Hesham Khalil

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Glutathione S-transferases (GSTs) are an important group of isoenzymes that play an essential role in the detoxification of carcinogens. Polymorphism at exon 5 of the GST π family decreases the catalytic activity and affects the detoxification ability of the enzyme, GSTP1. GSTP1 promoter hypermethylation and loss of expression are frequently observed in(More)
In this article we give a detailed presentation of state event logic which is a modal logic for reasoning about concurrent events and causality between events 8]. State event logic diiers from previous approaches in the following directions: First, events enjoy the same attention as states. In the same way as states can be viewed as models of the formulae(More)
BACKGROUND Sex determining factor (SRY) located on the short arm of the Y chromosome, plays an important role in initiating male sex determination, resulting in development of testicular tissue. Presence of the SRY gene in females results in XY sex reversal and increased risk of gonadal germ cell tumours if the karyotype also includes the so-called(More)
BACKGROUND The purpose of this study was to investigate the reasons for and patterns of extraction of permanent teeth in a subset of the Saudi population. METHODS During a 3-month period, dentists were asked to record, using a specially designed survey form, the reasons for every extraction of a permanent tooth. The reasons for tooth extraction were(More)
BACKGROUND Warfarin is one of the most common oral anticoagulants used to prevent thromboembolic episodes. The benefits of discontinuation of this drug before simple surgical procedures are not clear and this approach could be associated with complications. The aim of this study was to evaluate the risk of bleeding in a series of 35 patients (in cases where(More)
The inferior alveolar nerve block is the most common injection technique used in dentistry and many modifications of the conventional nerve block have been recently described in the literature. Selecting the best technique by the dentist or surgeon depends on many factors including the success rate and complications related to the selected technique.(More)
BACKGROUND The purpose of this study is to determine the type and frequency of pathological conditions around third molar teeth among randomly selected patient's records in Oral and Maxillofacial Surgery, College of Dentistry, King Saud University, Riyadh. MATERIALS AND METHODS Totally, 281 patient panoramic radiographs were selected with detectable(More)
Dental implants have been used in a variety of different forms for many years. Since the mid-20(th) century, there has been an increase in interest in the implant process for the replacement of missing teeth. Branemark was one of the initial pioneers who applied scientifically based research techniques to develop an endosseous implant that forms an immobile(More)
In some cases, surgeons need to navigate through the computer system for reconfirmation patients' details and unfortunately surgeons unable to manage both computer system and operation at the same time. In this paper we propose a solution for this problem especially designed for heart surgeon, by introducing voice activation system with 3D visualization of(More)