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Analysis Of Stresses In Mandible And Skull Under Angular Impact, Dr. Shobha E S, Dr. Suresh Nagesh, Dr. H Raghuveer, Mr. Vinay S 2015 Selected Works

Analysis Of Stresses In Mandible And Skull Under Angular Impact, Dr. Shobha E S, Dr. Suresh Nagesh, Dr. H Raghuveer, Mr. Vinay S

Innovative Research Publications IRP India

Finite element analysis has gained a significant attention in the field of biomechanics. The versatility of finite element analysis is the major reason behind its implementation and adoption has made the study of biomechanics much easier and simpler. FEA, as a tool has helped in analyzing the various organs in human body in different loading conditions. Be it Orthopedic,Maxillofacial fractures,Orthodontics, Prosthodontics, hemodynamics, it is finding its applications in all areas of biomechanics. In this paper, one such study has been carried out to understand the behavior of skull and mandible under inclined impacts. Skull is one of the ...


Changes In Composite Toxicity Following Exposure To Pulp Capping Materials, Audra Long 2015 Marquette University

Changes In Composite Toxicity Following Exposure To Pulp Capping Materials, Audra Long

Master's Theses (2009 -)

Introduction: Direct pulp capping involves placing a material over the exposed pulp in order to maintain its vitality. For decades, calcium hydroxide (CH) has served as the gold standard for this purpose, but its toxicity to the pulp may negatively impact treatment outcomes. Mineral Trioxide Aggregate (MTA) has become a popular alternative based partly on its excellent biocompatibility. Pulp-capped teeth are often restored with highly toxic composite materials, but the pulp capping material’s ability to alter these toxic effects has never been investigated. The purpose of this in vitro study is to determine the effects of Dycal, a CH-based ...


Mechanical Properties And Patient Perceptions Of Commonly Used Clear Aligner Systems As-Received And After Clinical Use, Lauren Evan Montoure Teske 2015 Marquette University

Mechanical Properties And Patient Perceptions Of Commonly Used Clear Aligner Systems As-Received And After Clinical Use, Lauren Evan Montoure Teske

Master's Theses (2009 -)

Background/Objectives: This study aimed to investigate the viscoelastic properties of two clear aligner systems, Invisalign (Align Technology, Inc, Santa Clara, CA, USA) and Simpli5 (Allesee Orthodontic Appliances, Sturtevant, WI, USA), and determine if there was a difference after use. A survey assessed patients’ perceptions of the aligner material and post-treatment satisfaction. Materials/Methods: Mandibular aligners were collected from two patients after 2-3 weeks of use (n=6). Duplicate, unused aligners were obtained for each patient (n=6). Dynamic mechanical analysis (DMA) characterized the viscoelastic properties of the materials. Three tests were done on separate specimens: frequency scan (0.1-10 ...


Determination Of Dioctyl Phthalate (Dehp) Concentration In Polyvinyl Chloride (Pvc) Plastic Parts Of Toothbrushes, Ghazal Sadeghi, Elham Ghaderian, Anne O'Connor 2015 Cleveland State University

Determination Of Dioctyl Phthalate (Dehp) Concentration In Polyvinyl Chloride (Pvc) Plastic Parts Of Toothbrushes, Ghazal Sadeghi, Elham Ghaderian, Anne O'Connor

The Downtown Review

Phthalates are chemicals that are widely used in daily products and polyvinyl chloride (PVC) plastics, mainly because of their ability to enhance flexibility and durability. The presence of phthalates in various products contributes to the substantial exposure that all consumers may experience. Continuity in phthalate exposure has several side effects, including endocrine disruption, neurological damage, asthma, hormonal imbalances, obesity, infertility, genital defects, and testicular cancer. The purpose of this research experiment was to determine the Dioctyl phthalate (DEHP) concentration of PVC plastic parts of toothbrushes. The method used to conduct the experiment was Gas Chromatography/Mass Spectrometry. The result showed ...


Subgingival Air Polishing In Dentistry, Chelsea T-P. Howell 2015 Western Kentucky University

Subgingival Air Polishing In Dentistry, Chelsea T-P. Howell

Honors College Capstone Experience/Thesis Projects

Modern statistics have shown that periodontal disease is highly prevalent in today’s society. Periodontal disease has detrimental effects to the oral cavity, including: bone less, recession, and tooth mobility. A strong correlation has been linked to the use of the subgingival air polisher on patients with active periodontal disease and the regression of the disease after being treated with the device. This is being compared to traditional hand-scaling beneath the gingiva margin which is less efficient in removing biofilm subgingivally. Recent studies (Petersilka et al.) are confirming this to be true by treating patients with both hand-scaling and the ...


Bone Stimulation Implemented Using The L-Prf Technique Within The Clinical Setting In Kentucky And Tennessee, Kyndall A. Hudson 2015 Western Kentucky University

Bone Stimulation Implemented Using The L-Prf Technique Within The Clinical Setting In Kentucky And Tennessee, Kyndall A. Hudson

Honors College Capstone Experience/Thesis Projects

Leukocyte Platelet Rich Fibrin (L-PRF) is an autologous graft that is obtained from the patient’s blood. This provides a condensed network of fibrin that is saturated with cytokines, growth factors, and platelets. L-PRF speeds up the healing process and also optimizes bone grafting results.

Dental treatment options are expanding and new techniques within the office setting are constantly being developed. Present treatment modalities can assist with the stimulation of tissue formation after dental surgical procedures, leading to various results. The placement of L-PRF provides enhanced healing following specific dental procedures using the patient’s donor tissue; therefore, reducing the ...


Oral Wellness: Using Occupational Therapy To Enhance Oral Hygiene Delivery In Long-Term Care, Lauryn J. Banovitz, Liberty Bellah, Rosemarie Lion 2015 Dominican University of California

Oral Wellness: Using Occupational Therapy To Enhance Oral Hygiene Delivery In Long-Term Care, Lauryn J. Banovitz, Liberty Bellah, Rosemarie Lion

Master's Theses and Capstone Projects

Based on current literature, oral health in long-term care (LTC) facilities is frequently of low priority and does not follow evidence-based best practices. Poor oral health reduces the quality of life of older adult residents and patients and can lead to systemic diseases, such as cardiovascular disease, stroke, and pneumonia, the leading cause of death in LTC. Occupational therapists can play an instrumental role as oral care consultants, and educators, and can act as resource guides to raise the standards of oral care in LTC facilities.

This capstone project explored ways in which occupational therapy, a profession traditionally designated for ...


Comparison Of Three Different Nickel-Titanium Endodontic Rotary Systems In Shaping Simulated S-Shaped Canals, Elineida Perez 2015 Marquette University

Comparison Of Three Different Nickel-Titanium Endodontic Rotary Systems In Shaping Simulated S-Shaped Canals, Elineida Perez

Master's Theses (2009 -)

Introduction: Preparation error may result during mechanical instrumentation because of the complex anatomy of the root canal. Thus, flexibility and resistance to fracture are ideal properties that endodontic instruments should have. The aim of the study was to compare the shaping ability of three different nickel-titanium rotary instruments in simulated S-shape root canals by measuring transportation and canal volume change CVC. Materials and Methods: A total of 60 S-shaped canals in resin blocks were randomly allocated into 3 groups (n=20): Vortex Blue (Dentsply-Tulsa Dental Specialties), HyFlex CM (Coltène/Whaledent) and EndoSequence (Brasseler USA). Canals were filled with dye and ...


Effect Of Toothbrushing On Surface Roughness And Shade Of Extrinsically Stained Pressable Ceramic Restorations, Lessly Arlette Garza 2015 Marquette University

Effect Of Toothbrushing On Surface Roughness And Shade Of Extrinsically Stained Pressable Ceramic Restorations, Lessly Arlette Garza

Master's Theses (2009 -)

The purpose of this study was to investigate the effects of toothbrushing on surface roughness and shade change of extrinsically stained pressable ceramic restorations. Materials and Methods: Two materials, IPS Empress Esthetic and IPS e.max Press, were studied. For each material, 24 disc-shaped specimens, 10mm (diameter) x 3mm (height) were fabricated. Three different methods (n=8) of applying extrinsic stain was performed on each material: Glazed (G): glazed only (control); Stain then Glaze (SG): stained and fired, then glazed and fired. Stained and Glazed (T): glazed and stained together. Samples where brushed using a multi-station brushing machine. Each specimen ...


Effect Of Surface Preparation On The Shear Bond Strength Of Orthodontic Brackets Bonded To Zirconia : An In-Vitro Study, Samuel Waddoups 2015 Nova Southeastern University

Effect Of Surface Preparation On The Shear Bond Strength Of Orthodontic Brackets Bonded To Zirconia : An In-Vitro Study, Samuel Waddoups

College of Dentistry Student Theses, Dissertations and Capstones

Objectives: The purpose of this in-vitro study was to evaluate the effects of three different surface preparation methods on the shear bond strength of orthodontic brackets bonded to zirconia and determine the most appropriate method. Methods: 45 zirconia and 30 leucite-reinforced porcelain mandibular premolar crowns were divided into 5 groups and received the following surface preparations: 37% phosphoric acid and non-hydrolyzed silane, 4% hydrofluoric acid and hydrolyzed silane, microetch with 50μ Al 2 O3 particles. A universal adhesive primer containing MDP was applied and the brackets were bonded with a bis-GMA composite resin. Shear bond strength (SBS) at bond ...


Perspectives For Titanium-Derived Fillers Usage On Denture Base Composite Construction, Nidal Elshereksi 2014 Universiti Kebangsaan Malaysia

Perspectives For Titanium-Derived Fillers Usage On Denture Base Composite Construction, Nidal Elshereksi

Nidal Elshereksi

Poly(methyl methacrylate) (PMMA) is an extensively used material in dentistry because of its aesthetics, processability, and reparability. However, PMMA is still far from being ideal in fulfilling the mechanical requirements of prosthesis. PMMA-based denture base polymers exhibit low fracture resistance and radiopacity behavior. Efforts to improve the mechanical and radiopacity properties of denture base materials through inclusion of silica-based fillers are ongoing. Although silane-treated siliceous fillers are commonly used, they are not sufficiently strong.They also exhibit cracks, which either cut through the glass fillers or propagate around the filler particles. This defect occurs when the dental composites are ...


An Investigation Into The Bonding Properties Of New Generation Ceramic Brackets As Compared To A Stainless Steel Bracket, Ami Inoue 2014 Marquette University

An Investigation Into The Bonding Properties Of New Generation Ceramic Brackets As Compared To A Stainless Steel Bracket, Ami Inoue

Master's Theses (2009 -)

Introduction: More patients are seeking esthetic alternatives for their orthodontic treatment options, which has led to increased use of ceramic brackets in recent years. These brackets were marketed before independent scientific research was completed. Many of the early ceramic brackets used a silane coupling agent to allow for a chemical bond between the bracket and the adhesive resin. Early reports from clinicians of increased bond strengths and iatrogenic tooth damage after bracket removal were common. Manufacturers have made changes to their base designs, relying more on mechanical retention for bond strength. The goal of this study was to test the ...


Modification Of Ti6al4v Substrates With Well-Defined Zwitterionic Polysulfobetaine Brushes For Improved Surface Mineralization, Pingsheng Liu, Emily Domingue, David C. Ayers, Jie Song 2014 University of Massachusetts Medical School

Modification Of Ti6al4v Substrates With Well-Defined Zwitterionic Polysulfobetaine Brushes For Improved Surface Mineralization, Pingsheng Liu, Emily Domingue, David C. Ayers, Jie Song

UMass Center for Clinical and Translational Science Research Retreat

Osteoconductive mineral coatings are beneficial for improving the osteointegration of metallic orthopedic/dental implants, but achieving adequate structural integration between the surface minerals and underlying metallic substrates has been a significant challenge. Here, we report covalent grafting of zwitterionic poly(sulfobetaine methacrylate) (pSBMA) brushes on the Ti6Al4V substrates to promote the surface-mineralization of hydroxyapatite with enhanced surface mineral coverage and mineral-substrate interfacial adhesion. We first optimized the atom transfer radical polymerization (ATRP) conditions for synthesizing pSBMA polymers in solution. Well-controlled pSBMA polymers (relative molecular weight up to 26,000, PDI = 1.17) with high conversions were obtained when the ATRP ...


Chemical Dental Plaque Control: Chlorhexidine Tooth Staining And Efficacy Of Common Whitening Procedures, Zoe Kiklis 2014 Scripps College

Chemical Dental Plaque Control: Chlorhexidine Tooth Staining And Efficacy Of Common Whitening Procedures, Zoe Kiklis

Scripps Senior Theses

Chlorhexidine mouth rinses remove dental plaque from teeth, preventing dental caries, dental decay, and more serious systemic infections. Tooth discoloration due to extrinsic staining is the most prominent side effect of regular chlorhexidine use. Decreasing the concentration of chlorhexidine reduces staining area and severity. Staining can also be prevented and treated by tooth bleaching, a common cosmetic dental procedure that diminishes extrinsic staining by oxidizing chromagens adsorbed onto the tooth surface. In the proposed trial, common bleaching agents will be investigated for their efficacies in preventing chlorhexidine staining. Results of the trial could further the development of a chlorhexidine mouth ...


Reinforcement Of Flowable Dental Composites With Titanium Dioxide Nanotubes, Manal Dafar 2014 The University of Western Ontario

Reinforcement Of Flowable Dental Composites With Titanium Dioxide Nanotubes, Manal Dafar

Electronic Thesis and Dissertation Repository

Flowable composites are widely used in dentistry. However, they suffer from poor mechanical properties. The aim of this study was to reinforce a flowable composite with TiO2 nanotubes (n-TiO2), which were synthesized using an alkaline hydrothermal technique then functionalized with silane or methacrylic acid (MA). The synthesized n-TiO2 was characterized using X-ray diffraction, energy-dispersive X-ray spectroscopy and Fourier transform infrared spectroscopy. Electron microscopy revealed a tubular morphology of n-TiO2. Commercially available flowable composite was reinforced with varying amounts of nanotubes (0-5%). Dynamic Young’s moduli (E) and fracture toughness (KIC) of composites reinforced with 3 ...


Effect Of Post Materials On The Biomechanical Behaviour Of Endodontically Treated Tooth., Ahmed A. Madfa 2014 Department of Conservative Dentistry, Faculty of Dentistry, University of Thamar, Thamar, Yemen

Effect Of Post Materials On The Biomechanical Behaviour Of Endodontically Treated Tooth., Ahmed A. Madfa

Ahmed A. Madfa

Objectives: To study the stress distributions in maxillary central incisor restored with Ni-Cr custom-made, gold custom-made, prefabricated titanium and prefabricated glass fibre dental posts subjected to oblique occlusal load at 100 N. Materials and Methods: Four three dimensional finite element models of a maxillary central incisor restored with Ni-Cr (Model I), gold custom-made (Model II), prefabricated titanium (Model III) and prefabricated glass fibre (Model IV) dental posts were constructed and oblique loading of 100 N was applied. Stress analysing at the along the centre of the post and post-surrounding structure interfaces were computed. Results: The result of this study indicates ...


Alumina Ceramic For Dental Applications: A Review Article., Ahmed A. Madfa 2014 Department of Conservative Dentistry, Faculty of Dentistry, University of Thamar, Thamar, Yemen

Alumina Ceramic For Dental Applications: A Review Article., Ahmed A. Madfa

Ahmed A. Madfa

Alumina has received considerable attention and has been historically wellaccepted as biomaterials for dental and medical applications. This article reviews the applications of this material in dentistry. It presents a brief history, dental applications and methods for improving the mechanical properties of aluminabased materials. It also offers perspectives on recent research aimed at the further development of alumina for clinical uses, at their evaluation and selection, and very importantly, their clinical performance. This article also stated about the Functionally Graded Materials (FGMs) which has been conceived as a new material design approach to improve performance compared to traditional homogeneous and ...


Influence Of Taper On The Flexibility Of Nickel-Titanium Rotary Files, Christopher J. Kingma 2014 Marquette University

Influence Of Taper On The Flexibility Of Nickel-Titanium Rotary Files, Christopher J. Kingma

Master's Theses (2009 -)

Introduction: Modern nickel-titanium instruments have various tapers and have been marketed to have superior flexibility from previous generations. Current ISO standards require force measurements at a static point along the file. Unfortunately, root canal anatomy varies and produces multiple forces along the length of the file. The purpose of this study was to determine the influence of taper on the flexibility of various nickel-titanium files.

Materials and Methods: The flexibility of stainless steel hand files and nickel-titanium rotary files of various tapers was measured. The sample size was 10 for each type, taper and size. The files were measured at ...


A Comparison Of Two Methods To Articulate A Maxillary Cast With Lateral Cephalometry, Laura H. Lux 2014 Marquette University

A Comparison Of Two Methods To Articulate A Maxillary Cast With Lateral Cephalometry, Laura H. Lux

Master's Theses (2009 -)

The Kois Dento-Facial Analyzer, an arbitrary articulation system, is used by clinicians to articulate and evaluate clinical cases. There is, however, limited information for understanding how the Kois Dento-Facial Analyzer should be utilized. Dr. Kois and Dr. Lee originally patented the device in 2003 yet there is essentially no evidence-based research in the literature. The purpose of this study was to evaluate the outcomes of articulating the maxillary cast using the Kois Dento-Facial Analyzer in three-dimensions as compared to the position of the cast when using Panadent’s Pana-Mount Facebow. Fifteen dried human skulls were used as test subjects. Maxillary ...


Flexibility Of Various Nickel-Titanium Rotary Endodontic Files, Chelsea Selin 2014 Marquette University

Flexibility Of Various Nickel-Titanium Rotary Endodontic Files, Chelsea Selin

Master's Theses (2009 -)

Introduction: Nickel-titanium rotary files were originally developed to allow for greater flexibility when instrumenting root canals. The increased flexibility of nickel-titanium instruments allowed operators to negotiate canal curvatures with greater ease. File design is continually changing. Manufacturers are trying to produce files that will work more efficiently and safely. Knowing the properties of files marketed is especially important in helping to choose an appropriate file system. Current ISO standards require force measurements at a static point along the file. The purpose of this study was to evaluate the flexibility of four different nickel-titanium files at three different points along the ...


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