Showing papers in "Dental Materials in 1989"

TL;DR: An exponential regression of the results measured for each property as a function of the volumetric filler fraction was appraised and an excellent correlation was found with each property.

TL;DR: The results suggest that the early (one-hour) mechanical properties of the hybrid material exceed those of glass ionomer, and surface crazing, a documented problem with some glass ionomers when they become desiccated, is alleviated with this hybrid formulation.

TL;DR: The present results suggest that cast Ti alloys have promising features for future dental uses as well as a strong passivity trend in the corrosion test.

TL;DR: Five visible-light-cured experimental resins without fillers were prepared and staining of these resins was colorimetrically measured to study the effects of the surface characteristics of resins on staining.

TL;DR: Six materials were investigated: Aurafill, Silar, Concise, Heliomolar, P-30, and Occlusin, and results ranged from 0.9 to 2.24 volume percent, with current concern for industrial hygiene, the water-filled dilatometer may have advantages.

TL;DR: It appears that the filler-matrix interface provides paths of facile diffusion similar to grain boundary diffusion in the water sorption of dental composites.

TL;DR: The specific aim of the study was to determine the effect that food-stimulating solvents have on varyingly constituted resin composites and glass ionomer.

TL;DR: The wear of enamel when opposed by different ceramic systems was investigated by use of an artificial oral environment and it was found that the wear mechanisms for Cerestore and Ceramco porcelains were similar, but were distinctly different from that of Dicor.

TL;DR: Three- and four-point bend-testing were compared, with four different dental polymers used, and the values for modulus of elasticity determined by the two tests were not statistically different, suggesting that that parameter is dependent on the testing procedure.

TL;DR: There was no statistically significant difference in bond strength for either Scotchbond or Gluma on dentin with a smear layer in the presence or absence of 32 cm of hydrostatic pulpal pressure.

TL;DR: General linear modeling revealed that the best combination tested was roughening with a D830 diamond bur, conditioning the surface with water, and priming with Scotchbond-1 dentin bonding agent.

TL;DR: Analysis of data indicates that visible-light-cure lamps do cause a temperature rise within the pulp chamber--a higher rise the longer the lamp is used, and air lowers the temperature generated.

TL;DR: On the presumption that tooth motion routinely occurs over a wide range of sliding rates, the stainless steel couple produced the lowest and the most consistent coefficients of friction, whereas the beta-titanium wire on stainless steel flats produced the highest and themost erratic coefficient of friction.

TL;DR: The wall-to-wall polymerization contraction of three composite resins, provisionally accepted by the American Dental Association for use in posterior teeth, was investigated in dentin cavities prepared in extracted human teeth to investigate the hygroscopic expansion and the low efficacy of the dentin-bonding agents.

TL;DR: The purpose of this study was to re-arrange the master Bioform shade guide into a long-range one-dimensional color system based upon color difference, and found the sequence according to color difference provided the better agreement with visual perception.

TL;DR: The copper-based and the beryllium-containing nickel alloys exhibited significant surface alterations after exposure to either solution, and the potential of elevated release of ions to the oral cavity and to the target organs by some of the investigated alloys should be considered.

TL;DR: A rapid-cure polymerization of cure, including a terminal boil, with respect to transparency, residual monomer, mechanical properties, and generation of gaseous porosity found that in order for porosity-free resin to be produced during rapid curing, a low concentration of benzoyl peroxide initiator in the powder component is vital.

TL;DR: The alloy selection in both conventional and high-copper categories significantly influenced the survival of the restorations for reasons directly related to the restoration.

TL;DR: Results indicated that the glass-ionomer materials were generally stronger than the calcium hydroxide liners and Prisma VLC Dycal showed the lowest value for modulus of elasticity and the least acid solubility.

TL;DR: The objective of this study was to determine the amount of wear for the USPHS alfa-bravo transition on the basis of cast comparison data.

TL;DR: Determination of the temperature changes at the surface of a restoration in the mouth indicated that in vivo temperature change is more likely to increase the depth of diffusion of oral fluids than to cause microcracking of the surface.

TL;DR: The relationship between dentin permeability and the shear bond strength of Scotchbond/Silux was investigated and it was found that after removal of the smear layer with acids, there was an inverse relationship between Dentin permeabilities and dentin bond strength.

TL;DR: In this in vitro study, large rectangular cavities were prepared on the proximal surfaces of human premolars with cervical margins placed beyond the cemento-enamel junction with resin composite to produce contraction gaps at the cervical wall.

TL;DR: Water desorption results were compared with various proprietary materials, and it appeared that values of D increased more rapidly in cases where large proportions of plasticizer resulted in samples which were above their glass transition temperature, Tg, at the temperature of testing water sorption.

TL;DR: Comparisons of permeability and shear bond strengths of occlusal vs. buccal dentin before and after removal of the smear layer with 6% citric acid and after substitution of the Smear layer by topical oxalate treatment found that smear layer removal increased dentin permeability, and this result was completely reversed by oxalates treatment.

TL;DR: Ceramography confirms the martensitic (displacive) nature of the transformation from high (cubic) to low (tetragonal) leucite upon cooling upon cooling, and identifies the crystalline phases in eight commercial dental porcelains in both powder (unfired) and sintered forms.

TL;DR: The optimum surface texture was obtained with diamond instruments (with progressively smaller particle sizes) used at a moderate speed with water, followed by a 30-fluted carbide bur at high speed and dry, then diamond polishing paste on a webbed rubber cup.

TL;DR: A new hybrid photo-cured anterior composite with a smaller filler particle size was found to have comparable sorption and solubility behavior but a tensile strength superior to that of a conventional-cure composite.

TL;DR: There was a great variation in the wear rates of the tested materials, with the greatest wear shown by resins used for base material and the smallest by gold and Cr-Co alloys and porcelain.

TL;DR: These four acidic monomers are considered to be effective as self-etching primers for dentin bonding procedures by measuring the maximum contraction gap of the visible-light-curing composite in the cylindrical dentin cavity mediated by the bonding agent.