Hamdi H. H. Hamama

Mansoura University · Operative Dentistry

Objective White spot lesions are initial sign of enamel caries that compromise esthetic appearance following orthodontic treatment. Thus, the systematic review was conducted to evaluate the remineralization potential of orthodontic adhesives on early-enamel lesions surrounding orthodontic bracket. Methods Search strategy was performed through thre...

Objectives To evaluate and compare the ion-releasing capability of three different restorative systems at the restoration/tooth interface elemental analysis using energy-dispersive X-ray technique. Additionally, micromorphological patterns of the restoration/tooth interfaces was investigated. Materials and methods Eighteen freshly extracted sound...

Background The pre-polymerization temperature of resin composite restorative materials could influence their adaptation to cavity details. As a current debate is existing about the refrigeration of resin composite restorative materials, this study was designed to assess the effect of refrigeration of 3 types of resin composite restorative materials...

Background Virtual Reality (VR) has been widely used as an useful educational tool in modern dentistry and is considered as an alternative training tool adjunct to conventional training methods. Objective This study was designed to investigate the effectiveness of VR haptic-enhanced simulators for training undergraduate dental students during prac...

Background This study was conducted to compare chemical, elemental and surface properties of sound and carious dentin after application of two restorative materials resin-modified glassionomer claimed to be bioactive and glass hybrid restorative material after enzymatic chemomechanical caries removal (CMCR) agent. Methods Forty carious and twenty...

Objective The aim of this study was to assess and compare the impact of bulk-fill flowable resin composite liners (BFFL) on the 2-year clinical performance of bulk-fill ormocer (BORC) in comparison to methacrylate-based resin composites (BMRC) in Class II cavities. Materials and Methods Thirty participants, each aged between 18 and 30 years, were i...

Objective To evaluate the effect of various surface coating methods on surface roughness, micromorphological analysis and fluoride release from contemporary resin-modified and conventional glass ionomer restorations. Materials & methods A total of 72 permanent human molars were used in this study. The teeth were randomly assigned into 2 groups acc...

To investigate the in vivo and in situ effect of different types of lasers in prevention of enamel demineralization in high caries risk cases (around orthodontic brackets, around restoration and in caries susceptible pits and fissures). PubMed was searched using the following keyword sequence; (Laser therapy OR laser irradiation OR laser applicatio...

Objectives: Our objective was to evaluate the effectiveness of techniques and pulp-capping materials used to maintain pulp vitality in extensively carious lesions. Materials and Methods: We conducted an electronic search to collate studies published from 2009 to 2019 that showed clinical and radiological success of pulp-capping materials after remo...

To evaluate the impact of using ion-releasing liners on the 3-year clinical performance of posterior resin composite restorations after selective caries excavation with polymer burs. 20 patients were enrolled in this trial. Each patient had two deep carious lesions, one on each side of the mouth. After selective caries removal using polymer bur (Po...

This manuscript introduces a new method for teeth numbering system. The primary rationale of lunching this system was to solve previous numbering systems' drawbacks. Furthermore, to keep simplicity and ease of reading and inputting data. The outcome of a questionnaire disseminated among 66 personnel showed the confusion existing among currently use...

Objectives This randomized clinical trial evaluated and compared the 2-year clinical performance of two ion-releasing bulk-fill composites (Cention N and Surefil One) with that of a conventional bulk-fill resin composite (Powerfil) in Class I and II cavities. Methods Thirty-two patients, each with 3 Class I and/or Class II cavities under occlusi...

Objectives This study was conducted to evaluate the effect of ethanolic extract of propolis on antibacterial and microshear bond strength of glass ionomer restorations to dentin. Materials and methods Conventional glass ionomer cement (Equia forte, GC Tokyo, Japan), resin-modified glass ionomer (Fuji II LC, GC Tokyo, Japan) and propolis powder (d...

The objective of this study was firstly to assess the demineralization inhibitory effect of ion-releasing restorations in enamel adjacent to restoration using a biofilm caries model and secondly to compare the effect to that in a chemical caries model. Fifty-six bovine incisors were filled with either Surefil one (SuO), Cention N (CN) (both ion-rel...

This comparative study was conducted to assess the intramedullary bone tissue reaction of an ion-releasing resin modified glass-ionomer cement with claimed bioactivity (ACTIVA bioactive resin) restorative material versus Mineral Trioxide Aggregate High Plasticity (MTA HP) and bioceramic putty iRoot BP Plus. Fifty-six adult male Wistar rats were ass...

Objective: To evaluate cuspal deflection of mesio-occluso-distal (MOD) cavities restored with short fiber-reinforced composite. Materials and Methods: Two different commercially available composite resin restorations; short fiber-reinforced (ever X Posterior GC, Tokyo Japan) and conventional micro-hybrid (G-aenial universal resin composite GC, Toky...

Purpose: To evaluate the bonding interface and the remineralization potential of a bioactive restorative material on demineralized dentin compared to a conventional bulk-fill resin composite restoration. Methods: Twelve caries-free human molars were used in this study. Specimens were randomly divided into two groups according to the type of rest...

Background: The pre-cure temperature is considered an important parameter that affects the polymerization kinetics and the properties of composite restoration. As dissension exists about the effect of storing composite restorative materials in refrigerator, this study aimed to assess the effect of shelf-storage temperature on degree of conversion...

Background: Evaluating the effect of different surface treatment methods on the micro-tensile bond strength (µTBS) of two different resin-matrix computer-aided design/computer-aided manufacturing (CAD/CAM) ceramics (RMCs). Methods: A standardized inlay preparations were performed on 100 intact maxillary premolars. According to the type of the re...

This systematic review was aimed to evaluate occurrence of secondary caries and marginal adaptation in ion-releasing materials versus resin composite. Electronic search of PubMed, Scopus, and Open Grey databases with no date or language restrictions until May 21st, 2021, was conducted. Randomized clinical trials that compared ion-releasing restorat...

Objectives The aim of this study was to comparatively evaluate microshear bond strength (μSBS) of bioactive ionic resin composite and resin-modified glass ionomer liner (RMGI) to dentin and resin composite. Materials and Methods The enamel of 11 posterior molar teeth was removed to expose dentin and then placed in acrylic blocks. Each specimen rece...

Objective: To investigate and compare the impact of pre-heating of an ormocer-based and a methacrylate-based restorative materials at different temperature on intra-pulpal temperature with that at room temperature. Materials and Methods: In the current study, two bulk-fill composite systems; one ormocer-based, and one methacrylate-based were used a...

Objective: The aim of the current study is to evaluate the remineralization potential of experimental tricalcium silicate (TCS) paste in comparison with more popular remineralizing agents like silver diamine fluoride potassium iodide (SDF-KI) and casein phosphopeptide amorphous calcium phosphate (CPP-ACP) on early enamel lesions. Materials and me...

To evaluate the remineralization potential of prepared tricalcium silicate (TCS) paste compared to silver diamine fluoride-potassium iodide (SDF-KI) and casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) on artificial enamel lesions. Thirty permanent sound molars were collected for the study. After cleaning, root cutting, and applying acid...

Objective: this study was carried out to assess the effect of different caries prevention protocols on salivary flow in high caries risk patients. Materials and methods: 66 participants were involved in the study (n=22). All of them were considered as high-risk participants. They were randomly divided into three groups according to a proposed carie...

Objective the purpose of this study was to assess the effect grape seeds mouthwash on plaque accumulation in high caries risk individuals. Materials and methods: 66 students were recruited in the study. All students were high caries risk patients. They were divided into three groups according to the protocol they followed for one year. Plaque score...

Objective To evaluate clinical performance of the new CAD/CAM resin-matrix ceramics and compare it with ceramic partial coverage restorations. Materials and methods An electronic search of 3 databases (The National Library of Medicine (MEDLINE/PubMed), Scopus, and the Cochrane Central Register of Controlled Trials) was conducted. English clinical...

Microleakage is a major factor contributing in the occurrence of secondary carious lesions around restorations. This study aimed to evaluate the microleakage around class V restorations using different restorative materials. In this in vitro study, 32 standardized class V cavities were prepared on buccal and lingual surfaces of 16 human teeth (extr...

Background: This study evaluated the ability of a CPP-ACP-modified GIC to inhibit demineralization around the margin of cervical cavities in natural teeth in comparison with a Giomer and conventional GIC with and without coating. Methods: Thirty-two sound human molars were used. Box-shaped cavities were prepared along the CEJ. Teeth were randoml...

The objective of this study is to compare the estimated values of remaining dentin thickness (RDT) recorded by a newly introduced electrical impedance device (Prepometer) with cone beam computed tomography (CBCT) and histological in situ measurement. A total number of thirty human molars were used in this study. A deep class I cavity was prepared....

Background Endodontic surgical procedures, when performed, require retrograde filling materials that are biocompatible, non-toxic, non-irritant, dimensionally stable, and ideally promote bone formation. Precise evaluation of retrograde filling materials in clinical trials is necessary to give holistic view for properties of material and potential o...

Silver diamine fluoride (SDF) was developed in Japan in the 1960s. It is a clear solution containing silver and fluoride ions. Because of its anti-bacterial and remineralizing effect, silver diamine fluoride has been used in managing dental caries for decades worldwide. This paper aims to summarize and discuss the global policies, guidelines, and r...

The aim of this study was to describe the changes in oral health policies and guidelines in response to the Coronavirus disease 2019 (COVID-19) pandemic in different countries and regions around the world. Information on oral health policies and guidelines from 9 countries (Canada, China including Hong Kong, Egypt, India, Japan, New Zealand, Nigeri...

Microleakage is a major factor contributing in the occurrence of secondary carious lesions around restorations. This study aimed to evaluate the microleakage around class V restorations using different restorative materials. In this in vitro study, 32 standardized class V cavities were prepared on buccal and lingual surfaces of 16 human teeth (extr...

Objectives The present study aimed to evaluate the effect of restoration thickness, CAD/CAM material, and 6 months of artificial saliva storage on the fracture resistance of occlusal veneers. Materials and methods A total of 84 intact maxillary molars were sectioned 4.0 mm occlusal to the cementoenamel junction to expose the dentine. The teeth wer...

Objective: The objective of this review was to evaluate the effect of non-thermal atmospheric plasma (NTAP) on adhesives resin-dentin micro-tensile bond strength (μTBS) in previously published studies. Methods: Electronic search was conducted using the Medline, Cochrane library, and Scopus databases. The included studies were laboratory studies...

Aim This laboratory study aimed to investigate the effects of three endodontic biomaterials; MTA‐HP, iRoot‐BP‐Plus and ACTIVA on the proliferation, adhesion, and osteogenic differentiation of human Dental Pulp Stem Cells (hDPSCs). Methodology The hDPSCs were isolated from the dental pulps of 21 patients seeking surgical extraction of their impacte...

Objectives To evaluate the surface roughness and gloss of three nanohybrid resin composites after polishing with three different polishing systems. Materials and Methods A total number of 112 disc specimens (10 × 3 mm) were prepared from nanohybrid—Empress Direct (ID), Grandio (GR), Filtek Z550 (ZN) and a microhybrid resin composite restorative mat...

The paradigms of contemporary caries management have shifted to minimal intervention dentistry. Conservative restorative procedures are recommended to replace the complete removal of all carious tissues in the management of dental caries. This article reports two clinical cases of conservative restorations of proximal caries. Different conservative...

Objective: The purpose of this systematic review was to summarize scientific evidence that evaluates in vitro fracture and fatigue strength of occlusal veneers in different thicknesses, CAD/CAM materials, and under different aging methodologies. Materials and methods: An electronic search of 3 English databases (The National Library of Medicine (ME...

Objectives: Objectives: The aim of this review was to assess the clinical performance of different retrograde fillings used in previously published prospective randomized clinical trials Methods: Methods: An electronic search was performed using Web of Science and PubMed databases. The following categories were excluded during the assessment proce...

Objectives: To evaluate caries excavation time, chemical and morphological changes of the excavated dentine surface following caries excavation with sodium hypochlorite-based chemomechanical caries removal systems. Methods: A total number of 40 human molars exhibited moderate caries (ICDAS 5) were used in the current study. The selected molars were...

Objectives: To evaluate efficiency of using potassium containing products for treatment of dentin hypersensitivity Methods: An online research on “PubMed” and Scincedirect was performed using the keywords “Dentin hypersensitivity “ and/or”potassium nitrate “ and/or “potassium oxalate “ The included studies in this review were English-written studie...

The aim of this study was to investigate the outcomes of direct pulp capping performed with two types of tricalcium silicate‐based materials (mineral trioxide aggregate/MTA and Biodentine/BD); nano‐hydroxyapatite (nHAP) crystals or calcium hydroxide (CH) in dogs. Following mechanical exposure, the pulps were randomly capped with one of the four mat...

Objectives: New technologies, such as social media and mobile applications, have changed the learning environment by providing students access to a vast amount of information which can be downloaded at any time or location. Whilst these developments have largely had a positive impact on teaching within medical/dental schools, concerns have been rai...

Abstract Background The purpose of this in vitro study is to compare the antimicrobial effect and pH of two calcium silicate cements Mineral trioxide aggregate high plasticity (Angelus PR, Brazil) and iRoot BP Plus (BioCeramix Inc., Vancouver, BC, Canada) and new bioactive restorative resin composite restorative material (ACTIVA, MA, Pulpdent, USA)...

Background The purpose of this study was to compare the biocompatibility of three bioactive materials, namely ACTIVA bioactive restorative resin composite, iRoot BP plus and Mineral Trioxide Aggregate (MTA) Angelus-HP. Methods Seventy-five Wistar male rats were subjected to subcutaneous implantation of four polyethylene tubes; one empty tube was u...

In the past two decades, dental posterior resin composites have been comprehensively developed to fulfill patients’ high aesthetic demands. Mechanical properties of resin composites have improved significantly in the past 5 years. Despite this, of the continuously developing procedures, polymerization shrinkage is still the major “inherited” drawba...

This study was designed to test the hypothesis of that students who receive virtual reality training prior to practicing on natural teeth exhibit high self-confidence levels compared to their peers who receive post-practice VR training. The Null-hypothesis is that Virtual reality training cannot totally replace the ‘traditional’ cariology teaching...

Objectives The aims of this study were to conduct a systematic review of the microtensile bond strength (µTBS) of multi-mode adhesives to dentin and to perform a meta-analysis to assess the significance of differences in the µTBS of one of the most commonly used universal adhesives (Scotchbond Universal, 3M ESPE) depending on whether the etch-and-r...

Objectives The aim of this systematic review was to critically analyze previously published studies of the effects of dentin surface pretreatment with deproteinizing agents on the bonding of self-etch (SE) adhesives to dentin. Additionally, a meta-analysis was conducted to quantify the effects of the above-mentioned surface pretreatment methods on...

Objectives: To conduct a micromorphological and elemental analysis of the hybrid-like layer at the calcium silicate-based restoration /dentine interface. Methods: A total of 10 carious molars exhibiting cavitated occlusal dentinal lesions (ICDAS 5) were used. Soft carious tissue was excavated using a papain-based chemomechanical caries removal agen...

Introduction: The majority of Black’s principals are no longer applicable in restorative field, hence, it is mandatory to update our dental schools undergraduate curricula to accommodate the revolutionary changes in dental scientific evidence Objectives: To present the effect of incorporating updated cariology principals in the undergraduate curric...

Objectives: The aim of this study is to evaluate the microtensile bond strength (µTBS) of different MDP-containing universal adhesives to dentin. Methods: A total of thirty-six freshly extracted caries-free human permanent molars were divided into six groups according to type of adhesive and etching mode employed which is either etch-and-rinse (ER...

Objectives: To evaluate the micromorphology of calcium silicate-based restorative material/dentine and CPP-ACP modified glass ionomer/dentine interfaces. Also, this study was designed to investigate the effect dentine-surface treatment using poly acrylic acid (conditioner) on the bonding of calcium silicate-based restorative material to dentine. M...

Objectives: The aim of this systematic review was to evaluate the microtensile bond strength (µTBS) of multi-mode adhesives to dentin. Also to conduct a meta-analysis to quantify the differences in mean µTBS in previously published manuscripts for Scotchbond Universal adhesive (3M Espe, st. Paul, MN, USA). Methods: An electronic search was perform...