Moustafa N AboushelibAlexandria University | AU · biomaterials
Moustafa N Aboushelib
PhD cum laude
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119
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Introduction
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Publications
Publications (119)
Introduction
Ceramic veneers are considered one of the most essential demands in dental aesthetics. It provides high accuracy and efficiency in restoring tooth shape, shade, form, and function. Preparation design is considered a critical factor in the success of dental veneers, as it influences the failure load and fatigue survival of posterior min...
Background
Recent forms of translucent zirconia material have been developed, offering a wide range of options and varieties for enhancing aesthetics, making it a preferred choice in the field of prosthetic dentistry. However, there is insufficient understanding regarding the recent types of zirconia materials and their optical behavior. Understand...
Background
Impressions that maintain their dimensional stability after autoclaving effectively control cross-infection and contamination resulting from a patient's oral secretions.
Purpose
The study aimed to assess the dimensional stability of autoclavable polyvinyl siloxanes after disinfection and sterilization.
Methods
A stainless steel metal m...
Introduction
Oro‐control communication is one of the complications associated with dental extraction and oral surgeries. This case report presents a minimally invasive surgical approach for bone regeneration at the site of oro‐antral communication utilizing a prefabricated computer‐aided design and computer‐aided manufacturing (CAD‐CAM) allogenic b...
Objectives: to enhance initial stability of dental implants placed in compromised bone defects with poor initial stability using a modified fixation technique.
Methods: Two osteotomy defects (6 mm and 4 mm in diameter) were made in the femur of a dog model. Dental implants (4 mm in diameter and 10 mm in length) were placed in the two defects. Micro...
The treatment of oral squamous cell carcinoma (OSCC) includes systemic chemotherapy and is associated with aggressive side effects on patients. This study evaluated a new intra-tumor-targeted drug delivery method for the treatment of OSCC induced on the dorsum of the tongue in white mice. The induced tumors were examined by needle biopsy. A targete...
Objective:
Restoring large boney defects using bone grafts alone is an unpredictable procedure. Biodegradable polymeric scaffolds suffer rapid biodegradation and lack sufficient osteo-conductivity. The aim of this study was to histomorphometrically evaluate three-dimensional printed graphene oxide-enriched poly(ε-caprolactone) (PCL) scaffolds for...
Objectives:
The aim of this study was to fractographically examine clinically fractured fixation screws used to fix implant supported restorations and to estimate stress at failure.
Methods:
20 clinically fractured titanium implant fixation screws were collected and analyzed under scanning electron microscope in order to locate critical crack or...
Background
Mechanical surface treatments can deteriorate the mechanical properties of zirconia. This study evaluated and compared the biaxial flexural strength, fracture toughness, and fatigue resistance of high translucency (HT) to low translucency (LT) zirconia after various mechanical surface treatments.
Methods
Four hundred eighty zirconia dis...
OSCC occupies more than 90% of all head and neck cancers and ranked the six most common malignant tumors worldwide. Main risk factors responsible for its occurrence were continuous exposure of alcohol, tobacco, infection of human papillomavirus and betel nut chewing. The main reason for failure to responding to available therapies was the late diag...
Introduction:
The objective of the current study was to develop a human treated dentin matrix (hTDM) hydrogel for use as a scaffold to allow the controlled release of an antimicrobial agent for regenerative endodontics.
Materials and methods:
Human extracted teeth were treated via chemical demineralization using ethylene diamine tetra-acetic aci...
Aim:
Assess the retention of endocrowns fabricated of different CAD/CAM materials.
Settings and design:
In vitro - comparative study.
Material and methods:
Root canal treated mandibular first molars were prepared in a standardized method. Standardized endocrowns were manufactured using four CAD-CAM blocks: resin infiltrated ceramic (Vita Enami...
Objectives
To study the effect of artificial aging on color stability, translucency, and surface roughness of stained all‐ceramic restorations.
Materials and methods
Disc‐shaped specimens were fabricated from six different all‐ceramic materials: two glass ceramics (Vita Mark II and Empress CAD), two lithium disilicate based ceramics (e.max and Sup...
Objectives
To evaluate the effect of laser fused and air abraded fluorapatite particles on flexural strength σf and fracture toughness (KIC) of Yttria tetragonal zirconia polycrystal (Y-TZP).
Methods
160 polished Y-TZP bars received one of the following surface treatments: airborne particle abrasion (APA) with fluorapatite glass-ceramics (FGC), AP...
BACKGROUND: Over the past ten years, an alternative for maxillofacial reconstruction was offered through regenerative medicine. It provided
a new scope for improving the reconstruction of the oral and maxillofacial structures whether they are hard tissues which include the teeth and
bone or the soft tissues like the oral mucosa, skin, nerves and...
Background:
Over the past ten years, regenerative medicine has focused on the regeneration and the reconstruction of damaged, diseased, or lost tissues and organs. Skin, being the largest organ in the human body, had attained a good attraction in this field. Delayed wound healing is one of the most challenging clinical medicine complications. This...
Purpose:
This in vitro study aimed to evaluate the influence of fatigue loading on fracture resistance of endodontically treated molars restored with endocrowns using different machinable blocks.
Methods:
Endodontically treated mandibular first molars were prepared using a standardized method. Specimens were divided into 4 groups (n = 10).Anatom...
Objective To evaluate a naturally derived acellular dermal scaffold for soft tissue reconstruction using high-intensity focused ultrasound energy (HIFU).
Materials and Methods Acellular dermal scaffolds (ADSs) were prepared by purification of bovine skin. Half of the scaffolds were subjected to high-intensity focused ultrasound energy (HIFU) to mod...
Background: Dental zirconia has been widely used due to its superior mechanical properties. However, traditional etching techniques and surface treatments are generally ineffective on zirconia surfaces due to its inertness and lack of a silica phase. Hence, various surface treatments are applied to improve bonding to zirconia.
Purpose: improve color match of full anatomical high translucency zirconia restorations using framework modifications.
Materials and methods: Full anatomical high translucency zirconia frameworks (Cercon HT)
received three modifications in framework design to allow room for layering conventional porcelain material: buccal window, extended buccal wi...
Objectives:
To evaluate the polymerization efficiency of a matrix-modified bulk-fill composite, and compare it to a conventional composite which has a similar filler system. The degree of conversion (DC%) and monomer elution were measured over different storage periods. Additionally, fillers' content was examined.
Materials and methods:
Cylindri...
Purpose:
The aim of this study is to evaluate the effect of fusion sputtering surface treatment on the microshear bond strength of zirconia and self-adhesive MDP-containing resin cement.
Materials:
Thirty-six zirconia discs received one of the following treatments: fusion sputtering, airborne particle abrasion with 50-μm aluminum oxide particles...
Objectives: To study influence of different designs of zirconia substructures on color and fracture resistance in bilayered zirconia CAD CAM restorations. Materials and Methods: Fifty identical PMMA dies were 3D printed using stereolithography, to mimic a prepared maxillary first molar with chamfer finish line of 1 mm, axial reduction of 1.5 mm and...
Background:
Zirconia is characterized by a hard, dense, and chemically inert surface which requires additional surface treatments in order to enhance osseointegration. The proposed hypothesis of the study was that combination of a nano-porous surface infiltrated with a bioactive material may enhance osseointegration of zirconia implants.
Methods:...
Purpose
To evaluate marginal bone loss (MBL) of dental implants inserted in active lichen planus patients.
Materials and Methods
The study included 59 subjects divided into 3 groups depending on their lichen planus diagnosis and administration of a low dose of corticosteroids: 17 healthy individuals, 20 controlled lichen planus patients controlled...
Statement of problem:
Reconstruction of alveolar bony defects is difficult using grafting materials in a powder form. A biodegradable scaffold material might simplify the procedure.
Purpose:
The purpose of this in vivo study was to evaluate osteogenesis ability of a biodegradable CAD-CAM-fabricated polylactic acid (PLA) scaffold enriched with ca...
Purpose:
To evaluate the influence of different aging techniques on zirconia-composite microtensile bond strength using different surface treatments over a 5-year follow-up period.
Materials and methods:
Zirconia disks received three surface treatments: airborne-particle abrasion with 50-μm aluminum oxide particles, selective infiltration etchin...
Background
The aim of this study was to evaluate osteogenesis ability of CAD/CAM porous zirconia scaffolds enriched with hydroxy apatite used to augment large boney defects in a dog model.
Methods
Surgical defects were made bilaterally on the lower jaw of 12 Beagle dogs. Cone beam CT images were used to create three dimensional images of the heale...
Statement of problem:
Radiotherapy results in diminished bone remodeling capacity and an elevated risk of osteoradionecrosis, which can negatively influence the survival rate of dental implants. Patients receiving radiotherapy are advised not to receive dental implants during or soon after completing their radiotherapy.
Purpose:
The purpose of t...
Background
The aim of this study was to compare the effect of three recycling methods: conventional aluminum oxide sandblasting combined with silane, tribochemical silica combined with silane and heat application combined with silane, or the shear bond strength of rebonded ceramic brackets compared with newly bonded brackets.
Methods
Sixty mechani...
Purpose:
To evaluate the effect of a novel surface treatment intended to improve bond strength to high-translucency zirconia.
Materials and methods:
Fully sintered high-translucency zirconia disks (Incoris TZI) were divided into four groups according to the surface treatment received: modified fusion sputtering technique, selective infiltration...
Obtaining ideal prosthetic framework design is at times hindered by anatomical limitations in the posterior region that might increase the risk for zirconia restoration fracture. Modification such as increasing the bulk thickness especially in the connector region could result in strengthening the zirconia framework. Three-unit zirconia fixed parti...
Purpose:
To investigate the influence of surface damage on the fatigue behavior of zirconia under two different loading conditions.
Materials and methods:
One hundred twenty zirconia bar-shaped received either airborne particle abrasion using 50μm or 120μm alumina particles while polished specimens served as control. The specimens were subjected...
PURPOSE: To evaluate the influence of low energy surface activation technique on the biaxial flexure strength of zirconia frameworks.
Purpose:
To propose a treatment protocol for management of implant candidates suffering from active lichen planus.
Materials and methods:
Twenty-three patients who were diagnosed with active lichen planus were referred to a dental practice seeking dental implants. Patients received dental implants using open flap technique and sequential osteoto...
Purpose:
to evaluate influence of cyclic fatigue on two resin infiltrated ceramics and three all-ceramic crowns manufactured using CAD/CAM technology.
Materials and methods:
CAD/CAM anatomically shaped crowns were manufactured using two resin infiltrated ceramics (Lava Ultimate and Vita Enamic), two reinforced glass ceramic milling blocks ((IPS)...
Masking Potential of Ceramic Veneers in Thin Sections: Effect of Ceramic Type, Ceramic Thickness, Background Color and Framework Addition
Purpose of the study: Evaluate the influence of ceramic type, tooth color, and presence of framework on the masking potential of ceramic veneers. Materials and methods: Two types of CAD/CAM milling blocks were us...
Interim restorations represent an essential treatment step; however, the optimal resin material for long-term interim restorations requires investigation.
The purpose of this in vitro study was to compare the color stability, water sorption, wear resistance, surface hardness, fracture resistance, and microleakage of computer-aided design/computer-a...
To investigate the effect of different zirconia coping design on fracture resistance and color of porcelain fused to zirconia restorations
p> Purpose: To investigate the relationship between post and core build-up materials on the fracture resistance of endodontically treated teeth restored with different onlay restorations. Methods: 60 mandibular molars were endodontically treated and divided into three experimental groups that received one of the following onlay restorations: gold o...
Purpose:
To evaluate the influence of the internal structure of lithium disilicate glass ceramics (LDC) on the microtensile bond strength to a resin adhesive using two surface treatments.
Materials and methods:
Milling blocks of three types of LDC were sectioned (4 mm thick) using a precision cutting machine: IPS Empress 2 (conventional LDC), IP...
Purpose. The aim of this study was to evaluate three novel surface treatments intended to improve osseointegration of zirconia implants: selective infiltration etching treatment (SIE), fusion sputtering (FS), and low pressure particle abrasion (LPPA). The effects of surface treatments on roughness, topography, hardness, and porosity of implants wer...
Objective:
To investigate the influence of translucency of CAD/CAM ceramic milling blocks on the final color of porcelain veneer cemented using resin cement with two different opacities.
Materials and methods:
A standardized incisal lap preparation was made on a maxillary right central incisor that was duplicated using composite resin material (...
PurposeDelayed placement of implant abutments has been associated with peri-implant marginal bone loss; however, long-term results obtained by modifying surgical and prosthetic techniques after implant placement are still lacking. This study aimed to evaluate the marginal bone loss around titanium implants placed in fresh extraction sockets using t...
The aim of this study was to evaluate color stability, water sorp7on, wear resistance, surface hardness, fracture resistance, and microleakage of CAD/CAM and manually fabricated provisional restora7ons. Purpose Epoxy replicas were made for a maxillary first premolar tooth prepared to receive all-ceramic crown. Provisional crowns were prepared using...
Purpose: The aim of present investigation was to evaluate marginal bone level after 5-year follow-up of implants placed in healed ridges and fresh extraction sockets in maxilla with immediate loading protocol.
Materials and Methods: Thirty-six patients in need of a single-tooth replacement in the anterior maxilla received 42 Astra Tech implants (As...
Objective:
Delamination of porcelain from intact zirconia framework was recently reported as the most common failure mode of these restorations. The aim of this study was to investigate the influence of different laboratory surface treatments on crystals structure and fracture strength of zirconia veneered restorations.
Methods:
Zirconia discs r...
Objective: This in vitro study evaluated the effect of different surface treatments and cement selection on micro-shear bond strength (μSBS) of zirconium-oxide ceramic.
Method: 12-Zirconia discs (LAVA, 3M-ESPE, Seefeld, Germany) were treated as follows; (1) no treatment (control), (2) Tribochemical silica coating using 30µm Al2O3 particles modifi...
Purpose:
The dense nonretentive surface of zirconia implants was modified into a nanoporous surface using selective infiltration etching surface treatment. The aim of this study was to investigate the influence of such a nanoporous modified zirconia surface on the attachment of human osteoblasts.
Materials and methods:
Human osteoblasts were cul...
Objective:
To assess step by step the associated cumulative damage introduced in zirconia veneered restorations after long term cyclic loading using a new multi-level strain accommodating loading protocol.
Methods:
40 zirconia veneered crowns received thermal and cyclic loading (3.5 million cycles at maximum load of 25 kg representing 70% of the...
The aim of this study was to evaluate osseointegration of fusion-sputtered zirconia implants in comparison with sandblasted, acid-etched titanium implants in a biomechanical and histomorphometric study.
Sixty zirconia implants were manufactured using CAD/CAM. Half received fusion sputtering surface treatment through spraying the green body implants...
Purpose. The aim of this study was to investigate the influence of chemical and physical properties of two graft materials on the rate of resorption. Materials and Methods. Direct sinus graft procedure was performed on 22 patients intended for implant placement. Two types of graft materials were used (Bio-Oss and Cerabone) and after 8 months healin...
To evaluate the influence of fusion sputtering on zirconia-resin microtensile bond strength after 6 months of water storage.
Zirconia disks received one of the following surface treatments: particle abrasion with 50-µm aluminum oxide particles or fusion sputtering, while as-sintered specimens served as a control. The prepared zirconia disks (Lava Z...
The aim of this study was to evaluate the effect of finish line design on the fatigue, fracture resistance, and failure type of veneered zirconia restorations.
A CAD/CAM system (Cercon) was used to prepare zirconia frameworks (0.5 mm thick) for a maxillary central incisor. Three finish line designs were evaluated: a complete narrow chamfer, a narro...
Partially yttria stabilized zirconium oxide was introduced as core material for core-veneered full ceramic dental restorations, because of its biological inertness, high mechanical strength, and toughness. In order to improve the esthetical possibilities pigments in the core are introduced, that might influence the stabilization by yttrium.
Double...
Color-matching of the cervical area between natural teeth and different crown prostheses is a common clinical problem.
The purpose of this study was to compare the color of the cervical region of five commercially available crown systems to an extracted natural tooth and to each other.
The color of the cervical region of an extracted maxillar...
Abstract Objective: The aim of this study was to evaluate osseous healing of nano-porous selective infiltration etched zirconia implants in comparison to as-sintered zirconia and titanium implants.Materials and Methods: 20 adult New Zealand white male rabbits received selective infiltration etched surface treated zirconia implants and as-sintered z...
To evaluate the influence of dynamic fatigue on fracture load and failure mode of different types of adhesive zirconia restorations.
Eighty adhesive cantilever fixed dental prostheses (CFDP) were fabricated and assigned to four equal groups (n = 20) using the following materials and techniques. Group 1: machine copy-milling zirconia (Cercon), group...
Selective infiltration etching is a newly developed surface treatment used to modify the surface of zirconiabased materials, rendering it ready for bonding with resin cements. The aim of this study was to evaluate zirconia/resin bond strength and durability using the new technique.
Zirconia disks received one of the following surface treatments: se...
Zirconia is a promising metal-free framework material that can be used to construct all-ceramic resin-bonded restorations in modern minimally invasive dentistry. The lack of a durable bond to zirconia is the major limitation against its widespread use. A technique to promote adhesion to the zirconia surface has thus been actively sought in dental m...
To determine the color space and the coverage error of two manual shade guide systems in four age groups of a selected population.
A total of 174 patients were divided into four age groups and the shade of their natural teeth was measured (2067 teeth) with a spectrophotometer (Vita Easyshade). Color parameters in terms of L*, a*, b* values, chroma,...
This study investigated the effect of different ferrule heights on endodontically treated premolars.
Fifty sound mandibular first premolars were endodontically treated and then restored with 7-mm fiber post (FRC Postec Plus #1 Ivoclar-Vivadent) luted with self-polymerized resin cement (Multilink, Ivoclar Vivadent) while the coronal section was rest...
To evaluate the effect of enzymatic activity and alkaline medium on flexural strength and rotary fatigue resistance of direct and indirect resin composite restorative materials.
Three direct resin composite materials Filtek Z100, Filtek Z250 and Filtek Silorane (3M ESPE), and two indirect resin composite materials; Sinfony (3M ESPE) and an experime...
Objective: This study investigated the effect of different ferrule heights on endodontically treated premolars. Materials and Methods: Fifty sound mandibular first premolars were endodontically treated and then restored with 7-mm fiber post (FRC Postec Plus #1 Ivoclar-Vivadent) luted with self-polymerized resin cement (Multilink, Ivoclar Vivadent)...
To investigate the influence of chemical and enzymatic degradation on the stability of zirconia resin bond strength using micro-shear bond strength test.
Zirconia discs were airborne particle abraded (SB) or selective infiltration etched (SIE) while no surface treatment served as control. Resin composite (Filtek Z250) microdiscs were bonded to zirc...
The aim of this clinical study was to investigate the influence of salivary exposure on microtensile bond strength of one self-etching adhesive resin.
Thirty carious premolars were divided into two groups: a rubber-dam was either inserted before or after cavity preparation and the cavities were restored using direct composite resin. After extractio...
To compare the bond strength values and the ranking order of three phosphate monomer containing resin cements using microtensile (microTBS) and microshear (microSBS) bond strength tests.
Zirconia discs (Procera Zirconia) were bonded to resin composite discs (Filtek Z250) using three different cements (Panavia F 2.0, RelyX UniCem, and Multilink). Tw...
Clinical and laboratory processing techniques induce damage to the surface of zirconia frameworks, which significantly lessens their strength.
The purpose of this study was to investigate the influence of 3 surface restoration methods on the flexural strength of zirconia bars.
Bar-shaped specimens were polished and received 1 of 2 surface treatment...
Purpose: To compare the bond strength values and the ranking order of three phosphate monomer containing resin cements using microtensile (TBS) and microshear (SBS) bond strength tests. Materials and methods: Zirconia discs (Procera Zirconia) were bonded to resin composite discs (Filtek Z250) using three different cements (Panavia F 2.0, RelyX UniC...
Selective infiltration etching (SIE) is a newly developed surface treatment used to modify the surface of zirconia-based materials, rendering them ready for bonding to resin cements. The aim of this study was to evaluate the zirconia/resin bond strength and durability using the proposed technique.
Fifty-four zirconia discs were fabricated and divid...