Showing papers in "Dental Materials in 1995"

TL;DR: Adhesion testing of dentin bonding agents was reviewed starting with the adhesion substrate, dentin, the variables involved in etching, priming and bonding, storage variables and testing variables, and several recent reports attempting to standardize many of these variables were discussed.

TL;DR: Water is inferior as a solvent for HEMA-based dentin primers and gives both lower bond strength and requires longer priming time than acetone, which may explain the ability of water to interfere with the polymerization of the resin systems.

TL;DR: It is emphasized that an understanding of actual clinical failure modes is absolutely necessary before results of in vitro strength testing can be considered to have clinical validity.

TL;DR: This study used finite element analyses to model the planar shear bond test and to evaluate the effects of modulus values, bonding agent thickness, and loading conditions on the stress distribution in the dentin adjacent to the bonding agent-dentin interface.

TL;DR: This study suggests that the amount of released monomer can be diminished by storing the PMMA product in water for at least 1 d before use, preferably at +37 degrees C.

TL;DR: Curing shrinkage of most of the resin-modified glass ionomers was greater than the hybrid composite and the chemical-cured glass ionomer cement and all of the examinedGlass ionomer materials had a higher total water content than the composite.

TL;DR: The purpose of this paper is to provide the background for assessing the mechanical reliability of brittle materials under tensile strength.

TL;DR: This paper describes the most useful equations of fracture mechanics to be used in the failure analysis of dental biomaterials.

TL;DR: This paper addresses the application of quantitative fracture surface analysis to basic research, material and product development, and "trouble-shooting" of in-service failures.

TL;DR: Bond strength to dentin and the temperature change were greatly affected by the filler level, and there were strong correlations between the bond strength and temperature change of experimental bonding agents.

TL;DR: Evaluation of the effect of different dwell times during long-term thermocycling in microleakage analysis of bonded restoratives found no significant differences in the extent of dye penetration at the tooth restoration interface for the thermocycled composite restorations when compared to composite other specimens with no thermocy cycling.

TL;DR: The results of this study suggest that certain fluoride gels may replenish fluoride within some glass ionomers and thus prolong their cariostatic potential.

TL;DR: Improvements in some of the properties of composites produced by heat-treating are of only short-term benefit, and are for the most part negated due to an alteration of the resin matrix as the composite equilibrates with water.

TL;DR: The results of this study show the influence of water sorption on the development of setting shrinkage stress in bonded glass ionomer cements and whether the conversion of contraction stresses into expansion stresses as observed for the resin-modified products, is beneficial for a restoration requires further study.

TL;DR: The observed spectra revealed increases in the principal absorption bands for the components of the three composite systems, which may contribute to irreversible material degradation.

TL;DR: The evidence from this study demonstrated that the specimen volume method can be used to determine the extent of resin cure of thin film or bulk resin specimens, and represents an easily performed procedure that could be used by all investigators without expensive equipment.

TL;DR: Variations in the mechanical properties are interpreted as being due to plasticization of the resin matrix by water, which appears to lower the yield stress and increase in the size of the plastic zone ahead of the crack, thereby causing the observed increase in G(c) and K(c).

TL;DR: Diversity in structure of both composites and glass ionomers does not allow findings for one product to be extrapolated to other similar products, and all composites tested show a decrease in Young's modulus following water sorption.

TL;DR: The concept of incorporating disinfectants into model stone as a standard operating procedure for impressions of unknown history and, most sensibly, all dental impressions is supported.

TL;DR: Significant differences existed between the two bond test methods for all materials with enamel and three of the five cements when bonded to dentin, and the shear test results were always the higher of the two test methods.

TL;DR: The results revealed that an inverse linear relationship tended to exist between filler level and fatigue resistance of the composite materials beyond a certain level of filler content, with composites with considerably low or high filler content were significantly low in fatigue resistance.

TL;DR: Topical fluoride solutions can cause stress corrosion cracking of commercially pure titanium, and the cold-rolled specimen exposed to the fluoride solution exhibited a brittle fracture, while the unexposed specimen was ductile in nature.

TL;DR: Macrophages react adversely to metal ions at similar concentrations as other cell types found in the oral cavity, and the concentrations which affect cell metabolism and protein production are generally lower than those which lyse the cells.

TL;DR: The removal of totally bonded tooth-colored posterior restorations made of composite and ceramic is more technically demanding and more time-consuming than the removal of glass ionomer and amalgam restoration.

TL;DR: Through well designed experiments coupled with a reliability analysis, rational design decisions can be made that ensure the successful use of ceramics in demanding structural applications.

TL;DR: Adding fluoride to the solution made the titanium potential more active and enhanced the corrosion of titanium in combination with high-copper amalgams, and surface alterations were occasionally observed on wet-ground titanium specimens.

TL;DR: Substantial differences in the gas permeability of the molds were found, including Bellavest T produced poorly filled molds, Rematitan Plus and Titanium Vest resulted in poor margins and Titavest CB produced complete castings.

TL;DR: Immediately following light activation, the upper layers of each material were harder than the deeper layers, but the degree of cure in the deeper layer improved over time, suggesting that VariGlass has less effective chemical-cure mechanisms than the other materials tested.

TL;DR: The highest level of bond strength and durability to dental noble metals was achieved using a mixture of thiophosphoric and phosphoric methacrylates and benzoyl peroxide.

TL;DR: Strong, durable bonds can be achieved between composite and sandblasted cpTi, thus enhancing the usefulness of this metal for esthetic resin-veneered crowns and other fixed prosthetics.