Wafa El-Badrawy

Wafa El-Badrawy
University of Toronto | U of T · Department of Clinical Sciences

BDS, MSc, NDEB Certificate

About

65
Publications
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Introduction
Associate Professor, member of the School of Gradute Studies - University of Toronto. On the editorioal board of several journals and a reviewer for several other journals

Publications

Publications (65)
Article
Objectives: To investigate the latest teaching policies of posterior composite placement versus amalgam and to determine the actual numbers of posterior composites versus amalgam restorations placed in Canadian dental schools, over the years from 2008 to 2018. Methods: Emails were sent to Chairs/Heads of Restorative Departments and Clinic Direct...
Article
Clinical Relevance Using a patient simulator, dental professionals were tested to determine their ability to light-polymerize simulated restorations in their dental practice. After receiving specific instructions and training using the simulator, their ability to deliver sufficient light to polymerize restorations was significantly and substantiall...
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Full-text available
The properties of commonly available computer-assisted-design/computer-assisted manufacturing (CAD/CAM) materials against natural teeth need to be confirmed to assist informed clinical decision-making. Objectives: The purpose of this study was to assess the wear and surface roughness (SR) of different CAD/CAM restorative materials and their antagon...
Article
Background Nearly 40% of US physicians experience occupational burnout. The actual prevalence rate of burnout among US dentists remains unknown. The authors examined a simplified 2-item burnout screening tool based on the Maslach Burnout Inventory (MBI) to identify possible occupational burnout among dentists. Methods Data were obtained from a sur...
Article
Background: Paediatric dentists in the United States may be at greater risk for occupational burnout and/or depression because of chronic stress associated with provision of paediatric dental care and increasing prevalence of females in the workforce. Aims: To determine the prevalence of occupational burnout and/or depression among US paediatric...
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Full-text available
Background: The wide range of restorative materials available for use in the computer-aided design/ computer-aided manufacturing (CAD/CAM) technology requires a better understanding of their esthetic properties. Objectives: The aim of the study was to assess the stability of the color and translucency of different CAD/ CAM restorative materials...
Article
Objective: The objective of this study was to assess the shear bond strength (SBS) of orthodontic brackets bonded to uncut enamel with universal self-etch 1-step adhesive systems. Methods: Extracted uncut premolars (n = 160) were randomly divided into 4 groups for treatment with Scotchbond Universal Adhesive (SU), All-Bond Universal (BU), Clearf...
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Full-text available
This study investigated the effect of bulk-fill composites on proximal contact tightness (PCT) of composite restorations using different matrix systems. 150/standardized-MO-ivorine cavity preparations were divided into 5 groups; Smart Dentin Replacement (SDR), SonicFill (SF), Tetric EvoCeram Bulk-Fill (TEB), G-ænial Universal Flo (GF) and Tetric Ev...
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Background: Bulk-fill composites were developed to simplify composite placement and minimize polymerization shrinkage stresses, which can improve gingival marginal adaptation in deep class II cavities. Objectives: The objective of this study was to compare the gingival microleakage of class II cavities restored with bulk-fill composites to that...
Article
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The aims of this study were to evaluate 1) the effect of different light-curing training methods on first-year dental students' light-curing performance immediately after and one year after training and 2) the effect of dental student year (first vs. third year) and different light-curing training methods on students' light-curing efficacy. The stu...
Article
Purposes: To assess the clinical performance of Pedo Jacket crowns for restoration of carious primary anterior teeth. Methods: A total of 129 carious primary incisors and canines of 48 children younger than 71 months of age- were restored with Pedo Jacket crowns and resin-modified glass ionomer cementation. They were assessed for: ease of use; p...
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Objectives The aim of this study was to evaluate the translucency and stain susceptibility of different bulk-fill restorative materials in comparison to a nanofilled composite. Materials and Methods Five high viscosity bulk-fill restorative materials, two low viscosity bulk-fill materials and one nanocomposite resin were analyzed. Discs (n=4) of tw...
Article
Objective: This in vitro study compared cuspal deflection of premolars restored with three bulk-fill composite resins to that of incrementally-restored ones with a low-shrinkage silorane-based restorative material. Materials and methods: Forty freshly-extracted intact human upper premolars were used. Reference points at buccal and palatal cusp t...
Conference Paper
Objective: The Aim of this study was to determine Knoop microhardness of bulk-fil restorative composite resins as a function of restoration depth; and to compare it to those of a hybrid composite. Method: Two Bulk-fill composites (Tetric EvoCeram, Ivoclar-Vivadent and X-tra-fil, Voco), and hybrid composite (Filtek-Supreme, 3M ESPE) used as contro...
Conference Paper
Objective: The aim of this study was to assess quality of surface finish of bulk-fill resin-composite restoratives when polished with 3 different polishing systems. Method: Two bulk-fill composites (Tetric EvoCeram, Ivoclar-Vivadent, X-tra-fil, Voco), and two hybrid composite (Filtek-Supreme, 3M, Ultra-TPH-Spectrum, Dentsply) were used. Specimens...
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Full-text available
Aim: This study investigated the effect of different fiber inserts (glass and polyethylene), bonding agents, and resin composites on the gingival margin microleakage of class V composite restorations. Materials and methods: Sixty premolars were sterilized and mounted in acrylic resin bases. Class V cavities were prepared buccally and lingually,...
Conference Paper
The ability of propionaldehyde to improve the physical and mechanical properties of comonomers has been demonstrated; however no data is available on its ability to alter resin-dentin bond stability. Objectives: To investigate the influence of propionaldehyde priming on immediate and 6-months aged dentin bond strength. Methods: Mid-coronal sections...
Conference Paper
Full-text available
Objective: This study investigated the effect of different matrix systems on proximal contact tightness of class II composite resin restorations. Method: 60 Ivorine teeth with standardized MO cavity preparations were randomly divided into 4 equal groups according to the type of matrix systems used (n=15). Group1; sectional metal matrix (Standard...
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Background: Proximal contact tightness of class II resin composite restorations is influenced by a myriad of factors. Previous studies investigated the role of matrix band type and thickness, consistency of resin composite, and technique of placement. However, the effect of volumetric shrinkage of resin and intensity of curing light has yet to be...
Article
The objective of this study was to investigate, by simulation, the effect of conventional composite resin insertion techniques on cuspal deflection using bonded typodont artificial teeth. The deflection produced by a new low-shrinkage composite was also determined. Sixty standardized MOD preparations on ivorine maxillary premolars were prepared: gr...
Article
The aim of this study was to compare microshear bond strength (µSBS) of different adhesives to normal dentin (ND) and caries-affected dentin (AD) as differentiated using the dye permeability test. One hundred freshly extracted carious teeth were ground to expose normal and cariesaffected dentin. Differentiation between both substrates was carried o...
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To compare microshear bond strength (uSBS) of two pairs of etch-and-rinse and self-etch adhesives to superficial and deep dentin. Occlusal surfaces of 40 sound extracted noncarious human molars were ground to obtain flat dentin surfaces (20 superficial and 20 deep dentin). Twenty-four teeth were used for uSBS test and 16 for scanning electron micro...
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To determine nanoleakage of CAD/CAM ceramic blocks bonded to dentin with self-adhesive resin cement. Eighteen sound extracted human molars were sterilized and sectioned into 3 mm-thick dentin sections. Trilux Cerec Vitablocks (Vita) were also sectioned into 3 mm sections, surface-treated using 5% hydrofluoric acid-etchant, and then coated with sila...
Article
Objective: The purpose of this study was to compare proximal contact tightness (PCT) of MOD resin composite restorations placed with different matricing protocols. Methods: Forty-five ivorine lower right first molars with standardized MOD cavities were equally divided into three groups according to the restoration protocol. Group 1: Sectional ma...
Article
Purpose: the aim of this investigation was to determine light intensity of QTH light curing units used in a sample of dental offices in Cairo. Methods: Dental offices were selected to participate following specific criteria for inclusion. Once enrolled a member of the research team visited the office to conduct the survey. One digital light meter (...
Article
It is becoming increasingly difficult to obtain sufficient freshly extracted human teeth to utilize in in vitro studies, particularly for bonding investigations. The purpose of this study was to investigate the effect of different storage conditions for human extracted teeth prior to their use in microtensile bond strength (microTBS) testing. Thirt...
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Objectives: The aim of this in vitro study was to assess micro-shear bond strength (µSBS) of tertiary-butanol-based adhesive under moist and dry conditions and correlate the results to resin-tags surface-area. Methods: Thirty-extracted human molars were used. Flat dentin surfaces were prepared on buccal and occlusal surfaces ready for bonding. Spec...
Conference Paper
Objective: To theoretically investigate the cuspal deflection as a result of polymerization shrinkage of methacrylate versus silorane-based composite resin materials using 3D finite element analysis. Methods: A freshly extracted maxillary premolar was prepared with a standardized 4mm deep MOD cavity which was restored and light cured in bulk. Mic...
Conference Paper
Objectives: To investigate, by simulation, the effect of restorative material, insertion technique and photopolymerisation intensity on cuspal-deflection using typodont artificial teeth. Methods: Seventy two MOD cavities (4mm width x 4mm depth) were prepared on ivorine maxillary second bicuspids with confluent gingival/pulpal floor. Teeth were di...
Conference Paper
Objectives:To determine use of the Vita 3D Master shade-guide (Vident) (V3D) by a sample of dental laboratories operating in the Geater Toronto Area (GTA). Methods:86 dental laboratories were contacted by telephone and invited to participate in a survey. This included a questionnaire comprising six questions. Questions included: 1.Whether laborator...
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The purpose of this study was to determine color changes and surface roughness of composites when they were subjected to in-office bleaching. 12 discs 15 mm in diameter and 2 mm thick were prepared from two shades (A2 & A4) of two composites, Durafil VS (DF) and TPH3 (TPH). Specimens were polished and stored in distilled water for 24 hours at 37 de...
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The objective of the current study was to compare in-vitro the proximal contact tightness (PCT) of Class II resin composite restorations (RCR) placed with different established and new placement techniques. 105 ivorine lower left first molars with standardized MO cavities were randomly divided into seven groups (n = 15) as follows: SRing: sectional...
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In its efforts to continue the modernization of its curriculum, the Faculty of Dentistry at the University of Toronto has developed a series of web-based interactive learning applications. This article presents the production cycle of these new interactive learning objects and the preliminary study conducted to measure the students’ perception of t...
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The current study was carried out to evaluate the effect of doubling the adhesive layers of three acetone-based adhesives on the microtensile bond strength and ultra morphological characterization of the resin dentin interface using SEM. A total of 27 caries-free human molars were used. Superficial flat dentin surfaces were obtained by wet grinding...
Conference Paper
Full-text available
Objectives: to evaluate the effect of two different load directions on gap formation along the tooth/restoration interface of four different bonding systems. Methods: Two total-etch bonding systems (Scotchbond-MP (SB), 3M ESPE and XP, Dentsply) and two self-etch adhesives (LS, 3M ESPE, and Xeno IV, Dentsply) were used with their corresponding resin...
Conference Paper
Objectives: The aim of this study was to compare SBS of normal dentin to different adhesives with that of caries affected dentin. Methods: 50 freshly extracted carious human molars were flattened to expose sound and caries affected dentin. Teeth divided into five groups according to adhesive tested, Clearfil SE Bond (SE), Clearfil DC Bond (DC) (Kur...
Conference Paper
Objectives: This study compared the microshear bond strength of two pairs of total-etch and self-etch adhesives from the same manufacturer to superficial and deep dentin. Methods: Occlusal surfaces of 24 sound freshly extracted human molars were ground to obtain flat dentin surfaces (12 superficial dentin and 12 deep dentin discs). Both dentin grou...
Conference Paper
Full-text available
Objectives: To evaluate the effect of pH-cycling on surface roughness and microhardness of three resin composites and a giomer at different storage periods. Methods: 3 composite resins (Ceram X, Surefil and Spectrum TPH3 - Dentsply) and a giomer (Beautifil - SHOFU) were tested in this study. 20 discs (5mm diameter x 3mm thick) of each tested materi...
Conference Paper
Objective: The purpose of this study was to investigate the effect of different aging conditions of human extracted teeth prior to their use in microtensile bond strength (TBS) testing. Methods: Thirty non-carious anterior teeth were divided into 3 equal groups, 1: freshly-extracted (used within 2 weeks), 2: aged in water at 4ₒC for 2 years 1month,...
Conference Paper
Objective: The objective of this study was to investigate by simulation the effect of composite resin insertion techniques on cuspal deflection using bonded typodont artificial teeth and also to determine the effect of a new low shrinkage composite. Methods: Sixty standardized MOD preparations on ivorine maxillary premolars were prepared - Gr...
Conference Paper
Objective: The objective of this study was to compare the proximal contact strength of class II resin composite restorations placed with different established and newly proposed placement techniques using tooth pressure meter. Methods: 105 ivorine lower left first molar teeth with standardized MO cavities were divided in seven groups (n=15). Teeth...
Conference Paper
Objectives: This study investigated the effect of polymerization shrinkage of low shrinkage composite, using two LED lights with different intensities, on proximal contact tightness of class II composite resin restorations. Methods: 40 Ivorine teeth with standardized MO cavity preparations were divided into 4 equal groups that were restored in a cl...
Article
Full-text available
To determine the relative hardness of GI-based restorative materials using both LED and QTH curing lights at different post-irradiation intervals. Four restorative materials (Z250, Beautifil, Dyract AP and Fuji II LC) with shade A3.5 were tested in conjunction with three LCUs (Astralis 3, Blue phase and Radii). The specimens were prepared using spe...
Conference Paper
Objective: To determine microtensile bond strength of ceramic and composite CAD-CAM blocks bonded to dentin and to composite material using self-adhesive and conventional resin cements. Methods: Occlusal surfaces of extracted sound human molars were sectioned horizontally below the DEJ to produce dentin sections 3mm thick. Composite discs 3mm thick...
Article
This investigation evaluated the effect of glass and polyethylene fiber inserts on the microleakage of Class II composite restorations with gingival margins on root surfaces. Fifty-four intact molars were sterilized with Gamma irradiation and mounted in acrylic bases. Class II slot cavities were made on both proximal sides of each tooth (3 mm wide,...
Article
The aim of this study was to determine the efficacy of new light-emitting diode (LED) curing units in the hardening of Class II composite restorations. Disk specimens 2 mm in diameter and 2.5 mm thick were prepared from 2 composites (Vit-l-escence, shade A3, Ultradent; Herculite XRV, shade A2, Kerr) in the following manner. An extracted permanent m...
Conference Paper
Purpose: Under the time constraints of private practice time recommendations by materials' manufacturers can be easily overlooked. The aim of this study was to investigate the effect of varying dentin priming time on its bond strength to composite resin using a self-etching bonding system. Methods: Crowns of sound, freshly extracted, sterilized hum...
Article
Clinical Relevance Compared to two other adhesives, a self-etch adhesive resulted in higher microtensile bond strength values when used to bond a resin composite to both sound and caries-affected dentin.
Article
Full-text available
To determine the intensity of quartz-tungsten-halogen light polymerization units in dental offices in El Salvador, Brazil. A team of researchers visited 100 offices in 2003. The team measured light intensity with a radiometer. The age and make of the units and the availability of light meters were recorded. One hundred twenty quartz-tungsten-haloge...
Article
Light units used for polymerization of resin composites are subject to deterioration with age, and frequent maintenance is required to maintain optimal efficacy. This study examined the efficacy of quartz-tungsten-halogen light units in private dental offices in Toronto for polymerization of resin composites. One hundred dental offices met all sele...
Article
The authors conducted a study to determine light intensity and heat/glare measurements of quartztungsten-halogen (QTH) light polymerization units used in dental offices. Research assistants visited 100 dental offices and assessed 214 QTH light units. They recorded each unit's model, age, service history, light intensity and heat/glare emissions. Me...
Article
Background: The effects of carbamide peroxide bleach on tooth structure are uncertain. Purpose: The purpose of this study was to investigate the effects of direct or indirect carbamide peroxide application on dentin flexural strength and modulus in vitro. Materials and Methods: Dentin bars were machined from bovine incisors and treated with 10% car...
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Full-text available
Contrary to the situation for amalgam restorations, obtaining acceptable proximal contacts with posterior composite restorations can be difficult. Proximal contacts that are less than ideal may permit food impaction and subsequent caries formation and periodontal problems. The aim of this study was to assess the quality of proximal contacts of post...
Article
The aims of this study were to measure cuspal deflection of premolars restored with bonded amalgam and to investigate bond resistance to thermo-cycling and cyclic loading. Strain gauges were used to measure cuspal deflection of maxillary premolars restored with MOD bonded amalgam restorations. A nondestructive method was used in which teeth were lo...
Article
This study investigated the degree of hardening achieved through self-curing only and through dual-curing a group of eight new resin-based cements. In addition, the effect of ceramic inlay thickness on cement hardness was determined. Disk specimens measuring 6 mm in diameter and 2.5 mm thick were prepared from eight cements: Adherence, Choice, Duol...
Article
Acidic fluoride gels have been found to significantly damage conventional glass-ionomer cements. In this study the effect to acidulated phosphate fluoride (APF) and neutral fluoride gels on the recently introduced resin-modified glass ionomers and a polyacid-modified composite resin (Variglass) was studied using scanning electron microscopy (SEM)....
Article
Dual-cure inlay resin cements polymerize both chemically and through light activation; however, clinically some aspects of the cement are not readily accessible to the light source. This study investigated the degree of cement hardening achieved through chemical curing only versus dual curing and the effect of inlay thickness on cement hardness. Di...
Article
The effect of home-use topical fluorides on the surface integrity of two glass ionomers and a composite was studied using SEM. Class V cavities prepared in extracted teeth were restored with two commercial glass ionomers and a composite. Teeth were randomly divided into groups and each group treated for 24 h with one of the following fluoride gels:...
Article
Full-text available
Fluoride release from a glass-ionomer cement was measured in vivo during an 8-day period. Maxillary acrylic resin appliances, each carrying four glass-ionomer cement specimens, were worn by four subjects at night. Unstimulated whole saliva samples were collected before the subjects retired to bed (pretreatment samples) and in the morning (posttreat...

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