A Study of maxillary and mandibular alveolar widths in skeletal class II compared with skeletal class I in adults ) Cone-Beam Computed Tomography Study )

Class II malocclusion is a common clinical problem among white Caucasian population and its transverse component is a critical aspect of a functional and stable occlusion. The size and shape of the arches have considerable implications in orthodontic diagnosis and treatment planning, affecting the space available, dental esthetics, and stability of the dentition. Hence , it is important to study the alveolar arch width in this group of patients using the wide possibilities of cone beam computed tomography of evaluating real anatomy , true-to-scale images without distortions or superimpositions, and the selection of the desired sections.Objective:To evaluate the width of maxillary and mandibular alveolar arches in skelatal Class II adults compared to skeletal class I using cone beam computed tomography. Materials and methods: thirty-two subjects with skeletal Class II relationship and 10 subjects with skeletal Class I who were ordinary undergoing CBCT scan for non-orthodontics nor for otorihnolaryngology purpose were selected to measure the maxillary and mandibular alveolar width of first premolar and first molars.Independent samples’ t-test was calculated. Results:No statistically significant differences were found of alveolar widths between skeletal Class II and Class I subjects in both maxillary and mandibular widths of molar and premolar regions. Gender had no statistically significant effect in the results of the study. Conclusion :There is no differences in alveolar width between adults with skeletal Class II and Class I relationships, so the transverse discrepancy in skeletal Class II when exsists , it is more probably not originated from the alveolar base.

Relation between temporomandibular joint and normal growth pattern in female adult (CT scan study)

The aim of this research is to investigate the dimensional and positional symmetries between the right and left condyles ,and the possible asymmetries between the condylar processes that could be related to the type of growth pattern in adult subjects with no clinical nor radiographic symptoms of TMDs. Materials and methods: In result of a multistage clinical examination protocol, 14 Caucasian patients with normal growth pattern ,and with no prior orthodontics treatment were selected (14 females)from 17 to 29 years of age with no clinical signs and symptoms of TMDs. The images obtained from the axial and sagittal slices, Cephalometric growth pattern study was performed. Pearson's Correlation Coefficient and T-test were calculated. Results :no statistically significant relationship between the measurements of TMJ(left &right) and the normal growth pattern. Conclusions:There is no relationship between the morphology of TMJ and normal growth pattern in adult female orthodontically non-treated .

Prevalence and Location of Maxillary Sinus Septa in the Syrian Population (Radiological study)

Presence of maxillary septa has been known to be a complicating factor for sinus elevation procedure. This study was aimed at detecting the prevalence, location and height of antral septa in syrianpopulation and to determine whether there is a relationship between the presence of septa and the absence of upper molars . A total of 174 sinuses in 87 patients (59 male and 28 female) aged 27 - 51 years were evaluated through a computed tomography scan analysis . No correlation was observed between the presence of septa and the absence of upper molars.

Prognostic Evaluation of Hodgkin's Disease after Chemotherapy Using Gallium-67 Scintigraphy

Forty one patients with Hodgkin’s disease (HD) were investigated with 67Ga Scintigraphy before and after the completion of chemotherapy. At the same time, all patients underwent computer tomography (CT) scans. Patients were followed up for 28-60 months (average 40 months). Patients were divided into groups according to the positivity or negativity of the gallium scan after chemotherapy: 32 patients had negative gallium scans, and 9 patients had positive gallium scans. In the gallium–negative group, 18.7% of the patients relapsed and 93.8% were alive at the end of the follow-up. In the gallium positive-group, 88.8% of the patients had recurrent disease and 77.7% were alive after intensive chemotherapy. There was a statistically significant difference in the overall survival between patients with positive gallium results and patients with negative gallium results (P= 0.0041). The disease-free survival differed significantly between patients with positive gallium scan and patients with negative gallium scan at the end of chemotherapy (P< 0.001). The relative risk of death was 4.3 and the relative risk of relapse was 12 for patients with positive gallium scans, in comparison to those with negative gallium scans. The positive and negative predictive value for predicting relapse was 89% and 81% respectively.

Reliability of Periapical Photographs in the Evaluation of Root Shortening During Orthodontic Intrusion

Apical root resorption is a common adverse effect during orthodontic treatment, specially the intrusion forces. Apical photographs by using the parallel technique and with the help of some formulas were the most common approaches to investigate the root resorption. The aim of this study was to study the reliability of periapical photographs in evaluating of root length shortening during orthodontic intrusion forces, by comparing with that diagnosed by using the CT-scan images.