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Biomedical subjects

H Nyborg

Publications and source records attributed to H Nyborg.

6 recordsLinked to original sources
PubMed1979

Critical analysis of a study on field dependence in young children.

Kojima's conclusion that our method of scoring performance in the rod-and-frame test did not produce satisfactory results in young children was invalid because our scoring method was used incorrectly, fallacious reasoning was used to reject our scoring method, subjects were classified wrongly, and the procedure used to test vertical perception in the children probably was unreliable.

Child↗
PubMed1977

Sex chromosome abnormalities and cognitive performance: III. Field dependence, frame dependence, and failing development of perceptual stability in girls with Turner's syndrome.

The Rod-and-Frame Test (RFT) was administered to Turner girls (N = 45), their normal sisters (N = 19), and to nonsiblings with primary amenorrhoea and growth retardation as seen in Turner girls (N = 15). The test was scored by the traditional method which gives a measure of field dependence, as well as by a new method that gives a measure of frame dependence and response inconsistency. The traditional method showed Turner girls to be extremely field dependent. The new method showed that the so-called field dependence in Turner girls was due to response inconsistency, rather than to significant frame dependence. It is concluded that response inconsistency is a characteristic of RFT performance in Turner girls, probably reflecting failing development of "perceptual stability".

Adolescent↗
PubMed1977

Pulpal reaction to polycarboxylate and zinc phosphate cements used with inlays in deep cavity preparations.

The purpose of the present investigation was to compare histologically pulpal reactions beneath inlays cemented with either a zinc phosphate or a polycarboxylate cement. No inflammatory reaction was seen beneath any of the 39 deep cavity preparations in teeth without pulpal lesions and with an inlay cemented with polycarboxylate cement. In the contralateral teeth, under 39 inlays cemented with zinc phosphate cement, an inflammatory reaction was seen beneath two cavity preparations. In one, bacteria were found on the floor of the preparation. On the basis of this result and the findings of our earlier investigations, it may be warranted to conclude that neither the polycarboxylate cement nor the zinc phosphate cement has any notable irritating effect on the pulp. If the irritation occurs after cementation of the restoration, it may be caused by debris containing bacteria and left behind on the prepared surfaces by bacterial growth from the surface of the tooth. The findings underline the importance of removing grinding debris and bacteria before cementation of the restoration.

Acrylic Resins↗
PubMed1976

Pulp reaction to a temporary zinc oxide/eugenol cement.

The pulpal irritation, such as inflammatory reaction and aspiration of pulpal cells, demonstrated after insertion of the zinc oxide/eugenol cement (Nobetec) seems to warrant the following recommendations: (1) A temporary restoration with a zinc oxide/eugenol base should not be inserted in deep cavities without a protective liner or a calcium hydroxide base covering the exposed dentinal tubules. (2) Before the temporary cementing of inlays and crowns with a zinc oxide/eugenol cement, not only should the dentin be properly cleaned and debris removed, but the prepared surfaces should be covered with a calcium hydroxide liner.

Dental Cavity Lining↗