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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 ...


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 ...


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 ...


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 ...


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 ...


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 ...


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

University of Western Ontario - 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 ...


Endodontic Repair Filling Materials: A Review Article., Ahmed A. Madfa 2014 Department of Conservative Dentistry, Faculty of Dentistry, University of Thamar, Thamar, Yemen

Endodontic Repair Filling Materials: A Review Article., Ahmed A. Madfa

Ahmed A. Madfa

The emergence of Mineral Trioxide Aggregate (MTA) as endodontic repair filling material has generated a lot of interest due to its superior sealing ability and biocompatibility. Although MTA possesses superior sealing ability to traditional endodontic repair filling materials, such as calcium hydroxide, but it has poor handling characteristics. A novel endodontic repair filling materials with similar chemical composition, but improved handling characteristics, was recently developed. Recently, BioAggregate repair filling materials is claimed as biocompatible material and promotes cementogenesis and forms a hermetic seal inside the root canal. More recently, Biodentine and EndoSequence endodontic repair materials introduced to the market. Both ...


Thermal Characterisation Of Poly(Methyl Methacrylate) Filled With Barium Titanate As Denture Base Material, Nidal Elshereksi 2014 Universiti Kebangsaan Malaysia

Thermal Characterisation Of Poly(Methyl Methacrylate) Filled With Barium Titanate As Denture Base Material, Nidal Elshereksi

Nidal Elshereksi

No abstract provided.


Bioerodible Calcium Sulfate Bone Grafting Substitutes With Tailored Drug Delivery Capabilities, Bryan R. Orellana 2014 University of Kentucky

Bioerodible Calcium Sulfate Bone Grafting Substitutes With Tailored Drug Delivery Capabilities, Bryan R. Orellana

Theses and Dissertations--Biomedical Engineering

Bone regeneration or augmentation is often required prior to or concomitant with implant placement. With the limitations of many existing technologies, a biologically compatible synthetic bone grafting substitute that is osteogenic, bioerodible, and provides spacing-making functionality while acting as a drug delivery vehicle for bioactive molecules could provide an alternative to ‘gold standard’ techniques.

In the first part of this work, calcium sulfate (CS) space-making synthetic bone grafts with uniformly embedded poly(β-amino ester) (PBAE) biodegradable hydrogel particles was developed to allow controlled release of bioactive agents. The embedded gel particles’ influence on the physical and chemical characteristics of CS ...


Glass-Ceramics For Non-Metallic Dental Implant Applications, Selma Saadaldin 2013 The University of Western Ontario

Glass-Ceramics For Non-Metallic Dental Implant Applications, Selma Saadaldin

University of Western Ontario - Electronic Thesis and Dissertation Repository

Metallic dental implants are an important treatment for the replacement of missing teeth. However, for esthetic and environmental issues, there is a need to develop non-metallic dental implant materials. In this thesis, two novel glass-ceramics (GCs), miserite and wollastonite, were synthesized for one-piece dental implant applications. Glasses were synthesized by wet chemical methods, followed by calcination, melting and quenching. The crystallization kinetics of these glasses were determined by differential thermal analysis (DTA). GC specimens were produced by cold pressing of the glass powder and sintering using schedules determined by DTA. The crystalline phases and microstructure of the GC samples were ...


Protaper Rotary Instrument Fracture During Root Canal Preparation: A Comparison Between Rotary And Hybrid Techniques, Huma Farid, Farhan Raza Khan, Munawar Rahman 2013 Aga Khan University

Protaper Rotary Instrument Fracture During Root Canal Preparation: A Comparison Between Rotary And Hybrid Techniques, Huma Farid, Farhan Raza Khan, Munawar Rahman

Section of Dental-Oral Maxillofacial Surgery

AIMS:

This study aimed to compare the frequency of ProTaper rotary instrument fracture with rotary (conventional) and hybrid (rotary and hand files) canal preparation techniques. Secondary objectives were to determine whether there was an association of ProTaper file fracture with the canal curvature and to compare the mean time required for canal preparation in the two techniques.

METHODS:

An in vitro experiment was conducted on 216 buccal canals of extracted maxillary and mandibular first molars. After creating an access cavity and a glide path for each canal, a periapical radiograph was taken and the canal curvature was measured with Schneider ...


Application Of Calcium Phosphate Materials In Dentistry, Ahmed A. Madfa 2013 Department of Conservative Dentistry, Faculty of Dentistry, University of Thamar, Thamar, Yemen

Application Of Calcium Phosphate Materials In Dentistry, Ahmed A. Madfa

Ahmed A. Madfa

Calcium phosphate materials are similar to bone in composition and in having bioactive and osteoconductive properties. Calcium phosphate materials in different forms, as cements, composites, and coatings, are used in many medical and dental applications. This paper reviews the applications of these materials in dentistry. It presents a brief history, dental applications, and methods for improving their mechanical properties. Notable research is highlighted regarding (1) application of calcium phosphate into various fields in dentistry; (2) improving mechanical properties of calcium phosphate; (3) biomimetic process and functionally graded materials. This paper deals with most common types of the calcium phosphate materials ...


Advantage Of Combined Amalgam-Composite Restoration: In Vitro Leakage Study, Ahmed A. Madfa 2013 Department of Conservative Dentistry, Faculty of Dentistry, University of Thamar, Thamar, Yemen

Advantage Of Combined Amalgam-Composite Restoration: In Vitro Leakage Study, Ahmed A. Madfa

Ahmed A. Madfa

Purpose: Evalute the leakage of Class II box composite restorations and compared with composite lined by flowable composite and combined amalgam-composite restoration. Method: Fifty-four Class II box shaped cavities were on the distal (1 mm below CEJ) surfaces, 18 cavities for each. Scotchbond Multi-Purpose adhesive system, Filtek Z250 composite, and a metal band system were used for all. After thermocycling test (1000 cycles, 5–55°C with 30 s) and dye immersion, the teeth were sectioned longitudinally in a mesio-distal direction and dye penetration was recorded. Results: Combine amalgam-composite restorations showed less gingival leakage than composite alone and composite lined ...


Micromechanical Analysis Of Nanoparticle-Reinforced Dental Composites, Yi Hua, Linxia Gu, Hidehiko Watanabe 2013 University of Nebraska–Lincoln

Micromechanical Analysis Of Nanoparticle-Reinforced Dental Composites, Yi Hua, Linxia Gu, Hidehiko Watanabe

Mechanical & Materials Engineering Faculty Publications

The mechanical behavior of TiO2 nanoparticle-reinforced resin-based dental composites was characterized in this work using a three-dimensional nanoscale representative volume element. The impacts of nanoparticle volume fraction, aspect ratio, stiffness, and interphase zone between the resin matrix and nanoparticle on the bulk properties of the composite were characterized. Results clearly demonstrated the mechanical advantage of nanocomposites in comparison to microfiber-reinforced composites. The bulk response of the nanocomposite could be further enhanced with the increased nanoparticle volume fraction, or aspect ratio, while the influence of nanoparticle stiffness was minimal. The effective Young’s modulus and yield strength of the composite ...


An Analysis Of Adhesion Promoters On Shear Bond Strength Of Orthodontic Brackets To Teeth, Loren Andrew Cadelinia 2012 University of Nevada, Las Vegas

An Analysis Of Adhesion Promoters On Shear Bond Strength Of Orthodontic Brackets To Teeth, Loren Andrew Cadelinia

UNLV Theses/Dissertations/Professional Papers/Capstones

Purpose:The aim of this study was to evaluate the shear bond strength of two adhesion promoters, EnhancetmLC and AssureRUniversal Bonding Resin, and their effects with two different adhesion systems (Light Bondtmand TransbondtmXT). To better understand their behavior upon failure, the amount of adhesive remnant remaining on the tooth surface was also observed.

Methods:One-hundred forty human premolars, which were extracted for reasons other than this study, were utilized and divided into seven groups of 20 teeth each. Groups A1 and B1 were bonded without adhesion promoters and with two different adhesive systems - Light Bondtmand TransbondtmXT. Groups A2 and B2 ...


Frictional Forces Of A Fixed, Esthetic Orthodontic Appliance System, Brady Michael Nance 2012 University of Nevada, Las Vegas

Frictional Forces Of A Fixed, Esthetic Orthodontic Appliance System, Brady Michael Nance

UNLV Theses/Dissertations/Professional Papers/Capstones

Purpose: The demands of an all esthetic fixed orthodontic appliance system are ever increasing in today's world. Frictional values of an esthetic, fixed orthodontic appliance system are needed to evaluate their clinical effectiveness for orthodontic treatment. The aim of this study is to evaluate the frictional values of various esthetic orthodontic archwires ligated to an esthetic orthodontic bracket.

Methods: Three types of stainless steel and nickel titanium alloy (niti) esthetic orthodontic archwires (epoxy, poly, plastic) in four sizes (.016, .018, .017 x .025, .019 x .025 inches) were ligated to both a stainless steel bracket system and a ceramic ...


Effect Of Gingival Margin Design On Retention Of Thermoformed Orthodontic Aligners, Daniel P. Cowley 2012 University of Nevada, Las Vegas

Effect Of Gingival Margin Design On Retention Of Thermoformed Orthodontic Aligners, Daniel P. Cowley

UNLV Theses/Dissertations/Professional Papers/Capstones

Purpose: The aim of this study was evaluate the effect of gingival margin design (scalloped vs. straight cut at gingival zenith vs. straight cut 2mm above gingival zenith) on the retention of thermoformed aligners. Retention of aligners is a critical requirement for efficient tooth movement.

Methods: Two thermoform aligner materials were used, Invisacryl A and Invisacryl C, in 0.040 mil (1mm) thickness. Six aligner designs were fabricated for each of the two aligner materials (12 total aligner designs). Aligner designs are scalloped, straight cut at gingival zenith (0mm), and straight cut 2mm above gingival zenith on a model with ...


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