Biomedical subjects

David R Cagna

Publications and source records attributed to David R Cagna.

3 recordsLinked to original sources

PubMed2002

Characteristics and porcelain bond strength of (Ti,Al)N coating on dental alloys.

The effect of a novel titanium-aluminum nitride film, or (Ti,Al)N film, on the bond strength between a dental porcelain and two nickel-based dental alloy substrates was investigated. A thin layer of (Ti,Al)N film was deposited on flat metal samples using a reactive radio-frequency sputtering method. A uniform thickness of porcelain was applied to the film- coated metal samples. Metal-ceramic specimens were subjected to three-point bending, and failure loads were recorded. Bond strengths between the porcelain and (Ti,Al)N-coated metal alloys ranged from 159.0 +/- 11.7 N to 278.0 +/- 12.3 N. These values were significantly greater (p< 0.05) than bond strengths recorded for control samples that did not incorporate the (Ti,Al)N film. An electron probe microanalyzer with a line profile mode was used to characterize the interface between the (Ti,Al)N film and the porcelain. Results of this investigation suggest that the (Ti,Al)N film (1) increases the flexural bond strength between dental porcelain and nickel-based alloy substrates by permitting elemental diffusion, (2) interferes with the surface oxide formation that characteristically originates from the nickel-based metal alloy substrate, and (3) provides an appropriate oxide layer for porcelain application.

Alloys↗

PubMed2002

Relining extension-base removable partial dentures.

Modern prosthodontic therapy must continue to address the inevitable consequence of tooth loss--that is, alveolar process atrophy. The use of removable partial dentures (RPDs) to treat partial edentia must rely, in part, on support from the ever-deteriorating edentulous ridges. Extension-base RPDs are particularly affected as the tissue-base relationship changes over time after extraction of the natural teeth. This article reviews the concept of observed changes in the residual edentulous alveolar ridge and conventional procedures used to compensate for this bone loss. Finally, a practical procedure is presented which uses convenient and accurate materials that can be readily incorporated into the modern dental practice.

Aged↗

PubMed2002

Removable prosthodontic therapy and xerostomia. Treatment considerations.

Successful management of complete and removable partial dentures is complicated by a reduction in saliva. Dental practitioners should be aware of the signs and symptoms of xerostomia, available diagnostic procedures, likely etiologies, expected sequelae, and appropriate therapeutic regimens. Effective evaluation and appropriate treatment will promote acceptable levels of comfort and function. Over-the-counter (Figure 12) and prescription medications may be needed to improve the clinical situation.

Adult↗