Positional Differences of the Mandibular Canal in Relation to Permanent Mandibular First Molars with Eruption Disturbances in Children

Eruption disturbances in permanent mandibular first molars (PM1s) are uncommon. This retrospective study aimed to investigate differences in the position of the mandibular canal in relation to PM1s, with or without, eruption disturbances. Panoramic and cross-sectional views were reconstructed from cone-beam computed tomography imaging of children with PM1 eruption disturbances. Distances from the most inferior margin of the mandible to the center of the mandibular canal (M–C) and from the outer margin of the lingual cortex to the center of the mandibular canal (L–C) were measured for normally erupted PM1s (normal group) and for PM1s with eruption disturbances (ED group) and compared using independent t-tests. The mean M–C was significantly shorter in the ED group (4.86 ± 1.07 mm) than in the normal group (6.56 ± 1.06 mm) (p < 0.05). The mean L–C was also significantly shorter in the ED group (2.74 ± 0.74 mm) than in the normal group (3.09 ± 0.71 mm) (p < 0.05). This study demonstrated that the mandibular canal tended to be positioned more inferiorly in relation to PM1s with eruption disturbances than normally erupted PM1s in children. Clinicians should be aware of this positional deviation when managing children with PM1 eruption disturbances.

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Determining the Accuracy of the Mandibular Canal Region in 3D Biomodels Fabricated from CBCT Scanned Data: A Cadaveric Study

Current Medical Imaging Formerly Current Medical Imaging Reviews ◽

10.2174/1573405614666181012144745 ◽

2019 ◽

Vol 15 (7) ◽

pp. 645-653 ◽

Cited By ~ 1

Author(s):

Syed Yusoff Alzawawi Syed Abd Fattah ◽

Firdaus Hariri ◽

Phrabhakaran Nambiar ◽

Zulkiflee Abu Bakar ◽

Zainal Ariff Abdul Rahman

Keyword(s):

Computed Tomography ◽

Gold Standard ◽

Mandibular Canal ◽

Mean Value ◽

Cone Beam ◽

Cross Sectional ◽

Measurement Protocol ◽

Significant Difference ◽

The Mean ◽

Using Data

Objective:To validate the accuracy of the mandibular canal region in 3D biomodel produced by using data obtained from Cone-Beam Computed Tomography (CBCT) of cadaveric mandibles.Methods:Six hemi-mandible samples were scanned using the i-CAT CBCT system. The scanned data was transferred to the OsiriX software for measurement protocol and subsequently into Mimics software to fabricate customized cutting jigs and 3D biomodels based on rapid prototyping technology. The hemi-mandibles were segmented into 5 dentoalveolar blocks using the customized jigs. Digital calliper was used to measure six distances surrounding the mandibular canal on each section. The same distances were measured on the corresponding cross-sectional OsiriX images and the 3D biomodels of each dentoalveolar block.Results:Statistically no significant difference was found when measurements from OsiriX images and 3D biomodels were compared to the “gold standard” -direct digital calliper measurement of the cadaveric dentoalveolar blocks. Moreover, the mean value difference of the various measurements between the different study components was also minimal.Conclusion:Various distances surrounding the mandibular canal from 3D biomodels produced from the CBCT scanned data was similar to that of direct digital calliper measurements of the cadaveric specimens.

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Intraoperative cone beam computed tomography for detecting residual stones in percutaneous nephrolithotomy: a feasibility study

Urolithiasis ◽

10.1007/s00240-021-01259-1 ◽

2021 ◽

Author(s):

R. A. Kingma ◽

M. J. H. Voskamp ◽

B. H. J. Doornweerd ◽

I. J. de Jong ◽

S. Roemeling

Keyword(s):

Computed Tomography ◽

Percutaneous Nephrolithotomy ◽

Cone Beam Computed Tomography ◽

University Hospital ◽

Cone Beam ◽

Cross Sectional ◽

The Mean ◽

Residual Stones ◽

Residual Fragments

AbstractCone beam computed tomography (CBCT) provides multiplanar cross-sectional imaging and three-dimensional reconstructions and can be used intraoperatively in a hybrid operating room. In this study, we investigated the feasibility of using a CBCT-scanner for detecting residual stones during percutaneous nephrolithotomy (PCNL). Intraoperative CBCT-scans were made during PCNL procedures from November 2018 until March 2019 in a university hospital. At the point where the urologist would have otherwise ended the procedure, a CBCT-scan was made to image any residual fragments that could not be detected by either nephroscopy or conventional C-arm fluoroscopy. Residual fragments that were visualized on the CBCT-scan were attempted to be extracted additionally. To evaluate the effect of this additional extraction, each CBCT-scan was compared with a regular follow-up CT-scan that was made 4 weeks postoperatively. A total of 19 procedures were analyzed in this study. The mean duration of performing the CBCT-scan, including preparation and interpretation, was 8 min. Additional stone extraction, if applicable, had a mean duration of 11 min. The mean effective dose per CBCT-scan was 7.25 mSv. Additional extraction of residual fragments as imaged on the CBCT-scan occurred in nine procedures (47%). Of the follow-up CT-scans, 63% showed a stone-free status as compared to 47% of the intraoperative CBCT-scans. We conclude that the use of CBCT for the detection of residual stones in PCNL is meaningful, safe, and feasible.

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Patient dose from kilovoltage cone beam computed tomography imaging in radiation therapy

Medical Physics ◽

10.1118/1.2198169 ◽

2006 ◽

Vol 33 (6Part1) ◽

pp. 1573-1582 ◽

Cited By ~ 241

Author(s):

Mohammad K. Islam ◽

Thomas G. Purdie ◽

Bernhard D. Norrlinger ◽

Hamideh Alasti ◽

Douglas J. Moseley ◽

...

Keyword(s):

Computed Tomography ◽

Radiation Therapy ◽

Cone Beam Computed Tomography ◽

Patient Dose ◽

Cone Beam ◽

Computed Tomography Imaging ◽

Tomography Imaging

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Pre-surgical evaluation of mandibular third molars using computed tomography imaging and cone beam volumetric tomography imaging

British Journal of Oral and Maxillofacial Surgery ◽

10.1016/j.bjoms.2007.07.137 ◽

2007 ◽

Vol 45 (7) ◽

pp. e11

Author(s):

Michael W. Mahoney ◽

Paul Monsour

Keyword(s):

Computed Tomography ◽

Cone Beam ◽

Third Molars ◽

Computed Tomography Imaging ◽

Tomography Imaging ◽

Surgical Evaluation ◽

Mandibular Third Molars

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Evaluation of the Relationship between Mandibular Third Molar and Mandibular Canal by Different Algorithms of Cone-beam Computed Tomography

The Journal of Contemporary Dental Practice ◽

10.5005/jp-journals-10024-1609 ◽

2014 ◽

Vol 15 (6) ◽

pp. 740-745

Author(s):

Mojdeh Mehdizadeh ◽

Navid Ahmadi ◽

Mahsa Jamshidi

Keyword(s):

Computed Tomography ◽

Cone Beam Computed Tomography ◽

Inferior Alveolar Nerve ◽

Third Molar ◽

Mandibular Canal ◽

Cross Sectional Study ◽

Cone Beam ◽

Cross Sectional ◽

Mandibular Third Molar ◽

The Relationship

ABSTRACT Objectives Exact location of the inferior alveolar nerve (IAN) bundle is very important. The aim of this study is to evaluate the relationship between the mandibular third molar and the mandibular canal by cone-beam computed tomography. Study design This was a cross-sectional study with convenience sampling. 94 mandibular CBCTs performed with CSANEX 3D machine (Soredex, Finland) and 3D system chosen. Vertical and horizontal relationship between the mandibular canal and the third molar depicted by 3D, panoramic reformat view of CBCT and cross-sectional view. Cross-sectional view was our gold standard and other view evaluated by it. Results There were significant differences between the vertical and horizontal relation of nerve and tooth in all views (p < 0.001). Conclusion The results showed differences in the position of the inferior alveolar nerve with different views of CBCT, so CBCT images are not quite reliable and have possibility of error. How to cite this article Mehdizadeh M, Ahmadi N, Jamshidi M. Evaluation of the Relationship between Mandibular Third Molar and Mandibular Canal by Different Algorithms of Cone-beam Computed Tomography. J Contemp Dent Pract 2014;15(6):740-745.

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