Learn More
OBJECTIVES To investigate the influence of short- and medium-term immersion on water uptake and mechanical properties of a so-called 'nanofilled' compared with a conventional resin-based composite (RBC). METHOD For each material (a microhybrid, Filtek Z250, FZ and 'nanofilled' RBC, Filtek Supreme in body and translucent shades, FSB and FST; 3M ESPE, St.(More)
A novel method is described for the non line-of-sight coating of hydroxyapatite onto polyurethane reticulated foam and titanium discs. This utilises a biofilm of Serratia sp. NCIMB 40259 which, when challenged with a solution containing calcium chloride and phosphatase substrate, manufactures biofilm-bound material identified as hydroxyapatite by X-ray(More)
Three-hundred and seventy-two porcelain laminate veneers were fitted to defective and discoloured teeth in 102 patients. Ninety per cent of the restorations were fitted to unprepared teeth. Restorations were reviewed up to 78 months after cementation. Survival probabilities were calculated using the Kaplan-Meier method. Results showed higher rates of(More)
STATEMENT OF PROBLEM Different fiber types are available for reinforcing composite restorations. Little information exists regarding optimal fiber type/bonding agent combinations. PURPOSE This in vitro study examined the influence of storage time and 2 fiber wetting agents on the flexural properties of an indirect dental composite reinforced by 3 fiber(More)
OBJECTIVES The proportions of dentine powder and modelling fluid employed to produce a "creamy" porcelain slurry consistency used in veneer construction are assessed by the technical experience of the operator so that variability is inevitable. The present study investigated the implications of mixing variability on the slurry consistency used in the(More)
A strain of Serratia sp. showed intracellular electron-transparent inclusion bodies when incubated in the presence of citrate and glycerol 2-phosphate without nitrogen source following pre-growth under carbon-limitation in continuous culture. About 1.3 mmol citrate were consumed per 450 mg biomass, giving a calculated yield of maximally 55% of stored(More)
OBJECTIVES To investigate the differences in the reliability of three-point flexure strength (TFS) and bi-axial flexure strength (BFS) data of a dental resin-based composite (RBC) irradiated by a hand-held or an oven light-curing unit (LCU). METHODS Three-point bar-shaped (25 x 2 x 2 mm3) and bi-axial disc-shaped (12 mm diameter, 2 mm thick) specimens of(More)
INTRODUCTION The effect of photoinitiator and co-initiator chemistry on the setting reaction and degree of conversion of dental resin-based composites (RBCs) has rarely been determined explicitly. This work examines the effect of type and concentration of photoinitiator and co-initiator on the rate of change of light transmission throughout polymerisation(More)
OBJECTIVES Conventional approaches to comparing dental cements use standard property tests under manufacturers' specified conditions. Zinc phosphate cements are supplied in powder/liquid form and manipulation frequently involves mixing the components by eye so a range of mixing ratios will inevitably occur in practice. Unfortunately, the physical, chemical,(More)
PURPOSE To investigate the extent of bonding possible of a resin luting cement with three opacities of Belleglass HP, representing different filler type and loading levels in a highly cross-linked resin matrix. MATERIALS AND METHODS Belleglass HP (3 opacities: opaque dentin, translucent dentin, cuspal enamel) was prepared as solid notched discs (Group A)(More)