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Central odontogenic fibroma: a case report.

Imaging Science in Dentistry.2011;41(2):85-88. doi:10.5624/isd.2011.41.2.85

Central odontogenic fibroma is a rare odontogenic neoplasm that originates from odontogenic ectomesenchyme. Here, a case of central odontogenic fibroma in a 17-year-old male is reported. Since the present case showed a multilocular radiolucency with partially ill-defined border between the right mandibular condyle and the distal root of the right mandibular third molar, differential diagnosis involved a wide range of pathosis from benign lesions like ameoloblastic fibroma and odontogenic myxoma to more aggressive lesions such as desmoplastic fibroma, juvenile aggressive fibromatosis, or fibrosarcoma.
Adolescent ; Diagnosis, Differential ; Fibroma ; Fibroma, Desmoplastic ; Fibromatosis, Aggressive ; Fibrosarcoma ; Humans ; Male ; Mandibular Condyle ; Molar, Third ; Myxoma ; Odontogenic Tumors

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Determination of midsagittal plane for evaluation of facial asymmetry using three-dimensional computed tomography.

Tae Young KIM ; Jee Seon BAIK ; Joo Young PARK ; Hwa Sung CHAE ; Kyung Hoe HUH ; Soon Chul CHOI

Imaging Science in Dentistry.2011;41(2):79-84. doi:10.5624/isd.2011.41.2.79

PURPOSE: The aim of the present study was to investigate the disagreement of cephalometric analysis depending on the reference determination of midsagittal plane on three-dimensional computed tomography. MATERIALS AND METHODS: A total of 102 young women with class III dentofacial deformity were evaluated using three-dimensional computed tomography. The cranial and facial midsagittal planes were defined and the amounts of jaw deviation were calculated. The amounts of jaw deviation were compared with paired t-test (2-tailed) and Bland-Altman plot was drawn. RESULTS: The landmark tracing were reproducible (r> or =.978). The jaws relative to the cranial midsagittal plane were 10-17 times more significantly deviated than to the facial midsagittal plane (P<.001). Bland-Altman plot demonstrated that the differences between the amounts of jaw deviation from two midsagittal planes were not normally distributed versus the average of the amounts of jaw deviation from two midsagittal planes. CONCLUSION: The cephalometric analyses of facial asymmetry were significantly inconsistent depending on the reference determination of midsagittal plane. The reference for midsagittal plane should be carefully determined in three-dimensional cephalometric analysis of facial asymmetry of patients with class III dentofacial deformity.
Cephalometry ; Dentofacial Deformities ; Facial Asymmetry ; Female ; Humans ; Jaw ; Tomography, X-Ray Computed

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Fractal analysis of mandibular trabecular bone: optimal tile sizes for the tile counting method.

Kyung Hoe HUH ; Jee Seon BAIK ; Won Jin YI ; Min Suk HEO ; Sam Sun LEE ; Soon Chul CHOI ; Sun Bok LEE ; Seung Pyo LEE

Imaging Science in Dentistry.2011;41(2):71-78. doi:10.5624/isd.2011.41.2.71

PURPOSE: This study was performed to determine the optimal tile size for the fractal dimension of the mandibular trabecular bone using a tile counting method. MATERIALS AND METHODS: Digital intraoral radiographic images were obtained at the mandibular angle, molar, premolar, and incisor regions of 29 human dry mandibles. After preprocessing, the parameters representing morphometric characteristics of the trabecular bone were calculated. The fractal dimensions of the processed images were analyzed in various tile sizes by the tile counting method. RESULTS: The optimal range of tile size was 0.132 mm to 0.396 mm for the fractal dimension using the tile counting method. The sizes were closely related to the morphometric parameters. CONCLUSION: The fractal dimension of mandibular trabecular bone, as calculated with the tile counting method, can be best characterized with a range of tile sizes from 0.132 to 0.396 mm.
Bicuspid ; Fractals ; Humans ; Incisor ; Mandible ; Molar ; Trabecular Meshwork

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Quantitative localization of impacted mesiodens using panoramic and periapical radiographs.

Hang Moon CHOI ; Jin Woo HAN ; In Woo PARK ; Jee Seon BAIK ; Hyun Woo SEO ; Joo Hyun LEE ; Ho Won PARK

Imaging Science in Dentistry.2011;41(2):63-69. doi:10.5624/isd.2011.41.2.63

PURPOSE: The purpose of this study was to evaluate a new technique for localizing impacted mesiodens using its horizontal magnification ratio on panoramic radiographs. MATERIALS AND METHODS: Location-magnification equation of a panoramic equipment was obtained from horizontal magnification ratio of a metal ball which was located variable positions from the center of image layer at interval of 2 mm. Panoramic radiographs were obtained from a skull phantom with a metal ball which was a substitute for impacted mesiodens and was embedded 10mm(Group 1), 15mm(Group 2), and 20mm(Group 3) posterior to the central incisor. Each group obtained 7 panoramic radiographs at variable positions and one periapical radiograph. Three methods were used to estimate the actual width of the incisors and the balls which were used to calculate the magnification ratio. The methods included using the actual incisor width and the calculated ball width (Method 1), using the actual incisor width and the ball widths measured on periapical radiograph (Method 2), and using the incisor and the ball widths measured on periapical radiograph (Method 3). The location of the metal ball was calculated by using the location-magnification equation. RESULTS: The smallest difference between the calculated and the actual distance was 0.1+/-0.7 mm in Group 1/Method 3. The largest difference was -4.2+/-1.6 mm in Group 3/Method 2. In all groups, method 3 was the most accurate. CONCLUSION: Quantitative localization of impacted mesiodens is possible by using panoramic radiograph.
Incisor ; Radiography, Dental ; Radiography, Panoramic ; Skull ; Tooth, Supernumerary

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Assessment of the increased calcification of the jaw bone with CT-Scan after dental implant placement.

Barunawaty YUNUS

Imaging Science in Dentistry.2011;41(2):59-62. doi:10.5624/isd.2011.41.2.59

PURPOSE: This study was performed to evaluate the changes of jaw bone density around the dental implant after placement using computed tomography scan (CT-Scan). MATERIALS AND METHODS: This retrospective study consisted of 30 patients who had lost 1 posterior tooth in maxilla or mandible and installed dental implant. The patients took CT-Scan before and after implant placement. Hounsfield Unit (HU) was measured around the implants and evaluated the difference of HU before and after implant installation. RESULTS: The mean HU of jaw bone was 542.436 HU and 764.9 HU before and after implant placement, respectively (p<0.05). The means HUs for male were 632.3 HU and 932.2 HU and those for female 478.2 HU and 645.5 HU before and after implant placement, respectively (p<0.05). Also, the jaw bone with lower density needed longer period for implant procedure and the increased change of HU of jaw bone was less in the cases which needed longer period for osseointegration. CONCLUSION: CT-Scan could be used to assess the change of bone density around dental implants. Bone density around dental implant was increased after placement. The increased rate of bone density could be determined by the quality of jaw bone before implant placement.
Bone Density ; Dental Implants ; Female ; Humans ; Jaw ; Male ; Mandible ; Maxilla ; Retrospective Studies ; Tomography, X-Ray Computed ; Tooth

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Diagnostic performance of dental students in identifying mandibular condyle fractures by panoramic radiography and the usefulness of reference images.

Bong Hae CHO

Imaging Science in Dentistry.2011;41(2):53-57. doi:10.5624/isd.2011.41.2.53

PURPOSE: The purpose of this study was to evaluate the diagnostic performance of dental students in detection of mandibular condyle fractures and the effectiveness of reference panoramic images. MATERIALS AND METHODS: Forty-six undergraduates evaluated 25 panoramic radiographs for condylar fractures and the data were analyzed through receiver operating characteristic (ROC) analysis. After a month, they were divided into two homogeneous groups based on the first results and re-evaluated the images with (group A) or without (group B) reference images. Eight reference images included indications showing either typical condylar fractures or anatomic structures which could be confused with fractures. Paired t-test was used for statistical analysis of the difference between the first and the second evaluations for each group, and student's t-test was used between the two groups in the second evaluation. The intra- and inter-observer agreements were evaluated with Kappa statistics. RESULTS: Intra- and inter-observer agreements were substantial (k=0.66) and moderate (k=0.53), respectively. The area under the ROC curve (Az) in the first evaluation was 0.802. In the second evaluation, it was increased to 0.823 for group A and 0.814 for group B. The difference between the first and second evaluations for group A was statistically significant (p<0.05), however there was no statistically significant difference between the two groups in the second evaluation. CONCLUSION: Providing reference images to less experienced clinicians would be a good way to improve the diagnostic ability in detecting condylar fracture.
Humans ; Mandibular Condyle ; Mandibular Fractures ; Radiography, Panoramic ; ROC Curve ; Students, Dental

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Current status of dental caries diagnosis using cone beam computed tomography.

Young Seok PARK ; Jin Soo AHN ; Ho Beom KWON ; Seung Pyo LEE

Imaging Science in Dentistry.2011;41(2):43-51. doi:10.5624/isd.2011.41.2.43

PURPOSE: The purpose of this article is to review the current status of dental caries diagnosis using cone beam computed tomography (CBCT). MATERIALS AND METHODS: An online PubMed search was performed to identify studies on caries research using CBCT. RESULTS: Despite its usefulness, there were inherent limitations in the detection of caries lesions through conventional radiograph mainly due to the two-dimensional (2D) representation of caries lesions. Several efforts were made to investigate the three-dimensional (3D) image of lesion, only to gain little popularity. Recently, CBCT was introduced and has been used for diagnosis of caries in several reports. Some of them maintained the superiority of CBCT systems, however it is still under controversies. CONCLUSION: The CBCT systems are promising, however they should not be considered as a primary choice of caries diagnosis in everyday practice yet. Further studies under more standardized condition should be performed in the near future.
Cone-Beam Computed Tomography ; Dental Caries

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Digital subtraction radiography in TMJ imaging: A critique.

Galal OMAMI

Imaging Science in Dentistry.2017;47(3):215-217. doi:10.5624/isd.2017.47.3.215

No abstract available.
Evaluation Studies as Topic* ; Radiography* ; Temporomandibular Joint*

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Central giant cell lesion of the mandible in a 2-year old girl.

Takaaki ODA ; Mikiko SUE ; Yasuo OKADA ; Yoriaki KANRI ; Junya ONO ; Ichiro OGURA

Imaging Science in Dentistry.2017;47(3):209-213. doi:10.5624/isd.2017.47.3.209

Central giant cell lesions are rare, benign, osteolytic, pseudocystic, solitary, localized lesions that are common in the skeletal structure, but less so in the maxillofacial region. Furthermore, to perform panoramic radiography and cone-beam computed tomography, it is necessary to prepare patients properly and to position their heads carefully. However, this can be difficult in pediatric patients, who may be anxious. In this report, we describe the case of a central giant cell lesion of the mandible in a 2-year-old girl that was evaluated with multidetector computed tomography.
Child ; Child, Preschool ; Cone-Beam Computed Tomography ; Female* ; Giant Cells* ; Granuloma, Giant Cell ; Head ; Humans ; Mandible* ; Multidetector Computed Tomography ; Radiography, Panoramic

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Optimizing the reconstruction filter in cone-beam CT to improve periodontal ligament space visualization: An in vitro study.

Yuuki HOUNO ; Toshimitsu HISHIKAWA ; Ken ichi GOTOH ; Munetaka NAITOH ; Akio MITANI ; Toshihide NOGUCHI ; Eiichiro ARIJI ; Yoshie KODERA

Imaging Science in Dentistry.2017;47(3):199-207. doi:10.5624/isd.2017.47.3.199

PURPOSE: Evaluation of alveolar bone is important in the diagnosis of dental diseases. The periodontal ligament space is difficult to clearly depict in cone-beam computed tomography images because the reconstruction filter conditions during image processing cause image blurring, resulting in decreased spatial resolution. We examined different reconstruction filters to assess their ability to improve spatial resolution and allow for a clearer visualization of the periodontal ligament space. MATERIALS AND METHODS: Cone-beam computed tomography projections of 2 skull phantoms were reconstructed using 6 reconstruction conditions and then compared using the Thurstone paired comparison method. Physical evaluations, including the modulation transfer function and the Wiener spectrum, as well as an assessment of space visibility, were undertaken using experimental phantoms. RESULTS: Image reconstruction using a modified Shepp-Logan filter resulted in better sensory, physical, and quantitative evaluations. The reconstruction conditions substantially improved the spatial resolution and visualization of the periodontal ligament space. The difference in sensitivity was obtained by altering the reconstruction filter. CONCLUSION: Modifying the characteristics of a reconstruction filter can generate significant improvement in assessments of the periodontal ligament space. A high-frequency enhancement filter improves the visualization of thin structures and will be useful when accurate assessment of the periodontal ligament space is necessary.
Cone-Beam Computed Tomography* ; Diagnosis ; Evaluation Studies as Topic ; Image Processing, Computer-Assisted ; In Vitro Techniques* ; Matched-Pair Analysis ; Methods ; Periodontal Ligament* ; Phantoms, Imaging ; Skull ; Stomatognathic Diseases

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