
Ahmed Abdel Rahman HashemAin Shams University · Endodontic dept.Faculty of Dentistry
Ahmed Abdel Rahman Hashem
BDS, MSc, PHD
About
46
Publications
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Introduction
Publications
Publications (46)
To evaluate the effect of combining different bioactive root-end filling materials with composite bone graft (xenogeneic mixed with autogenous bone fragments) on the healing process of periapical tissues after endodontic micro-surgery procedure. In this triple-blinded clinical trial, 56 patients were divided into 2 main groups (28 each) according t...
Aims
The present study aimed to evaluate the antibacterial effectiveness of newly formulated root canal irrigants derived from natural sources. In particular, this study investigated how these irrigants’ antimicrobial properties were affected by gamma radiation activation.
Materials and Methods
Fifty-three single-rooted extracted human teeth with...
Objective
To evaluate histologically and radiographically the potential of dog’s immature roots with apical periodontitis to regenerate after regenerative endodontic treatment using mesoporous silica nanoparticles (MSNs) with/without bone morphogenic protein (BMP-2) as scaffolds.
Methods
In 4 mongrel dogs, 56 immature teeth with 96 roots were infe...
Objectives
Effective disinfection of the root canals is the cornerstone of successful endodontic treatment. Diminishing the microbial load within the root canal system is crucial for healing in endodontically treated teeth. The aim of this study was to evaluate the effect of 2780 nm Er,Cr:YSGG and 940 nm diode lasers on the eradication of microorga...
Objective
The pulpal response to Hoffmann’s Pulpine mineral (PMIN) and Pulpine NE (PNE) was compared to mineral trioxide aggregate (MTA) when used as pulpotomy materials in immature permanent teeth in dogs.
Materials and methods
Immature premolars were randomly divided according to the observation period into three equal groups (n = 24) (10 days,...
The term ‘endodontic-periodontal’ (endo-perio) lesions has been used to describe lesions that involve the pulp and periodontal tissues either in a separate or a combined pattern. The diagnosis, management, and prognosis of teeth with endo-perio lesions are challenging for the clinician. The complexity of endo-perio lesions reflects the close develo...
This study compares the immunohistochemical reaction of a new experimental tricalcium silicate perforation repair material to mineral trioxide aggregate (MTA) and Biodentine. A total of 162 mature premolar teeth from 12 dogs were divided into three experimental groups (n = 54 teeth each) according to the evaluation period: 1, 2 and 3 months. Each g...
Objective
The aim of the present study was to evaluate the regenerative potential of permanent necrotic mature teeth with different apical foramen diameters in comparison to conventional endodontic treatment.Methods
Pulp necrosis and periapical pathosis were induced in premolars (144 roots) in six mongrel dogs. The infected teeth were divided into...
Aim
To examine the efficacy rate of four anaesthetic protocols in mandibular first molars with symptomatic irreversible pulpitis (SIP).
Methodology
One-hundred-sixty patients with a SIP diagnosis were included in this randomized clinical trial. Patients were randomly allocated into 4 treatment groups (N=40) according to the administered technique:...
Adequate understanding and accurate characterization of normal and unusual root and canal morphology are essential requirements for successful root canal treatment. A new coding system for classifying root and canal morphology, accessory canals and anomalies has been introduced. In addition to technological advances related to experimental studies...
This study aimed to assess regenerative treatment protocols for maturogenesis of immature teeth with apical periodontitis in dogs. Apical periodontitis was induced in immature premolars of 8 mongrel dogs teeth that were divided into 5 groups; Regeneration via blood clotting (REG group); Chitosan loaded with Demineralized bone matrix (REG-CD group);...
This study compared the Biodentine (BD) and MTA in repair of furcation perforation (FP) in a dog model in terms of inflammatory cell count and new hard tissue formation through histological and immunohistochemical evaluations. Ninety six teeth in six adult mongrel dogs were divided according to the time of repair into two groups (48 teeth/3 dogs ea...
Objectives
This study was to evaluate the antibacterial effect of different instrumentation and irrigation techniques using confocal laser scanning microscopy (CLSM) after root canal inoculation with Enterococcus faecalis (E. faecalis).
Materials and Methods
Mesiobuccal and mesiolingual canals of extracted mandibular molars were apically enlarged...
Introduction
Postoperative pain is one of the primary problems in endodontic therapy and an unpleasant situation for both patient and clinician.
Purpose
The aim of this Study was to assess degree of Post-Operative Pain after Endodontic Treatment done using two different instrumentation techniques with combination of two different sealers.
Materia...
Supernumerary teeth are developmental anomalies that might require endodontic treatment for functional and/or aesthetic reasons. A review of the literature was conducted using appropriate key words (Supernumerary’ OR ‘Supplemental’ OR “Rudimentary” AND ‘Tooth’. ‘Mesiodens’ OR ‘Paramolar’ OR ‘Distomolar’).in major endodontic journals (Australian End...
Thorough knowledge and meticulous understanding of the root canal anatomical variations is essential for successful root canal treatment. Mandibular molar teeth show considerable variations in their external and internal radicular morphology that require special attention from dental practitioners to provide the best clinical outcomes for the patie...
Anterior teeth may have aberrant anatomical variations in the roots and root canals. Root dilaceration
is an anomaly characterized by the displacement of the root of a tooth from its normal alignment with
the crown which may be a consequence of injury during tooth development. This report aims to present
a successful root canal treatment of a maxil...
This work evaluates the effect of mineral trioxide aggregate (MTA), platelet rich plasma (PRP) or platelet rich fibrin (PRF) on healing of non-contaminated and contaminated furcation perforations. A total of 192 teeth of 12 dogs was divided into three equal groups according to evaluation period. Each group was further subdivided into MTA, PRP, PRF,...
Anterior teeth may have aberrant anatomical variations in the number of roots and root canals. A review of the literature was conducted using appropriate key words in major endodontic journals to identify the available reported cases as well as experimental and clinical investigations on accessory roots and root canals in anterior teeth. After retr...
The aim of this work was to evaluate the healing of furcation perforation following treatment with Mineral Trioxide Aggregate (MTA) and BioAggregate by histologic examination. The present study was carried out on a total of 72 premolar teeth from 6 adult mongrel dogs. Under general anesthesia, furcation perforation was carried out by using a round...
Regenerative endodontics is a promising alternative treatment for immature teeth with necrotic pulps. The present study was performed to assess the regenerative potential of young permanent immature teeth with necrotic pulp after the following treatment protocols: (1) a mineral trioxide aggregate (MTA) apical plug, (2) the regenerative endodontic p...
The aim of this study was to test the hypothesis that the expression of matrix metalloproteinase (MMP)-9 is significantly elevated in patients with symptomatic apical periodontitis and to correlate this with the detected amount of gram-negative bacteria.
Twenty-six patients with periapical lesions involving at least 2 teeth were included in this st...
Aim:
To assess the regenerative potential of immature teeth with necrotic pulps following revascularization procedure in dogs.
Methodology:
Necrotic pulps and periapical pathosis were created by infecting 108 immature teeth, with 216 root canals in nine mongrel dogs. Teeth were divided into three equal groups according to the evaluation period....
Purpose:
To compare the push-out bond strength of a new glass fiber root canal filling material to that of Resilon/ Epiphany, EndoREZ, and gutta-percha/AH Plus root canal filling materials.
Materials and methods:
Sixty roots were randomly divided into four groups (n = 15) according to the obturation material: group 1, Resilon/Epiphany (RE) (Pent...
A great number of nickel-titanium (NiTi) rotary systems with noncutting tips, different cross-sections, superior resistance to torsional fracture, varying tapers, and manufacturing method have been introduced to the market. The purpose of this study was to evaluate and compare the effect of 4 rotary NiTi preparation systems, Revo-S (RS; Micro-Mega,...
Introduction: Numerous methods have been proposed to remove fractured instruments from
within root canals with varying degrees of success. The aim of this study was to investigate the
effect of using three ultrasonic tips with different designs and materials on the fracture resistance
of curved roots after ultrasonic removal of fractured instrument...
The aim of this study was to compare the effect of acidic environment on the dislodgement resistance of mineral trioxide aggregate (MTA) and Bioaggregate (Innovative BioCeramix, Vancouver, Canada) when used as perforation repair materials.
Eighty, human, mandibular molars were used. Perforations were made in the furcation of each molar and enlarged...
The aim of this study was to evaluate the effect of different irrigation protocols on the push-out bond strength of EndoREZ root canal obturation system to root canal dentin and to determine the mode of bond failure that have occurred after dislodgment of the filling material.
A total of 60 human permanent single rooted teeth were used in this stud...
Different techniques and irrigant delivery devices have been proposed to increase the flow and distribution of irrigating solutions within the root canal system. The aim of this study was to compare smear layer removal after final irrigant activation with apical negative pressure (ANP), manual dynamic agitation (MDA), and passive ultrasonic irrigat...
The bond strength of ActiV GP root canal filling system and gutta-percha/AH plus sealer when used after final rinse with different irrigation protocols was evaluated in this study. Forty roots were randomly divided into four groups (n = 10) according to the final irrigation regimen: group 1, 5 mL 17% EDTA; group 2, 5 mL 17% EDTA followed by 5 mL 2%...
The ability of two mineral trioxide aggregate (MTA) compounds and Intermediate Restorative Material (IRM) to seal large furcation perforations were evaluated using a dye-extraction leakage method. The furcation perforations were repaired with and without the use of internal matrix before placement of repair material. Eighty extracted human mandibul...
The effect of 2 ultrasonic tips and power settings on temperature rise of external root surface was investigated during ultrasonic vibration of intracanal broken instruments. Thirty maxillary human central incisors had lingual coronal access. The apical 5 mm of size 40 K-files was separated at apical region. Two thermocouples connected to digital t...
The objective of the present study was to evaluate the sealing ability of a new resin obturating material "EPIPHANY". Sixty-four human extracted teeth representing the experimental and the control samples had their root canals cleaned and shaped. The sixty experimental teeth were divided into six groups where three groups were obturated using gutta...