Comparison of conventional and digital radiography in evaluation of the bone lesions healing process in dog jaws

Jaw bone defects are the origin of many complications for patients, and completebone healing has a special importance. Histological examination can be regarded as the [gold standard]. However, noninvasive diagnosis techniques are needed for clinical application. The aim of this study was to compare digital and conventional radiography for detection of bone healing. In this study, premolar teeth of 4 dogs were extracted. 5.5mm bone defect was created in each quadrant of the jaw bone Three months after healing of the extraction sites. Digital and conventional radiography was performed at 15, 30, 45 and 60 days after surgery. At every stage, bone specimens were removed and studied with histomorphometric procedures. At all stages, bone defect density was determined by conventional and digital radiography and compared with the percentage of bone formation determined by histomorphometry. The data were analyzed using descriptive analysis variance test for repeated data and paired t-test using SPSS software. At all stages, the differences between both radiographic methods and histomorphometry were statistically significant. At days 15 and 60, a statistically significant difference was seen between digital and conventional radiography. The differences between digital and conventional radiography at days 30 and 45 were not statistically significant. Digital radiography showed changes more clearly in the early stages of bone formation [day 15] and at later stages [day 60]

Analysis of dentists' knowledge of x-ray protection and radiobiology in Isfahan

Along with the increasing development of X-ray diagnostic applications, the individuals dealing in any manner with this ray are obliged to be appropriately trained for the adverse effects of and protection against, X-ray and get fully acquainted with the same. A group dealing with X-ray are the dentists. This study generally aims at surveying the level of Isfahan city dentists' knowledge of X-ray protection and radiobiology. We initially gained a permit from the Province Deputy of Treatment and Medicine and then referred at random to 210 dentistry offices to distribute prearranged questionnaires to the dentists so that they complete them in our presence. We thus assessed: their knowledge of protection for patients, radiographers' work environment andX-ray radiobiology. The distribution of relative frequency of the dentists under study in connection with their knowledge of environmental protection was respectively [good], [average], [poor] and [very good]. The same distribution regarding protection for patients, radiographers andradiobiology was respectively [good], [average], [very good] and [poor].On total, regarding the level of protection and radiobiology knowledge, 67.6 % of the dentists lay in the [good], 21.9% in the [average], 10% in the [very good] and 0.5% in the [poor]groups. 126 out of 210 offices were equipped with radiography machine and the mean knowledge score of the equipped [centres] dentist was 61.5, whereas that of the unequipped dentists was 51.76. Regarding the T.test results, p value < 0.05, a statistically significant difference exists between the above mentioned 2 groups, i.e., the mean knowledge score of the dentists equipped with radiography machine regarding protection and X-ray radiobiology is higher than that of the unequipped dentists

Localization of the maxillary unerupted canine with a single panoramic radiograph

This study aims at developing a reliable method for the localization of the maxillary unerupted canine with a single panoramic radiograph.. A total of 45 panoramic radiographs including 56 maxillary unerupted canines were evaluated. The ratio of the mesiodistal width of the unerupted canine to that of the homo-lateral incisor canine [canine-incisor index = CII] and the ratio of the width of the unerupted canine to that of the contra-lateral canine [canine- canine index = CCI]. Unerupted canine were calculated in patients with unilateral unerupted canine. The crown height of each unerupted canine was classified into 3, apical, middle and coronal positions in the vertical plane relative to the adjacent incisor. All of the unerpted 56 teeth were then operated and precisely localized. The results from the analysis of the ratios obtained showed an overlap in the range of CII buccally [1.06-1.46] and palatally [1.12-1.53] teeth, the crown of which were apical to the adjacent tooth root, whereas the unerupted teeth with coronal and middle crowns showed a significant difference in the labial [0.94-1.12] and palatal CII [1.16-1.33] and labial [0.81-1.15] and palatal [1.16-1.33] CCI. It can be concluded from the above mentioned findings that, if the vertical factor and CII are applied simultaneously, panoramic radiography can be a useful indicator for the localization of the maxillary unerupted canine