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At least 19 recordsLinked to original sources
PubMed1989

Hardness tests in highly filled composite resins.

The hardness of seven proprietary, light-cured, posterior composite resins was evaluated by three different hardness testers: the Knoop hardness tester, the Barcol indenter and the Rockwell 15T hardness meter. Specimens were measured after light-curing and 24-hour immersion in 37 degrees C water. Barcol hardness numbers ranged from 79.2 to 85.0. The Rockwell 15T hardness data had a range from 73.3 to 80.3 and the Knoop hardness numbers varied from 39.9 to 79.0. Relatively small variations were determined between results of Barcol hardness numbers and Rockwell 15T hardness data. Great variation was revealed in the results from Knoop hardness numbers. According to the dimensions of the indentations, the results of Barcol and Rockwell hardness represent the bulky part of tested composites rather than superficial hardness. Knoop hardness testing is found to be relatively feasible and a suitable measurement for the determination of superficial hardness of highly filled composite resins.

Composite Resins↗
PubMed1977

Hardness testing of some fissure-sealing materials.

The mechanical properties of fissure-sealing materials are of significant importance for their durability, i.e. their wear resistance. One of the methods of evaluating a material's resistance to attrition is to apply a hardness test. In the present investigation, the surface hardness of some fissure-sealing materials was tested. Sealants made from diluted composite materials and with inclusion of inorganic filler particles appeared to have a considerable higher surface hardness than the other sealing materials tested.

Composite Resins↗
PubMed1978

Creep and hardness testing of some denture base polymers.

A method of measuring creep, recovery, hardness, and the effect of cyclic loading on denture base polymers using a modified Wallace hardness tester is described. This apparatus is particularly sensitive and is capable of detecting very small variations in these properties of the materials. A representative group of denture base polymers that include heat-cured, pour-type, and other modified materials was tested. The results obtained are in good agreement with those shown by other workers.

Denture Bases↗