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Raj G, Raj M, Saigo L. Accuracy of conventional versus cone-beam CT-synthesised lateral cephalograms for cephalometric analysis: A systematic review. J Orthod 2024; 51:160-176. [PMID: 37340975 DOI: 10.1177/14653125231178038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/22/2023]
Abstract
OBJECTIVE To assess the accuracy of cone-beam computed tomography (CBCT)-synthesised lateral cephalograms (CSLCs) compared with conventional lateral cephalograms for cephalometric analysis in human participants and skull models. METHODS The authors performed a search of PubMed, Scopus, Google Scholar and Embase databases on 4 October 2021. Included studies met the following criteria: published in English; compared conventional lateral cephalograms and CSLCs; assessed hard- and soft-tissue landmarks; and were performed on human or skull models. Data extraction from eligible studies was performed by two independent reviewers. The quality of evidence was assessed using the Joanna Briggs Institute (JBI) Critical Appraisal Checklist tool - diagnostic accuracy studies. RESULTS A total of 20 eligible articles were included in this systematic review. Of these 20 studies, 17 presented with a low risk of bias, while three were found to have a moderate risk of bias. Hard- and soft-tissue analyses were evaluated for each imaging modality. The findings reveal that CSLCs are accurate and comparable to conventional lateral cephalograms for cephalometric analysis and demonstrate good inter-observer reliability. Four studies reported a higher accuracy with CSLCs. CONCLUSION Overall, the diagnostic accuracy and reproducibility of CSLCs were comparable to conventional lateral cephalograms in cephalometric analysis. It is justified that patients who have an existing CBCT scan do not need an additional lateral cephalogram, minimising unnecessary radiation exposure, expenses and time for the patient. Larger voxel sizes and low-dose CBCT protocols can be considered to minimise radiation exposure. REGISTRATION This study was registered with PROSPERO (CRD42021282019).
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Affiliation(s)
- Grace Raj
- National Dental Centre Singapore, Singapore
| | - Mary Raj
- National Dental Centre Singapore, Singapore
| | - Leonardo Saigo
- Department of Oral & Maxillofacial Surgery, National Dental Centre Singapore, Singapore
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Christiaens V, Pauwels R, Mowafey B, Jacobs R. Accuracy of Intra-Oral Radiography and Cone Beam Computed Tomography in the Diagnosis of Buccal Bone Loss. J Imaging 2023; 9:164. [PMID: 37623696 PMCID: PMC10455186 DOI: 10.3390/jimaging9080164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 08/02/2023] [Accepted: 08/11/2023] [Indexed: 08/26/2023] Open
Abstract
BACKGROUND The use of cone beam computed tomography (CBCT) in dentistry started in the maxillofacial field, where it was used for complex and comprehensive treatment planning. Due to the use of reduced radiation dose compared to a computed tomography (CT) scan, CBCT has become a frequently used diagnostic tool in dental practice. However, published data on the accuracy of CBCT in the diagnosis of buccal bone level is lacking. The aim of this study was to compare the accuracy of intra-oral radiography (IOR) and CBCT in the diagnosis of the extent of buccal bone loss. METHODS A dry skull was used to create a buccal bone defect at the most coronal level of a first premolar; the defect was enlarged apically in steps of 1 mm. After each step, IOR and CBCT were taken. Based on the CBCT data, two observers jointly selected three axial slices at different levels of the buccal bone, as well as one transverse slice. Six dentists participated in the radiographic observations. First, all observers received the 10 intra-oral radiographs, and each observer was asked to rank the intra-oral radiographs on the extent of the buccal bone defect. Afterwards, the procedure was repeated with the CBCT scans based on a combination of axial and transverse information. For the second part of the study, each observer was asked to evaluate the axial and transverse CBCT slices on the presence or absence of a buccal bone defect. RESULTS The percentage of buccal bone defect progression rankings that were within 1 of the true rank was 32% for IOR and 42% for CBCT. On average, kappa values increased by 0.384 for CBCT compared to intra-oral radiography. The overall sensitivity and specificity of CBCT in the diagnosis of the presence or absence of a buccal bone defect was 0.89 and 0.85, respectively. The average area under the curve (AUC) of the receiver operating curve (ROC) was 0.892 for all observers. CONCLUSION When CBCT images are available for justified indications, other than bone level assessment, such 3D images are more accurate and thus preferred to 2D images to assess periodontal buccal bone. For other clinical applications, intra-oral radiography remains the standard method for radiographic evaluation.
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Affiliation(s)
- Véronique Christiaens
- Department of Periodontology and Oral Implantology, Faculty of Medicine and Health Sciences, Dental School, Ghent University, C. Heymanslaan 10, 9000 Ghent, Belgium
| | - Ruben Pauwels
- Department of Dentistry and Oral Health, Aarhus University, 8000 Aarhus, Denmark;
- OMFS IMPATH, Department of Imaging & Pathology, Faculty of Medicine, KU Leuven and Maxillofacial Surgery, University Hospitals Leuven, 3000 Leuven, Belgium;
- Department of Radiology, Chulalongkorn University, 10330 Bangkok, Thailand
| | - Bassant Mowafey
- OMFS IMPATH, Department of Imaging & Pathology, Faculty of Medicine, KU Leuven and Maxillofacial Surgery, University Hospitals Leuven, 3000 Leuven, Belgium;
- Department of Oral medicine, Periodontology, Diagnosis and Oral radiology, Faculty of Dentistry, Mansoura University, 35516 Mansoura, Egypt
| | - Reinhilde Jacobs
- OMFS IMPATH, Department of Imaging & Pathology, Faculty of Medicine, KU Leuven and Maxillofacial Surgery, University Hospitals Leuven, 3000 Leuven, Belgium;
- Department of Dental Medicine, Karolinska Institutet, 14152 Huddinge, Sweden
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Grillo R. Orthognathic Surgery: A Bibliometric Analysis of the Top 100 Cited Articles. J Oral Maxillofac Surg 2021; 79:2339-2349. [PMID: 34245705 DOI: 10.1016/j.joms.2021.06.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 05/19/2021] [Accepted: 06/02/2021] [Indexed: 10/21/2022]
Abstract
PURPOSE An increasing number of articles on orthognathic surgery are published every year. This paper aims to provide a list of the top 100 cited articles on orthognathic surgery to help any professional level with interest in this topic and to map the trends of orthognathic surgery publications over time. METHODS A bibliographic search (retrospective study) following STROBE guidelines was performed on Google Scholar (GS) and Dimensions with the term "orthognathic surgery" in the title, abstract, and keywords. The number of citations, citations per year, authors, and publication year were evaluated. A ranking was created in GS citations order with the top 100 cited articles and variables discussed individually. A graphical illustration of keywords was created using VOSviewer. These steps are fundamental in creating this list and relating it to all published articles on the topic. RESULTS A helpful list of the top 100 articles was developed to help professionals in entirely different manners. Virtual planning and complications in orthognathic surgery were the most cited topics, with a 95% confidence interval (P < .05). Some curiosities are discussed, such as increasing interest in surgery first and the relation between airway/obstructive sleep apnea and orthognathic surgery. CONCLUSIONS Bibliometric and altmetric analysis for free using Google Scholar and Dimensions is laborious but possible. Bibliometrics is a powerful tool to become actualized at any health professional level, from students to academics; and could save considerable effort and time for parties interested in the topic. Appropriate keywords are a crucial step to wider article dissemination.
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Affiliation(s)
- Ricardo Grillo
- Assistant Professor, Department of Oral & Maxillofacial Surgery, Faculdade São Leopoldo Mandic, Campinas, Brazil.
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Mark R, Mohan R, Gundappa M, Balaji MDS, Vijay VK, Umayal M. Comparative Evaluation of Periodontal Osseous Defects Using Direct Digital Radiography and Cone-Beam Computed Tomography. JOURNAL OF PHARMACY AND BIOALLIED SCIENCES 2021; 13:S306-S311. [PMID: 34447099 PMCID: PMC8375921 DOI: 10.4103/jpbs.jpbs_804_20] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Accepted: 12/09/2020] [Indexed: 11/26/2022] Open
Abstract
OBJECTIVES To evaluate and compare the accuracy of Direct Digital Radiography (DDR) and cone-beam computed tomography (CBCT) in determination and diagnosis of periodontal osseous defects. METHODS A nonrandomized in vivo study was conducted to compare the two imaging modalities, DDR and CBCT, for the diagnosis of periodontal osseous defects. Comparison was made between the linear measurements of DDR and CBCT images with the actual measurements of various osseous defects during surgical exposure (Gold standard). RESULTS The results of the present study demonstrated the difference in the mean values of the DDR and surgical exposure measurements of periodontal osseous defects, whereas comparable mean values were found between the CBCT and surgical exposure measurements, with no statistically significant difference (P > 0.05) being found between each modality. CONCLUSION CBCT proved to be an indispensable imaging tool in detecting and quantifying periodontal defects and furcation involvement more precisely and could provide additional benefits over the traditional radiography for clinical and postsurgical evaluation.
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Affiliation(s)
- Ruhi Mark
- Department of Periodontology, Christian Dental College and Research Centre, CMC Ludhiana, Punjab, India
| | - Ranjana Mohan
- Department of Periodontology, RVS Dental College and Hospital, Coimbatore, Tamil Nadu, India
| | - M Gundappa
- Department of Conservative Dentistry and Endodontics, RVS Dental College and Hospital, Coimbatore, Tamil Nadu, India
| | - M. D. Saravana Balaji
- Department of Periodontology, RVS Dental College and Hospital, Coimbatore, Tamil Nadu, India
| | - V. K. Vijay
- Department of Periodontology Best Dental College and Hospital, Madurai, Tamil Nadu, India
| | - M. Umayal
- Department of Periodontology Best Dental College and Hospital, Madurai, Tamil Nadu, India
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Takizawa H, Takahashi M, Maki K. Three-Dimensional Assessment of Craniofacial Features in Patients With Down Syndrome During the Mixed Dentition Period: A Case-Control Study. Cleft Palate Craniofac J 2021; 59:177-184. [PMID: 33685243 DOI: 10.1177/1055665621998181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVES Down syndrome (DS) is a common congenital chromosomal disorder related to trisomy 21. Lateral cephalometric radiography studies have shown that patients with DS have characteristic craniofacial morphology; however, no 3-dimensional analysis studies have been performed to investigate the craniofacial features, including volumetric aspects, of patients with DS. The present study was performed to evaluate the craniofacial features, including volumetric aspects, of patients with DS and to compare these findings with control participants using cone beam computed tomography (CBCT). MATERIALS AND METHODS The study sample consisted of 12 patients with DS and 12 control participants. All participants were examined by means of CBCT; the resulting images were used for evaluation of maxillary and mandibular volume, cranial base, and craniofacial measurements. Differences between patients with DS and control participants were statistically analyzed using Student t test. RESULTS Compared to control participants, patients with DS exhibited statistically significant reductions in maxillary and mandibular volumes. Both sagittal and axial cranial base linear measurements were shorter in patients with DS than in control participants. In contrast, the cranial base angle was enhanced in patients with DS, compared with control participants. Moreover, condylion (Co)-gnathion, anterior nasal spine-menton, and Co-subspinale (point A) measurements were shorter in patients with DS than in control participants; the sella-nasion-mandibular plane angle was significantly reduced in patients with DS, compared with control participants. CONCLUSION Our results suggest that patients with DS have distinct skeletal volume and craniofacial morphology features, relative to individuals without DS.
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Affiliation(s)
- Hideomi Takizawa
- Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan
| | - Masahiro Takahashi
- Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan
| | - Koutaro Maki
- Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan
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Song D, Shujaat S, de Faria Vasconcelos K, Huang Y, Politis C, Lambrichts I, Jacobs R. Diagnostic accuracy of CBCT versus intraoral imaging for assessment of peri-implant bone defects. BMC Med Imaging 2021; 21:23. [PMID: 33568085 PMCID: PMC7877020 DOI: 10.1186/s12880-021-00557-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Accepted: 02/01/2021] [Indexed: 01/28/2023] Open
Abstract
Background Early detection of marginal bone loss is vital for treatment planning and prognosis of teeth and implant. This study was conducted to assess diagnostic accuracy of CBCT compared to intra-oral (IO) radiography for detection, classification, and measurement of peri-implant bone defects in an animal model. Methods Fifty-four mandible blocks with implants were harvested from nine male health adult beagle dogs with acquisition of IO, CBCT and micro-CT images from all samples. Peri-implant bone defects from 16 samples were diagnosed using micro-CT and classified into 3 defect categories: dehiscence (n = 5), infrabony defect (n = 3) and crater-like defect (n = 8). Following training and calibration of the observers, they asked to detect location (mesial, distal, buccal, lingual) and shape of the defect (dehiscence, horizontal defect, vertical defect, carter-like defect) utilizing both IO and CBCT images. Both observers assessed defect depth and width on IO, CBCT and micro-CT images at each side of peri-implant bone defect via CT-analyzer software. Data were analyzed using SPSS software and a p value of < 0.05 was considered as statistically significant. Results Overall, there was a high diagnostic accuracy for detection of bone defects with CBCT images (sensitivity: 100%/100%), while IO images showed a reduction in accuracy (sensitivity: 69%/63%). Similarly, diagnostic accuracy for defect classification was significantly higher for CBCT, whereas IO images were unable to correctly identify vestibular dehiscence, with incorrect assessment of half of the infrabony defects. For accuracy of measuring defect depth and width, a higher correlation was observed between CBCT and gold standard micro-CT (r = 0.91, 95% CI 0.86–0.94), whereas a lower correlation was seen for IO images (r = 0.82, 95% CI 0.67–0.91). Conclusions The diagnostic accuracy and reliability of CBCT was found to be superior to IO imaging for the detection, classification, and measurement of peri-implant bone defects. The application of CBCT adds substantial information related to the peri-implant bone defect diagnosis and decision-making which cannot be achieved with conventional IO imaging.
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Affiliation(s)
- Dandan Song
- OMFS IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, KU Leuven and Oral and Maxillofacial Surgery, University Hospitals Leuven, Kapucijnenvoer 33, 3000, Leuven, Belgium.
| | - Sohaib Shujaat
- OMFS IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, KU Leuven and Oral and Maxillofacial Surgery, University Hospitals Leuven, Kapucijnenvoer 33, 3000, Leuven, Belgium
| | - Karla de Faria Vasconcelos
- OMFS IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, KU Leuven and Oral and Maxillofacial Surgery, University Hospitals Leuven, Kapucijnenvoer 33, 3000, Leuven, Belgium
| | - Yan Huang
- OMFS IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, KU Leuven and Oral and Maxillofacial Surgery, University Hospitals Leuven, Kapucijnenvoer 33, 3000, Leuven, Belgium.,West China College of Stomatology, State Key Laboratory of Oral Disease & National Clinical Research Center for Oral Disease, Sichuan University, Chengdu, China
| | - Constantinus Politis
- OMFS IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, KU Leuven and Oral and Maxillofacial Surgery, University Hospitals Leuven, Kapucijnenvoer 33, 3000, Leuven, Belgium
| | - Ivo Lambrichts
- Department of Morphology, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Reinhilde Jacobs
- OMFS IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, KU Leuven and Oral and Maxillofacial Surgery, University Hospitals Leuven, Kapucijnenvoer 33, 3000, Leuven, Belgium.,Department of Dental Medicine, Karolinska Institute, Stockholm, Sweden
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Banari AS, Datana S, Agarwal SS, Bhandari SK. Does Presurgical Nasoalveolar Molding Have a Long-Term Effect on Nasal and Upper Airway Dimensions? Cleft Palate Craniofac J 2020; 58:1257-1264. [PMID: 33356522 DOI: 10.1177/1055665620980234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVES To compare nasal and upper airway dimensions in patients with cleft lip and palate (CLP) who underwent nasoalveolar molding (NAM) with those without NAM during infancy using acoustic pharyngometry and rhinometry. MATERIALS AND METHODS Eccovision acoustic pharyngometry and rhinometry (Sleep Group Solutions) was used for assessment of mean area and volume of nasal and upper airway in patients with complete unilateral CLP (age range 16-21 years) treated with NAM (group 1, n = 19) versus without NAM (group 2, n = 22). RESULTS The mean nasal cross-sectional areas and volume were higher in group 1 compared to group 2 on both cleft (P value <.001) and noncleft side (P value >.05). The mean area and volume of upper airway were also significantly higher in group 1 compared to group 2 (P value <.05). CONCLUSIONS Nasoalveolar molding being one of the first interventions in chronology of treatment of patients with CLP, its long-term outcome on nasal and upper airway patency needs to be ascertained. The results of the present study show that the patients with CLP who have undergone NAM during infancy have better improvement in nasal and upper airway patency compared with those who had not undergone NAM procedure. The basic advantages of being noninvasive, nonionizing and providing dynamic assessment of nasal and upper airway patency make acoustic pharyngometry and rhinometry a diagnostic tool of choice to be used in patients with CLP.
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Affiliation(s)
- Ashwina S Banari
- Department of Orthodontics and Dentofacial Orthopedics, 355441Armed Forces Medical College, Pune, India
| | - Sanjeev Datana
- Department of Orthodontics and Dentofacial Orthopedics, 355441Armed Forces Medical College, Pune, India
| | - Shiv Shankar Agarwal
- Department of Orthodontics and Dentofacial Orthopedics, 355441Armed Forces Medical College, Pune, India
| | - Sujit Kumar Bhandari
- Department of Dental surgery & Oral Health Sciences, 355441Armed Forces Medical College, Pune, India
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Onimaru M, Takahashi M, Shimazaki A, Kimura H, Inou N, Maki K. Verification of mechanical load generated by functional orthodontic appliances. J Biomech 2020; 113:110079. [PMID: 33254058 DOI: 10.1016/j.jbiomech.2020.110079] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 10/04/2020] [Accepted: 10/16/2020] [Indexed: 11/17/2022]
Abstract
Functional appliances are widely used for promoting mandibular growth by utilizing a construction bite position. We aimed to measure the mechanical load generated by movement of functional appliances and determine the factors influencing this load. Thirteen patients aged 8-12 years were selected for the study, and the load was measured using a previously developed measurement device. To investigate the factors affecting the load, the temporomandibular joint morphology and muscles related to the mandible were examined using cone-beam computed tomography. The standard regression coefficients of the factors affecting the load per millimeter of movement distance were 0.64 and 0.66 for (a) the inclination of the articular eminence and (b) the angle between occlusal plane and posterior temporalis, respectively. Measurement of the occlusal plane to the posterior temporalis and the inclination of the articular eminence were significantly different (p < 0.05). The angle of inclination of the articular eminence emerged as a strong influencing factor. Similarly, the influence of measurements from the occlusal plane to the posterior temporalis was considerable since the posterior temporalis muscle is the most active when the mandible is extended forward. We also found a possible relationship between the occlusal force and load at the construction bite position. To our knowledge, this is the first study to determine the actual load associated with the angle of the temporalis muscle to the occlusal plane, inclination angle of the articular eminence, angle between the occlusal plane and the Frankfort plane, and the angle between the geniohyoid muscle and the occlusal plane. Therefore, mechanical considerations need to be more accurate to facilitate safe orthodontic treatment.
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Affiliation(s)
- Minako Onimaru
- Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan.
| | - Masahiro Takahashi
- Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan
| | - Aya Shimazaki
- Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan
| | - Hitoshi Kimura
- Department of Engineering Design, Tamagawa University, Tokyo, Japan
| | - Norio Inou
- Organization for Fundamental Research Institute of Innovative Research, Tokyo Institute of Technology, Tokyo, Japan
| | - Koutaro Maki
- Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan
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Corte-Real A, Kato RM, Nunes T, Vale F, Garib D. Reproducibility of mandibular landmarks for three-dimensional assessment. FORENSIC SCIENCE INTERNATIONAL: REPORTS 2020. [DOI: 10.1016/j.fsir.2020.100144] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Treatment of Obstructive Sleep Apnea-Hypopnea Syndrome With a Mandible Advanced Device Increases Nitric Oxide Release and Ameliorates Pulmonary Hypertension in Rabbits. J Oral Maxillofac Surg 2020; 79:694.e1-694.e12. [PMID: 33259783 DOI: 10.1016/j.joms.2020.09.043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2020] [Revised: 09/22/2020] [Accepted: 09/25/2020] [Indexed: 11/21/2022]
Abstract
PURPOSE To investigate the effects of mandible advanced device (MAD) therapy for obstructive sleep apnea-hypopnea syndrome (OSAHS) on nitric oxide (NO) release and changes in pulmonary artery pressure and structure. METHODS Thirty male New Zealand white rabbits were randomly divided into OSAHS, MAD, and control groups (n = 10 per group). The soft palate of rabbits in the OSAHS and MAD groups was injected with hydrophilic polyacrylamide gel to induce OSAHS. The MAD group wore a MAD, and the control group was not treated. Cone-beam computed tomography scans and polysomnography recordings were performed to confirm successful model establishment. All rabbits slept in a supine position for 4 to 6 hours daily and were observed for 8 consecutive weeks. The pulmonary artery pressure was measured by right heart catheterization. Pulmonary artery morphometry was analyzed by hematoxylin and eosin staining. NO levels in plasma and lung homogenate supernatants were detected by Griess reaction assay kits. RESULTS The OSAHS group exhibited higher pulmonary artery pressure (57.74 ± 1.79 mm Hg) than the MAD (19.99 ± 2.04 mm Hg) and control (14.49 ± 0.54 mm Hg) groups. The media thickness percentage of the pulmonary artery was higher in the OSAHS group (46.89 ± 2.72%) than the control group (15.87 ± 1.18%) and was markedly reduced by MAD (21.64 ± 1.45%). Blood oxygen saturation was positively correlated with the NO concentration in both the lung and plasma, and the NO concentration was negatively correlated with the media thickness percentage and media section percentage. CONCLUSIONS OSAHS induced a decrease in NO and pulmonary hypertension, which was relieved by MAD therapy.
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Prognosis for the impacted lower third molars: Panoramic reconstruction versus tomographic images. Oral Surg Oral Med Oral Pathol Oral Radiol 2020; 130:625-631. [PMID: 32981872 DOI: 10.1016/j.oooo.2020.07.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Revised: 06/18/2020] [Accepted: 07/11/2020] [Indexed: 11/23/2022]
Abstract
OBJECTIVE The aim of this cross-sectional accuracy study was to compare panoramic reconstruction (PR) and multiplanar reconstruction (MPR) images, which are used to establish the prognosis for impacted mandibular third molars in relation to professional decision making. STUDY DESIGN Images of 10 patients who had undergone cone beam computed tomography (CBCT) examination were selected, resulting in 2 distinct groups of images, with 10 in each group: PR and MPR. To check prognostic accuracy, 2 images from each group were randomly selected and reinserted into the sample, totaling 24 images. A questionnaire was completed by 54 professionals: 27 orthodontists and 27 oral and maxillofacial surgeons (OMFSs). Data were evaluated by using the χ2 and McNemar's tests and Kappa statistics at P < .05. RESULTS There were no statistically significant differences when isolated PR images were compared with MPR images by orthodontists (P = .72) or OMFSs (P = .45). However, there were significant differences in the professional decision regarding the prognosis for impacted teeth, where OMFSs indicated the need for more extractions compared with orthodontists (P < .0001). CONCLUSIONS There are no differences between PR and multiplanar CBCT images with regard to the determination of the prognosis for impacted mandibular third molars. However, there was a difference in the decision making between the different specialties.
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Three-dimensional analysis of pharyngeal airway morphology in Japanese female adolescents. ACTA ACUST UNITED AC 2019. [DOI: 10.1016/j.odw.2017.01.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Shrestha A, Takahashi M, Yamaguchi T, Adel M, Furuhata M, Hikita Y, Yoshida H, Nakawaki T, Maki K. Three-dimensional evaluation of mandibular volume in patients with cleft lip and palate during the deciduous dentition period. Angle Orthod 2019; 90:85-91. [PMID: 31398065 DOI: 10.2319/112618-831.1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
OBJECTIVES To examine the relationship between mandibular volume and craniofacial morphology in patients with cleft lip and palate using cone beam computed tomography (CBCT) and to compare these findings with control (noncleft) patients undergoing CBCT for other purposes during the deciduous dentition period. MATERIALS AND METHODS Eighty-four patients were categorized into the unilateral cleft lip and alveolus (UCLA) group (n = 25; mean age, 4.60 ± 0.40 years), unilateral cleft lip and palate (UCLP) group (n = 23; mean age, 4.52 ± 0.39 years), bilateral cleft lip and palate (BCLP) group (n = 22; mean age, 4.54 ± 0.37 years), and control group without cleft (n = 14; mean age, 5.19 ± 0.52 years). Mandibular volume and craniofacial cephalometric measurements were obtained using CBCT. All measurements were assessed by analysis of covariance (ANCOVA) using Bonferroni post hoc pairwise comparison tests. RESULTS ANCOVA revealed no statistically significant differences in mandibular volume among the groups. SNA° and ANB° were significantly larger in the UCLA and BCLP groups than in the control group. SN-MP° was smallest in the UCLA group. Co-A in the UCLP group was shorter than in the UCLA and BCLP groups. Go-Gn was shortest in the UCLP and BCLP groups compared with the control group. CONCLUSIONS Three-dimensional evaluation of craniofacial morphology using CBCT can provide valuable information on malocclusion and other dentoskeletal problems among patients with CLP.
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Takahashi M, Yamaguchi T, Lee MK, Suzuki Y, Adel M, Tomita D, Nakawaki T, Yoshida H, Hikita Y, Furuhata M, Tsuneoka M, Nagahama R, Marazita ML, Weinberg SM, Maki K. Three-dimensional assessment of the pharyngeal airway in Japanese preschoolers with orofacial clefts. Laryngoscope 2019; 130:533-540. [PMID: 30977521 DOI: 10.1002/lary.27957] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 02/15/2019] [Accepted: 03/13/2019] [Indexed: 12/11/2022]
Abstract
OBJECTIVES/HYPOTHESIS Individuals with orofacial clefts often experience respiratory problems because of nasopharyngeal abnormalities. Pharyngeal airway morphology is thought to differ among the various cleft types. We measured three-dimensional (3D) airway volume using cone-beam computed tomography (CBCT) analysis to evaluate and compare pharyngeal airways in Japanese preschoolers with and without orofacial clefts. STUDY DESIGN Retrospective case-control study. METHODS We enrolled 83 subjects (37 boys, 46 girls; mean age = 4.66 ± 0.56 years) with nonsyndromic orofacial clefts and 16 noncleft healthy subjects (seven boys, nine girls; mean age = 5.30 ± 0.52 years) as controls. The subjects were divided into five groups. Four groups were based on the cleft type: isolated cleft palate, unilateral cleft lip and alveolus), unilateral cleft lip and palate, and bilateral cleft lip and palate. The fifth group included the noncleft controls. All subjects were examined with CBCT, and the 3D airway volume was measured. We analyzed group differences statistically using analysis of covariance with the Bonferroni post hoc pairwise comparison tests for the corrected means. RESULTS Compared with the noncleft group, each cleft group exhibited significantly decreased total and nasal airway volumes and increased superior and inferior pharyngeal airway volumes. The differences were all statistically significant. CONCLUSIONS Our findings suggest that anatomical differences exist in pharyngeal airway volumes among various cleft groups and in those without a cleft. LEVEL OF EVIDENCE 3b Laryngoscope, 130:533-540, 2020.
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Affiliation(s)
- Masahiro Takahashi
- Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan
| | - Tetsutaro Yamaguchi
- Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan
| | - Myoung K Lee
- Department of Oral Biology, Center for Craniofacial and Dental Genetics, Pittsburgh, Pennsylvania, U.S.A
| | - Yoko Suzuki
- Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan
| | - Mohamed Adel
- Department of Orthodontics, Suez Canal University, Ismailia, Egypt
| | - Daisuke Tomita
- Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan
| | - Takatoshi Nakawaki
- Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan
| | - Hiroshi Yoshida
- Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan
| | - Yu Hikita
- Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan
| | - Mayu Furuhata
- Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan
| | - Misato Tsuneoka
- Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan
| | - Ryo Nagahama
- Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan
| | - Mary L Marazita
- Department of Oral Biology, Center for Craniofacial and Dental Genetics, Pittsburgh, Pennsylvania, U.S.A.,Department of Human Genetics, Graduate School of Public Health, Clinical and Translational Science Institute, Pittsburgh, Pennsylvania, U.S.A.,Department of Human Genetics, Clinical and Translational Science Institute, Pittsburgh, Pennsylvania, U.S.A.,Department of Psychiatry, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, U.S.A
| | - Seth M Weinberg
- Department of Oral Biology, Center for Craniofacial and Dental Genetics, Pittsburgh, Pennsylvania, U.S.A.,Department of Human Genetics, Graduate School of Public Health, Clinical and Translational Science Institute, Pittsburgh, Pennsylvania, U.S.A.,Department of Anthropology, University of Pittsburgh, Pittsburgh, Pennsylvania, U.S.A
| | - Koutaro Maki
- Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan
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15
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Hasebe A, Yamaguchi T, Nakawaki T, Hikita Y, Katayama K, Maki K. Comparison of condylar size among different anteroposterior and vertical skeletal patterns using cone-beam computed tomography. Angle Orthod 2018; 89:306-311. [PMID: 30475648 DOI: 10.2319/032518-229.1] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
OBJECTIVES To compare condylar size among different anteroposterior and vertical skeletal patterns using cone-beam computed tomography (CBCT). MATERIALS AND METHODS The study included 166 subjects (61 men, mean age: 27.2 ± 7.6 years; 105 women, mean age: 27.4 ± 9.2 years). The anteroposterior skeletal patterns of the subjects were classified into Classes I (-1° ≤ A point-nasion-B point angle [ANB] < 4°), II (ANB ≥ 4°), and III (ANB < -1°). The vertical skeletal patterns were classified into hypodivergent (mandibular plane [MP] ≤ 23°), normodivergent (23° < MP < 30°), and hyperdivergent (MP ≥ 30°) groups. The condylar length, height, and width were examined using CBCT images. Analysis of covariance was used to compare three condylar size measurements among the three anteroposterior groups and the three vertical groups using sex as a covariate. Both left and right sides were examined. Nine groups were further divided according to the anteroposterior and vertical groups, and two-way analysis of covariance (ANCOVA) was applied to estimate the composite effect of skeletal patterns in both directions. RESULTS Sex as a covariate showed statistical significance in most examinations. The condylar height on both sides had statistically different anteroposterior skeletal patterns ( P < .001). The condylar width on both sides also had statistically different vertical skeletal patterns ( P < .001). After adjusting for sex, the condylar height and width on both sides increased from Class II, Class I, and Class III. The condylar width on both sides increased from the hypodivergent group, the normodivergent group, and the hyperdivergent group. No composite effect of skeletal patterns in both directions was observed. CONCLUSIONS Condylar height and width considerably differed among subjects with different anteroposterior or vertical skeletal patterns. The anteroposterior or vertical skeletal patterns independently affected the condylar size.
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Chen H, Chen CY, Fang QQ, Zhang MX, Zhao WY, Wang XF, Tan WQ, Zhang LY. Computed Tomography-Assisted Auricular Cartilage Graft for Depression of the Alar Base in Secondary Unilateral Cleft Lip Repair: A Preliminary Report. Cleft Palate Craniofac J 2018; 56:39-45. [PMID: 29652536 DOI: 10.1177/1055665618770306] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
OBJECTIVES To evaluate the feasibility, effectiveness, and safety of computed tomography-assisted auricular cartilage grafting for treating alar base depression secondary to unilateral cleft lip. DESIGN AND SETTING For patients with obvious depression of the alar base, the difference in heights of the alar base and the piriform margin between the cleft side and the noncleft side were measured with computed tomography. If both were >3.0 mm, the cartilage was harvested postauricularly and subdivided into 2 to 4 pieces. A multiple layer graft was inserted under the depressed alar base. The procedure was performed from 2006 to 2013, and the follow-up period was 3 to 15 months. PARTICIPANTS Chinese patients with alar base depression secondary to unilateral cleft lip were selected. INTERVENTION Suture and cartilage graft techniques. MAIN OUTCOMES MEASURES Differences in bilateral alar base heights and piriform apertures. RESULTS There was no wound dehiscence, exposure of bone, or donor site morbidity. The difference in heights in the bilateral alar bases and piriform apertures decreased. There were no obvious scars in any of the cases. CONCLUSIONS This technique has several advantages including ease of operation, minimal trauma, satisfactory outcomes, and useful references for operation provided by computed tomography. It is a superior alternative for reconstruction of secondary alar depression.
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Affiliation(s)
- Hong Chen
- 1 Department of Stomatology, Zhejiang Provincial People's Hospital, People's Hospital of Hangzhou Medical College, Hangzhou, People's Republic of China
| | - Chun-Ye Chen
- 2 Department of Plastic Surgery, The Fourth Affiliated Hospital, School of Medicine, Zhejiang University, Yiwu, People's Republic of China
| | - Qing-Qing Fang
- 2 Department of Plastic Surgery, The Fourth Affiliated Hospital, School of Medicine, Zhejiang University, Yiwu, People's Republic of China
| | - Min-Xia Zhang
- 2 Department of Plastic Surgery, The Fourth Affiliated Hospital, School of Medicine, Zhejiang University, Yiwu, People's Republic of China
| | - Wan-Yi Zhao
- 2 Department of Plastic Surgery, The Fourth Affiliated Hospital, School of Medicine, Zhejiang University, Yiwu, People's Republic of China
| | - Xiao-Feng Wang
- 2 Department of Plastic Surgery, The Fourth Affiliated Hospital, School of Medicine, Zhejiang University, Yiwu, People's Republic of China
| | - Wei-Qiang Tan
- 2 Department of Plastic Surgery, The Fourth Affiliated Hospital, School of Medicine, Zhejiang University, Yiwu, People's Republic of China.,3 Department of Plastic Surgery, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, People's Republic of China
| | - Li-Yun Zhang
- 4 Department of Pediatrics, The Fourth Affiliated Hospital, School of Medicine, Zhejiang University, Yiwu, People's Republic of China.,5 Department of Pediatrics, Tianxiang East Hospital, Yiwu, People's Republic of China
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Virtual Planning of a Complex Three-Part Bimaxillary Osteotomy. Case Rep Dent 2018; 2017:8013874. [PMID: 29318057 PMCID: PMC5727690 DOI: 10.1155/2017/8013874] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2017] [Accepted: 11/05/2017] [Indexed: 02/08/2023] Open
Abstract
In maxillofacial surgery, every patient presents special problems requiring careful evaluation. Conventional methods to study the deformities are still reliable, but the advent of tridimensional (3D) imaging, especially computed tomography (CT) scan and laser scanning of casts, created the opportunity to better understanding the skeletal support and the soft tissue structures. Nowadays, virtual technologies are increasingly employed in maxillofacial surgery and demonstrated precision and reliability. However, in complex surgical procedures, these new technologies are still controversial. Especially in the less frequent cases of three-part maxillary surgery, the experience is limited, and scientific literature cannot give a clear support. This paper presents the case of a young patient affected by a complex long face dentofacial deformity treated by a bimaxillary surgery with three-part segmentation of the maxilla. The operator performed the surgical study completely with a virtual workflow. Pre- and postoperative CT scan and optical scanning of plaster models were collected and compared. Every postoperatory maxillary piece was superimposed with the presurgical one, and the differences were examined in a color-coded map. Only mild differences were found near the osteotomy lines, when the bony surface and the teeth demonstrated an excellent coincidence.
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18
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Cohenca N, Silberman A. Contemporary imaging for the diagnosis and treatment of traumatic dental injuries: A review. Dent Traumatol 2017; 33:321-328. [PMID: 28317333 DOI: 10.1111/edt.12339] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/14/2017] [Indexed: 12/15/2022]
Abstract
Traumatic dental injuries (TDI) have an array of presentations. Diagnostic challenges are common and clinicians' ability to correctly identify specific injuries dictates the optimal course of treatment(s). The aim of this review was to outline and assess all dental imaging techniques and their applications to traumatic dental injuries. A particular interest is given to the advancement of 3D imaging techniques and their role in diagnosis and treatment planning. The benefits of achieving a more accurate diagnosis are paramount to perfecting clinical judgments and outcomes.
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Affiliation(s)
- Nestor Cohenca
- Department of Pediatric Dentistry, University of Washington and Private Practice Limited to Endodontics, Everett, WA, USA
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19
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Feragalli B, Rampado O, Abate C, Macrì M, Festa F, Stromei F, Caputi S, Guglielmi G. Cone beam computed tomography for dental and maxillofacial imaging: technique improvement and low-dose protocols. Radiol Med 2017; 122:581-588. [DOI: 10.1007/s11547-017-0758-2] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Accepted: 03/21/2017] [Indexed: 12/01/2022]
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20
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Nakawaki T, Yamaguchi T, Tomita D, Hikita Y, Adel M, Katayama K, Maki K. Evaluation of mandibular volume classified by vertical skeletal dimensions with cone-beam computed tomography. Angle Orthod 2016; 86:949-954. [PMID: 27007754 DOI: 10.2319/103015-732.1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
OBJECTIVE To investigate the relationship between anteroposterior and vertical differences in maxillofacial morphology and mandibular volume. MATERIALS AND METHODS Subjects comprised 213 Japanese adults (84 males and 129 females) who were divided into three groups based on mandibular basal arch (ANB) and Wits, measured in a cephalometric analysis: Class I (-1° ≤ ANB < 4°,-1 mm ≤ Wits < 0 mm), Class II (ANB ≥ 4°, Wits ≥ 0), and Class III (ANB <-1°, Wits <-1 mm). Subjects were also divided into three groups based on the mandibular plane angle (Mp), as follows: hypodivergent (Mp < 23°), normodivergent (Mp = 23-30°), and hyperdivergent (Mp > 30°) groups. Mandibular volume was measured from cone-beam computed tomographic images that were analyzed using Analyze™ image processing software and compared among the three groups in each classification. RESULTS No significant differences were noted in mandibular volume among Classes I, II, and III. An inverse relationship was found between mandibular volume and Mp, and a significant difference was noted in mandibular volume between the hypodivergent and hyperdivergent groups. CONCLUSIONS In addition to two-dimensional analysis, such as lateral cephalometry, three-dimensional information such as volume, provided by cone-beam computed tomography, contributes to a more detailed assessment of maxillofacial morphology.
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Affiliation(s)
- Takatoshi Nakawaki
- a Student, Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan
| | - Tetsutaro Yamaguchi
- b Associate Professor, Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan
| | - Daisuke Tomita
- a Student, Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan
| | - Yu Hikita
- a Student, Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan
| | - Mohamed Adel
- c Research Assistant, Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan
| | - Koshu Katayama
- c Research Assistant, Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan
| | - Koutaro Maki
- d Professor, Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan
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21
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John GP, Joy TE, Mathew J, Kumar VRB. Fundamentals of cone beam computed tomography for a prosthodontist. J Indian Prosthodont Soc 2016; 15:8-13. [PMID: 26929479 PMCID: PMC4762290 DOI: 10.4103/0972-4052.157001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Cone beam computed tomography (CBCT, also referred to as C-arm computed tomography [CT], cone beam volume CT, or flat panel CT) is a medical imaging technique of X-ray CT where the X-rays are divergent, forming a cone.[1] CBCT systems have been designed for imaging hard tissues of the maxillofacial region. CBCT is capable of providing sub-millimeter resolution in images of high diagnostic quality, with short scanning times (10–70 s) and radiation dosages reportedly up to 15–100 times lower than those of conventional CT scans. Increasing availability of this technology provides the dental clinician with an imaging modality capable of providing a three-dimensional representation of the maxillofacial skeleton with minimal distortion. The aim of this article is to sensitize the Prosthodontist to CBCT technology, provide an overview of currently available maxillofacial CBCT systems and review the specific application of various CBCT display modes to clinical Prosthodontic practice. A MEDLINE search for relevant articles in this specific area of interest was conducted. The selected articles were critically reviewed and the data acquired were systematically compiled.
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Affiliation(s)
| | - Tatu Elenjickal Joy
- Department of Oral Medicine and Radiology, Sree Mookambika Institute of Dental Sciences, Kulasekharam, Kanyakumari, Tamil Nadu, India
| | - Justin Mathew
- Department of Oral and Maxillofacial Surgery, Malabar Dental College and Research Centre, Edappal, Kerala, India
| | - Vinod R B Kumar
- Department of Oral and Maxillofacial Pathology, Malabar Dental College and Research Centre, Edappal, Kerala, India
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22
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Akin M, Akgul YE, Ileri Z, Basciftci FA. Three-dimensional evaluation of hybrid expander appliances: A pilot study. Angle Orthod 2016; 86:81-86. [PMID: 25923245 PMCID: PMC8603971 DOI: 10.2319/121214-902.1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Accepted: 02/01/2015] [Indexed: 11/29/2023] Open
Abstract
OBJECTIVE To evaluate transverse dimensional changes in dentoalveolar and skeletal structures caused by hybrid expander, using cone-beam computed tomography (CBCT). MATERIALS AND METHODS The CBCT records of nine patients (five boys and four girls) (mean age 13.61 ± 0.72 years) treated with hybrid expander were examined. CBCT images were taken at pretreatment and after the expansion. ELSA (point equidistant to both foramina spinosa) was determined as a reference point to compare the distances in all three dimensions. Nineteen transversal dimensions and four angles were measured for both right and left sides. Wilcoxon signed rank test was used for statistical comparison at P < .05 levels. RESULTS A V-shaped expansion of suture was successfully achieved in all patients without teeth support. The amount of opening was greater in anterior than posterior and in inferior than superior. An 8.75-mm screw expansion was achieved for all patients. Expansion effects reverberated to maxillary central incisor, canine, first premolar, and first molar at 70%, 75%, 92%, and 89%, respectively. The molar teeth tipped buccally (right 3.06° and left 3.24°) as did premolars (right 2.88° and left 3.02°). CONCLUSION The hybrid expander, minimally invasive expansion appliance that protects teeth by including bone support, can be used easily for rapid maxillary expansion treatment.
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Affiliation(s)
- Mehmet Akin
- Assistant Professor, Department of Orthodontics, Faculty of Dentistry, Selçuk University, Konya, Turkey
| | - Yasin Erdem Akgul
- Research Assistant, Department of Orthodontics, Faculty of Dentistry, Selçuk University, Konya, Turkey
| | - Zehra Ileri
- Assistant Professor, Department of Orthodontics, Faculty of Dentistry, Selçuk University, Konya, Turkey
| | - Faruk Ayhan Basciftci
- Professor, Department of Orthodontics, Faculty of Dentistry, Selçuk University, Konya, Turkey
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Katsumura S, Sato K, Ikawa T, Yamamura K, Ando E, Shigeta Y, Ogawa T. “High-precision, reconstructed 3D model” of skull scanned by conebeam CT: Reproducibility verified using CAD/CAM data. Leg Med (Tokyo) 2016; 18:37-43. [DOI: 10.1016/j.legalmed.2015.11.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2015] [Revised: 11/18/2015] [Accepted: 11/24/2015] [Indexed: 11/28/2022]
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Lee KM, Hwang HS, Cho JH. Comparison of transverse analysis between posteroanterior cephalogram and cone-beam computed tomography. Angle Orthod 2014; 84:715-9. [PMID: 24325622 PMCID: PMC8650435 DOI: 10.2319/072613-555.1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Accepted: 10/01/2013] [Indexed: 11/23/2022] Open
Abstract
OBJECTIVES To evaluate maxillary and mandibular alveolar and basal bone widths using cone-beam computed tomography (CBCT) and to verify the correlation between CBCT images and posteroanterior (PA) cephalograms. MATERIALS AND METHODS The CBCT scans and PA cephalograms were obtained from 20 men (age range = 24.0-29.1 years; mean age = 27.2 years; SD = 2.8 years) and 20 women (age range = 20.3-28.1 years; mean age = 26.4 years; SD = 3.2 years) with normal occlusion. On CBCT images, maxillary and mandibular bone widths were measured at three posterior sites and five bone levels. The differences between maxillary and mandibular bone widths were calculated and compared with conventional transverse width of PA cephalograms. RESULTS Statistically significant differences in maxillary and mandibular bone widths were detected at different levels and sites. Bone widths were significantly increased from the alveolar crest toward the basal bone in the maxillary molar and mandibular second premolar and molar areas. A statistically significant correlation was only found between CBCT images and PA cephalograms for maxillomandibular width at the first molar area. CONCLUSION The results of this study suggested that three-dimensional assessment of maxillomandibular width is mandatory for the transverse analysis.
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Affiliation(s)
- Kyung-Min Lee
- Assistant Professor, Department of Orthodontics, School of Dentistry, Dental 4D Research Institute, Chonnam National University, Gwangju, Korea
| | - Hyeon-Shik Hwang
- Professor and Chairman, Department of Orthodontics, School of Dentistry, Dental Science Research Institute, Chonnam National University, Gwangju, Korea
| | - Jin-Hyoung Cho
- Associate Professor, Department of Orthodontics, School of Dentistry, Dental 4D Research Institute, Chonnam National University, Gwangju, Korea
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25
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Shibazaki-Yorozuya R, Yamada A, Nagata S, Ueda K, Miller AJ, Maki K. Three-dimensional longitudinal changes in craniofacial growth in untreated hemifacial microsomia patients with cone-beam computed tomography. Am J Orthod Dentofacial Orthop 2014; 145:579-94. [PMID: 24785922 DOI: 10.1016/j.ajodo.2013.09.015] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Revised: 09/01/2013] [Accepted: 09/01/2013] [Indexed: 10/25/2022]
Abstract
INTRODUCTION The purpose of this study was to evaluate the concept that the affected and contralateral sides do not grow at the same rate in patients with hemifacial microsomia. Changes in the cranial base, maxilla, mandible, and occlusal plane were evaluated on 3-dimensional images from cone-beam computed tomography data in untreated patients. METHODS Six patients were classified as having mandibular Pruzansky/Kaban type I, IIA, or IIB hemifacial microsomia. Cone-beam computed tomography (MercuRay; Hitachi, Tokyo, Japan) scans were taken before orthodontic treatment during both growth and postpuberty periods. RESULTS The cranial base as defined by the position of the mastoid process was in a different position between the affected and contralateral control sides. The nasomaxillary length or height was shorter on the affected side for all 6 patients with hemifacial microsomia regardless of its severity, and it grew less than on the contralateral control side in 5 of the 6 patients. The occlusal plane angle became more inclined in 4 of the 6 patients. The mandibular ramus was shorter on the affected side in all patients and grew less on the affected side in 5 of the 6 patients. The mandibular body grew slower, the same, or faster than on the control side. CONCLUSIONS The cranial base, position of the condyle, lengths of the condyle and ramus, and positions of the gonial angle and condyle can vary between the affected and contralateral control sides of patients with hemifacial microsomia, with the ramus and nasomaxillary length usually growing slower than they grow on the control side. These results suggest that many factors affect the growth rate of the craniofacial region and, specifically, the mandible in patients with hemifacial microsomia.
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Affiliation(s)
- Reiko Shibazaki-Yorozuya
- Assistant professor, Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan.
| | - Akira Yamada
- Lecturer, Department of Plastic and Reconstructive Surgery, Osaka Medical School, Osaka, Japan; visiting professor, World Craniofacial Foundation, Dallas, Tex
| | - Satoru Nagata
- Director, Nagata Microtia and Reconstructive Plastic Surgery Clinic, Saitama, Japan; visiting professor, Department of Plastic and Reconstructive Surgery, University of California Irvine School of Medicine, Irvine, Calif
| | - Kouichi Ueda
- Professor and chair, Department of Plastic and Reconstructive Surgery, Osaka Medical School, Osaka, Japan
| | - Arthur J Miller
- Professor, Division of Orthodontics, Department of Orofacial Sciences, School of Dentistry, University of California, San Francisco, Calif
| | - Koutaro Maki
- Professor and chair, Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan
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Fuyamada M, Shibata M, Nawa H, Yoshida K, Kise Y, Katsumata A, Ariji E, Goto S. Reproducibility of maxillofacial landmark identification on three-dimensional cone-beam computed tomography images of patients with mandibular prognathism: Comparative study of a tentative method and traditional cephalometric analysis. Angle Orthod 2014; 84:966-73. [PMID: 24745629 DOI: 10.2319/111313-836.1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
OBJECTIVE To clarify the reproducibility of a tentative method for identifying maxillofacial landmarks on three-dimensional (3D) images obtained with cone-beam computed tomography (CBCT) for dental use in patients with mandibular prognathism. Also, the influence of level of experience of dentists applying the method was investigated by dividing them into two groups according to experience. MATERIALS AND METHODS Dentists with less (group A) or more (group B) than 3 years of experience of cephalometry and 3D image manipulation analyzed CBCT data from 10 patients using two different landmark identification methods: method 1 used conventional cephalometric definitions and method 2 used detailed landmark identification definitions developed for each cross-sectional plane. The plotting of nine landmarks was performed twice, and 10 coordinate values were obtained for each landmark. To assess reproducibility, the 95% confidence ellipse method was used. RESULTS Comparative analysis showed that method 2 was highly reproducible. Group B subjects attained smaller ellipsoid volumes than group A subjects, regardless of the landmark identification method used. With method 1, except for condyle and coronoid process, all landmarks showed a higher level of reproducibility in group A subjects than in group B subjects. With method 2, however, five landmarks showed no differences between the methods. CONCLUSION The method proposed here may be highly reproducible regardless of the evaluators' experience.
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Affiliation(s)
- Mariko Fuyamada
- a Part-time Instructor, Department of Orthodontics, Aichi-Gakuin University School of Dentistry, Nagoya, Japan
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Evaluation of bone width lateral to the mandibular canal as an alternative approach for implant installation. IMPLANT DENT 2014; 22:97-101. [PMID: 23303270 DOI: 10.1097/id.0b013e31827e8640] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE The objective of the present study was to realize an indirect morphometric evaluation of bone thickness lateral to the mandibular canal. MATERIAL AND METHODS In 30 partially or totally edentulous dry jaws, the first and second molar areas were analyzed using computed tomography. RESULTS The findings indicated that 28.33% of the sites could be considered for the installation of a standard 3.75-mm-diameter implant laterally between the mandibular canal and its bony counterpart. CONCLUSION Implant installation in the posterior mandible region, lateral to the mandibular canal, is an alternative to more complex techniques, such as vertical ridge augmentation.
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Katayama K, Yamaguchi T, Sugiura M, Haga S, Maki K. Evaluation of mandibular volume using cone-beam computed tomography and correlation with cephalometric values. Angle Orthod 2013; 84:337-42. [PMID: 23985034 DOI: 10.2319/012913-87.1] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
OBJECTIVE To investigate the association between maxillofacial morphology and mandibular bone volume in patients with skeletal malocclusion. MATERIALS AND METHODS Subjects were 118 adult Japanese (58 males and 60 females). Skeletal malocclusion was classified, based on cephalometric analysis, into skeletal Classes I (-1° ≤ ANB < 4°), II (ANB ≥ 4°), and III (ANB < -1°). Using cone-beam computed tomography and three-dimensional image analysis software, the dental crowns and mandible were separated, with only the mandible extracted. This was then reconstructed as a three-dimensional model, from which the mandibular volume was measured. RESULTS No significant difference in mandibular volume was noted among skeletal Classes I, II, and III, nor was there any significant correlation between mandibular volume and the ANB, SNB, or mandibular plane angles. There was occasional and limited correlation between mandible volume and gonial angle and certain cephalometric distance parameters. CONCLUSION We conclude that proper understanding of the three-dimensional maxillofacial morphology requires not only cephalometric radiographic tracings but also high-resolution analysis of the mandibular area, width, and volume.
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Affiliation(s)
- Koshu Katayama
- a Graduate student, Department of Orthodontics, School of Dentistry, Showa University, Tokyo, Japan
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Wang RY, Han M, Liu H, Wang CL, Xian HH, Zhang L, Zhang SJ, Liu DX. Establishment of reference mandibular plane for anterior alveolar morphology evaluation using cone beam computed tomography. J Zhejiang Univ Sci B 2013; 13:942-7. [PMID: 23125087 DOI: 10.1631/jzus.b1200052] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
To propose a method of establishing the reference mandibular plane (MP), which could be reestablished according to the coordinates of the reference points, and then facilitate the assessment of anterior alveolar morphology using cone beam computed tomography (CBCT), sixty patients with bimaxillary protrusion were randomly selected and CBCT scans were taken. The CBCT scans were transferred to Materialism's interactive medical image control system 10.01 (MIMICS 10.01), and three dimensional models of the entire jaws were constructed. Reference points determining the reference MP were positioned in the coronal, axial, sagittal windows, and the points were exactly located by recording their coordinates in the interfaces of software. The reference MP provided high intra-observer reliability (Pearson's r 0.992 to 0.999), and inter-observer reliability (intra-class correlation coefficients (ICCs) 0.996 to 0.999).
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Affiliation(s)
- Rong-yang Wang
- Department of Orthodontics, Shandong Provincial Key Laboratory of Oral Biomedicine, Shandong University, Jinan 250012, China
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Katkar RA, Kummet C, Dawson D, Moreno Uribe L, Allareddy V, Finkelstein M, Ruprecht A. Comparison of observer reliability of three-dimensional cephalometric landmark identification on subject images from Galileos and i-CAT cone beam CT. Dentomaxillofac Radiol 2013; 42:20130059. [PMID: 23833319 DOI: 10.1259/dmfr.20130059] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVES Recently, there has been increasing interest in the use of cone beam CT (CBCT) for three-dimensional cephalometric analysis and craniofacial reconstruction in orthodontic and orthognathic surgical treatment planning. However, there is a need to redefine the cephalometric landmarks in three dimensional cephalometric analysis and to demonstrate the reproducibility of landmark identification on the type of CBCT machine being used. METHODS CBCT images of 20 subjects aged 15-25 years were selected, ten each from Galileos(®) (Sirona Dental Systems Inc., Bensheim, Germany) and Next Generation i-CAT(®) (Imaging Sciences International, Hatfield, PA). 2 observers located 18 landmarks on each subject twice using Dolphin-3D v. 11 software (Dolphin Imaging and Management Systems, Chatsworth, CA). Inter- and intraobserver reliability was assessed using Euclidean distances and linear mixed models. RESULTS Overall, the intra- and interobserver reliability was excellent for both machines. The landmarks Gonion, Nasion, Orbitale and Anterior Nasal Spine (ANS) showed the greatest median Euclidean distances for both intra- and interobserver measurements. There were significant observer effects in the unified models for Sella, Menton and all six dental landmarks. For Sella, the distances between the measures were significantly smaller (more closely spaced) on the i-CAT machine than on the Galileos in both intra- and interobserver measurements. CONCLUSIONS The intra- and interobserver reliability was excellent for both machines. Some of the landmarks were not as reproducible as others. Which machine produced the highest reliability depended on the landmark considered.
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Affiliation(s)
- R A Katkar
- Department of Oral and Maxillofacial Radiology, University of Florida, College of Dentistry, Gainesville, FL
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Crowhurst JA, Campbell D, Whitby M, Pathmanathan P. Novel utilization of 3D technology and the hybrid operating theatre: Peri‐operative assessment of posterior sterno‐clavicular dislocation using cone beam
CT. J Med Radiat Sci 2013; 60:67-70. [PMID: 26229610 PMCID: PMC4175802 DOI: 10.1002/jmrs.15] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Accepted: 04/24/2013] [Indexed: 11/20/2022] Open
Abstract
A patient with a medial and posterior dislocation of the right sterno-clavicular (SC) joint and displacement of the trachea and brachiocephalic artery by the medial head of the clavicle underwent general anaesthetic in the operating theatre for an open reduction procedure. The surgeon initially attempted a closed reduction, but this required imaging to check SC alignment. The patient was transferred to an adjacent hybrid operating theatre for imaging. Cone beam computed tomography (CBCT) was performed, which successfully demonstrated a significant reduction in the dislocation of the SC joint. The trachea and brachiocephalic artery were no longer compressed or displaced. This case study demonstrates an alternative to the patient being transferred to the medical imaging department for multi-slice CT. It also describes a novel use of the hybrid operating theatre and its CBCT capabilities.
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Affiliation(s)
| | - Douglas Campbell
- The Prince Charles Hospital Rode Road Chermside Queensland Australia
| | - Mark Whitby
- The Prince Charles Hospital Rode Road Chermside Queensland Australia
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Brunetto M, Andriani JDSP, Ribeiro GLU, Locks A, Correa M, Correa LR. Three-dimensional assessment of buccal alveolar bone after rapid and slow maxillary expansion: A clinical trial study. Am J Orthod Dentofacial Orthop 2013; 143:633-44. [DOI: 10.1016/j.ajodo.2012.12.008] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2012] [Revised: 12/01/2012] [Accepted: 12/01/2012] [Indexed: 10/26/2022]
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Stress analysis in single molar tooth. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2013; 33:691-8. [PMID: 25427475 DOI: 10.1016/j.msec.2012.10.020] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2012] [Revised: 09/15/2012] [Accepted: 10/28/2012] [Indexed: 10/27/2022]
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Bechara B, McMahan CA, Moore WS, Noujeim M, Geha H. Contrast-to-noise ratio with different large volumes in a cone-beam computerized tomography machine: An in vitro study. Oral Surg Oral Med Oral Pathol Oral Radiol 2012; 114:658-65. [DOI: 10.1016/j.oooo.2012.08.436] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2011] [Revised: 04/30/2012] [Accepted: 08/07/2012] [Indexed: 11/30/2022]
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Yodthong N, Charoemratrote C, Leethanakul C. Factors related to alveolar bone thickness during upper incisor retraction. Angle Orthod 2012; 83:394-401. [PMID: 23043245 DOI: 10.2319/062912-534.1] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
OBJECTIVE To investigate the factors related to changes in alveolar bone thickness during upper incisor retraction. MATERIALS AND METHODS The subjects consisted of 23 ongoing orthodontic patients (mean age 20.4 ± 2.7 years) whose upper incisors were bound for retraction. Changes in alveolar bone thickness in the retracted area were assessed using preretraction (T0) and postretraction (T1) cone-beam computed tomography images. Labial bone thickness (LBT), palatal bone thickness (PBT), and total bone thickness (TBT) were assessed at the crestal, midroot, and apical levels of the retracted incisors. Paired t-tests were used to compare T0 and T1 bone thickness measurements. Spearman's rank correlation analysis was performed to determine the relationship of changes in alveolar bone thickness with the rate of tooth movement, change in inclination, initial alveolar bone thickness, and the extent of intrusion. RESULTS As the upper incisors were retracted, the LBT at the crestal level and TBT at the apical level significantly increased (P < .005). Changes in alveolar bone thickness were significantly associated with the rate of tooth movement, change in inclination, and extent of intrusion (P < .05) but not initial alveolar bone thickness (P > .05). CONCLUSION Rate of tooth movement, change in inclination, and extent of intrusion are significant factors that may influence alveolar bone thickness during upper incisor retraction. These factors must be carefully monitored to avoid the undesirable thickening of alveolar bone.
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Affiliation(s)
- Nuengrutai Yodthong
- Orthodontic Section, Department of Preventive Dentistry, Faculty of Dentistry, Prince of Songkla University, Hat Yai, Songkhla, Thailand
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Miner RM, Al Qabandi S, Rigali PH, Will LA. Cone-beam computed tomography transverse analysis. Part I: Normative data. Am J Orthod Dentofacial Orthop 2012; 142:300-7. [DOI: 10.1016/j.ajodo.2012.04.014] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2010] [Revised: 04/01/2012] [Accepted: 04/01/2012] [Indexed: 11/29/2022]
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Batista WOG, Navarro MVT, Maia AF. Effective doses in panoramic images from conventional and CBCT equipment. RADIATION PROTECTION DOSIMETRY 2012; 151:67-75. [PMID: 22171097 DOI: 10.1093/rpd/ncr454] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Dental radiology is being extensively used especially after the consolidation of the dental implant technique. Although dental radiology has always been regarded as a low-dose technique, this scenario has changed with the introduction of volumetric techniques and consequent changes that have resulted from the use of the new technique. To compare dose values related to the use of different technologies used in the acquisition of dental panoramic images, the effective dose associated with this image technique was calculated using two different conversion factors for kerma-area product, P(KA), in the effective dose. Twenty-four pieces of equipment were evaluated and distributed into three categories: (1) 19 units of conventional equipment, (2) 3-cone beam computed tomography equipment (CBCT) which has a specific sensor to obtain panoramic images and (3) 2 items of CBCT equipment which only have sensors for volumetric acquisition, and the obtainment of panoramic images is through software reconstruction. The results show values of PKA and effective dose are higher for devices using digital image receptors. It is concluded that optimisation procedures and critical analysis should always be applied when adopting new technologies.
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Affiliation(s)
- W O G Batista
- Federal Institute of Education, Science and Technology of Bahia, Rua Emídio Santos, Salvador, Bahia, Brazil.
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Kim M, Huh KH, Yi WJ, Heo MS, Lee SS, Choi SC. Evaluation of accuracy of 3D reconstruction images using multi-detector CT and cone-beam CT. Imaging Sci Dent 2012; 42:25-33. [PMID: 22474645 PMCID: PMC3314834 DOI: 10.5624/isd.2012.42.1.25] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Revised: 10/27/2011] [Accepted: 11/08/2011] [Indexed: 11/18/2022] Open
Abstract
PURPOSE This study was performed to determine the accuracy of linear measurements on three-dimensional (3D) images using multi-detector computed tomography (MDCT) and cone-beam computed tomography (CBCT). MATERIALS AND METHODS MDCT and CBCT were performed using 24 dry skulls. Twenty-one measurements were taken on the dry skulls using digital caliper. Both types of CT data were imported into OnDemand software and identification of landmarks on the 3D surface rendering images and calculation of linear measurements were performed. Reproducibility of the measurements was assessed using repeated measures ANOVA and ICC, and the measurements were statistically compared using a Student t-test. RESULTS All assessments under the direct measurement and image-based measurements on the 3D CT surface rendering images using MDCT and CBCT showed no statistically difference under the ICC examination. The measurements showed no differences between the direct measurements of dry skull and the image-based measurements on the 3D CT surface rendering images (P>.05). CONCLUSION Three-dimensional reconstructed surface rendering images using MDCT and CBCT would be appropriate for 3D measurements.
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Affiliation(s)
- Mija Kim
- Department of Orthodontics, Hangang Sacred Heart Hospital, Graduate School of Clinical Dentistry, Hallym University, Seoul, Korea
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Gamble J, Lagravère MO, Major PW, Heo G. New statistical method to analyze three-dimensional landmark configurations obtained with cone-beam CT: basic features and clinical application for rapid maxillary expansion. Korean J Radiol 2012; 13:126-35. [PMID: 22438679 PMCID: PMC3303895 DOI: 10.3348/kjr.2012.13.2.126] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2010] [Accepted: 10/05/2011] [Indexed: 11/15/2022] Open
Abstract
Objective To describe a statistical method of three-dimensional landmark configuration data and apply it to an orthodontic data set comparing two types of rapid maxillary expansion (RME) treatments. Materials and Methods Landmark configurations obtained from cone beam CT scans were used to represent patients in two types (please describe what were two types) of RME groups and a control group over four time points. A method using tools from persistent homology and dimensionality reduction is presented and used to identify variability between the subjects. Results The analysis was in agreement with previous results using conventional methods, which found significant differences between treatment groups and the control, but no distinction between the types of treatment. Additionally, it was found that second molar eruption varied considerably between the subjects, and this has not been evaluated in previous analyses. Conclusion This method of analysis allows entire configurations to be considered as a whole, and does not require specific inter-landmark distances or angles to be selected. Sources of variability present themselves, without having to be individually sought after. This method is suggested as an additional tool for the analysis of landmark configuration data.
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Affiliation(s)
- Jennifer Gamble
- Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Canada
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Shibata M, Nawa H, Kise Y, Fuyamada M, Yoshida K, Katsumata A, Ariji E, Goto S. Reproducibility of three-dimensional coordinate systems based on craniofacial landmarks: a tentative evaluation of four systems created on images obtained by cone-beam computed tomography with a large field of view. Angle Orthod 2012; 82:776-84. [PMID: 22348241 DOI: 10.2319/102511-662.1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
OBJECTIVES To propose a method for evaluating the reproducibility of anatomical coordinate systems based on craniofacial skeletal landmarks and to tentatively evaluate four systems created on preoperative cone-beam computed tomography (CBCT) data obtained from mandibular prognathism patients in order to confirm the utility for actual patients' data. MATERIALS AND METHODS In three-dimensional images of 10 patients obtained by a CBCT with a large field of view, six dentists set four coordinate systems that were created in different ways, twice by plotting some landmarks situated in the superior portion of the maxillofacial skeletons. The 95% confidence ellipse of six objective landmarks related to the jaw and teeth (upper incisor, left upper first molar, lower incisor, left lower first molar, menton, and left gonion) were three-dimensionally drawn for each coordinate system. The ellipsoid volume was calculated to evaluate the reproducibility of the coordinate systems. RESULTS The reproducibility could be evaluated for each coordinate system using the method proposed. The coordinate systems that were created by landmarks situated at greater distances from each other showed relatively small ellipsoid volume in comparison to those with shorter distances between landmarks. CONCLUSION Anatomical coordinate systems with larger distances between the landmarks used were stable when landmarks related to the jaw and teeth were assigned as objective landmarks. The method proposed here was effective in terms of the reproducibility evaluation of a coordinate system.
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Affiliation(s)
- Momoko Shibata
- Department of Orthodontics, Aichi-Gakuin University School of Dentistry, Nagoya, Japan.
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Chang ZC, Hu FC, Lai E, Yao CC, Chen MH, Chen YJ. Landmark identification errors on cone-beam computed tomography-derived cephalograms and conventional digital cephalograms. Am J Orthod Dentofacial Orthop 2012; 140:e289-97. [PMID: 22133963 DOI: 10.1016/j.ajodo.2011.06.024] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2010] [Revised: 06/01/2011] [Accepted: 06/01/2011] [Indexed: 01/13/2023]
Abstract
INTRODUCTION In this study, we investigated the landmark identification errors on cone-beam computed tomography (CBCT)-derived cephalograms and conventional digital cephalograms. METHODS Twenty patients who had both a CBCT-derived cephalogram and a conventional digital cephalogram were recruited. Twenty commonly used lateral cephalometric landmarks and 2 fiducial points were identified on each cephalogram by 11 observers at 2 time points. The mean positions of the landmarks identified by all observers were used as the best estimate to calculate the landmark identification errors. In addition to univariate analysis, regression analysis of landmark identification errors was conducted for identifying the predicting variables of the observed landmark identification errors. To properly handle the multilayer correlations among the clustered observations, a marginal multiple linear regression model was fitted to our correlated data by using the well-known generalized estimating equations method. In addition to image modality, many variables potentially affecting landmark identification errors were considered, including location and characteristics of the landmark, seniority of the observer, and patient information (sex, age, metallic dental restorations, and facial asymmetry). RESULTS Image modality was not the significant variable in the final generalized estimating equations model. The regression coefficient estimates of the significant landmarks for the overall identification error ranged from -0.99 (Or) to 1.42 mm (Ba). The difficulty of identifying landmarks on structural images with multiple overlapping--eg, Or, U1R, L1R, Po, Ba, UMo, and LMo--increased the identification error by 1.17 mm. In the CBCT modality, the identification errors significantly decreased at Ba (-0.76 mm). CONCLUSIONS The overall landmark identification errors on CBCT-derived cephalograms were comparable to those on conventional digital cephalograms, and Ba was more reliable on CBCT-derived cephalograms.
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Affiliation(s)
- Zwei-Chieng Chang
- Department of Dentistry, National Taiwan University Hospital, Taipei, Taiwan
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Bechara B, A. McMahan C, S. Moore W, Noujeim M, Geha H, B. Teixeira F. Contrast-to-noise ratio difference in small field of view cone beam computed tomography machines. J Oral Sci 2012; 54:227-32. [DOI: 10.2334/josnusd.54.227] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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Hernández-Alfaro F, Guijarro-Martínez R, Mareque-Bueno J. Effect of Mono- and Bimaxillary Advancement on Pharyngeal Airway Volume: Cone-Beam Computed Tomography Evaluation. J Oral Maxillofac Surg 2011; 69:e395-400. [DOI: 10.1016/j.joms.2011.02.138] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2010] [Revised: 02/08/2011] [Accepted: 02/20/2011] [Indexed: 11/24/2022]
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FURUYA J, TAMADA Y, SUZUKI T. Effect of mandibular position on three-dimensional shape of the oropharynx in seated posture. J Oral Rehabil 2011; 39:277-84. [DOI: 10.1111/j.1365-2842.2011.02263.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Lagravère MO, Gordon JM, Flores-Mir C, Carey J, Heo G, Major PW. Cranial base foramen location accuracy and reliability in cone-beam computerized tomography. Am J Orthod Dentofacial Orthop 2011; 139:e203-10. [PMID: 21392663 DOI: 10.1016/j.ajodo.2009.06.027] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2008] [Revised: 06/01/2009] [Accepted: 06/01/2009] [Indexed: 11/29/2022]
Abstract
INTRODUCTION The purpose of this study was to evaluate the reliability and accuracy in locating several different foramina in the cranial base by using cone-beam computerized tomography (CBCT) images for future use in establishing reference coordinate systems. METHODS CBCT images from 10 dry skulls were taken with and without the foramina ovale, spinosum, and rotundum, and the hypoglossal canals filled with radiopaque gutta-percha (gold standard). Three evaluators identified the foramen landmarks in the CBCT images without gutta-percha. Mean differences and main researcher intraexaminer and interexaminer reliability were measured by using intraclass correlation coefficients for all landmark coordinates. Descriptive statistics were calculated with respect to the landmark coordinates and distances to the reference points. RESULTS Intraexaminer and interexaminer reliability values for the x-, y-, and z-coordinates for all landmarks were greater than 0.9 with the exception of 4 (of 72) points that still had acceptable interexaminer reliability (>0.75). Mean measurement error differences obtained in the principal investigator's trials were primarily less than 0.5 mm. When comparing the mean distance differences of the same examiner and between the 3 examiners with the gold standard, the highest difference obtained was 1.3 mm. CONCLUSIONS Foramina spinosum, ovale, and rotundum, and the hypoglossal canal all provided high intraexaminer reliability and accuracy, and can be considered acceptable landmarks to use in establishing reference coordinate systems for future 3-dimensional superimposition analysis.
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Affiliation(s)
- Manuel O Lagravère
- Orthodontic Graduate Program, Department of Dentistry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada.
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Fuyamada M, Nawa H, Shibata M, Yoshida K, Kise Y, Katsumata A, Ariji E, Goto S. Reproducibility of landmark identification in the jaw and teeth on 3-dimensional cone-beam computed tomography images. Angle Orthod 2011; 81:843-9. [PMID: 21568647 DOI: 10.2319/010711-5.1] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
OBJECTIVE To compare the reproducibility of landmark identification on three-dimensional (3D) cone-beam computed tomography (CBCT) images between procedures based on traditional cephalometric definitions (procedure 1) and those tentatively proposed for 3D images (procedure 2). MATERIALS AND METHODS A phantom with embedded dried human skull was scanned using CBCT. The acquired volume data were transferred to a personal computer, and 3D images were reconstructed. Eighteen dentists plotted nine landmarks related to the jaws and teeth four times: menton (Me), pogonion (Po), upper-1 (U1), lower-1 (L1), left upper-6 (U6), left lower-6 (L6), gonion (Go), condyle (Cd), and coronoid process (Cp). The plotting reliabilities of the two procedures were compared by calculating standard deviations (SDs) in three components (x, y, and z) of coordinates and volumes of 95% confidence ellipsoid. RESULTS All 27 SDs for procedure 2 were less than 1 mm, and only five of them exceeded 0.5 mm. The variations were significantly different between the two procedures, and the SDs of procedure 2 were smaller than those of procedure 1 in 21 components of coordinates. The ellipsoid volumes were also smaller for procedure 2 than procedure 1, although a significant difference was not found. CONCLUSIONS Definitions determined strictly on each three sectional images, such as for procedure 2, were required for sufficient reliability in identifying the landmark related to the jaws and teeth.
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Affiliation(s)
- Mariko Fuyamada
- Department of Orthodontics, Aichi-Gakuin University School of Dentistry, Nagoya, Japan
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Wong RWK, Chau ACM, Hägg U. 3D CBCT McNamara's cephalometric analysis in an adult southern Chinese population. Int J Oral Maxillofac Surg 2011; 40:920-5. [PMID: 21511439 DOI: 10.1016/j.ijom.2011.03.011] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2010] [Revised: 02/22/2011] [Accepted: 03/18/2011] [Indexed: 11/16/2022]
Abstract
Preliminary results were determined for a database on 3-dimensional (3D) cephalometrics using McNamara's analysis in an adult southern Chinese population based on cone-beam computerized tomography (CBCT). 3D dentoskeletal morphology was assessed from CBCTs from 80 (39 males; 41 females; 21-30 years) consecutive adult southern Chinese without gross craniofacial deformity or asymmetry, adopting 16 variables from McNamara's cephalometric method. For variables in relation to maxilla to cranial base, mandible to cranial base and dentition, there were no significant differences between males and females. For variables in relation to mandible to maxilla, 8 of 11 showed significant differences between males and females: Cd(L)-Gn (♂: 127.65 mm; ♀: 119.56 mm, P<0.01), Cd(R)-Gn (♂: 127.85 mm; ♀: 119.94 mm, P<0.01), Cd(L)-A (♂: 99.38 mm; ♀: 94.18 mm, P<0.01), Cd(R)-A (♂: 93.93 mm; ♀: 94.99 mm, P<0.01), MxMD-DF(L) (♂: 28.26 mm; ♀: 25.40 mm, P<0.05), MxMD-DF(R) (♂: 27.74 mm; ♀: 24.02 mm, P<0.05), ANS-Me (♂: 71.09 mm; ♀: 65.84 mm, P<0.01), and MD-P(L) (♂: 22.85°; ♀: 25.25°, P<0.05). The method errors did not exceed 0.5 mm for any variables. A preliminary CBCT cephalometric database of the population was created. The significant sexual differences in the 3D McNamara's analysis indicate that gender specific data should be made available. The sample size should be increased to create a more representative database.
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Affiliation(s)
- R W K Wong
- Orthodontics, University of Hong Kong, Hong Kong.
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Gauthier C, Voyer R, Paquette M, Rompré P, Papadakis A. Periodontal effects of surgically assisted rapid palatal expansion evaluated clinically and with cone-beam computerized tomography: 6-month preliminary results. Am J Orthod Dentofacial Orthop 2011; 139:S117-28. [PMID: 21435529 DOI: 10.1016/j.ajodo.2010.06.022] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2009] [Revised: 06/01/2010] [Accepted: 06/01/2010] [Indexed: 10/18/2022]
Abstract
INTRODUCTION Transverse maxillary deficiency is frequently observed in patients who seek orthodontic treatment. In skeletally mature patients, transverse maxillary deficiency can be treated with surgically assisted rapid palatal expansion (SARPE). Forces delivered by the expander produce areas of compression in the periodontal ligament, which could lead to alveolar bone resorption and possible changes in the attachment level. The aim of this prospective clinical study was to evaluate the periodontal effects of SARPE by means of a complete clinical evaluation and cone-beam computerized tomography (CBCT) evaluation. METHODS The sample included 14 patients (5 males, 9 females), with a mean age of 23.0 ± 1.9 years (range: 16.4 to 39.7 years). All patients were treated using a bonded Hyrax-type expander, and the mean expansion was 9.82 mm (7.5 to 12.0 mm). All patients had a 1-year retention period. CBCT scans were taken, and periodontal charts were completed at time points T0 (initial) and T1 (6 months after expansion). RESULTS AND DISCUSSION SARPE seemed to have little detrimental clinical effects on the periodontium. Radiographic data demonstrated statistically significant changes: a significant decrease in the buccal alveolar bone thickness on most teeth, a significant increase in the palatal alveolar bone thickness on most teeth, a decrease in the buccal alveolar crest level of all canines and posterior teeth, and a tendency toward a decrease in the interproximal alveolar crest level on the mesial aspect of both central incisors. CONCLUSIONS SARPE seems to have little detrimental effects on the periodontium clinically. However, radiographic data demonstrated some statistically significant changes, which could eventually have a significant clinical impact on the periodontium.
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Affiliation(s)
- Chantal Gauthier
- Faculté de médecine dentaire, Université de Montréal, Montréal, Québec, Canada.
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Yitschaky O, Redlich M, Abed Y, Faerman M, Casap N, Hiller N. Comparison of common hard tissue cephalometric measurements between computed tomography 3D reconstruction and conventional 2D cephalometric images. Angle Orthod 2011; 81:11-16. [PMID: 20936949 DOI: 10.2319/031710-157.1] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
OBJECTIVE To compare cephalostat two-dimensional (2D) measurements to 3D computed tomography (CT) measurements in order to determine the compatibility of CT landmarks identification for orthodontic purposes. MATERIALS AND METHODS Ten human skulls were x-rayed in conventional lateral cephalogram and then scanned with spiral CT. Twenty-eight linear and angular cephalometric measurements were registered on the 2D lateral cephalogram and compared to the same measurement on the 3D CT scan. Significance of the results was determined by t-test for paired differences (P < .05). RESULTS No difference was found between 2D and 3D images for linear or ratio measurements. As for the angular cephalometric measurements, only the sella turcica dependent measurements, showed significant difference between 2D and 3D. CONCLUSIONS The compatibility of using most of the common orthodontic examined cephalometric measurements on 3D volume rendered image was proven except for the angular measurements that included sella anatomic landmark.
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Affiliation(s)
- Oded Yitschaky
- Department of Orthodontics, Hebrew University, Jerusalem, Israel
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