AIM: To gather existing radiographic classifications of mandibular canals branching, considering the criteria on which these were based.METHODS: The search for studies on mandibular canals based on imaging exams inclu...AIM: To gather existing radiographic classifications of mandibular canals branching, considering the criteria on which these were based.METHODS: The search for studies on mandibular canals based on imaging exams included literature reviews, epidemiological studies of prevalence, descriptive studies, or case reports. An electronic search in the MEDLINE(Ovid SP), Pub Med, EMBASE(Ovid SP), Web of Science(Thompson Reuters), and Scopus(Elsevier) databases was performed, as well as a manual evaluation of the references of the selected articles. Combinations of key words were placed in each database. No restrictions were imposed regarding the year of publication or language. References collected in duplicate were removed by the authors. A table was drawn up, containing the included studies and respective interest data.RESULTS: Six classifications of mandibular canals branching were selected for the present literature review. Four were based on two-dimensional radiographic exams, and two were performed based on threedimensional tomographic exams. Three-dimensional classifications were determined based on the analysis found in the least number of exams, comparatively to two-dimensional studies. The prevalence of mandibular canal branching varied from 0% to 38.75% in the works based on two-dimensional exams, while those found inthree-dimensional exams ranged from 15.6% to 65%. The studies were mostly referred to branches that began in the mandibular ramus. Just one classification considered the branches that began in the mandibular body region.CONCLUSION: Three-dimensional exams appear to be the best method to view mandibular canal branching. Further studies are warranted to determine its true prevalence and questions concerning to associations.展开更多
The cementoblastoma is a very rare odontogenic neoplasm characterised by the formation of cementum-like tissue in connection with the root of a tooth. An 18-year-old boy was referred to the Clinic of Oral Pathology of...The cementoblastoma is a very rare odontogenic neoplasm characterised by the formation of cementum-like tissue in connection with the root of a tooth. An 18-year-old boy was referred to the Clinic of Oral Pathology of the School of Dentistry, Universidade Federal de Minas Gerais, Brazil, complaining of an irradiating, itching pain from the region of the lower right first molar. He reported that the symptoms began three months prior, with a gradual increase in intensity during this period. The pain episodes were of short duration, with characteristics of toothache originating from the pulp. Upon intra-oral clinical examination, an open bite and slight increase in volume at the buccal alveolar region of the lower right first molar was observed. He also reported palpation and percussion pain symptoms in this region. Electrical, heat and cold pulp vitality tests were performed, and the tooth was vital. Periapical and panoramic radiographs showed radiolucent images with diffuse, poorly defined borders at the mesial root periapex extending to the interradicular region suggesting an inflammatory periapical lesion. In this early presentation, the three-dimensional image was fundamental to the final diagnosis of cementoblastoma.展开更多
Background: Dental radiology had helpful assistant in the diagnosis and treatment of oral diseases. Dentists in their practice have to access benefits of dental oral radiographs against its hazards. They must aware fr...Background: Dental radiology had helpful assistant in the diagnosis and treatment of oral diseases. Dentists in their practice have to access benefits of dental oral radiographs against its hazards. They must aware from new radiation protection techniques and radiation dosage which daily receive. Present study was performed for radiation protection awareness in dentists of Yazd city and their knowledge about recent lowering radiation techniques. Materials & Methods: Present cross sectional study was performed on 102 medical dentists of Yazd city. Our study samples were participated in one Continues Medical Educations (CME) session. Knowledge assessment of study medical dentists was gathered with questionnaire which was given to study participants during CME session. Results: Eighty nine percent of dentists had poor and 11% had moderate awareness about radiation protection techniques. There was no significant difference between mean of knowledge scores among study participants according their age groups, job experiences and genders. Conclusion: The knowledge of dentists about radiation protection techniques was very poor and they should implement recent and appropriate radiation protection techniques and guidelines.展开更多
AIM: To identify standards, how entities of dental status are assessed and reported from full-arch radiographs of adults. METHODS: A Pub Med(Medline) search was performed in November 2011. Literature had to report at ...AIM: To identify standards, how entities of dental status are assessed and reported from full-arch radiographs of adults. METHODS: A Pub Med(Medline) search was performed in November 2011. Literature had to report at least one out of four defined entities using radiographs:number of teeth or implants; caries, fillings or restorations; root-canal fillings and apical health; alveolar bone level. Cohorts included to the study had to be of adult age. Methods of radiographic assessment were noted and checked for the later mode of report in text, tables or diagrams. For comparability, the encountered modeof report was operationalized to a logical expression.RESULTS: Thirty-seven out of 199 articles were evaluated via full-text review. Only one article reported all four entities. Eight articles reported at the maximum 3 comparable entities. However, comparability is impeded because of the usage of absolute or relative frequency, mean or median values as well as grouping. Furthermore the methods of assessment were different or not described sufficiently. Consequently, established sum scores turned out to be highly questionable, too. The amount of missing data within all studies remained unclear. It is even so remissed to mention supernumerary and aplased teeth as well as the count of third molars.CONCLUSION: Data about dental findings from radiographs is, if at all possible, only comparable with serious limitations. A standardization of both, assessing and reporting entities of dental status from radiographs is missing and has to be established within a report guideline.展开更多
In dental panoramic images, the information on physical changes of alveolar bone or jaw bone is very important to diagnose several diseases. To detect such change, it is useful to compare two panoramic x-ray images ac...In dental panoramic images, the information on physical changes of alveolar bone or jaw bone is very important to diagnose several diseases. To detect such change, it is useful to compare two panoramic x-ray images acquired at different times. These two images are usually acquired with different conditions in terms of the positioning of the dental arch, and thus these images can be impaired from some geometrical changes related to the scale of the panoramic images and deformation of the teeth and jaw bones. As a result of this, it is very hard to make an accurate registration. To cope with this issue, we developed a dedicated image registration method to match these two images by a newly introduced non-rigid transformation method and registration method using the cross-correlation of localized regions. We evaluated our proposed method with several sets of two images acquired with different geometrical conditions. The material evaluated in this study was a skull phantom. The results of these experiments showed the validity and intrinsic ability of our proposed method in clinical examinations.展开更多
文摘AIM: To gather existing radiographic classifications of mandibular canals branching, considering the criteria on which these were based.METHODS: The search for studies on mandibular canals based on imaging exams included literature reviews, epidemiological studies of prevalence, descriptive studies, or case reports. An electronic search in the MEDLINE(Ovid SP), Pub Med, EMBASE(Ovid SP), Web of Science(Thompson Reuters), and Scopus(Elsevier) databases was performed, as well as a manual evaluation of the references of the selected articles. Combinations of key words were placed in each database. No restrictions were imposed regarding the year of publication or language. References collected in duplicate were removed by the authors. A table was drawn up, containing the included studies and respective interest data.RESULTS: Six classifications of mandibular canals branching were selected for the present literature review. Four were based on two-dimensional radiographic exams, and two were performed based on threedimensional tomographic exams. Three-dimensional classifications were determined based on the analysis found in the least number of exams, comparatively to two-dimensional studies. The prevalence of mandibular canal branching varied from 0% to 38.75% in the works based on two-dimensional exams, while those found inthree-dimensional exams ranged from 15.6% to 65%. The studies were mostly referred to branches that began in the mandibular ramus. Just one classification considered the branches that began in the mandibular body region.CONCLUSION: Three-dimensional exams appear to be the best method to view mandibular canal branching. Further studies are warranted to determine its true prevalence and questions concerning to associations.
文摘The cementoblastoma is a very rare odontogenic neoplasm characterised by the formation of cementum-like tissue in connection with the root of a tooth. An 18-year-old boy was referred to the Clinic of Oral Pathology of the School of Dentistry, Universidade Federal de Minas Gerais, Brazil, complaining of an irradiating, itching pain from the region of the lower right first molar. He reported that the symptoms began three months prior, with a gradual increase in intensity during this period. The pain episodes were of short duration, with characteristics of toothache originating from the pulp. Upon intra-oral clinical examination, an open bite and slight increase in volume at the buccal alveolar region of the lower right first molar was observed. He also reported palpation and percussion pain symptoms in this region. Electrical, heat and cold pulp vitality tests were performed, and the tooth was vital. Periapical and panoramic radiographs showed radiolucent images with diffuse, poorly defined borders at the mesial root periapex extending to the interradicular region suggesting an inflammatory periapical lesion. In this early presentation, the three-dimensional image was fundamental to the final diagnosis of cementoblastoma.
文摘Background: Dental radiology had helpful assistant in the diagnosis and treatment of oral diseases. Dentists in their practice have to access benefits of dental oral radiographs against its hazards. They must aware from new radiation protection techniques and radiation dosage which daily receive. Present study was performed for radiation protection awareness in dentists of Yazd city and their knowledge about recent lowering radiation techniques. Materials & Methods: Present cross sectional study was performed on 102 medical dentists of Yazd city. Our study samples were participated in one Continues Medical Educations (CME) session. Knowledge assessment of study medical dentists was gathered with questionnaire which was given to study participants during CME session. Results: Eighty nine percent of dentists had poor and 11% had moderate awareness about radiation protection techniques. There was no significant difference between mean of knowledge scores among study participants according their age groups, job experiences and genders. Conclusion: The knowledge of dentists about radiation protection techniques was very poor and they should implement recent and appropriate radiation protection techniques and guidelines.
基金Supported by The"Walter and Anna Koerner-Scholarship"as part of the Land of Baden-Wurttemberg’s Dentists Chamber(Stuttgart,Germany)within the cooperation of Tuebingen University and Peking University Dental Schoolsby Mrs.Barbara Welder of Dental Clinics Library at Eberhard-Karls-University(Tuebingen,Germany)by Lucas M Leister for English proofreading
文摘AIM: To identify standards, how entities of dental status are assessed and reported from full-arch radiographs of adults. METHODS: A Pub Med(Medline) search was performed in November 2011. Literature had to report at least one out of four defined entities using radiographs:number of teeth or implants; caries, fillings or restorations; root-canal fillings and apical health; alveolar bone level. Cohorts included to the study had to be of adult age. Methods of radiographic assessment were noted and checked for the later mode of report in text, tables or diagrams. For comparability, the encountered modeof report was operationalized to a logical expression.RESULTS: Thirty-seven out of 199 articles were evaluated via full-text review. Only one article reported all four entities. Eight articles reported at the maximum 3 comparable entities. However, comparability is impeded because of the usage of absolute or relative frequency, mean or median values as well as grouping. Furthermore the methods of assessment were different or not described sufficiently. Consequently, established sum scores turned out to be highly questionable, too. The amount of missing data within all studies remained unclear. It is even so remissed to mention supernumerary and aplased teeth as well as the count of third molars.CONCLUSION: Data about dental findings from radiographs is, if at all possible, only comparable with serious limitations. A standardization of both, assessing and reporting entities of dental status from radiographs is missing and has to be established within a report guideline.
文摘In dental panoramic images, the information on physical changes of alveolar bone or jaw bone is very important to diagnose several diseases. To detect such change, it is useful to compare two panoramic x-ray images acquired at different times. These two images are usually acquired with different conditions in terms of the positioning of the dental arch, and thus these images can be impaired from some geometrical changes related to the scale of the panoramic images and deformation of the teeth and jaw bones. As a result of this, it is very hard to make an accurate registration. To cope with this issue, we developed a dedicated image registration method to match these two images by a newly introduced non-rigid transformation method and registration method using the cross-correlation of localized regions. We evaluated our proposed method with several sets of two images acquired with different geometrical conditions. The material evaluated in this study was a skull phantom. The results of these experiments showed the validity and intrinsic ability of our proposed method in clinical examinations.
