In this model of acute RV hypertension, aortic constriction improves cardiac function, at least in part, by altering ventricular interaction independent of changes in RCA flow. Changes in RCA flow do not appear to have a significant impact on cardiac function in this model in which coronary artery pressure was maintained at normal or increased levels.

Despite the general decline in dental caries there remain an important group of young children who have high treatment needs and for whom general anaesthesia provides a useful treatment option. Preventive strategies should be targeted towards these groups of children.

Acid-etching of enamel margins, often combined with bevelling and use of a low viscosity resin, has resulted in improved sealing of composite restorations. When enamel is absent and margins involve dentine or cementum, microleakage is more often observed. The use of glass ionomer cement, as both a restorative material and as a base combined with a veneer of composite resin, has been advocated as a means of minimizing microleakage where margins are placed in dentine or cementum. Four restorative techniques incorporating glass ionomer cement were used, in vitro, to restore cervical cavities. After thermal cycling, dye penetration was scored along occlusal and gingival margins. In all instances the gingival margin exhibited a less reliable seal than the occlusal margin. The sandwich restorations produced a superior seal at both occlusal and gingival margins when compared with glass ionomer restorative cement.

The effects of acid-etching duration on the surface of a glass ionomer cement designed for use as an intermediary layer between composite resin and dentine were investigated. Cement topography changes occurred which could be related to etch duration. When compared with enamel etched for a similar period, undue loss of cement substance was not observed for any of the etch times used.

No abstract