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Biomedical subjects

V A Marker

Publications and source records attributed to V A Marker.

25 records · Page 2Linked to original sources
PubMed1985

Effects of sputtered metal oxide films on the ceramic-to-metal bond.

The application of a thin oxide film is seen as a method of improving the ceramic-to-metal bond. Using sputter coating to form oxide films allows control of its thickness. The thickness of the oxide layer can also be controlled by sputter coating. Films produced by sputtering, in themselves, have superior bond strengths in that the high-energy levels that are used in the technique drive the coating material into the atomic lattice of the substrate material (dental gold). Remaining to be determined are optimum film thickness and the oxide to be used. However, the present study opens a field of study showing promise of improving porcelain-to-metal bonding in dental restoration.

Adhesiveness↗
PubMedDate not supplied

Implant materials, designs, and surface topographies: their effect on osseointegration. A literature review.

The aim of this article was to review the literature on materials, designs, and surface topographies of endosseous dental implants. The different categories of dental implants and the parameters of their design were analyzed in relation to their effect and significance in the process of osseointegration. The events that immediately follow implantation were described, emphasizing the factors that play a role in the development of the bone-implant interface. In addition, the methods and techniques that allow qualitative and quantitative evaluation of the interfacial zone were reviewed and their clinical correlation was assessed.

Dental Implantation, Endosseous↗
PubMedDate not supplied

Evaluation of cutting patterns produced with air-abrasion systems using different tip designs.

This study assessed cavity preparations produced with different air abrasion tip parameters. Twelve test groups of extracted teeth were prepared to evaluate the parameters of 80 degrees or 45 degrees nozzle angles and 0.38 or 0.48 mm inner tip diameters. All other factors were held constant. A device was made to hold the specimen and air abrasion handpiece that standardized the distance and position relative to the tooth and time of application. The cavities were evaluated by assessing the rounding of the cavosurface margins and cavity floor. Measurements of cavosurface angles and the angle of concavity were made at the deepest portion of the abraded surface using scanning electron micrographs. The cavosurface angles were compared using paired t-test, and the effects of the tip design parameters were analyzed by ANOVA and Duncan's Multiple Range test. From the cavity patterns found in this study, the authors suggest that 80 degrees angle tips are more appropriate than 45 degrees angle tips for making narrow, deep cuts for preventive resin restorations. Conversely, when shallow preparations are needed, as in the case of Class V cavity preparations, cutting patterns of 45 degrees angle tips are more suitable.

Adult↗
PubMedDate not supplied

Effects of Candida treatment regimens on the physical properties of denture resins.

Denture stomatitis affects approximately 65% of all denture wearers and Candida albicans has been established as a primary etiologic agent. Treatment of the condition necessitates removal of the organism from denture resins by soaking in cleansing/disinfecting solutions. These solutions can have deleterious effects on denture resins. Physical properties (flexure strength and surface hardness) of heat- and light-polymerized denture resins (Lucitone Pink and Triad) were evaluated after candidal colonization and candidal treatment regimens. Light-activated resins may be the materials of choice for patients prone to denture stomatitis, as they have demonstrated less overall degradation from candidal treatment modalities.

Acrylic Resins↗