The effect of strip, tray and office peroxide bleaching systems on enamel surfaces in vitro.

Unlabelled: Improvement of the appearance of teeth by whitening systems is one of the goals of modern esthetic dentistry. Vital tooth bleaching is administered in a variety of forms including trays, strips and paint-on gels. The concentrations and conditions of bleaching systems vary considerably between these treatment forms.

Foetal and neonatal foal losses on equine herpesvirus type 1(EHV-1) infected farms before and after EHV-1 vaccination was introduced.

On 6 farms with a history of EHV-1 abortions the overall prevalence of losses due to abortion, stillbirth and neonatal foal mortality during 5 foaling seasons preceding the introduction of vaccination against EHV-1 were compared with corresponding data for 8 subsequent seasons in which all horses were immunized with a modified live EHV-1 vaccine. Although both sporadic and epizootic EHV-1 abortions occurred in immunized mares, the numbers of foetal and neonatal foal losses decreased significantly (chi 2 = 15.75; p less than 0.