Showing papers in "Dental Materials in 2004"

TL;DR: Microscope investigation and X-ray diffraction revealed the important role played by the tetragonal to monoclinic phase transformation and by the relationship between the glassy matrix and the crystalline phase in the strengthening and toughening mechanisms of these ceramics.

TL;DR: Morphological evaluation revealed that RelyX Unicem only superficially interacted with enamel and dentin, and that application using some pressure is required to ensure close adaptation of the cement to the cavity wall.

TL;DR: Comparing three hot-pressed glass-ceramics and alumina glass-infiltrated ceramics, processed by both slip casting and dry pressing, revealed the relationship between the glass matrix and the crystalline phase and the characteristics of the latter were correlated to the strengthening and toughening mechanisms of these glass- Aceramics.

TL;DR: The aim of this study was to investigate the flexural properties of different types of FRC posts and compare those values with a novel FRC material for dental applications, and found commercial prefabricated FRC Posts showed lower Flexural properties than an individually polymerised FRCMaterial.

TL;DR: It can be concluded that for some products, aging of composites in water leads to color instability and opacity variation.

TL;DR: Advice is provided based on the current literature to minimize the impact of bleaching therapies on restorative materials and restorations.

TL;DR: The hypothesis that surface flaws and microcracks are induced by the grinding of crowns are tested to analyze the material removal and the grinding-induced surface layer as well as to estimate the crack size caused by machining yttria stabilized tetragonal zirconia polycrystals (Y-TZP).

TL;DR: Tension side reinforcement was most effective in increasing the load to initial and final fracture in fiber-reinforced composite (FRC).

TL;DR: The ultimate tensile strength (UTS) of enamel (E), dentin (D) and dentin-enamel junction (DEJ) is determined using the microtensile technique using human third molars to hypothesized that the UTS of dental structures varies according to location and nature.

TL;DR: The MTT assay was found to be more sensitive than the LDH assay, particularly when lower doses of the tested monomers were determined, and the ranking of TC 50 concentrations correlated with the calculated logP values.

TL;DR: The validated model indicated that shrinkage stress cannot be based on composite properties or restoration configuration alone, but has to be approached as a distributed pattern that depends on the location and on the properties of tooth and restoration, geometry, constraints, and restoration procedures.

TL;DR: Lower acetone concentrations, as could be anticipated from solvent evaporation during clinical use of the bonding agent, did not seem to lower MTBS, but rather improved the integrity of the dentin/adhesive bond.

TL;DR: Complementary kinetic studies confirmed the effect of cure temperature on increasing the polymerization rate in dental composites as significant and increased rates and conversion could lead to improved properties of composite restorative materials.

TL;DR: An increase in strength was found, especially at the early curing time, which can improve the survival rate of GICs in the clinical situation and Ultrasonic excitation can be used as a 'command' set method and improves the properties of G IC at early setting time.

TL;DR: The results suggested that the extent of theGlass-ionomer matrix of the glass filler played an important role for fluoride-releasing and recharging abilities of the resin-based materials.

TL;DR: The c-factor is an influencing factor for dentin adhesion, however, using an appropriate layering technique, high bond strengths to deep cavity floors can be achieved.

TL;DR: In the ceramic-inlay models, the greatest von Mises stress was observed on the lateral walls, vestibular and lingual, of the cavity, and indirect resin-composite inlays performed better in terms of stress dissipation.

TL;DR: This study quantified and visualized the pattern of cuspal deformation pattern of the occlusal portion of molars for various cavity types and sizes after restoration with a light-initiated composite.

TL;DR: The silanated ceramic surface exhibited a lower surface energy and did not enhance bonding to the liquid resin by work of adhesion, which yielded a lower WA than water.

TL;DR: It is indicated that a self-adhesive universal resin cement without pre-treatment can provide a marginal adaptation at dentin which is comparable to established luting agents.

TL;DR: Numerical analyses show an effective correspondence with in vivo experimental tests, in literature, on tooth mobility caused by the application of intrusive loads, and leads to a valid definition of tooth movement by means of an effective numerical procedure.

TL;DR: Different denture lining materials exhibit different properties in terms of susceptibility to yeast penetration, although the initial attachment is comparable, and the selection of appropriate materials for a given function, and their fabrication may affect performance.

TL;DR: The higher mean sigma and KIC values of E2 and ES core ceramics suggest potentially improved structural performance compared with E1 although the Weibull moduli of E1 and E2 are the same.

TL;DR: The minimal extent of cure required by the base of a Class 2 resin composite restoration that allows it to support the rest of the restoration and maintain its marginal seal under simulated clinical conditions was determined.

TL;DR: The results suggest that light-transmitting posts may have a limited utility when judged against a Knoop Hardness ratio criterion.

TL;DR: Hardness at the resin surface was not significantly different between LED and conventional curing lights, however, below the surface, hardness reduced more rapidly for the LED lights, especially at depths beyond 3 mm.

TL;DR: The ultrasonic test method is a valuable mechanical characterization tool and was able to statistically discriminate between the chemical and structural differences within dental ceramic materials.

TL;DR: This study revealed that stress relaxation prior to vitrification stage did not provide a significant benefit towards the reduction of overall shrinkage stress since, to achieve clinically relevant conversion, the majority of theshrinkage stress is developed during and after the vitrified stage, which does not permit stress relaxation on the time scales used in this study.

TL;DR: The present study shows that second generation LEDs have the potential to replace halogen LCUs if the composites are selected carefully and confirmed that the depth of cure test does not discriminate between LCU's performance for composites containing co-initiators, but the Knoop hardness test does.

TL;DR: Results suggested that bleaching enamel with CP could significantly reduce its UTS within a 14 days treatment.