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Biomedical subjects

L L Harman

Publications and source records attributed to L L Harman.

4 recordsLinked to original sources
PubMed1983

Porosity in boilable acrylic resin.

An acrylic resin developed to be processed by boiling for 20 minutes in water was compared to a conventional heat-processed acrylic resin for porosity when processed according to the manufacturer's directions. No porosity was found in the conventional resin in thicknesses up to 19.5 mm. The boilable resin developed porosity in thicknesses of 6 mm and greater. The porosity increased with increased thickness. The boilable resins should not be used for long-term prostheses or those requiring a thickness of acrylic resin that approaches 6 mm.

Acrylic Resins↗
PubMed1980

Posterior peripheral seal distortion related to height of the maxillary ridge.

A statistically significant positive relationship exists between ridge height of a cast and dimensional changes in the posterior peripheral seal region of its denture base. This dimensional change might be clinically insignificant, but it should not be ignored. The relationship between distortion of the denture base and composition of the denture teeth is not significant. The relationship of distortion of the denture base at the region of the posterior peripheral seal and variables of ridge height and tooth composition were studied. A positive relationship exists between ridge height and distortion, but no significant relationship was found between dimensional change and the use of porcelain or acrylic resin teeth. Using computer analysis, an equation, table, and curve were derived for values of expected dimensional change in the posterior peripheral seal region related to various ridge heights.

Acrylic Resins↗