were prepared using SafeSider, ProTaper Universal or Lightspeed LSX. Using pre-and post-instrumentation radiographs, straightening of the canal curvatures and loss of working length were determined with a computer image analysis program.The amounts of debris at the apical 5 mm were quantified on the basis of a numerical evaluation scale. The data were analyzed statistically using the two-way analysis of variance (ANOVA). Results:There was significantly more transportation among the Lightspeed LSX group compared to the SafeSider and ProTaper Universal groups only at the 4 mm level (p < 0.05). The ProTaper Universal instruments performed significantly faster than other groups. No significant differences were observed between the three engine-driven instruments with regards to debris removal. Conclusion:SafeSider, ProTaper Universal and Lightspeed LSX rotary instruments maintained the original canal curvature well at the apical 3 mm and were safe to use. No difference was found in cleaning efficacy and none rendered the apical part of the canal free of debris.Clinical significance: SafeSider, ProTaper Universal and Lightspeed LSX rotary instruments are safe to use in curved root canals.

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An Application Framework of Three-dimensional Reconstruction and Measurement for Endodontic Research

Cited by 57 publications

References 35 publications

3-dimensional Analysis of Regenerative Endodontic Treatment Outcome

3-dimensional Analysis of Regenerative Endodontic Treatment Outcome

Influence of CBCT parameters on the output of an automatic edge-detection-based endodontic segmentation

Evaluation of Root Canal Cleaning and Shaping Efficacy of Three Engine-driven Instruments: SafeSider, ProTaper Universal and Lightspeed LSX

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