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Background and purpose: Since there is a few studies about the reasons of endodontic treatment in Iran, it is necessary to evaluate factors and patients informational rate in all geographic regions for prevention and suitable treatment. So we decide to evaluate the reasons of endodontic treatment in patients who referred to endodontic group. Materials and methods: A descriptive cross-sectional study was carried out on 1,150 cases of Department of Endodontic in Babol dental school for each case, information was collected in a questionnaire including clinical and radiographic and systemic status of patients. Data were analyzed by statistical methods. Results: Out of 1150, 858 cases were perfect which were analyzed. Of the 858 treated teeth, 328 (36.8%) were males and 530 (59.6%) were females. The reasons for endodontic treatment were carries (82.2%), retreatment (7.2%), endo for prostheses (5.6%), restorative reasons (2.1%), trauma (2.8%) and periodontal disease (0.1%). Endodontic treatment was done in first and second and third molars in 42.9%, 16.2%, and 2%. There are in radiographic view 60.6% normal appearance, 18.4% periapical radiolucency, 15.4% widening of PDL and 0% root fracture. Systemic disease was 14.4% in patients with root canal therapy (RCT). Pain with cold, warm and endo for crown was 51.5%, 28.7%, and 1.4%, respectively. Conclusion: The most common reason for attending to dental school was pain. The most common and uncommon reasons for RCT were dental carries and periodontal disease. The most common and uncommon teeth were first and third molar. Pain with cold and endo for crown were the most common and uncommon findings. [ABSTRACT FROM AUTHOR]

Introduction: Ameloblastoma is a benign epithelial odontogenic tumor that exhibits a more aggressive behavior than odontogenic keratocyst and follicular cyst. The purpose of this study was to determine and evaluate histomorphometric characteristics and blood vessels pattern adjacent to and far from odontogenic epithelium on the clinical behavior of the above odontogenic lesions with immunohistochemistry and morphometry method. Materials & Methods: In this descriptive-cross-sectional study, 45 paraffin blocks of mentioned lesions were selected and marked immunohistochemically with CD34. From three HPFs (High Power Fields) in each slide which had more density of blood vessels in adjacent to and far from odontogenic epithelium, photography was done by a camera joined to a microscope with 40 times magnification. Through the software Motic plus 2, the internal and external diameters, section surface and thickness were determined. Also the blood vessel pattern was determined in the mentioned lesions and was compared through ANOVA, t-test and Multiple Comparison Test. Results: The external and internal diameters and sectional surface in the regions far from the odontogenic ephithelium in ameloblastoma was greater than keratocyst (P<0.001) and dentigerous cysts (P=0.001) but there was no significant statistical differences seen in the thickness of blood vessels in the regions far from the odontogenic ephithelium in three lesions (P=0.05). Significant statistical difference was not seen in external (P=0.8) and internal (P=0.8) diameters, sectional (P=0.6) surface and blood vessels thickness in the adjacent regions of odontogeni ephithelium in these three lesions. The pattern of blood vessels in ameloblastoma was circumferential and in the keratocyst and follicular cyst, it was directional. Conclusion: It seems that morphometric characteristics of blood vessels (internal and external diameters, sectional surface) in areas far from odontogenic ephithelium and the type of blood vessels pattern affects clinical aggressive behavior of ameloblastoma more than keratocyst and follicular cyst. [ABSTRACT FROM AUTHOR]