Investigating the Relationship between Personality Traits and Distress Tolerance with Mental Health and Academic Performance of Dental Students of Kashan University of Medical Sciences.

Background:Mental health and academic performance of students in the quality of dental education is very important to the learners in this field. Study aim:This study was designed to investigate the relationship between personality traits and distress tolerance with mental health and academic performance of dental students attending Kashan University of Medical Sciences, Iran. Methods:Seventy three dental students from Kashan University of Medical Sciences, Iran, participated in the present study. The sampling method was the census method. In this descriptive cross-sectional study, the Mental Health Questionnaire (GHQ), Distress Tolerance Questionnaire (DTS) and Five-Factor Personality Questionnaire (NEO) were used to assess the desired indicators and the total grade point average of students as a measure of their academic performance. Data was analyzed using Poisson regression estimators and descriptive statistics. Results:Study participants had a mean age of 22.42 years and 84.9% of them were single. In this study, the mean score was 23.84 (±11.90) for GHQ and 45.01 (±8.93) for DTS. There was no significant relationship between different variables and their dimensions and students' academic performance. Conclusion:Improving the mental health of dental students is very important and should be on the agenda of educational policy makers.

Study of the biologic behavior of odontogenic keratocyst and orthokeratinaized odontogenic cyst using TGF-alpha and P53 markers.

Odontogenic keratocyst (OKC) is an aggressive cyst, and its recurrence rate is higher than that of other odontogenic cysts. Orthokeratinized odontogenic cyst (OOC) is less aggressive than OKC, but bears the probability of carcinomatous changes. In this study, we evaluated the expression and intensity of P53 and TGF-alpha in order to compare the biologic behavior or probable carcinomatous changes of these two cysts. In this cross-sectional study, 15 OKC and 15 OOC were stained immunohistochemically for P53 and TGF-alpha using the Novolink polymer method. Then, all slides were examined by an optical microscope with 400× magnification, and the stained cells in the basal and parabasal layers were counted. Finally, the results were analyzed by the Mann-Whitney and Wilcoxon tests (P-value<0.05). The difference between the expression of P53 and TGF alpha in the basal layer of OKC and OOC was not statistically significant (P-value>0.05), but the expression of P53 and TGF-alpha in the parabasal layer in OKC was statistically higher compared to OOC (P<0.05). Considering the known role of P53 and TGF-alpha in malignant changes and the higher expression of P53 and TGF-alpha in OKC compared to those in OOC, the probability of carcinomatous changes was higher in OKC than in OOC.

Mandibular intraosseous schwannoma in a child: Report of a rare case.

Intraosseous schwannomas is a very rare neoplasm, and less than 50 cases have been reported in the medical literature. In this article, the clinical, radiographic and histopathologic appearances of a rare case of intraosseous schwannomas are presented. The importance of this case is that other benign central lesions such as odontogenic tumors and cysts might be included in differential diagnosis. This case was recognized in a 9-year-old child, which is a very rare occurrence. The diagnosis was confirmed by immunohistochemical staining with S100 protein.

Metastatic anaplastic large cell lymphoma of the oral cavity.

Lymphoma is a malignant neoplasm of lymphoid tissue which is divided into 2 groups: Hodgkin and non-Hodgkin. About 85% of non-Hodgkin lymphomas are B-cell lymphomas, and T-cell lymphomas are unusual. Anaplastic large cell lymphoma (ALCL) is a kind of non-Hodgkin lymphoma with T or NK cell origin that is rarely seen in the oral cavity and only 10 cases have been reported up to now. Here we present a case of ALCL metastasized to the oral cavity in a 32- year- old man with pervious history of ALCL which caused an ulceration in the posterior area of the hard palate. Radiography showed irregular resorption of alveolar bone. Histopathologic examination of the incisional biopsy revealed neoplastic proliferation of large and bizarre cells with hyperchromatic nuclei and numerous giant cells and atypical mitoses. Immunohistochemistry markers (CK, LCA, CD3, CD30, CD20) confirmed the diagnosis of ALCL.

Effect of object location on the density measurement in cone-beam computed tomography versus multislice computed tomography.

BACKGROUND: Bone density measurement in a radiographic view is a valuable method for evaluating the density of bone quality before performing some dental procedures such as, dental implant placements. It seems that Cone-Beam Computed Tomography (CBCT) can be used as a diagnostic tool for evaluating the density of the bone, prior to any treatment, as the reported radiation dose in this method is minimal. The aim of this study is to investigate the effect of object location on the density measurement in CBCT versus Multislice computed tomography (CT). MATERIALS AND METHODS: In an experimental study, three samples with similar dimensions, but different compositions, different densities (Polyethylene, Polyamide, Polyvinyl Chloride), and three bone pieces of different parts of the mandibular bone were imaged in three different positions by CBCT and Multislice CT sets. The average density value was computed for each sample in each position. Then the data obtained from each CBCT was converted to a Hounsfield unit and evaluated using a single variable T analysis. A P value <0.05 was considered to be significant. RESULTS: The density in a Multislice CT is stable in the form of a Hounsfield Number, but this density is variable in the images acquired through CBCT, and the change in the position results in significant changes in the density. In this study, a statistically significant difference (P value = 0.000) has been observed for the position of the sample and its density in CBCT in comparison to Multislice CT. CONCLUSIONS: Density values in CBCT are not real because they are affected by the position of the object in the machine.