Dental Materials Commons^™

Catechol-Containing Copolymers As An Active Ingredient For Denture Adhesives, Vincent Ying Wun Kong

Electronic Thesis and Dissertation Repository

Moisture inside the mouth adds challenge to making denture adhesives formulations. Some formulations have zinc to enhance adhesion on wet skin despite knowing the health hazards. Inspired by mussel foot proteins’ catechol unit’s strong underwater adhesion, nine catechol-containing copolymers (P1A-P3C) were synthesized by free radical polymerization of 3,4-dimethoxystyrene (3,4- DMS) with different styrene derivatives followed by deprotection. P1A-P3C were used to make Fn(P)-C-PBS denture adhesive formulations which had suitable shear stresses around ≥ 5 kPa satisfying ISO 10873. In-situ NMR studies of free radical polymerization of 3,4 - DMS and styrene derivatives allowed computation of their reactivity ratios showing all …

Biodegradable Nano-Hybrid Polymer Composite Networks For Regulating Cellular Behavior, Charles Henley Sprague

Masters Theses

Photo-crosslinkable polymeric biomaterials have emerged in the field of biomedical research to promote tissue regeneration. For example, scaffolds that can be crosslinked and hardened in situ have been known to make suitable implant alternatives. Since injectable and photo-crosslinkable biomaterials offer the advantage of being minimally invasive, they have emerged to compete with autografts, a current highly invasive method to repair diseased tissue. A series of novel photo-crosslinkable, injectable, and biodegradable nano-hybrid polymers consisting of poly(ε-caprolactone fumarate) (PCLF) and polyhedral oligomeric silsesquioxane (POSS) has been synthesized in our laboratory via polycondensation. To engineer the material properties of the nano-hybrid networks, varied …

Hydroxyl-Terminated Poly(Urethane Acrylate) As A Soft Liner In Dental Applications: Synthesis And Characterization, Selda Keskin

ABSTRACT: Hydroxyl-terminated poly(urethane acrylate) s were synthesized for use in biomedical applications. Acrylate end capping via an interesterification reaction was successfully achieved with methacryloyl chloride addition to the hydroxyl ends of the polyurethane at low temperatures. 2,4-Toluene diisocyanate, 1,6-hexane diisocyanate, and methylene diphenyl diisocyanate were used as diisocyanates for urethane synthesis, and they were end-capped with methyl methacrylate and hydroxyethyl methacrylate. The nature of the monomers that we used had an effect on the thermal and morphological properties that were interpreted in terms of the level of hydrogen bonding and the degree of phase separation. The synthesized polymers were characterized …

Microtensile Bond Strength Of Self-Adhesive Resin-Based Dental Cement, Selda Keskin

This study investigated the effectiveness of bleaching agents on the micro tensile bond strength (mTBS) of self-adhesive luting cement and enamel. A total of 126 samples were prepared from the labial surfaces of permanent human maxillary central incisors and assigned into three groups with 42 samples each as: control, enamel bleached with 10% hydrogen peroxide (HP), and enamel bleached with 10% carbamide peroxide (CP). Rely X Unicem1 (3 M, ESPE) was used as self-adhesive resin cement. The total testing period for bleaching was selected as 14 days and the bleaching agents were applied 8 hours a day. The statistical one-way …

Effect Of Au And Au@Ag Core-Shell Nanoparticles On The Sers Of Bridging Organic Molecules., Remziye Guzel Dr., Zafer Ustundag Dr., Haslet Eksi, Selda Keskin Dr., Bilge Taner, Zeynep Durgun, Ali Osman Solak Prof. Dr.

No abstract provided.

Effects Of Different Denture Cleansers On The Tensile Bond Strength Of Denture Liners, Selda Keskin

The effect of two denture cleansers (Polident1 and Protefix1) on the tensile bond strength between four soft liner materials (Molloplast B1, Permaflex1, Sofreliner Tough Medium1, and GC Reline Soft1) and a conventional denture base resin was investigated. For each of the liner materials 35 test specimens were prepared according to test the requirements and assigned into seven groups (n¼5). Before tensile testing, five of the liner specimens were kept in water or soaked in two cleansing solutions during 2 and 7 d. Five other samples served as a control group subjected directly to tensile testing. The bond strength values were …

Synthesis And Characterization Of Poly(Allyl Methacrylate) Obtained By Free Radical Initiator., Selda Keskin

Allyl methacrylate was polymerized in CCl4 solution by a,a0-azoisobutyronitrile at 50, 60, and 708C. The kinetic curves were autoaccelarated types at 60 and 708C, but almost linear at 508C. Arrhenius activation energy was 77.5 kJ/mol. The polymer was insoluble in common organic solvents. It was characterized by FT-IR, NMR, DSC, TGA and XPS methods. About 98–99% of allyl side groups were remained as pendant even after completion of the polymerization. The spectroscopic and thermal results showed that polymerization is not a cyclopolymerization type, but may have end group cyclization. The high molecular weight is the main cause of a polymer …

The Evaluation Of Some Flexural Properties Of Denture Base Resin Reinforced With Various Aesthetic Fibers, Selda Keskin

No abstract provided.

Evaluation Of Laser Treatment On Reline-Base Composites, Selda Keskin

No abstract provided.

Bond Strength Of A Silicone Soft Lining Material To Pol(Methyl Methacrylate) Resin Treated With Maleic Anhydride And Its Terpolymers, Selda Keskin

No abstract provided.

The Effect Of Esthetic Fibers On Impact Resistance Of A Conventional Heat-Cured Denture Base Resin, Selda Keskin

No abstract provided.

Flexural And Bonding Properties Of A Denture Base Polymer Treated With Nitric Acid Or Ultraviolet Radiation Before Relining With Molloplast-B, Selda Keskin

No abstract provided.

The Effects Of Some Methacrylate Monomers Used As Liquid Component On Tensile And Flexural Strengths Of A Poly (Methyl Methacrylate) Denture Base Resin., Selda Keskin

No abstract provided.