Ahmed A El-Hejazi

Ahmed A El-Hejazi
King Saud University | KKUH · Department of Restorative Dental Science

BDS(Benghazi), MSc (Lond.), PhD(Manchester)
Professor (full) Aesthetc and Operative Dentistry at College of Dentistry. King Saud University

About

31
Publications
13,295
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Introduction
Ahmed A El-Hejazi currently works at the Department of Restorative Dental Science, King Saud University. Ahmed does research in Dentistry. Their current project is PhD thesis' supervision and also working in Wear behavior of different dental ceramic against natural enamel after simulator bruxism procedures.Also nanoparticles
Additional affiliations
October 2012 - present
King Saud University
Position
  • Professor and Consultant, Operative and Esthetic Dentistry,
Education
October 1991 - July 1995
The University of Manchester
Field of study
  • restorative
August 1982 - July 1985
UCL Eastman Dental Institute
Field of study
  • conservative dentistry

Publications

Publications (31)
Article
Purpose/Aim: To determine the effect of translucency of four CAD/CAM materials and different curing modes on the degree of conversion of resin cements. Materials and Methods: Disks were fabricated from IPS e.max CAD, Vita Suprinity, Vita Enamic, and DD Cube X². Translucency was measured using a spectrophotometer. The degree of conversion of two res...
Article
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In this study, the biaxial flexural strength (BFS) and fractography of high/ultra-translucent monolithic zirconia ceramics subjected to different mechanical surface pretreatments were evaluated. A total of 108 disc-shaped samples (12 mm diameter, 1.2 mm thickness) of three zirconia materials (5Y-ZP KATANA Zirconia UTML (ML), 3Y-TZP DD Bio ZX2 (DB),...
Article
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This in vitro study compared the effects of conventional and electronic cigarettes on the aesthetics (color stability and translucency) of two types of composite resins: micro and nano-hybrid. Methods: A total of 120 specimens from two different composite materials Filtek Z250 XT (Nano-hybrid, 3M) and Filtek Z250 (Micro-hybrid, 3M) were divided int...
Article
Full-text available
Abstract: In this study, the biaxial flexural strength (BFS) and fractography of high/ultra-translucent monolithic zirconia ceramics subjected to different mechanical surface pretreatments were eval�uated. A total of 108 disc-shaped samples (12 mm diameter, 1.2 mm thickness) of three zirconia materials (5Y-ZP KATANA Zirconia UTML (ML), 3Y-TZP DD Bi...
Article
Full-text available
We can avoid many complications before endodontic treatment by knowing the variation between maxillary right and left premolars and molars regarding canals, roots length, and roots numbers. The data collected and were compared between right and left maxillary premolar and molar teeth by using CBCT. All the maxillary first and second molars had t...
Article
Full-text available
Objective: The aim of this study was to investigate the effect of water sorption on the colour stability of resin materials veneered to fixed restorations. Materials & Methods: Three resin materials used for veneering fixed restorations were investigated namely: New Metacolor Infis (Sun Medical Co.), Artglass (Kulzer) and Sculpture (Jeneric/Penetro...
Article
Full-text available
Objective The aim of this study was to assess: (1) the perceptions of dentists in Saudi Arabia concerning the amalgam controversy, (2) their attitude toward the ethical responsibility of patient information, and (3) patients’ knowledge and attitude toward the use of dental amalgam. Materials and Methods A total of 1,139 dentists were sampled on con...
Article
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Aim of the Study: The aim of this study is to evaluate the preference of Saudi population regarding the golden proportion in the relation to the position of dental papilla. Methods: A computer image manipulation program (Adobe Photoshop CS, Adobe Systems, San Jose, CA, USA) was used to produce a golden proportion smile of the maxillary anterior tee...
Article
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Introduction In recent years, a large number of patients are looking for whiter teeth by trying different tooth-whitening techniques. They tend to use natural homemade recipes such as; strawberries, coconut oil rinse, basil, lemon, activated charcoal, apple cider vinegar, baking soda, and turmeric. There is lack of studies done on these natural whi...
Article
Full-text available
The aim of this study is to evaluate the preference of Saudi population regarding the golden proportion in the relation to the position of dental papilla. Methods A computer image manipulation program (Adobe Photoshop CS, Adobe Systems, San Jose, CA, USA) was used to produce a golden proportion smile of the maxillary anterior teeth and to change t...
Article
This study evaluated the influence of changing light energy density, as a result of the use of different distance levels of irradiation, on the nanohardness and modulus of elasticity of four composite materials. Two nano-composites (Filtek Z-350 XT; Tetric-N-Ceram), a submicron hybrid composite (Spectrum TPH3) and a microhybrid composite (Filtek P9...
Article
Full-text available
Objectives: This study aims to assess the self-perception of female dental students of their dental aesthetics regarding their satisfaction, its effect on their quality of life and felt need for treatment. Materials and Method: This is a descriptive study for 1st, 2nd and 3rd year dental students (n=110) in the College of Dentistry at Princess Nour...
Article
Full-text available
Objectives: This study aims to assess the self-perception of female dental students of their dental aesthetics regarding their satisfaction, its effect on their quality of life and felt need for treatment. Materials and Method: This is a descriptive study for 1st, 2nd and 3rd year dental students (n=110) in the College of Dentistry at Princess Nour...
Article
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The objectives of the present study were to determine the caries experience, oral hygiene status and consumption of dates among Saudi female University students. A total of 406 female University students were examined for dental caries and oral hygiene. The information about oral hygiene practices and consumption of dates was obtained through a sel...
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Background: Dentistry education requires a great deal of hands-on learning as well as content-based learning. Although each individual has a unique learning style, our group of educators sought to understand the predominant learning style preferences of a cohort of 84 dental students. The aim of this study was to investigate the learning style pref...
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Purpose: To evaluate the effects of the different available intraoral ceramic polishing systems on the surface roughness of the latest ceramic materials. Methods: Eighty ceramic discs (5mmx2mm) were prepared from 2 ceramic materials (VM9 and e.max) using stainless steel mold. The discs were then randomly divided into 4 subgroups for each material (...
Research
Full-text available
Creep and Visco-elastic recovery of Cured and Secondary- cured dental composites and Resin Modified glass-ionomer
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OBJECTIVE: The purpose of this study was to evaluate the effect of try-in paste shade on final resin luting cements on colour difference under porcelain laminate veneer. MATERIALS & METHODS: Variolink II Esthetic cementation systems; (Ivoclar Vivadent, Liechtenstein.) shade A1/110 was used in this study. This cement had two types of curing methods;...
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Unlabelled: The aim of this study was to investigate the effect of light intensity on polymerization shrinkage of resin composites. The five materials tested were Lite-Fil (A) (LFA), Lite-Fil (P) (LFP), Z100, Palfique, (PAL) and Tetric (TRC). Two types of measurements were made to determine the effects of environmental temperature and light intens...
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Full-text available
Composites and compomers are popular in dental practice. However, little is known about their esthetic appearance as veneering restorative materials over amalgam restorations. This in vitro study was designed to assess the color differences of composite and compomer restorative materials, placed in thicknesses of 1 mm and 2 mm over amalgam. Thirty...
Article
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The aim of this investigation was to compare the microleakage of composite resin (Z-100) and shear bond strength to bovine dentin using different types of adhesive systems (Scotch Bond Multi-Purpose, All-Bond 2, One-Step, and Perma Quick) to compare and correlate microleakage to shear bond strength. For the microleakage aspect of the study, 20 clas...
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Full-text available
Objectives: Composite reins and compomers are popular in dental practice. However, little is known about their esthetic appearance as veneering restorative materials over amalgam restorations. This in-vitro study was designed to assess the color changes of composite and compomer restorative materials, placed in thickness of 1 mm and 2 mm over the g...
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Full-text available
OBJECTIVE: The aim was to determine the magnitude and rate of development of lateral stress arising from hygroscopic expansion over 6 months. A suitable methodology was described by Momoi and McCabe. MATERIALS & METHODS: Nine materials (4 Composites, 1 Compomer, 1 Resin-modified glass-ionomer cements, 1 adhesive and 2 dual-cure luting cements) were...
Article
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The aim of this study was to investigate the effects of water sorption and solubility of two types of light cured restorative materials (hybrid and microfine composites). Six composite materials were selected - Silux Plux (SLX), Clear Fil Photopost (CRF), Durafil (DUF), Helio Progress (HLO), P10 (P10) and Ful-Fil (FUL). The experimental methods wer...
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The aim of this study was to evaluate tooth-color filling materials from literature point of view The tooth-color filling materials were divided into three components , first composite, second glass ionomer cements and third hybrid resin ionomer materials. From the advantages of composites such as color and strength and the advantages of glass iono...
Article
Full-text available
The aim was to investigate the effect of Xenon light (aging) on colour stability of light‑cured (VLC) resin‑composites. Four materials were selected (Tetric, Lite‑Fil II, Palfique and Z100). Control specimens were kept in darkness and exposed to water at 37°C. Test specimens were exposed to a xenon light source at 150 klox and 37°C water. All sampl...
Article
Full-text available
The aim of this investigation was to study whether secondary curing had any effect or not on the visco-elastic stability of resin-based restoratives. Five resin composite restorative materials (Tetric, Z100, Lite-fil, Palfique, Graft LC) and two resin-modified glass-ionomers (RM-GIC) (Fuji II LC&Photac-Bond), were chosen as representative of those...

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