Dentistry Commons^™

A Comparison Between Three Conservative Treatment Modalities For Anterior Disc Displacement Of The Temporomandibular Joint, Mirna A. Anis, Mohamed Shady, Manar Mansour, Ashraf A. Gebreel

Mansoura Journal of Dentistry

Objective: The purpose of this study was to compare the effects of three types of conservative treatment modalities (maxillary anterior repositioning splint, low-level laser therapy and infra-red led on the temporomandibular joint and masticatory muscles) for temporomandibular disorder. Materials and methods: A total of 30 patients diagnosed with anterior disk displacement with Reduction, underwent examination using magnetic resonance imaging. The participants were randomly assigned according to treatment modalities into three groups (n=10): maxillary anterior repositioning splint, low-level laser therapy and infra-red led. Clinical evaluation was performed at the baseline and after a six-month follow-up period utilizing the Helkimo Clinical Dysfunction …

Conventional Vs Compressive Implants For Supporting Immediate Loading Bar-Retained Mandibular Overdenture: A Study Of Peri-Implant Tissue Health And Implant Stability, Mohammed H. Karkash, Khaled M. Zahran, Islam H. Kandil, Ahmad A. Habib

Mansoura Journal of Dentistry

Objective: This study was aimed to compare two implant design concepts used to assist immediately loaded mandibular complete overdenture as regards to the implant stability and peri-implant soft tissue health.

Materials and Methods: Forty-four healthy fully edentate patients were chosen. Patients received conventional complete dentures and randomly divided into; Group I: with four conventional implants. Group II: with four compressive implants. For all patients, implants installed in the inter-foramina areas and were immediately loaded with mandibular complete overdenture containing metal framework housing three clips and retained by implant screwed titanium bar. Implant stability was measured by Periotest^® and the …

The Impact Of Birth Characteristics And Feeding Habits On The Eruption Of Primary Teeth: A Cross-Sectional Study, Mai Mounir Okda, Salwa Adel Hegazy, Rasha Ibrahim Ramadan

Mansoura Journal of Dentistry

Objective To evaluate the effect of birth characteristics e.g. (birth weight) and feeding habits e.g. (feeding type) on the eruption of primary teeth of new-born infants. Subjects and Methods A cross-sectional study was designed to collect data for this study by using an interviewer-administered closed-ended questionnaire on 500 mothers of healthy infants who were in age group within the first week of birth to 24 months. Oral examination of those infants was done to ascertain the condition of eruption of primary teeth in addition to teething signs and symptoms. Result The mean time of the eruption of first deciduous tooth …

Tensile Bond Strength Of Machinable Ceramics Bonded To Dentin Using Pre-Heated Resin Composite, Flowable Composite And Resin Cement: A Laboratory Trial, Reham K. Elnagar, Radwa I. Eltoukhy, Salah H. Mahmoud

Mansoura Journal of Dentistry

Objective: To evaluate tensile bond strength of machinable ceramics bonded to dentin using pre-heated and flowable resin composites compared to self-adhesive resin cement. Materials and methods: Thirty mid-coronal dentin surfaces were assigned into 3 equal groups (n=10) according to luting agent: pre-heated resin composite, flowable composite and self-adhesive resin cement. Zirconia overlays were fabricated and cemented to the dentin surfaces. After storing in water for 24 hours, each tooth was subjected to the tensile test. A one-way ANOVA test was used to tabulate and statistically analyze the retrieved data (P

Synergistic Effects Of Antimicrobial Components Of The Human-Derived Composite Amnion-Chorion Membrane On Bacterial Growth, Alexandra Su Brummerhop, Chun-Teh Lee, Robin Weltman, Gena D Tribble, Ransome Van Der Hoeven, Yulun Chiu, Jianming Hong, Bing-Yan Wang

Faculty, Staff and Student Publications

Introduction: The human-derived amnion-chorion membrane (ACM) has endogenous antimicrobial properties, which are important for preventing the colonization and survival of oral bacteria on exposed membranes. This project aimed to decipher the underlying mechanism by identifying the components of ACM that confer antibacterial properties. In addition, the antimicrobial efficacy of these identified components on oral bacteria was assessed.

Methods: Four antimicrobial proteins, histone H2A/H2B, cathelicidin LL-37, lactoferrin, and lysozyme, were identified via mass spectrometry in ACM. These proteins were then assessed for their efficacy in killing Streptococcus gordonii Challis. Log-phased bacterial cells were cultured with the commercially available proteins that were …

Effects Of Antiresorptive Medications On Tooth Root Formation And Tooth Eruption In Paediatric Patients, Yuki Arai, Jeryl D English, Noriaki Ono, Wanida Ono

Faculty, Staff and Student Publications

Tooth eruption is a pivotal milestone for children's growth and development. This process involves with the formation of the tooth root, the periodontal ligament (PDL) and the alveolar bone, as the tooth crown penetrates the bone and gingiva to enter the oral cavity. This review aims to outline current knowledge of the adverse dental effects of antiresorptive medications. Recently, paediatric indications for antiresorptive medications, such as bisphosphonates (BPs), have emerged, and these agents are increasingly used in children and adolescents to cure pathological bone resorption associated with bone diseases and cancers. Since tooth eruption is accompanied by osteoclastic bone resorption, …

Multi-Omics Analysis In Developmental Bone Biology, Yuki Matsushita, Azumi Noguchi, Wanida Ono, Noriaki Ono

Faculty, Staff and Student Publications

Single-cell omics and multi-omics have revolutionized our understanding of molecular and cellular biological processes at a single-cell level. In bone biology, the combination of single-cell RNA-sequencing analyses and in vivo lineage-tracing approaches has successfully identified multi-cellular diversity and dynamics of skeletal cells. This established a new concept that bone growth and regeneration are regulated by concerted actions of multiple types of skeletal stem cells, which reside in spatiotemporally distinct niches. One important subtype is endosteal stem cells that are particularly abundant in young bone marrow. The discovery of this new skeletal stem cell type has been facilitated by single-cell multi-omics, …

Cost-Effectiveness Of [99mtc]Tilmanocept Relative To [99mtc]Sulfur Colloid For Sentinel Lymph Node Biopsy In Early Stage Oral Cavity Cancer, Karen Y Choi, Qiang Hao, Kathryn Carlisle, Christopher S Hollenbeak, Stephen Y Lai

Faculty, Staff and Student Publications

BACKGROUND: Several studies have demonstrated varying rates of efficacy, reliability, and sensitivity of sentinel lymph node biopsy (SLNB) in identifying occult nodal disease for early stage oral cavity squamous cell carcinoma (OCSCC) depending on the radionuclide agent utilized. No head-to-head comparison of cost or clinical outcomes of SLNB when utilizing [99mTc]tilmanocept versus [99mTc]sulfur colloid has been performed. The goal of this study was to develop a decision model to compare the cost-effectiveness of [99mTc]tilmanocept versus [99mTc]sulfur colloid in early stage OCSCC.

PATIENTS AND METHODS: A decision model of disease and treatment as a function of SLNB was created. Patients with …

Natural Remedies To Combat Aberrant Hallmark Signatures Including Altered Glycosylation In Oral Carcinoma, Kruti A. Mehta, Jayendra B. Patel, Prabhudas S. Patel

Research Symposium

Background: Tobacco associated oral cancers remain a major concern in India with higher incidence and mortality making it an Indian-centric burning issue. To combat this dreadful disease, we investigated effects of certain natural compounds on the hallmark signatures including glycosylation transcripts levels in oral carcinoma.

Methods: The tongue carcinoma cells- SAS cells were treated with tobacco compounds, natural compounds and Cisplatin. RNA was isolated from the cells and converted to cDNA. RT-qPCR was performed to evaluate expression levels of various genes.

Results: The treatment of tobacco compounds resulted in similar pattern of altered makers (ST3GAL1, NEU3, FUT5, FUT6, MMP2, BCL2) …

Spatially-Aware Clustering Improves Ajcc-8 Risk Stratification Performance In Oropharyngeal Carcinomas, Guadalupe Canahuate, Andrew Wentzel, Abdallah S R Mohamed, Lisanne V Van Dijk, David M Vock, Baher Elgohari, Hesham Elhalawani, Clifton D Fuller, G Elisabeta Marai

Faculty, Staff and Student Publications

OBJECTIVE: Evaluate the effectiveness of machine learning tools that incorporate spatial information such as disease location and lymph node metastatic patterns-of-spread, for prediction of survival and toxicity in HPV+ oropharyngeal cancer (OPC).

MATERIALS & METHODS: 675 HPV+ OPC patients that were treated at MD Anderson Cancer Center between 2005 and 2013 with curative intent IMRT were retrospectively collected under IRB approval. Risk stratifications incorporating patient radiometric data and lymph node metastasis patterns via an anatomically-adjacent representation with hierarchical clustering were identified. These clusterings were combined into a 3-level patient stratification and included along with other known clinical features in a …

Epigenome-Wide Association Study Using Peripheral Blood Leukocytes Identifies Genomic Regions Associated With Periodontal Disease And Edentulism In The Atherosclerosis Risk In Communities Study, Naisi Zhao, Flavia Teles, Jiayun Lu, Devin C Koestler, James Beck, Eric Boerwinkle, Jan Bressler, Karl T Kelsey, Elizabeth A Platz, Dominique S Michaud

Faculty, Staff and Student Publications

AIM: To investigate individual susceptibility to periodontitis by conducting an epigenome-wide association study using peripheral blood.

MATERIALS AND METHODS: We included 1077 African American and 457 European American participants of the Atherosclerosis Risk in Communities (ARIC) study who had completed a dental examination or reported being edentulous at Visit 4 and had available data on DNA methylation from Visit 2 or 3. DNA methylation levels were compared by periodontal disease severity and edentulism through discovery analyses and subsequent testing of individual CpGs.

RESULTS: Our discovery analysis replicated findings from a previous study reporting a region in gene ZFP57 (6p22.1) that …

Effects Of Surface Treatment Method Forming New Nano/Micro Hierarchical Structures On Attachment And Proliferation Of Osteoblast-Like Cells, Jae-Seung Im, Hyunsuk Choi, Hyun-Wook An, Tae-Yub Kwon, Min-Ho Hong

Faculty, Staff and Student Publications

Titanium (Ti) and Ti-based alloys are commonly used in dental implants, and surface modifications of dental implants are important for achieving osseointegration (i.e., direct connection between the implant surface and bone). This study investigated the effect of an eco-friendly etching solution-a hydrogen peroxide-sodium bicarbonate mixture-on the surface properties and contact angles of osteoblast adhesion and proliferation on Ti surfaces. Disk-shaped Ti specimens were prepared using different surface treatments (machining, sandblasting, and sandblasting/acid-etching), and they were immersed in the etching solution and ultrasonically cleaned. Surface characterization was performed using scanning electron microscopy, digital microscopy, contact angle analysis, and X-ray photoelectron spectroscopy. …

Evaluation Of The Clinical And Radiographic Effectiveness Of Treating Peri-Implant Bone Defects With A New Biphasic Calcium Phosphate Bone Graft: A Prospective, Multicenter Randomized Controlled Trial, Jae-Hong Lee, Hyun-Wook An, Jae-Seung Im, Woo-Joo Kim, Dong-Won Lee, Jeong-Ho Yun

Faculty, Staff and Student Publications

PURPOSE: Biphasic calcium phosphate (BCP), a widely used biomaterial for bone regeneration, contains synthetic hydroxyapatite (HA) and β-tricalcium phosphate (β-TCP), the ratio of which can be adjusted to modulate the rate of degradation. The aim of this study was to evaluate the clinical and radiographic benefits of reconstructing peri-implant bone defects with a newly developed BCP consisting of 40% β-TCP and 60% HA compared to demineralized bovine bone mineral (DBBM).

METHODS: This prospective, multicenter, parallel, single-blind randomized controlled trial was conducted at the periodontology departments of 3 different dental hospitals. Changes in clinical (defect width and height) and radiographic (augmented …

Impacts Of A Duf2207 Family Protein On Streptococcus Mutans Stress Tolerance Responses And Biofilm Formation, Xiaochang Huang, Camile G. Laird, Paul P. Riley, Zezhang Tom Wen

School of Dentistry Faculty Publications

Locus SMU.243 in Streptococcus mutans was annotated as a member of the DUF2207 family proteins highly conserved in all bacteria but with unknown function. To investigate its role in S. mutans physiology, a SMU.243-deficient mutant was constructed using allelic exchange mutagenesis, and the impacts of SMU.243 deletion on bacterial growth, stress tolerance response, and biofilm formation were analyzed. Compared to the wild-type UA159, S. mutans lacking SMU.243 displayed a reduced growth rate and a reduced overnight culture density (p < 0.01) when grown at low pH and in the presence of methyl viologen. Relative to the parent strain, the deficient mutant also had a reduced survival rate following incubation in a buffer of pH 2.8 (p < 0.01) and in a buffer containing hydrogen peroxide at 58 mM after 60 min (p < 0.001) and had a reduced capacity in biofilm formation especially in the presence of sucrose (p < 0.01). To study any ensuing functional/phenotypical links between SMU.243 and uppP, which is located immediately downstream of SMU.243 and encodes an undecaprenyl pyrophosphate phosphatase involved in recycling of carrier lipid undecaprenyl phosphate, a uppP deficient mutant was generated using allelic exchange mutagenesis. Unlike the SMU.243 mutant, deletion of uppP affected cell envelope biogenesis and caused major increases in susceptibility to bacitracin. In addition, two variant morphological mutants, one forming rough colonies and the other forming mucoid, smooth colonies, also emerged following the deletion of uppP. The results suggest that the SMU.243-encoded protein of the DUF2207 family in S. mutans plays an important role in stress tolerance response and biofilm formation, but unlike the downstream uppP, does not seem to be involved in cell envelope biogenesis, although the exact roles in S. mutans’ physiology awaits further investigation.

Dental Pulp Stem Cells And Current In Vivo Approaches To Study Dental Pulp Stem Cells In Pulp Injury And Regeneration, Dongwook Yang, Jea Giezl Niedo Solidum, Dongsu Park

Faculty, Staff and Students Publications

Dental pulp stem cells (DPSCs) have garnered significant interest in dental research for their unique characteristics and potential in tooth development and regeneration. While there were many studies to define their stem cell-like characteristics and osteogenic differentiation functions that are considered ideal candidates for regenerating damaged dental pulp tissue, how endogenous DPSCs respond to dental pulp injury and supply new dentin-forming cells has not been extensively investigated in vivo. Here, we review the recent progress in identity, function, and regulation of endogenous DPSCs and their clinical potential for pulp injury and regeneration. In addition, we discuss current advances in new …

Differentially Expressed Genes In Dental Pulp Tissues Of Individuals With Symptomatic Irreversible Pulpitis With And Without History Of Covid-19, Han Na Cho, Leticia Chaves De Souza, Cleverick Johnson, John R Klein, Timothy C Kirkpatrick, Renato Silva, Ariadne Letra

Faculty, Staff and Student Publications

Introduction: Increased levels of proinflammatory markers have been reported in tissues of individuals with Coronavirus Disease 2019 (COVID-19). We hypothesize that inflamed dental pulp tissues of individuals with previous history of COVID-19 may present a differential inflammatory gene expression profile in comparison with individuals who never had COVID-19.

Materials and methods: Dental pulp tissues were collected from 27 individuals referred for endodontic treatment due to symptomatic irreversible pulpitis. Of these, 16 individuals had a history of COVID-19 (6 months to 1 year post infection) and 11 individuals had no previous history of COVID-19 (controls). Total RNA from pulp tissue samples …

Comparison Of Different Reconstruction Flap For Maxillofacial Region: An Original Research, Pallavi Khan Chakraborty, Smit Patel, Misbah Farheen Mulla, Manisha Mangesh Kulkarni, Rummaan Ahmed Sheikh, Anuj Kishor Shukla

Faculty, Staff and Student Publications

INTRODUCTION: Large chunks of the tissue are sacrificed during the surgical procedures for the treatment if oral cancers. Our goal was to assess the viability of "

MATERIAL AND METHODS: Sixty subjects were included in this investigation, and they were divided into 3 groups. The follow-up as accompanied for six months. Comparisons were made for the time for the operations, reduction in the width of the mouth opening and the survival rates of the flaps. The data that was collected for the above two parameters and compared for the significance using the

RESULTS: In the subjects with the PM, the …

Assessment Of The Apical Transportation And Quantity Of Root Canal Dentin Removed Using Different New Rotary File Systems: An Original Study, Harmeet Singh, Anuj K Shukla, Apurva A Jadhav, Anshuman Shetty, Chitharanjan Shetty, Smita D Dutta, Mohammed Mustafa

Faculty, Staff and Student Publications

INTRODUCTION: The rotary systems have found a common application in the clinical practice for the endodontic therapies. Hence, we compared three recent endodontic systems for the comparison of the dentine removal and the apical transportation particularly in the curved canals.

METHODS: Oneshape, Pro Taper Next, and Edgefile X3 were the three systems that were compared. Thirty maxillary mesio buccal canals of the human permanent teeth were compared due to its curved nature. The volume of dentin removed and apical transportation (mm) were measured using micro-computed tomographic imaging (mm). Both the coronal section and the entire canal length had their dentin …

Characterization Of The Oral Microbiota Among Middle-Aged Men With And Without Human Papillomavirus Infection, Kristina R Dahlstrom, Andrew G Sikora, Yanhong Liu, Chia-Chi Chang, Peng Wei, Erich M Sturgis, Guojun Li

Faculty, Staff and Student Publications

OBJECTIVES: To characterize the oral microbiota among middle-aged men and identify differences between men with a prevalent oral high-risk (oncogenic) HPV infection and those without.

MATERIALS AND METHODS: This was a case-control study nested within a prospective screening study for HPV-related cancers among middle-aged men. 16S rRNA sequencing was used to characterize the oral microbiota and the cobas HPV Test was used to detect presence of oral high-risk HPV types. We determined the overall composition of the oral microbiota and assessed differences in relative abundance of bacterial taxa as well as alpha and beta diversity among men with a prevalent …

Effect Of Different Implants Number And Distributions Used To Assist Mandibular Complete Overdenture: A Study Of Bite, Eslam Helmi, Elsayed Abdelkhalek, Ahmed Habib

Mansoura Journal of Dentistry

Objective: This within-patient study aimed to evaluate the influence of different numbers and distribution of implants used to assist mandibular complete overdenture on a patient's maximum biting force and masticatory efficiency. Materials and Methods: Six healthy completely edentulous patients were selected for this study. Each patient received a conventional complete denture then four implants were installed in the canine and premolar areas bilaterally. The implants were delayed loaded by mandibular overdenture using locator attachments, patients were classified into Group I: anterior two implants loaded by the overdenture; Group II: posterior two implants loaded by the overdenture; and Group III: four …

Immediate Implant Placement Simultaneously With Ridge Augmentation In The Maxillary Esthetic Region Using Allograft Versus Autogenous Bone Rings, Mithaq A. Nasser, Nesma M. El- Gohary, Mai A. Haggag, Wael M. Ahmed

Mansoura Journal of Dentistry

Objective: To evaluate allogeneic versus autogenous bone rings (harvested from the chin) for ridge augmentation the of maxillary esthetic zone simultaneously with implant placement. Materials and Methods: This randomized clinical trial included 14 patients who were seeking implant rehabilitation of partially edentulous atrophic ridge the in the esthetic zone. The patients were randomly and equally divided into two groups; immediate implants were placed simultaneously with each autogenous bone ring from chin group I (control group) and, with allogenic bone ring group II (study group). The evaluation was done immediately (T0), postoperatively at 1 month (T1), at 3 months (T3), and …

Single Soft Tissue Support Versus Dual Tooth-Tissue Support For Clasp-Less Mesial Implant Retained Mandibular Class I Rpd: Cross-Over Clinical Study, Aisha Z. Mostafa

Mansoura Journal of Dentistry

Objective: To evaluate the single soft tissue support versus dual tooth-tissue support for mesial implant retained RPD. Materials and Methods: This clinical cross-over study included 10 partially edentulous patients with the only remaining mandibular six anterior teeth. Every patient received two mandibular implants at the 1st premolar region. Two mandibular implants' retained partial overdentures were constructed with two different support concepts, two different designs, opposing a maxillary single denture. One of the dentures was done with a design based mainly on soft tissue support but the other denture was done with a dual tooth-tissue support design. The effects of each …

Adaptation Of Different Milled Post Materials With Flared Root Canals, Ahmed Y. Abdo, Walid A. Al-Zordk, Amal A. Sakrana

Mansoura Journal of Dentistry

Objective: To evaluate the internal adaptation of different milled post materials using microcomputed tomography.Materials and Methods: Forty mandibular first premolar teeth were distributed into four equal groups (n=10). Three groups in which different milled post materials were used in widely flared root canals: group CV; Custom made Vita Enamic posts, group CP; Custom made PEKK posts, group CF; Custom made fiber posts and one group in which ready-made fiber posts were used in normal root canal (group RF). All teeth received root canal treatment and were sectioned 1.5 mm above the cemento-enamel junction. The gutta-percha was removed from the root …

Effect Of Titanium Tetrafluoride On Degree Of Conversion And Bond Strength Of An Orthodontic Primer, Omnia M. Khalifa, Manal F. Badawi, Tarek A. Soliman

Mansoura Journal of Dentistry

Objective: To evaluate the degree of conversion (DC), and orthodontic bracket shear bond strength (SBS) after the incorporation of 3 wt.% TiF4 into an orthodontic primer. Materials and Methods: According to the concentration of TiF4 within the orthodontic primer, there were two groups: the control (TF0C) and experimental groups (TF3C) (0&3 wt.% TiF4 respectively). The DC was evaluated for each group using FTIR. Ten orthodontic brackets were bonded using each concentration to the clean and etched enamel buccal surface. The SBS test was performed in an Instron universal testing machine, using a chisel positioned at the junction interface with a …

Potential Effect Of Different Pulp Capping Materials On Human Dental Pulp Stem Cells: A Laboratory Study, Mohamed A. Bedir, Laila Amin, Essam Soussa

Mansoura Journal of Dentistry

Objective: This study aimed to evaluate the regenerative capacity of two different pulp capping materials TheraCal LC and Nano hydroxyapatite on stem cells extracted from the human dental pulp as a treatment modality for pulp capping. Materials and Methods: Human dental pulp stem cells were obtained and characterized. They were prepared in 12-well plates, cultured in standard culture media, and separated into three groups with 12 each. The first group served as the negative control group and contained only human dental pulp stem cells; the second group contained TheraCal LC, which was incubated with human dental pulp stem cells; and …

Evaluation Of Antimicrobial Efficiency Of Herbal Irrigants Of Pulpectomized Primary Teeth, Hanaa M. Shalan

Mansoura Journal of Dentistry

Objective: This study aimed to evaluate the antimicrobial efficiency of 2 herbal extracts versus 2.5% sodium hypochlorite and saline in eliminating Enterococcus faecalis (E. faecalis) bacteria within infected primary root canals. Materials and Methods: Forty roots of extracted lower primary molars were obtained and divided into 4 groups according to the type of irrigant: Group 1 (control) NaOCl 2.5%, Group 2 (12.5% turmeric irrigant), and Group 3 (25% propolis irrigant) and Group 4 (saline). Root canals were contaminated with E. faecalis bacteria. Bacterial counts were performed from samples that were taken from each canal pre-irrigation and post-irrigation. Data was analyzed …

Marginal Fit Of Veneers Made From Different Lithium Disilicate Cad/Cam Materials, Sara R. Khouri, Maged M. Zohdy, Ghada Abd El Fattah

Mansoura Journal of Dentistry

Objective: To assess the degree of marginal adaptation of CAD/CAM milled veneers from three different lithium disilicate materials: Upcera Lithium Disilicate CAD, Rosetta SM Lithium Disilicate CAD, and Ivoclar IPS e.max CAD, with a marginal thickness of 0.3mm. Materials and Methods: Twenty-four laminate veneers were milled from lithium disilicate blocks (IPS e.max, Upcera, and Rosetta SM) with a marginal thickness of 0.3mm using a CAD/CAM milling machine (Sirona Cerec MCXL), each group of materials consists of 8 veneers and were cemented to duplicated epoxy dies then a digital microscope was used to assess the marginal adaptation. Results: For cervical surfaces, …

Ferrule Effect On Fracture Resistance Of Endodontically Treated Teeth Restored With Two Esthetic Post And Core Materials Fabricated With Different Techniques, Mohamed W. Abdullah, Amina M. Hamdy, Ghada Abdelfattah

Mansoura Journal of Dentistry

Objective: Assessment of ferrule effect on fracture resistance of Customized fiber post and Custom-made PEEK post with a core. Materials and Methods: 28 single-rooted mandibular premolars with approximate similarity in shape and size and no cracks or caries were selected for this study. The length of the root was measured from the root apex to the middle point of the cementoenamel junction in the labial surface; it was about (16±1 mm). Teeth were divided into two groups, each group contained 14 teeth, with a ferrule group and without a ferrule group followed by coronal decapitation of all samples. Endodontic treatment …

Screw Retained Implant Supported Zirconia Anterior Fixed Dental Prosthesis With Different Abutment Angulations: Evaluation Of Fracture Resistance And Failure Modes, Mohamed H. Mohamed, Walid A. Al-Zordk, Nesma El-Gohary, Mohamed H. Ghazy

Mansoura Journal of Dentistry

Objective: To evaluate the effect of different implant-abutment angulations on the fracture resistance of anterior three-unit implant-supported zirconia fixed dental prosthesis. Materials and Methods: Five groups (n=10) were fabricated to represent maxillary anterior three-unit zirconia fixed dental prosthesis supported by two implants with different implant-abutment angulations including group 0o-0o, group 0o-17.5o, group 0o-35o, group 17.5o-17.5o and group 35o-35o. Zirconia FDPs were cemented by self-adhesive resin cement. All specimens were subjected to thermocycling (5000 X 5oC/55oC) and mechanical loading (50 N X 120,000 cycles /1.6Hz). Static loading was applied using the universal testing machine at a crosshead speed of 1 mm/min. …

Evaluation Of Cuspal Deflection Of Fiber Reinforcing Composite Application Techniques Using Measuroscope, Mohamed H. Elkholy, Fatma A. Elerian, Hamdi H. Hamama, Hanan A. Hegazi

Mansoura Journal of Dentistry

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, Tokyo Japan) resin composite restorative material bonded with a universal adhesive (G-Premio BOND GC, Tokyo Japan) were used in the current study. A total of 40 sound maxillary human premolars were selected for the cuspal deflection test and received standardized MOD cavity preparations suitable for each test. The sample was divided into four groups; Group A: conventional microhybrid resin composite …