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Full-Text Articles in Dentistry
Effect Of Different Lateral Condylar Guidance Registration Methods And Articulators On Bilateral Balanced Occlusion Of Complete Denture, Omnia Ahmed, Mostafa Abdel-Ghany, Naglaa Elkilany, Hager El-Sadany
Effect Of Different Lateral Condylar Guidance Registration Methods And Articulators On Bilateral Balanced Occlusion Of Complete Denture, Omnia Ahmed, Mostafa Abdel-Ghany, Naglaa Elkilany, Hager El-Sadany
Al-Azhar Journal of Dentistry
Purpose: This study was conducted to accomplish the most balanced occlusion of the complete denture through comparing between lateral condylar guidance angle records of Hanau Equation, Gothic arch tracing and Computed tomography (CBCT) using arcon and non arcon articulators. Materials and methods: Twelve completely edentulous patients were selected for this study, with age ranging from 50-60 years. Selected patients were free from any temporomandibular disorders or dental diseases. Each patient received a complete denture and then duplicated another one for work. With bilateral balanced occlusion concept. The lateral condylar guidance measured using Hanau equation calculated from protrusive interocclusal records, Gothic …
Evaluation Of Different Fabrication Techniques For Reinforcement Of Mandibular Implant-Retained Overdentures, Heba Salama, Nesrin El-Mahrouky, Dina Kholeif
Evaluation Of Different Fabrication Techniques For Reinforcement Of Mandibular Implant-Retained Overdentures, Heba Salama, Nesrin El-Mahrouky, Dina Kholeif
Al-Azhar Journal of Dentistry
Purpose: This study was performed to evaluate the effect of PEEK reinforced mandibular implant overdenture, in comparison with metal reinforced mandibular implant overdenture on bone height. Subjects and methods: Fourteen completely edentulous patients were selected with ages ranging from 50-70 years. All the patients received two implants in the inter-foraminal area of the mandible and maxillary complete dentures, then they were divided into two groups: group (I) seven patients received PEEK reinforced mandibular implant overdentures, group (II) seven patients received metal reinforced mandibular implant overdentures. The overdentures were functionally loaded after three months of implant insertion and retained with the …
Remineralizing Effect Of Diode Laser And Amelogenin Peptide On Early Enamel Carious Lesion, Yasmin Badr, Maha Niazy, Dina El-Kassass
Remineralizing Effect Of Diode Laser And Amelogenin Peptide On Early Enamel Carious Lesion, Yasmin Badr, Maha Niazy, Dina El-Kassass
Al-Azhar Journal of Dentistry
Purpose: This study was done to investigate the efficacy of Diode laser andAmelogenin peptide on the remineralization of early enamel carious lesions. Materialsand methods: Artificial carious lesions were created on the buccal and lingual surfacesof 60 enamel specimens. Specimens were assigned to three groups of 20 specimensper each according to the remineralizing protocol: G1 (Diode laser), G2 (Diodelaser + Amelogenin peptide), G3 (Amelogenin peptide). The groups were furtherrandomly subdivided into two groups (n=10) whether specimens subjected to staticremineralization or pH cycling. Surface micro-hardness was assessed at baseline,demineralization and after treatment. Surface microhardness values were analyzed usingone way ANOVA and Tukey’s …
Influence Of Direct And Indirect Digital Data Capturing Techniques On Marginal Accuracy And Internal Fit Of Cad/Cam Fabricated Peek And Zirconia Crowns, Samira Abdel Salam, Atef Ahmed, Nasser Ali
Influence Of Direct And Indirect Digital Data Capturing Techniques On Marginal Accuracy And Internal Fit Of Cad/Cam Fabricated Peek And Zirconia Crowns, Samira Abdel Salam, Atef Ahmed, Nasser Ali
Al-Azhar Journal of Dentistry
Purpose: The aim of this study was to evaluate the marginal and internal fitness of PEEK and Zirconia crowns fabricated by three different impression techniques. Materials and methods: Thirty standardized acrylic die models were prepared. Dies were divided into two main groups (n= 15): Group 1: CAD/CAM fabricated zirconia crowns. Group 2: CAD/CAM fabricated PEEK crowns. Each group was subdivided into three subgroups (n= 5), according to the impression technique using for data acquisition: Sub-group (A): direct digital scans of the model used intraoral digital scanner. Sub-group (B): indirect digital scans of the silicon impressions using extraoral scanner. Sub-group (C): …
Effect Of Rapid Prototyped Complete Denture On Electromyographic Activity, Alia Nour, Mostafa Abdel-Ghany, Shereen Kabeel
Effect Of Rapid Prototyped Complete Denture On Electromyographic Activity, Alia Nour, Mostafa Abdel-Ghany, Shereen Kabeel
Al-Azhar Journal of Dentistry
Purpose: This study was directed to evaluate the electromyographic activity(EMG) of patients with rapid prototyped (RP) complete denture. Subjects andmethods: A total of ten completely edentulous subjects aged between 45-50 years wereselected following specific inclusion criteria from the outpatient clinic of RemovableProsthodontics Department, Faculty of Dental Medicine for Girls, AL-Azhar University.All Patients had received two complete dentures; one constructed by rapid prototypedtechnology and the other constructed by conventional heat compressed method.Patients were classified into two groups, five patients in each. First Group received theRP complete denture first then the conventional complete denture (CCD) while, secondgroup received the (CCD) first then …
Effect Of Aging Treatments On Properties Of Zirconia With Different Levels Of Translucency, Mayar Abdel El-Salam, Sahar Abdel-Aziz, Zahraa Gabal
Effect Of Aging Treatments On Properties Of Zirconia With Different Levels Of Translucency, Mayar Abdel El-Salam, Sahar Abdel-Aziz, Zahraa Gabal
Al-Azhar Journal of Dentistry
Purpose: The aim of this study was to evaluate the effect of low-temperature degradation(L-TD), and weathering process on translucency, surface roughness, biaxial-flexural strength, and crystalline phase identification of zirconia with different levels of translucency. Materials and methods: A total of ninety-six (N= 96) zirconia discs were fabricated in this study. Samples were divided into three groups (n=32 each) according to type of zirconia: IPS EmaxZirCAD of low, medium translucency and Incoris translucent Zirconia of high translucency. Translucency measurements, surface roughness, biaxial flexural strength determination and phase identification were carried out before and after aging. Each group was then sub-divided into …
Evaluation Of Two Denture Base Material On The Supporting Structures Of Mandibular Tooth Supported Over Denture, Eman Mohammady, Amany Abdel-Fattah, Dina Kholief
Evaluation Of Two Denture Base Material On The Supporting Structures Of Mandibular Tooth Supported Over Denture, Eman Mohammady, Amany Abdel-Fattah, Dina Kholief
Al-Azhar Journal of Dentistry
Purpose: To compare the effect of thermoplastic resin and heat cured acrylic resindenture base materials on pocket depth and bone height around two mandibular caninessupporting mandibular tooth supported over denture. Subject and Methods: Tenpatients having completely edentulous maxillary ridge and bilateral canine in the lowerarch were selected. Root canal treatment and preparation were performed to obtainnon coping abutment with amalgam plugs that covered with over denture. Maxillarycomplete dentures were constructed for all patients. Patients were divided into two equalgroups. Group I: received thermoplastic mandibular over denture. Group II: receivedconventional heat cure acrylic resin mandibular over denture. Clinical and radiographic evaluation …
Effect Of Naturally Derived Dentin Bio-Modifiers On Immediate And Long-Term Bond Strength Of Etch And Rinse Adhesive To Dentin, Mona El Lakany, Maha Niazy, Hamed Mohamed
Effect Of Naturally Derived Dentin Bio-Modifiers On Immediate And Long-Term Bond Strength Of Etch And Rinse Adhesive To Dentin, Mona El Lakany, Maha Niazy, Hamed Mohamed
Al-Azhar Journal of Dentistry
Purpose: To investigate the effect of 10% Proanthocyanidin (PA) rich grape seedextract (GSE) and cardanol oil applied for 60s on immediate and long-term shearbond strength (SBS) of etch and rinse to dentin. Materials and methods: The occlusalsurfaces of forty two samples were ground to expose flat superficial dentin surfaces.The samples were divided into 3 groups; Group A1 (control group) without any pretreatment,Group A2 (10 % GSE), Group A3 (cardanol). Pre-treatments were appliedfor 60s and then washed away for 30s. Each group was further randomly subdividedinto two groups (n=7) according to the storage time (immediate 24 hours) and (longtermsix months period). …
Effect Of Protein Repellent Addition To Self-Healing Experimental Resin Composite On Microcosm Biofilm And Cytotoxicity, Passant Abdel Hameed, Inas Motawea, Hisham Essawy, Mohamed Hosny
Effect Of Protein Repellent Addition To Self-Healing Experimental Resin Composite On Microcosm Biofilm And Cytotoxicity, Passant Abdel Hameed, Inas Motawea, Hisham Essawy, Mohamed Hosny
Al-Azhar Journal of Dentistry
Purpose: To investigate the effect of addition of MPC protein repellent agent to selfhealingexperimental resin composite on the self-healing efficacy, microcosm biofilmand the cytoxicity. Material and Methods: Polyurea formaldehyde microcapsuleswere synthesized by Insitu Polymerization Technique. MPC and the microcapsules areadded to the prepared experimental resin composite with different MPC concentrations.Protein repellence essay was examined by the Micro bicinchoninic Acid method.Biofilm models formed of streptococcus mutans growth was prepared and visualized byconfocal laser electron microscope to investigate the live \ dead assay over the studiedspecimens. The cytotoxicity of the specimens was examined via SRB assay. Fracturetoughness was examined using universal testing …
The Effect Of Zirconia And Titanium As Abutment Materials On Peri-Implant Soft And Hard Tissues In Mandibular Implant Supported Over-Denture, Reham Elshiekh, Shereen Kabeel, Hala Gamal Eldin
The Effect Of Zirconia And Titanium As Abutment Materials On Peri-Implant Soft And Hard Tissues In Mandibular Implant Supported Over-Denture, Reham Elshiekh, Shereen Kabeel, Hala Gamal Eldin
Al-Azhar Journal of Dentistry
Purpose: To evaluate the effect of zirconia and titanium as abutment materials onperi-implant bone height changes and pocket depth in mandibular implant supportedover-denture. Subjects and methods: Ten completely edentulous patients wereselected from the Outpatient Clinic of the Faculty of Dental Medicine for Girls,Al-Azhar University. Two implants were implanted in the inter-foraminal area ofmandibular ridge. Two different abutments were screwed over implants. Right abutmentwas constructed of zirconia and left one was constructed of titanium. Construction ofmaxillary complete denture and mandibular implant supported over-denture for allpatients was performed. Radiographic and clinical evaluation of implants has beenperformed at denture insertion, 6 months, 9 …
Effect Of Different Lateral Condylar Guidance Registration Methods And Articulators On Bilateral Balanced Occlusion Of Complete Denture, Omnia Ahmed, Mostafa Abdel-Ghany, Naglaa Elkilany, Hager El-Sadany
Effect Of Different Lateral Condylar Guidance Registration Methods And Articulators On Bilateral Balanced Occlusion Of Complete Denture, Omnia Ahmed, Mostafa Abdel-Ghany, Naglaa Elkilany, Hager El-Sadany
Al-Azhar Journal of Dentistry
Purpose: This study was conducted to accomplish the most balanced occlusion of the complete denture through comparing between lateral condylar guidance angle records of Hanau Equation, Gothic arch tracing and Computed tomography (CBCT) using arcon and non arcon articulators. Materials and methods: Twelve completely edentulous patients were selected for this study, with age ranging from 50-60 years. Selected patients were free from any temporomandibular disorders or dental diseases. Each patient received a complete denture and then duplicated another one for work. With bilateral balanced occlusion concept. The lateral condylar guidance measured using Hanau equation calculated from protrusive interocclusal records, Gothic …
Effect Of Rapid Prototyped Complete Denture On Electromyographic Activity, Alia Nour, Mostafa Abdel-Ghany, Shereen Kabeel
Effect Of Rapid Prototyped Complete Denture On Electromyographic Activity, Alia Nour, Mostafa Abdel-Ghany, Shereen Kabeel
Al-Azhar Journal of Dentistry
Purpose: This study was directed to evaluate the electromyographic activity(EMG) of patients with rapid prototyped (RP) complete denture. Subjects andmethods: A total of ten completely edentulous subjects aged between 45-50 years wereselected following specific inclusion criteria from the outpatient clinic of RemovableProsthodontics Department, Faculty of Dental Medicine for Girls, AL-Azhar University.All Patients had received two complete dentures; one constructed by rapid prototypedtechnology and the other constructed by conventional heat compressed method.Patients were classified into two groups, five patients in each. First Group received theRP complete denture first then the conventional complete denture (CCD) while, secondgroup received the (CCD) first then …
Effect Of Protein Repellent Addition To Self-Healing Experimental Resin Composite On Microcosm Biofilm And Cytotoxicity, Passant Abdel Hameed, Inas Motawea, Hisham Essawy, Mohamed Hosny
Effect Of Protein Repellent Addition To Self-Healing Experimental Resin Composite On Microcosm Biofilm And Cytotoxicity, Passant Abdel Hameed, Inas Motawea, Hisham Essawy, Mohamed Hosny
Al-Azhar Journal of Dentistry
Purpose: To investigate the effect of addition of MPC protein repellent agent to selfhealingexperimental resin composite on the self-healing efficacy, microcosm biofilmand the cytoxicity. Material and Methods: Polyurea formaldehyde microcapsuleswere synthesized by Insitu Polymerization Technique. MPC and the microcapsules areadded to the prepared experimental resin composite with different MPC concentrations.Protein repellence essay was examined by the Micro bicinchoninic Acid method.Biofilm models formed of streptococcus mutans growth was prepared and visualized byconfocal laser electron microscope to investigate the live \ dead assay over the studiedspecimens. The cytotoxicity of the specimens was examined via SRB assay. Fracturetoughness was examined using universal testing …
Evaluation Of Two Denture Base Material On The Supporting Structures Of Mandibular Tooth Supported Over Denture, Eman Mohammady, Amany Abdel-Fattah, Dina Kholief
Evaluation Of Two Denture Base Material On The Supporting Structures Of Mandibular Tooth Supported Over Denture, Eman Mohammady, Amany Abdel-Fattah, Dina Kholief
Al-Azhar Journal of Dentistry
Purpose: To compare the effect of thermoplastic resin and heat cured acrylic resindenture base materials on pocket depth and bone height around two mandibular caninessupporting mandibular tooth supported over denture. Subject and Methods: Tenpatients having completely edentulous maxillary ridge and bilateral canine in the lowerarch were selected. Root canal treatment and preparation were performed to obtainnon coping abutment with amalgam plugs that covered with over denture. Maxillarycomplete dentures were constructed for all patients. Patients were divided into two equalgroups. Group I: received thermoplastic mandibular over denture. Group II: receivedconventional heat cure acrylic resin mandibular over denture. Clinical and radiographic evaluation …
The Effect Of Zirconia And Titanium As Abutment Materials On Peri-Implant Soft And Hard Tissues In Mandibular Implant Supported Over-Denture, Reham Elshiekh, Shereen Kabeel, Hala Gamal Eldin
The Effect Of Zirconia And Titanium As Abutment Materials On Peri-Implant Soft And Hard Tissues In Mandibular Implant Supported Over-Denture, Reham Elshiekh, Shereen Kabeel, Hala Gamal Eldin
Al-Azhar Journal of Dentistry
Purpose: To evaluate the effect of zirconia and titanium as abutment materials onperi-implant bone height changes and pocket depth in mandibular implant supportedover-denture. Subjects and methods: Ten completely edentulous patients wereselected from the Outpatient Clinic of the Faculty of Dental Medicine for Girls,Al-Azhar University. Two implants were implanted in the inter-foraminal area ofmandibular ridge. Two different abutments were screwed over implants. Right abutmentwas constructed of zirconia and left one was constructed of titanium. Construction ofmaxillary complete denture and mandibular implant supported over-denture for allpatients was performed. Radiographic and clinical evaluation of implants has beenperformed at denture insertion, 6 months, 9 …
Digital Photography Versus Spectrophotometry Assessment Of Color Stability Of Resin Composite, Eman Ezz, Doaa El-Sharkawy, Samaa Zaghloul
Digital Photography Versus Spectrophotometry Assessment Of Color Stability Of Resin Composite, Eman Ezz, Doaa El-Sharkawy, Samaa Zaghloul
Al-Azhar Journal of Dentistry
Purpose: To compare digital photography to spectrophotometry in evaluating the color stability of resin composite. Materials and methods: Thirty- two disc-like specimens of Filtek Z350 resin composite were prepared and color-assessed; before and after 30 days of submersion in coffee solution. For each specimen, color was assessed according to Commission Internationale de I’Eclairage (CIE) color space values using: Two different versions of Canon Digital Single Lens Reflex (DSLR) camera; with standard lenses, flash, and settings: Canon 600d (Group I) and Canon 1100d (Group II), and a digital spectrophotometer (Vita Easyshade advance 4.0; Vita Zahnfabrik, Bad Sackingen, Germany) as a control …
Evaluation Of Different Fabrication Techniques For Reinforcement Of Mandibular Implant-Retained Overdentures, Heba Salama, Nesrin El-Mahrouky, Dina Kholeif
Evaluation Of Different Fabrication Techniques For Reinforcement Of Mandibular Implant-Retained Overdentures, Heba Salama, Nesrin El-Mahrouky, Dina Kholeif
Al-Azhar Journal of Dentistry
Purpose: This study was performed to evaluate the effect of PEEK reinforced mandibular implant overdenture, in comparison with metal reinforced mandibular implant overdenture on bone height. Subjects and methods: Fourteen completely edentulous patients were selected with ages ranging from 50-70 years. All the patients received two implants in the inter-foraminal area of the mandible and maxillary complete dentures, then they were divided into two groups: group (I) seven patients received PEEK reinforced mandibular implant overdentures, group (II) seven patients received metal reinforced mandibular implant overdentures. The overdentures were functionally loaded after three months of implant insertion and retained with the …
Remineralizing Effect Of Diode Laser And Amelogenin Peptide On Early Enamel Carious Lesion, Yasmin Badr, Maha Niazy, Dina El-Kassass
Remineralizing Effect Of Diode Laser And Amelogenin Peptide On Early Enamel Carious Lesion, Yasmin Badr, Maha Niazy, Dina El-Kassass
Al-Azhar Journal of Dentistry
Purpose: This study was done to investigate the efficacy of Diode laser andAmelogenin peptide on the remineralization of early enamel carious lesions. Materialsand methods: Artificial carious lesions were created on the buccal and lingual surfacesof 60 enamel specimens. Specimens were assigned to three groups of 20 specimensper each according to the remineralizing protocol: G1 (Diode laser), G2 (Diodelaser + Amelogenin peptide), G3 (Amelogenin peptide). The groups were furtherrandomly subdivided into two groups (n=10) whether specimens subjected to staticremineralization or pH cycling. Surface micro-hardness was assessed at baseline,demineralization and after treatment. Surface microhardness values were analyzed usingone way ANOVA and Tukey’s …
Influence Of Direct And Indirect Digital Data Capturing Techniques On Marginal Accuracy And Internal Fit Of Cad/Cam Fabricated Peek And Zirconia Crowns, Samira Abdel Salam, Atef Ahmed, Nasser Ali
Influence Of Direct And Indirect Digital Data Capturing Techniques On Marginal Accuracy And Internal Fit Of Cad/Cam Fabricated Peek And Zirconia Crowns, Samira Abdel Salam, Atef Ahmed, Nasser Ali
Al-Azhar Journal of Dentistry
Purpose: The aim of this study was to evaluate the marginal and internal fitness of PEEK and Zirconia crowns fabricated by three different impression techniques. Materials and methods: Thirty standardized acrylic die models were prepared. Dies were divided into two main groups (n= 15): Group 1: CAD/CAM fabricated zirconia crowns. Group 2: CAD/CAM fabricated PEEK crowns. Each group was subdivided into three subgroups (n= 5), according to the impression technique using for data acquisition: Sub-group (A): direct digital scans of the model used intraoral digital scanner. Sub-group (B): indirect digital scans of the silicon impressions using extraoral scanner. Sub-group (C): …
Effect Of Aging Treatments On Properties Of Zirconia With Different Levels Of Translucency, Mayar Abdel El-Salam, Sahar Abdel-Aziz, Zahraa Gabal
Effect Of Aging Treatments On Properties Of Zirconia With Different Levels Of Translucency, Mayar Abdel El-Salam, Sahar Abdel-Aziz, Zahraa Gabal
Al-Azhar Journal of Dentistry
Purpose: The aim of this study was to evaluate the effect of low-temperature degradation(L-TD), and weathering process on translucency, surface roughness, biaxial-flexural strength, and crystalline phase identification of zirconia with different levels of translucency. Materials and methods: A total of ninety-six (N= 96) zirconia discs were fabricated in this study. Samples were divided into three groups (n=32 each) according to type of zirconia: IPS EmaxZirCAD of low, medium translucency and Incoris translucent Zirconia of high translucency. Translucency measurements, surface roughness, biaxial flexural strength determination and phase identification were carried out before and after aging. Each group was then sub-divided into …
Effect Of Naturally Derived Dentin Bio-Modifiers On Immediate And Long-Term Bond Strength Of Etch And Rinse Adhesive To Dentin, Mona El Lakany, Maha Niazy, Hamed Mohamed
Effect Of Naturally Derived Dentin Bio-Modifiers On Immediate And Long-Term Bond Strength Of Etch And Rinse Adhesive To Dentin, Mona El Lakany, Maha Niazy, Hamed Mohamed
Al-Azhar Journal of Dentistry
Purpose: To investigate the effect of 10% Proanthocyanidin (PA) rich grape seedextract (GSE) and cardanol oil applied for 60s on immediate and long-term shearbond strength (SBS) of etch and rinse to dentin. Materials and methods: The occlusalsurfaces of forty two samples were ground to expose flat superficial dentin surfaces.The samples were divided into 3 groups; Group A1 (control group) without any pretreatment,Group A2 (10 % GSE), Group A3 (cardanol). Pre-treatments were appliedfor 60s and then washed away for 30s. Each group was further randomly subdividedinto two groups (n=7) according to the storage time (immediate 24 hours) and (longtermsix months period). …
Effect Of Repeated Heat-Pressing On Marginal And Internal Fit Of Lithium Disilicate Glass Ceramic Crowns After Thermo-Mechanical Fatigue, Esraa R. Albatrawy, Rania A. Amin, Roqaia Alassar
Effect Of Repeated Heat-Pressing On Marginal And Internal Fit Of Lithium Disilicate Glass Ceramic Crowns After Thermo-Mechanical Fatigue, Esraa R. Albatrawy, Rania A. Amin, Roqaia Alassar
Al-Azhar Journal of Dentistry
Purpose: To evaluate the effect of repeated heat-pressing on marginal and internal fit of lithium disilicate glass ceramic crowns. Materials and Methods: A freshly extracted caries free human maxillary 1st premolar was prepared according to standardized preparation for all-ceramic crown restoration. The preparation was duplicated to produce thirty epoxy resin dies. The resin dies were divided into three groups (n=10) according to the number of heat-pressings of IPS e.max Press (Shade A2, LT) used for crowns construction. Group 1: Crowns constructed from freshly pressed ingots, Group 2: Crowns constructed from leftover repressed buttons for 1st time, and Group 3: Crowns …
Effect Of Different Biomimetic Materials On White Spot Lesions In Enamel (A Split-Mouth Clinical Trial), Eptesam A. Elbegawy, Maha A. Niazy, Asmaa Y. Harhash
Effect Of Different Biomimetic Materials On White Spot Lesions In Enamel (A Split-Mouth Clinical Trial), Eptesam A. Elbegawy, Maha A. Niazy, Asmaa Y. Harhash
Al-Azhar Journal of Dentistry
Purpose: To assess the remineralizing effect and clinical effectiveness of different biomimetic materials (Zinc carbonate hydroxyapatite microparticles (Zn CHA), bioactive glass nanoparticles (BAG) and Poly-amido amine (PAMAM)) on white spot lesions in enamel (WSLs). Materials and Methods: A number of 84 teeth (21 patients) were assigned into 3 groups of 28 teeth (7 patients) in accordance to the time of assessment (immediately B1, after one-month B2 and after two months B3). According to the tested material; every patient had a split mouth (four quadrants). Zn CHA was used in the first group A1, BAG was used in the second group …
Effect Of Repeated Heat-Pressing On Color And Translucency Of Lithium Disilicate Glass Ceramic Crowns, Aya Y. Saber, Rania A. Amin, Roqaia M. Alassar
Effect Of Repeated Heat-Pressing On Color And Translucency Of Lithium Disilicate Glass Ceramic Crowns, Aya Y. Saber, Rania A. Amin, Roqaia M. Alassar
Al-Azhar Journal of Dentistry
Purpose: To evaluate the effect of repeated heat-pressing and thermomechanical fatigue on color and translucency of lithium disilicate glass ceramic crowns. Materials and Methods: A freshly extracted human maxillary right 1st premolar was prepared according to standardized preparation for all-ceramic crown restoration. The preparation was duplicated to produce thirty epoxy resin dies. The resin dies were divided into three groups (n=10), according to the number of heat-pressings of IPS e.max Press used for crowns construction. Group 1: Control group using freshly pressed ingots, Group 2: Repressed 1 using leftover repressed buttons for 1st time, and Group 3: Repressed 2 using …
Influence Of Ascorbic Acid On Shear-Bond Strength At Tooth Restoration Interface After Immediate Bleaching Procedures, Labib Elsebaey, Maha Elhousiny, Mohamed Wakwak
Influence Of Ascorbic Acid On Shear-Bond Strength At Tooth Restoration Interface After Immediate Bleaching Procedures, Labib Elsebaey, Maha Elhousiny, Mohamed Wakwak
Al-Azhar Journal of Dentistry
Purpose: This study evaluated the effect of ascorbic acid on shear bond strength at tooth restoration interface after immediate bleaching procedures. Materials and Methods: Sixty freshly extracted human premolars were used. Teeth were divided into two main groups (A& B) according to the application mode of the adhesive system (n=30). Group A: self-etch mode, Group B: Etch-and-rinse mode. Each group was subdivided into three subgroups (1,2,3) according to ascorbic acid application (n=10). Data were collected, tabulated, and statistically evaluated. Results: The immediately bonded specimens after the bleaching procedure showed the statistically lowest mean shear bond strength values. These results were …
Clinical Evaluation Of Conventional Maxillary Heat-Cured Acrylic Single Denture Versus Peek: A Crossover Study Of Retention, Fatma El-Waseef, Heba Abozaed
Clinical Evaluation Of Conventional Maxillary Heat-Cured Acrylic Single Denture Versus Peek: A Crossover Study Of Retention, Fatma El-Waseef, Heba Abozaed
Al-Azhar Journal of Dentistry
Purpose: This clinical study aimed to evaluate the retention quality of conventional heat-cured poly methyl methacrylate (PMMA) compared to Poly Ether-Ether Ketone (PEEK) maxillary single dentures. Materials and Methods: Ten participants were eligible having completely edentulous maxillary arches opposed by class I Kennedy mandibular arches. Every patient received two maxillary single dentures fabricated by two different materials and techniques utilizing a crossover design. Each patient was provided with a single maxillary conventional PMMA denture fabricated by the conventional technique (group I) and a PEEK single maxillary denture fabricated by CAD /CAM technique (group II). The force-meter was implemented to measure …
The Reinforcement Effect Of Nano-Zirconia On The Flexural Strength And Impact Strength Of Microwaved And Heat Cured Acrylic Resin, Amal Eid, Mohamed Souhail, Heba Eltayeb
The Reinforcement Effect Of Nano-Zirconia On The Flexural Strength And Impact Strength Of Microwaved And Heat Cured Acrylic Resin, Amal Eid, Mohamed Souhail, Heba Eltayeb
Al-Azhar Journal of Dentistry
Purpose: This study was conducted to evaluate the effect of adding nano-zirconia with different concentrations on the flexural and impact strength of microwaved and heat cured acrylic resin. Materials and Methods: The silanized nano-ZrO2 particles (nano-zirconia) were added to PMMA powder for both heat polymerized and microwaved acrylic resin. A total of 160 specimens were prepared from both types of acrylic resin (n=80). For both types of acrylic resin, specimens for each strength test were subdivided into 4 subgroups (n=10): a control group (with no fillers) and three reinforced groups with 3 concentrations (3%, 5% and 7%) wt. % of …
Comparative Study Of Microtensile Bond Strength Of Zirconomer, Conventional And Resin Modified Glass Ionomer, Amgad Rezk, Wael Jamil, Fatma Hussein
Comparative Study Of Microtensile Bond Strength Of Zirconomer, Conventional And Resin Modified Glass Ionomer, Amgad Rezk, Wael Jamil, Fatma Hussein
Al-Azhar Journal of Dentistry
Purpose: The aim of this study was to compare the microtensile bond strength of zirconomer to conventional and resin modified glass ionomers bonded to enamel and dentin substrates. Materials and Methods: 30 molars were enrolled in this study, they were divided into three groups according to the type of glass ionomer used (each 10 teeth):A1: conventional, A2: resin modified, and A3: zirconia infused glass ionomer. Each group was subdivided into two subgroups (each 5 teeth) according to the substrate that the material was bonded. B1: enamel substrate, B2: dentin substrate. After preparation of flat enamel and dentin specimens, glass ionomers …
Comparison Of Condylar Inclination Attained By Interocclusal Records, Graphic Tracer And Arcus Digma Ii And Their Effect On Bilateral Balanced Occlusion, Sara M. Medhat, Mostafa M. Abdel Ghany, Shereen M. Kabeel, Ahmed K. Aboelfadl
Comparison Of Condylar Inclination Attained By Interocclusal Records, Graphic Tracer And Arcus Digma Ii And Their Effect On Bilateral Balanced Occlusion, Sara M. Medhat, Mostafa M. Abdel Ghany, Shereen M. Kabeel, Ahmed K. Aboelfadl
Al-Azhar Journal of Dentistry
Purpose: Was to compare between the interocclusal record for protrusive movement, the tracing method and the electronic face bow (Arcus Digma) for recording horizontal condylar guidance and their effects on bilateral balanced occlusion. Material and methods: Ten completely edentulous patients with an average age of 55 years old participated in this study. Each patient received upper and lower complete denture, artificial teeth were arranged according to balanced occlusion concept. The horizontal condylar angle was recorded during patient mandibular protrusion of 6mm using the following techniques; interocclusal record, tracer (quick set analyzer) and electronic face bow (Arcus Digma II). Results: The …
Comparative Color Stability Assessment Of One- Shaded Structurally-Colored And Conventional Multi-Shaded Resin Composites, Eman Ezz, Doaa El-Sharkawy, Samaa Zaghloul
Comparative Color Stability Assessment Of One- Shaded Structurally-Colored And Conventional Multi-Shaded Resin Composites, Eman Ezz, Doaa El-Sharkawy, Samaa Zaghloul
Al-Azhar Journal of Dentistry
ABSTRACT Purpose: To assess the color stability of one- shaded structurally- colored resin composite compared to conventional multi- shaded one. Subjects and methods: Thirty- two disc- like specimens from one- shaded structurally- colored resin composite (Omnichroma, Tokuyama Dental); Group I, or conventional resin composite (Filtek Z350, 3M ESPE); Group II were prepared, with equal allocation ratio (i.e.: n= 16). Samples were left in coffee then by using spectrophotometry, colors for all specimens were assessed in (CIE) Lab values; before (baseline) and 30 days later. Substitution in the (after - before) equation was performed to obtain the color change (ΔE); to …