Moataz F Elgezawi

• BDS,MDSc,DDSc
• Professor at Imam Abdulrahman Bin Faisal University

Objective: The aim of this in vitro investigation is to study the effect of endodontic cavity design on interfacial voids, class II resin composite sealing ability, and fracture resistance in mandibular premolars. Methods: A total of 48 single-rooted mandibular premolars received compound class II preparations with either traditional flare access c...

Statement of problem. Although bonding is important for long-term clinical success, studies on the bonding of additively manufactured ceramics are sparse. Purpose. The purpose of this in vitro study was to determine the influence of manufacturing methods, additive (LCM) versus subtractive (CAM). and ceramic materials, zirconia (ZrO 2) and lithium d...

Background: Esthetic anterior composite restorations are very challenging. They constitute a main part of the clinical practice of restoring teeth with resin composites. Distinctive variations in composite material selection and technique of application in anterior teeth exist when compared to the practice of restoring posterior teeth with resin co...

Introduction This study aimed to assess the current awareness and practices of resin composite light curing of general dental practitioners (GDPs) in Saudi Arabia and to set several evidence-based recommendations to improve the quality of the outcome of concern. Methods An online questionnaire was created. Two hundred and fifty email invitations w...

Background: Esthetic anterior composite restorations are very challenging. They constitutes a main part of the clinical practice of restoring teeth with resin composites. Distinctive variations in composite material selection and technique of application in anterior teeth exist when compared to the practice of restoring posterior teeth with resin c...

Purpose: To investigate the influence of immediate dentin sealing (IDS) vs delayed dentin sealing (DDS) on the marginal gaps of machinable monolithic zirconia vs pressable lithium disilicate laminate veneers. Materials and methods: A total of 40 maxillary lateral incisors were used and received butt-joint laminate veneer preparation. The samples...

This review addresses the rationale of recurrent and/or residual caries associated with resin composite restorations alongside current strategies and evidence-based recommendations to arrest residual caries and restrain recurrent caries. The PubMed and MEDLINE databases were searched for composite-associated recurrent/residual caries focusing on pr...

Objectives: This review article aims to describe some of the roles of Matrix metalloproteinases (MMPs) in enamel, dentine, dental caries, hybrid layer degradation, pulp and periodontal tissues, throwing light on their current inhibitors. The article addresses the potential of MMPs to serve as biomarkers with diagnostic and therapeutic value. Design...

Objective: The aim of this study was to evaluate the current clinical practice of general dentists in Saudi Arabia in restoring class II cavities using direct resin composites and to set evidence-based practice recommendations of concern. Methods: An online survey formed of 20 questions and classified into four domains was developed. 500 dentist...

Background: This study aimed to assess the current awareness and practices of resin composite light curing of general dental practitioners (GDP) in Saudi Arabia. Methods: A population of 250 general dentists appointed in non-university governmental hospitals in five main cities in Saudi Arabia was targeted with a sample size of 152 at 95% power. 25...

Objectives: Upon initial proximal wall construction, the favorable C-factor of class-II cav- ities may become unfavorable. This study investigated the application method on bulk-fill resin composite polymerization shrinkage. Methods: Occluso-proximal class-II cavities were prepared in 40 molars and bonded with a self-etch adhesive (Adhese Universal...

Bulk-fill composites are increasingly used in stress-bearing areas in posterior teeth, with a diversity of reports concerning their effectiveness and clinical reliability. The objective of this randomized clinical control study was to investigate the effectiveness of bulk-fill versus veneered bulk-fill Class II composite restorations. A double-blin...

Objectives This investigation evaluated the effect of flowable liners beneath a composite restoration applied via different methods on the pattern of shrinkage vectors. Methods Forty molars were divided into five groups ( n = 8), and cylindrical cavities were prepared and bonded with a self-etch adhesive (AdheSe). Tetric EvoCeram Bulk Fill (TBF) w...

Objectives Sufficient depth of cure allows bulk-fill composites to be placed with a 4-mm thickness. This study investigated bulk versus incremental application methods by visualizing shrinkage vectors in flowable bulk-fill and conventional composites.Materials and methodsCylindrical cavities (diameter = 6 mm, depth = 4 mm) were prepared in 24 teeth...

Bulk-fill composites can be placed at a thickness of 4 mm due to their sufficient depth of cure. The aim of this study was to investigate the effects of bulk versus incremental application methods on the shrinkage vectors and the percentage of volumetric polymerization shrinkage of the composites. Twelve molars were divided into three groups (n = 4...

Purpose The coronavirus disease 2019 (COVID‐19) pandemic has significantly challenged dental education. This study investigated the procedures outlined by dental faculty members to maintain quality dental education in a safe bioenvironment and adequately control the risk of cross‐infection Method Dental educators from dental schools around the wor...

Currently, the principal strategy for the treatment of carious defects involves cavity preparations followed by the restoration of natural tooth structure with a synthetic material of inferior biomechanical and esthetic qualities and with questionable long-term clinical reliability of the interfacial bonds. Consequently, prevention and minimally in...

Objectives Bond strength to enamel and dentin depends on the bonding approach or condition. This study investigated the effects of the boundary conditions, in terms of the bonding substrate and the bonding condition, on the shrinkage vectors of a flowable composite. Materials and methods An experimental cylindrical cavity (diameter = 6 mm, depth =...

Statement of problem: Data for the color stability of dual-polymerized and light-polymerized resin cements used in esthetic dentistry are lacking. Purpose: The purpose of this in vitro study was to evaluate the color stability of 4 types of composite resin cements after water aging. Material and methods: Specimens (n=30) of each resin cement (...

Objective: The objective of this study was to investigate the effects of cavity configuration on the shrinkage vectors of a flowable resin-based composite (RBC) placed in occlusal cavities. Materials and methods: Twenty-seven human molars were divided into three groups (n = 9) according to cavity configuration: "adhesive," "diverging," and "cyli...

Chronic degradation of hybrid layer collagen by matrix metalloproteinases (MMPs) jeopardizes resin-dentin interfacial integrity and limits the durability of dental restorations. The 4-point bending strength (BS) is a valid but uncommon method of testing the mechanical behavior of resin-dentin interfaces. The present study aims to analyze the influe...

Polymerization shrinkage of dental resin composites leads to stress build-up at the tooth-restoration interface that predisposes the restoration to debonding. In contrast to the heterogeneity of enamel and dentin, this study investigated the effect of boundary conditions in artificial cavity models such as ceramic and Teflon. Ceramic serves as a ho...

Objective: To improve the confidence of the final year dental students in completing occlusal and oral rehabilitation of patients, with complexities beyond their scope, based on full analysis of the biomechanical and esthetic considerations of each case. Material & methods: Two comprehensive patient situations presenting with special difficulties i...

This study investigated the color stability and microhardness of five composites exposed to four beverages with different pH values. Composite discs were produced (n=10); Filtek Z250 (3M ESPE) and Filtek P90 (3M ESPE) were applied in two layers (2 mm, 20 seconds), and Tetric N-Ceram Bulk Fill (TetricBF, Ivoclar Vivadent) and SonicFill (Kerr) were a...

Composite restorations are widely used worldwide, but the polymerization shrinkage is their main disadvantage that may lead to clinical failures and adverse consequences. This review reports, currently available in vitro techniques and methods used for assessing the polymerization shrinkage. The focus lies on recent methods employing three-dimensio...

Bulk-fill composites have been introduced to facilitate the placement of deep direct resin composite restorations. This study aimed at analyzing the cervical marginal integrity of bulk-fill vs incremental and open-sandwich class II resin composite restorations after thermomechanical cycling using replica scanning electron microscopy (SEM) and ranki...

Cervical interfacial bonding quality has been a matter of deep concern. The purpose of this study was to analyze microtensile bond strength (MTBS) and cervical interfacial gap distance (IGD) of bulk-fill vs incremental-fill Class II composite restorations. Box-only Class II cavities were prepared in 91 maxillary premolars (n = 7) with gingival marg...

Objectives: As bonding to enamel is stronger than bonding to dentin, the aim of this study was to determine enamel’s influence as a bonding substrate on the direction of shrinkage vectors.Methods: 36 human teeth were divided into 4 groups (n=9); first, according to the cavity form into experimental (EXP) and cylindrical (CYL) groups, then subdivide...

Objectives: Sufficient depth of cure allows bulkfill composites to be placed in 4mm thickness but little is known about its shrinkage vectors. The aim of this study was to investigate shrinkage vectors in the bulkfill restorative material Smart Dentin Replacement (SDR, Dentsply). Methods: 16 teeth were divided into two groups (n=8): SDR-bulk (SB)...

Objective: To evaluate the effect of two concentrations of home bleaching agents on color stability and surface integrity of two nano-hybrid bulkfill composites. Method: 60 composite discs were produced (n=10, diameter=7mm, thickness=4mm) from two materials, Tetric EvoCeramBulk Fill (ECB) (Ivoclar-Vivadent, Liechtenstein) and SonicFill (SF) (...

Objective: To study color stability and surface integrity of five resin-based composites exposed to four beverages of different pH-values. Method: 200 composite discs were produced (n=10, diameter=7mm, thickness=4mm); in group-Filtek-Z250 (Z250) (3M-ESPE, USA), and group-Filtek-P90 (P90) (3M-ESPE), 2 layers (2mm, 20s) were used. In group-Tetric...

Objective: To analyze the cervical marginal-integrity of bulk-fill versus incremental and open-sandwich class-II aged resin-composite restorations using replica-SEM and simulation of clinical-evaluation employing FDI-criteria. Method: Box-only class-II cavities were prepared in 91 maxillary premolars with gingival-margin placed on each side (...

Objective: To assess MTBS and failure-mode at cervical interfaces of bulk versus incremental-fill and open-sandwich class-II aged resin-composite restorations. Method: Box-only class-II cavities were prepared in 91 maxillary premolars with gingival-margin placed on each side (1mm above and below CEJ). 84 maxillary premolars were divided acc...

Objective: To visualize the polymerization shrinkage of a light-initiated resin-composite in form of displacement vector fields (DVF) and to detect the shrinkage direction and patterns in a silanized ceramic-cavity in relation to light-source. Method: A cylindrical cavity (diameter 6mm, depth 3mm, n=9) was prepared into a ceramic block, (IPS Empre...

Purpose: This in vitro investigation was performed to assess microleakage and cusp fracture resistance of maxillary premolars specimens involving composite resin direct restorations and ceramic inlay restorations. Material and methods: Specimens were tested after artificial aging provoked by thermal and occlusal load cycling. For that purpose, 66 e...

Objective: The purpose of this in-vitro study was to assess cervical marginal microleakage at enamel and non-enamel levels in maxillary premolars with bonded MOD-restorations after artificial aging by thermal and occlusal load cycling. Methods: 24 maxillary premolars were divided (n=12) according to location of the preparation's proximal gingival...

ABSTRACT The purpose of this in vitro study was to investigate the sealing performance (microleakage) of different glass ionomer formulations and to measure their wear rate. For microleakage assessment, a total of 120 class V cavities were prepared in upper and lower premolars and were used in this in- vestigation. The cavities were divided into tw...