Localizing the mandibular canal on dental CT reformatted images: usefulness of panoramic views

Takahashi, Akira; Watanabe, Hiroshi; Kamiyama, Yosuke; Honda, Eiichi; Sumi, Yasunori; Kurabayashi, Tohru

doi:10.1007/s00276-013-1120-6

Cited by 14 publications

(21 citation statements)

References 13 publications

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“…For this research, we used the images at Mark 2 (first molar region) for observation, which is the most common site of insertion for endosseous implants. 2,3 Each half mandible was fixed within a container (18 cm in diameter and 7 cm in height) with the mandibular plane parallel to the floor, ensuring it was in an upright position ( Figure 1). The containers were filled with water to simulate soft-tissue absorption and scatter radiation, and the height and width of the containers were larger than the FOV used.…”

Section: Samplesmentioning

confidence: 99%

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Effects of exposure parameters and slice thickness on detecting clear and unclear mandibular canals using cone beam CT

Jasa

Shimizu

Okamura

et al. 2017

Dentomaxillofacial Radiology

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Objectives: The purpose of this study was to clarify the effects of exposure parameters and image-processing methods when using CBCT to detect clear and unclear mandibular canals (MCs). Methods: 24 dry half mandibles were divided into 2 groups with clear and unclear MCs based on a previous CBCT study. Mandibles were scanned using a CBCT system with varying exposure parameters (tube voltages 60 kV, 70 kV and 90 kV; and tube currents 2 mA, 5 mA, 10 mA and 15 mA) to obtain a total of 144 scans. The images were processed with different slice thicknesses using ImageJ software (National Institutes of Health, Bethesda, MD). Five radiologists evaluated the cross-sectional images of the first molar region to detect the MCs. The diagnostic accuracy of varying exposure parameters and image-processing conditions was compared with the area under the curve (Az) in receiver-operating characteristic analysis. Results:The Az values for clear MCs were higher than those for unclear MCs (p , 0.0001). With increasing exposure voltages and currents, Az values increased, but no significant differences were found with high voltages and currents in clear MCs (p 5 1.0000 and p 5 0.9340). The Az values of serial images were higher than those of overlaid images (p , 0.0001), and those for thicker slices were higher than those for thinner slices (p , 0.0001). Conclusions: Our findings indicate that detection of unclear MCs requires either higher exposure parameters or processing of the images with thicker slices. To detect clear MCs, lower exposure parameters can be used.

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Section: Samplesmentioning

confidence: 99%

“…[1][2][3][4] When the mandibular molar region is the implant receptor site, it is important to accurately establish the location of the mandibular canals (MCs) to avoid vascular trauma or nerve damage. 5 Panoramic radiography is usually the first radiographic method used to evaluate the location of the MC.…”

Section: Introductionmentioning

confidence: 99%

Effects of exposure parameters and slice thickness on detecting clear and unclear mandibular canals using cone beam CT

Jasa

Shimizu

Okamura

et al. 2017

Dentomaxillofacial Radiology

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“…[4,10] In contrast with these results, the visibility of mandibular canal was significantly higher in panoramic views when reformatted from CT and compared with cross-sectional CT views. [15] This could be due to the high quality and minimum thickness of reformatted CT panoramic views when compared with conventional digital panoramic radiographs. [8] Although the depiction of mandibular canal is consistent and comparable between CT and CBCT, [6,7] CBCT is recommended and preferred over CT due to low radiation dose and high image resolution.…”

Section: Resultsmentioning

confidence: 99%

“…[22] Therefore, a drawback can be noticed in the previous studies which used CT images for visualizing of the mandibular canal before implant placement. [10,15] Moreover, rather than comparing the visibility of the canal on reformatted panoramic views with cross-sectional views, [15] it is necessary to identify the canal on both of the views, [9] since the canal has different locations on them.…”

Section: Resultsmentioning

confidence: 99%

The visibility of mandibular canal on orthoradial and oblique CBCT slices at molar implant sites

Alkhader

Hudieb

Jarab

et al. 2016

Biotechnology & Biotechnological Equipment

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The aim of the present study was to compare visibility of the mandibular canal on cone beam computed tomography (CBCT)-based orthoradial and oblique slices at molar implant sites. CBCT images for 132 mandibular molar implant sites were selected for the study. After generating orthoradial and oblique slices, two observers evaluated the visibility of the mandibular canal using three-point scoring scale (1À3, good to excellent). Wilcoxon signed-rank test compared the visibility scores of the two slices. Both orthoradial and oblique slices obtained from CBCT had only very good to excellent mandibular canal visibility scores. At 114 mandibular molar implant sites, the visibility score was equal on both orthoradial and oblique slices. Although the visibility score was higher on orthoradial slices for 12 implant sites, the visibility score was higher for six implant sites on oblique slices and the difference was not significant. Therefore, the visibility of the mandibular canal was excellent and comparable on most of orthoradial and oblique slices obtained from CBCT images.

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“…Oliveira‐Santos et al () reported that the mandibular canal was visualized in 62.9–87.9% of patients on their CBCT study. According to Takahashi et al (), up to 82% of mandibular canals can be detected using paraxial and panoramic views obtained from CBCT data and using the “Outlining the Mandibular Canal in the Panoramic View” software function. A study by Lofthag‐Hansen et al () showed that the mandibular canal was visualized in only 33% (10/30) of cases when using paraxial views; however, it was visible in 87% (26/30) when using a combination of paraxial, sagittal, and axial images.…”

Section: Introductionmentioning

confidence: 99%

Microsurgical Anatomy of the Superior Wall of the Mandibular Canal and Surrounding Structures: Suggestion for New Classifications for Dental Implantology

Iwanaga

Anand²,

Jain

et al. 2019

Clinical Anatomy

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Our goal was to clarify the relationship between the superior wall of the mandibular canal and the presence of teeth. We also sought to study the structural changes of the mandibular canal after tooth loss. Twenty sides from 10 dry mandibles derived from six males and four females were used for this study. The age of the specimens at the time of death ranged from 57 to 91 years. The mandibles were cut in the midline resulting in 20 hemi-mandibles. The presence of teeth (from the second premolar to the third molar) was recorded for each hemi-mandible. The mandibular canal in the body of the mandible was divided into four areas, that is, Areas 1-4. The superior wall of the mandibular canal and a cancellous bone pattern above the mandibular canal were observed. Next, the mandibular canal was horizontally cut at its center and the superior wall of the mandibular canal observed inferiorly. A total of 75 areas (20 dentulous areas and 55 edentulous areas) were produced. The distal view was classified into three groups, Type I (trabecular pattern), Type II (osteoporotic pattern), and Type III (dense/irregular pattern). The Type I pattern was found in 60.0%

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Localizing the mandibular canal on dental CT reformatted images: usefulness of panoramic views

Abstract: The detectability of the mandibular canal was significantly higher in panoramic views than in paraxial views. Using the function of "Outlining the Mandibular Canal in the Panoramic View", the precision for identifying the canal on paraxial views was considered to be improved.

Cited by 14 publications

References 13 publications

Effects of exposure parameters and slice thickness on detecting clear and unclear mandibular canals using cone beam CT

Effects of exposure parameters and slice thickness on detecting clear and unclear mandibular canals using cone beam CT

The visibility of mandibular canal on orthoradial and oblique CBCT slices at molar implant sites

Microsurgical Anatomy of the Superior Wall of the Mandibular Canal and Surrounding Structures: Suggestion for New Classifications for Dental Implantology

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