maryam eslami manouchehri

Age estimation of individuals older than 21 years remains a challenge in forensic medicine. This study sought to assess the accuracy of age estimation by Kvaal’s method using cone beam computed tomography (CBCT) scans of mandibular canine teeth in an Iranian population.

 In this cross-validation study, information of 150 test subjects and 30 controls was collected from the files of patients presenting to Shahid Beheshti University of Medical Sciences, School of Dentistry from 2014 to 2015. The parameters used in the Kvaal’s method were measured in mandibular canine teeth on CBCT scans of patients. First, the regression formula suggested by Kvaal et al, was used for age estimation. Then we designed our own formula for age estimation according to Kvaal’s method in our Iranian population and the fitness of statistical model was assessed.

 Use of multiple linear regression model for assessment of the correlation of parameters in Kvaal’s method according to CBCT images of mandibular canines and age in a step by step fashion showed that all variables namely pulp length/root length, pulp length/tooth length, pulp width/root width at the cementoenamel junction (CEJ) and pulp width/root width at the mid-point of CEJ and mid-root were significant in age estimation (P<0.005 for all four). In this model, R2 was found to be 0.567, which indicated appropriate fitness of the regression model this should be revised "optimal". In this model, no significant linear correlation was noted between independent variables such that the variance inflation factor was maximally 1.4.

 Although most of the variables mentioned by Kvaal were effective in age estimation, some errors were seen in age estimation in the modeling and cross-validation phase. Thus, some other variables need to be included in the model to increase the accuracy of Kvaal’s formula in the Iranian population.

With regards to the increasing use of implants in the field of dentistry, the recognition of critical landmarks is essential. Nasopalatine canal (NPC) is one of these important indices, which due to high esthetic expectations in premaxilla, should be precisely evaluated before surgery..
This study aimed to evaluate the morphological and anatomical variations of the NPC..
A total of 326 individual cone beam computed tomography (CBCT) images were analyzed in sagittal, coronal, and axial planes in order to evaluate the dimensions, morphology and anatomic features of the NPC. The canal shape, length, and curvature, incisive and Stenson’s foramina (SF) dimensions, and the number of openings on both sides of the canal were assessed. The correlation of age, gender, and dental status with all considered parameters were analyzed..
The most dominant shape of the NPC was cylindrical (65.33%). The mean NPC length was 12.85 ± 2.63 mm, which was greater in men and showed significant differences between two genders (P This study has highlighted the anatomical variations of NPC regarding its dimension, location and morphological appearance. Cylindrical was the most common shape followed by funnel-shape, hourglass, and spindle, which were the other canal shapes with less frequency, respectively. The results suggest significant relationship between NPC, and gender and dental status. The influence of age was not as significant as gender and dental status..

The goal of this study was to evaluate the clinical efficacy of a standard oral hygiene routine (daily tooth brushing and flossing) along with cetylpyridinium chloride (CPC) mouthwash in comparison to the same pro-tocol without mouthwash in chronic periodontitis patients during a 14-day period. This comparative study was carried out or 50 non-smoking patients with chronic periodontitis; 25 patients followed an oral hygiene regimen using a toothbrush and dental floss (control group) and the remaining 25 used the mentioned protocol along with CPC mouthwash (test group) for 14 days. The plaque index (PI), modified gingival index (MGI) and probing pocket depth (PPD) were assessed. Wilcoxon and Mann-Whitney U tests were used to evaluate and compare the prevalence of indices between the two groups. Statistical significance was set at P<0.05. The results showed greater improvement of MGI in the test group (P=0.001). No statistically significant differences were observed in PI (P=0.47) and PPD (P=0.43) between the two groups. Adding mouthwash to a standard oral hygiene regimen may improve some clinical gingival parameters when compared with an oral hygiene routine without a mouthwash.

Desmoplastic fibroma (DF) is a rare and locally aggressive intraosseous tumor with unknown etiology. The mandible is the common site of involvement in the maxillofacial region. However, it is believed that DF can arise in any bone of the body. A wide age distribution has been reported for DF occurrence, extending from birth to the sixth decade of life, with a peak incidence at 10 to 19 years of age. In this study, diagnostic and therapeutic management of a 6-year-old girl with a desmoplastic fibroma of the inferior orbital rim and zygomatic buttress are discussed. Cone beam computed tomography (CBCT) revealed a mixed lesion in infraorbital rim, which had ill-defined borders and a straight thick bony septum inside the lesion. It also involved the zygomatic process of maxilla and zygomatic bone. According to radiologic concepts, this rare lesion may mimic fibro-osseous, benign and especially malignant lesions. Regarding different treatment plans, identification of this lesion is essential. Furthermore, presence of coarse and irregular or straight septa along with some imaging criteria for malignant lesions such as destruction of the cortex, periosteal reaction and soft tissue invasion would be helpful to differentiate this lesion from malignant and multilocular benign lesions..