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Biomedical subjects

J Rajstein

Publications and source records attributed to J Rajstein.

14 recordsLinked to original sources
PubMed1984

The effect of ultrasonic scaling on the surface of Class V amalgam restorations--a scanning electron microscopy study.

Class V cavities were prepared on twelve extracted teeth and then filled with amalgam which was condensed in six cases by hand and six by mechanical means. SEM records were obtained before and after ultrasonic scaling of the restored area. They showed that such scaling had a deleterious effect on the surface of the amalgam and its marginal integrity. However the mechanically condensed specimens were less affected.

Dental Amalgam↗
PubMed1979

The grinding efficiency of diamond burs.

Deterioration of round diamond burs during 8 minutes of operation was found to be more pronounced for burs with low particle densities than for burs with high particle density. No definitive relationship was found between the initial grinding rate and initial particle density.

Dental Enamel↗
PubMed1979

A study of the contour and external surface of class V composite resin fillings.

Twenty-five Class V Composite-resin, Adaptic fillings were prepared on extracted human teeth under five different matrices. White stones and flame diamonds were used as polishing devices. The smoothest surface was obtained with celluloid strip and the most acceptable contour obtained with preformed matrix.

Composite Resins↗
PubMed1979

In vitro evaluation of enamel and cementum abrasion after toothbrushing.

Abrasion in human teeth brushed with toothbrush and dentifrice was evaluated quantitatively by SEM. Specimens which included surface enamel and cementum were cut from unerupted wisdom teeth. Controlled brushing was carried out by a brushing machine, with dentifrice or saline, for periods of five and ten minutes. Scratches were counted using SE micrographs. No scratches were observed on the enamel surfaces, due probably to its hardness. The cementum surfaces revealed scratches, the number increasing with the duration of burshing. Brushing with saline was much less abrasive than with dentifrice. It was concluded that damage to the cementum is caused primarily by the dentifrice, brushing per se being a minor factor.

Adult↗