RESUMO
Introduction: Cone beam computed tomography (CBCT) plays a significant role in studying the anatomical structures of the mandible. Aim: This retrospective study aimed to assess the role of CBCT at the pre-assessment stage of mandibular surgery. Materials and methods: A total of 250 CBCT images were collected. The inferior alveolar canal (IAC) and mental foramen (MF) were measured bilaterally to the mandibular teeth apexes, including molars, premolars, and canines, to the buccal, lingual cortical bone, and to the inferior border of the mandible. Results: There were no differences in the average number of extracted teeth between the right and left sides (P-value > 0.05, median = three teeth). It was noticed that the average measures of each point of the IAC and MF on the right side were closely matched to the similar point on the left side (P-value > 0.05). T-tests showed that there were differences between males and females on the M2 and M3 on the right side (P-value < 0.05) and on the M1, M2, and M3 on the left side (P-value < 0.05). Using one-way ANOVA tests, results showed that there were some differences in measures at P0 (F = 3.376, P-value = 0.003), P4 (F = 3.782, P-value = 0.001) on the right side, and at P3 (F = 5.620, P-value = 0.019) on the left side of the mandible. Conclusions: There were no significant differences in IAC and MF positions between the right and left sides. However, between males and females, MF measurements showed significant differences on some points on the right and left sides. Although the history of extracted teeth showed no statistically significant difference in the location of IAC and MF, the number of extracted teeth showed an effect in the IAC position on the right and left sides, but not with the MF.
RESUMO
AIM: Consumption of areca nut products among school going children has become very common social evil in some areas of Nepal especially adjoining the Indian subcontinent. The aim of this study was to assess the prevalence of areca nut chewing habit among high school children in Terai belt of Nepal. The use of areca nut has become indigenous in this part and is being used by itself and in various formulations. The regular use of areca nut has been recognized as being carcinogenic to humans. MATERIALS AND METHODS: Data on areca nut chewing habit among high school children was collected from 1359 students of age group 14-18 years from 13 schools of Parsa district of Nepal by random selection and the information was obtained from self administered questionnaire. RESULTS: The results from this study shows that the areca nut chewing habit is significant among the students of Parsa district (30.4%) and the frequency of chewing plain Supari was reported to be high (81.6%) followed by pan masala (10.4%) and gutkha (08.0%) and the habit increased with age. CONCLUSION: It is mandatory to motivate the children not to initiate the habit and to enable the adolescent children to realize the potential health risk of areca nut products.
RESUMO
Dentin dysplasia is a rare inherited autosomal dominant disorder characterized by rootless teeth. We hereby report a case of dentin dysplasia type 1b with typical radiographic findings: short and blunt roots, pulpal obliteration, horizontal/crescent shaped radiolucencies in pulp chambers, and multiple periapical radiolucencies. However, the present case did not show the autosomal dominant pattern of inheritance and the patient also exhibited concurrent dental fluorosis, transposition of 13 and 14, and multiple cusps in maxillary first molars. Moreover, on careful review of previously documented cases of radiographs of dentin dysplasia, the horizontal/crescent shaped radiolucencies in pulp chambers are a rare finding, which is characteristically seen in the present case.
