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Biomedical subjects

R Strang

Publications and source records attributed to R Strang.

86 records · Page 5Linked to original sources
PubMedDate not supplied

The effect of dentine on fluorescence measurements of enamel lesions in vitro.

This study aimed to determine the contribution of the underlying dentine and the enamel-dentine junction to measurements of mineral loss from enamel recorded using quantitative light fluorescence (QLF). Sixteen square blocks (5 x 5 mm) were cut from the labial surfaces of extracted bovine incisor teeth. A dental drill was used to remove dentine and the enamel-dentine junction from half of each specimen. All specimens were embedded in epoxy resin and ground to produce a smooth, flat enamel surface. Half of the enamel surface of the block, perpendicular to where the dentine had been removed, was demineralised for 72 h prior to undertaking QLF measurements from the enamel surface to compare fluorescence loss from different areas of the block. QLF readings taken from lesions with no underlying dentine or enamel-dentine junction were very similar to readings from lesions with underlying dentine. A comparison of the two data sets demonstrated a linear relationship with a gradient of 0.95 and a y intercept of -1.24 (r(2) = 0.936). From these data, the underlying dentine and enamel-dentine junction did not influence mineral loss in enamel measured using QLF.

Animals↗
PubMedDate not supplied

In vitro assessment of the microleakage around preventive resin (laminate) restorations.

The purpose of this study was to evaluate in vitro, the microleakage of laminate restorations using two resin systems and the influence of etching and curing regimen on the leakage. A total of 135 extracted, human third molars with similar occlusal dimensions were chosen. Cavities were prepared and the teeth were then separated into nine groups of fifteen teeth each. The incidence of microleakage in this study varied between no leakage and 46.7 percent. Leakage of preventive resin restorations was reported to occur in 16.7 percent to 25 percent of cases. The fact that the variables tested in this study had no significant effect on the microleakage would suggest that the leakage is dependent on that of the fissure sealant. The group restored with a fissure sealant containing releasable fluoride and an adhesion promoter performed well in this study.

Acid Etching, Dental↗