Comparison of retinal nerve fiber layer (RNFL) thickness and perimetry findings in glaucomatous patients

Aim: to determine the value of RNFL thickness at which visual field defect becomes detectable. Methods: Our study included 29 normal subject and 36 glaucomatous patient (one eye per person) .Every person was examined by OCTOPUS perimetry with glaucoma 30-2 program, and peripapillary RNFL thickness was measured by HIEDELBERGSPECTRALIS SD_OCT. Results: comparison of results showed higher sensitivity of OCT compared to Perimetry. Mean RNFL thickness at which visual field defect showed was 87 microns. Superior RNFL thickness value which correlated with inferior visual field defect was 101 microns, whereas inferior RNFL thickness value which correlated with superior visual field defect was 75 microns .and the difference in RNFL thickness between normal and glaucomatous visual field was significant (p<0.001). Conclusion: in open-angle glaucoma , it needs significant thinning in RNFL before visual field defects becomes detectable.

Macular Thickness Measurements in Diabetic Patients Using the Optical Coherence Tomography (OCT)

The OCT is a recent diagnostic tool for non-invasive tissue examination, which has been used in clinical practice since 1995. The OCT is similar to the ultrasonic tomography in that it relies on optical waves rather than ultrasound ones. The ability to obtain highcontrast images of the retina in a non-invasive manner has made this examination very important in retinal diseases associated with macula.. Therefore, our objective is to study the statistical values of the measurements of the macular thickness using Optical Coherence Tomography (OCT) and the relationship of each value to age, sex, medication ,duration of diabetes ,and the visual acuity in diabetic eyes. Therefore, the accurate measurement of the macular thickness is important to follow up disease progression, evaluate treatment and accurately diagnose lesions of visual acuity. The thickness of the macula in the left and right eye was thicker in males than in females. We find out that the visual ability declines with age. For both left and right eyes, the thickness of the macula increases with age and the content of the macula correlates with its thickness and the period of the disease. There are no statistically significant differences of the thicknesses with different treatment types (insulin or pills),so we notice a correlation between the visual acuity and the thickness of the macula in both eyes ,so that the higher the thickness of the macula in diabetic patients ,the lower the visual acuity . In the study of the different parts of the macula, the internal part is thicker than the external part and the nasal part is thicker than the different parts of the macula, and the nasointernal part is the thickest.

Astudy of the effect of Sagital malocclusion at Class I and Class II on Facial Asymmetry at the Frontal Plane for a Sample of Patients Using Computed Tomography (CT)

The asymmetric face is common so that increased interest in it .there are different ways to assess the asymmetry. Computed tomography is an accurate way that enable the examiner for reading the face at three planes ,and present three-dimensional information on the cranial mandibular Complex whereas (3D) analysis is essential for making a precise diagnosis of craniofacial morphology. Aim : This research aims to study the asymmetric at the facial patterns malocclusion (class I. Class II) using CT . the research sample consists of 48 CT image (male 23 and female 15)their ages ranged between 18 and 35 years old and did not receive any orthodontic treatment before, and devided into two groups according to the malocclusion ptterns(17 class II, 31 class I ) . Analysis was performed T. student test then calculated for all the data obtained . This study showed that a significant difference between the class I and class II malocclusion in each of the right and left.

Evaluation of the Upper Airway Changes in Class II Patients Resulting From Functional Treatment Using Cone Beam Computed Tomography - An In Vivo Study

Objective: This research aimed to evaluate the three-dimensional effects of a Twin Block (TB) appliance on the pharyngeal airway passage (PAP) in a sample of Class II patients with mandibular retrusion using cone-beam computed tomography (CBCT).

The Effect of Rapid Maxillary Expansion on the Spheno-occipital Synchondrosis in Children using Cone Beam Computed Tomography

The RME force is not only concentrated on widening the maxilla, it is concomitant changes occur in craniofacial sutures, from here the need for this study was originated. Aim of the study: To investigate the immediate effect of rapid maxillary expansion on the spheno-occipital Synchondrosis in children using cone beam computed tomography.

Astudy of the effect of Sagital malocclusion at Class I and Class III on Facial Asymmetry at the Frontal Plane for a Sample of Patients Using Computed Tomography (CT)

The asymmetric face is common so that increased interest in it . there are different ways to assess the asymmetry. Computed tomography is an accurate way that enable the examiner for reading the face at three planes ,and present three-dimensional information on the cranial mandibular Complex whereas (3D) analysis is essential for making a precise diagnosis of craniofacial morphology . Aim : This research aims to study the asymmetric at the facial patterns malocclusion (class I. Class III) using CT .

Implant Designing Of Hip Bone Whichsuffer From Cancer By Using Cad Programs

This research aims to convert CT data of hip bone that sufferining cancer to 3D model, and designing metal implant of the infected area on the mechanical analysis programs, to study operability and convenience in terms of distribution of stresses and forces just as in patient’s body after installation and under the guidance of the bone surgeon.By depending on Mimics software to read the CT image and 3MATIC to convert the image to 3D digital model after generation the surface and the volume of the implant, the analysis process of stresess and forces in COMSOL software. Where after design and analysis the metal implant was appropriate mechanicaly and do not contain dangerousareas after the application of the expected forces.

The Relationship Of The Upper Airway Morphology With The Cephalometric Features Determining Sagittal intermaxillary Relationship In Adults Using Three Dimensional Computed Tomography

Introduction : The respiratory functions have wide effects on the orthodontic diagnosis and the treatment planning, besides their effects on the stability of the treatment results. So it is important to have a better and more deeply analysis of the upper airway morphology, and to evaluate its relationship with the cephalometric features that determine the intermaxillary relationship . Objective: The aim of this study was to evaluate the relationship of the size and areas of the upper airways in adults to the sagittal intermaxillary relationship using sagittal and axial slices of three dimensional computed tomography. Materials and methods: The Sample's consisted of 29 adults (12males,17 females) selected from patients who were ordinary undergoing 3DCT for non-orthodontic nor otolaryngology purposes and didn’t have orthodontic treatment . the anteroposterior positions of both the maxilla and the mandible were evaluated with the ANB angle , AF-BF distance and Wits appraisal .Then Pearson's Correlation was calculated to investigate the possible relationship between the upper airway measurements and the Cephalometric measurements determining intermaxillary relationship at the sagittal plane. Results: We found statistically significant correlation between the upper airway measurements and the cephalometric measurements determining sagittal intermaxillary relationship. The depth and area of NA showed negative correlation with ANB ,WITS,AF-BF (p＜0.05). We noticed that females have statistically significant smaller oropharyngeal depth than males. Conclusions: There is a statistically significant correlation between the upper airway measurements and the cephalometric measurements determining the sagittal intermaxillary relationship in adults with no clinical symptoms of the upper airway disorders..

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.

Evaluation Of The Relationship Between The Upper Airway Morphology And Facial Growth Type In Adults of The Syrian Coast Using Three Dimentional Computed Tomography

This study aimed to investigate the relationship of the size and areas of the upper airway with the Facial growth type in adults ,and to investigate the differences in upper airway measurements between males and females using sagittal and axial slices of three dimensional computed tomography.