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Biomedical subjects

K R Kofford

Publications and source records attributed to K R Kofford.

4 recordsLinked to original sources
PubMed2001

Advances in restorative materials.

This article has presented basic up-to-date information concerning the selection, properties, and clinical uses of current restoratives that are tooth colored and adhesive. This area in dentistry is advancing at an exponential rate, and it is essential that all practitioners pay constant attention to the information about all materials as they appear on the market. Coupled with a thorough knowledge of treatment planning and case design, results such as seen in Figure 4 make restorative practice a rewarding endeavor for clinicians and patients. Interest in the scientific background, development, and performance of restorative materials must be at a high level to avoid being snared by advertising promises.

Adhesives↗
PubMed2001

Aluminum oxide air abrasion particles: a bacteriologic and SEM study.

OBJECTIVE: The objective is to determine if aerobic and anaerobic sampling yields viable biologic contaminants in the aluminum oxide air abrasion powder as delivered by the manufacturer and to determine mean particle size for comparison with the published size from manufacturers and the range of sizes in the powders. METHOD AND MATERIALS: Samples from 15 unopened aluminum oxide powder containers from 9 different manufacturers were plated on aerobic and anaerobic culture media. The cultures were incubated at 35 degrees C and observed at 24-hour intervals. Samples of each of the 15 groups were subjected to scanning electron microscope (SEM) examination. Photomicrographs were obtained and a range and mean particle size determined. RESULTS: Aerobic and anaerobic cultures demonstrated no growth in any of the samples. Mean particle size determined by SEM for 25- to 27.5-micron particles ranged from 27.3 microns to 32.0 microns with standard deviations from 1.06 microns to 7.70 microns. Mean particle size for 50 microns particles ranged from 51.6 microns to 59.7 microns with standard deviations of 5.48 microns to 14.80 microns. CONCLUSION: Aluminum oxide powders as delivered by manufacturers appeared to be free from viable microorganisms. The powder mean particle sizes approximate the labeled sizes closely enough such that they should perform properly in air abrasion tooth preparation.

Aluminum Oxide↗
PubMed1998

The effect of autoclaving and polishing techniques on energy transmission of light-curing tips.

OBJECTIVE: The purpose of this study was to investigate if autoclaving light-curing tips in sterilization packages using a properly maintained autoclave filled with distilled water reduced the buildup of boiler scale and allowed the tips to maintain their ability to transmit energy. METHOD AND MATERIALS: Thirty light-curing tips were divided into groups: control, never autoclaved; group 1, no light-curing tip treatment, autoclaved only; group 2, autoclaved and treated with the Demetron/Kerr Optics Maintenance Kit; group 3, autoclaved and treated with the EFOS Fiberoptic Cleaning Kit; group 4, autoclaved and treated with Shofu Brownie and Greenie polishing points; and group 5, autoclaved and treated with a standard rubber prophylaxis cup. The curing tips were packaged and subjected to 30 autoclave cycles in a clinical autoclave with standard loads of clinical instruments. The light transmission was measured with a curing radiometer. RESULTS: Results showed a 7% decrease in energy transmission for the untreated tips compared to the control. Both polishing system groups demonstrated a 4% decrease. There was no significant difference between the control and the first three groups. The polishing point and prophylaxis cup groups showed significantly decreased energy transmission (decreases of 11% and 25%, respectively). CONCLUSION: Light-curing tips can be autoclaved with routine packaged loads of clinical instruments and retain their ability to transmit light energy, provided that the tips are packaged and the autoclave is properly maintained and filled with distilled water. Commercially available optics maintenance kits are effective in removing deposits and restoring light energy transmission.

Analysis of Variance↗