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Biomedical subjects

J Cohen

Publications and source records attributed to J Cohen.

At least 757 records · Page 42Linked to original sources
PubMed1994

The power of counselling--for better or worse?

Counselling is an extremely powerful tool, a vital skill to acquire in general practice today. Nevertheless, it must be used wisely and not prescribed wholesale. This article discusses counselling in general practice in relation to a series of cases where a presentation of nightmares disguised underlying repressed traumas.

Adult↗
PubMed1994

The effect of eugenol containing and non-eugenol temporary cements on the resin-enamel bond.

This study was undertaken to compare the effect of eugenol containing and non-eugenol temporary cements on the bond strength of three brands of luting cements to enamel. Flat enamel surfaces were prepared on 90 surgically removed, unerupted, human third molar teeth. The teeth were randomly divided into three groups of thirty. The flat enamel surfaces in two of the groups were treated with either a eugenol containing or non-eugenol temporary cement and the third group was left untreated. The teeth were stored in water for 7 days and the cements then removed and all surfaces etched. The teeth were divided into 9 sub-groups of 10 each and one of the three resin cements was then bonded to each sub-group. The relevant shear bond strengths were determined after 7 days. The results indicated that prior use of a eugenol containing temporary cement reduced the resin cement-enamel bond strengths. No differences were found between the bonds achieved by the three brands. It was concluded that eugenol containing temporary cements should not be used prior to bonding with resin luting cements.

Analysis of Variance↗
PubMed1994

Shear and tensile bond strengths of two resin cements to a high gold alloy: an in vitro study.

The shear and tensile bond strengths of two resin cements to a high gold alloy with differently prepared surfaces were compared. Eighty buttons were cast from Argident Yellow 1 (gold 83.5 per cent). The surfaces of 40 buttons were sandblasted and the rest were silicoated. Forty cylinders each of F21 and Panavia EX were bonded to the prepared gold alloy surfaces and the specimens stored in distilled water for 24 hours. Half the specimens were then tested to failure using a shear test and the other half using a tensile test. The two cements achieved significantly higher shear and tensile bond strengths to the silicoated metal surfaces. Both cements attained similar shear bond strengths, but F21 achieved significantly stronger tensile bonds than Panavia EX to the differently treated metal surfaces. It is concluded that silicoating of high gold alloys is preferable to sandblasting for resin retention, and that bond strength data from different test methods are not comparable.

Analysis of Variance↗