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Biomedical subjects

E C Combe

Publications and source records attributed to E C Combe.

At least 73 records · Page 4Linked to original sources
PubMed1985

Silicone materials for ear impressions.

Comparative properties have been determined for some commonly used ear impression materials (condensation reaction silicones) and some recently developed dental products (addition reaction silicones). Experiments have included measurement of dimensional stability, weight change on storage, viscosity, syringing characteristics, the energy required to tear the material and the stress relaxation characteristics. The major finding is that of the superb dimensional stability of the addition-cured silicones, which show no significant shrinkage over time. This is in contrast to a linear shrinkage of the order of 0.5% over a 48-hour period for the condensation silicones.

Dental Impression Materials↗
PubMed1983

The development of modified denture base materials.

This work has been undertaken in an attempt to develop improved materials for the construction of dentures. In particular, a material was sought that would combine radiopacity with high impact resistance. Eight particulate radiopaque glasses were prepared and incorporated into poly(methyl methacrylate) denture base material, and the properties of the resultant composites were measured. Experiments were also carried out with glass fiber fillers, which were found to increase impact strength. It was shown that the incorporation of both a particulate radiopaque glass and glass fiber, 20% of each, yielded composites with improved properties.

Dental Materials↗
PubMed1983

Initial physical tests of aluminoborate cements in the context of periodontal dressing development.

A new glass ionomer cement system (aluminoborate) is under consideration for dental applications, including the possibility of a periodontal dressing material. Following the development of pertinent adhesive and rheological tests, two experimental formulations were selected by a simple screening procedure and subjected to appropriate adhesive tests. One formulation proved satisfactory and was subjected to a rheological test in addition. The possible role of aluminoborates as periodontal dressing materials is discussed.

Adhesiveness↗
PubMed1981

Factors affecting the adhesion of polycarboxylate cement to enamel and dentin.

The adhesive bond strength of polycarboxylate cement with enamel and dentin and the factors affecting the adhesion of the cement to both structure were studied. A thick cement film reduced the tensile and shear bond strengths of the cement. Although surface roughness reduced the tensile bond strength of the cement, it significantly increased the shear bond strength. The application of the cement under pressure increased its shear bond strength. Surface treatment with 4% sodium fluoride solution for 5 minutes, 4% stannous fluoride solution for 2 minutes, and a 10% suspension of calcium hydroxide for 5 minutes significantly increased the shear bond strength of the cement with dentin.

Acid Etching, Dental↗