The effects of lubrication on the temperature rise and surface finish of glass-ionomer cements

Journal of Dentistry
C S JonesG J Pearson

Abstract

Previous work [Jones CS. Factors influencing the finishing of direct filling materials. PhD Thesis, University of London; 2002] has shown that there is an optimum load, speed and time that produced the smoothest surface when finishing glass-ionomer cement using each of four grades of a disc system. This study looks at the effects of lubrication on the temperature produced in samples of GIC when finished dry and with different lubricants using these optimal loads, speeds and times. It also compares the surface finish produced using different lubricants. A thermocouple connected so that it permitted the display and recording of temperature against time was inserted 1mm into the base of samples of a glass-ionomer cement. The samples were finished and polished using each of the grades of a disc system in a specially constructed jig that mimicked oral finishing. After roughening, the pre-determined optimum loads, speeds and times were used sequentially for each of the four grades of disc. Five samples were tested for each method of finishing. Firstly run dry, then in turn lubricated with water, walnut oil and petroleum jelly. After the use of each abrasive disc the surface roughness was measured using a profilometer. One of the five...Continue Reading

References

Nov 1, 1967·Journal of Dental Research·A W AplinF M Sorenson
Sep 1, 1968·Journal of Dental Research·G J Christensen, W E Dilts
Feb 18, 2004·British Dental Journal·C S JonesG J Pearson

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