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The whole-blood lead levels of 14-16-year-olds in a remote, unpolluted rural area (Wupperthal, north-western Cape Province) were determined. Graphite-furnace atomic absorption spectrometry was used to analyse lead levels. The mean whole-blood lead level was found to be 3,4 micrograms/dl. This value should also be considered to be representative of the(More)
It could be expected that the degree of enamel erosion by different fruits containing different kinds of organic acids, or different ratios of acids, and other different chemical components, will vary. The aim of this study was to investigate the degree of enamel erosion by different kinds of fruits (by determining the depths of enamel removed at different(More)
Plaque calcium, phosphorus, fluoride, and pH in samples obtained from 149 life-long resident children, aged from six to seven and 12 to 13 yr, from one of three naturally fluoridated communities were determined. In general, smaller amounts of phosphorus and fluoride, and larger amounts of calcium and hydrogen ions (lower pH values) are associated with(More)
OBJECTIVES This study investigated the microleakage, etching ability, and dentin-restorative interface of 2 different single-step self-etching bonding agents with compomers as restoratives. METHOD AND MATERIALS Fifteen extracted noncarious human premolars were used for each dental material system. The bonding agent Xeno III was used with their compomer(More)
AIM To evaluate and compare the in-vitro shear bond strength, microleakage and dentine-restorative interface of a self-etching/self-priming dentine bonding agent with a three-component dentine-bonding agent. METHOD For shear bond strength (SBS) testing 30 non-carious human molars were used of which 15 were tested with Non-Rinse Conditioner(More)
OBJECTIVES To compare the cytotoxicity of the polymerized bonding agents Scotchbond 1 (3M ESPE), Prime and Bond NT (Dentsply DeTrey), Xeno III (Dentsply DeTrey), and Clearfil Protect Bond (primer and bond parts; Kuraray) on mouse fibroblast cells. Xeno III was also tested through thin dentin disks. METHOD AND MATERIALS Near-confluent 3T3 cells were(More)
Although constant innovation has improved the performance of dentine adhesives, the true mechanism of resin adhesion to dentine is still not clear and the optimal dentinal surface pretreatment has yet to be determined for adhesive integrity of resin to dentine. The integrity of the collagen fibrils left exposed upon acid etching seem to play a major role in(More)
PURPOSE To determine whether marginal adhesion is sensitive to different irradiation parameters, we investigated the in vitro adhesion values of four dental resins on metal surfaces. METHODS Four groups of eight specimens each of Z250, Filtek flow, Dyract AP and Dyract flow were placed in pre-treated stainless steel cavities and irradiated using different(More)
Lead has no metabolic role in the human body and its presence is associated with various toxic effects. Several countries have responded to this health hazard reducing petrol lead additives or entirely eliminating them. Studies have shown that there has been a resultant fall in blood lead levels of the particular populations. This study reports on the(More)