crazing


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craz·ing

(krā'zing),
In dentistry, the appearance of minute cracks on the surface of plastic restorations such as filling materials, denture teeth, or denture bases.
The development of minute cracks on plastic prosthetics and restorations—e.g., filling materials, teeth, or base

crazing

(krāz′ĭng)
Minute fissures on the surface of natural or artificial teeth.

craz·ing

(krāz'ing)
In dentistry, appearance of minute cracks on surface of plastic restorations such as filling materials, denture teeth, or denture bases.
References in periodicals archive ?
Under impact conditions, chain scission is likely to become important (37), thus it can be speculated that crazing will be favored and voiding and fibrillation will be aided by the scission processes rather than by viscous disentanglement via repetition, as occurred in slow strain-rate tests such as tensile test.
However, it is noted that while crazing evidence was observed in each of the pressure deflection tests, ultimate failure occurred by yielding and drawing of remaining material ahead of the notch.
As the constraint was reduced, multiple crazing continued to blunt the tip but it was also accompanied by the formation of large voids.
For crazing, the energy barrier comes from the requirement of the polymer molecules to slide past one another (via reptation) and to undergo conformational changes.
The first analysis was performed with a constant crazing stress of 40 MPa and included experimental variables of relative craze density and strain rate.
Among processes of craze initiation to breakdown, craze tip advance and craze thickening are especially important since they are responsible for the major part of the energy dissipation during crazing and thus directly influence polymer toughness.
The technique to be described in the present work is an in-situ, quantitative, non-subjective, direct measurement of craze density (amount of surface crazing per unit surface area).
This article examines whether Izod impact strength can be improved by lowering the crosslinking degree of the rubber of MOD in a PVC/MOD molded product to make rubber void at the time of formation of the first craze, followed by a suppression of the final crack formation, and also whether Lzod impact strength can be improved by initially making rubber particles in MOD void to facilitate crazing and shear yield, followed by a suppression of the final crack formation.
Also, it is possible to learn whether or not limited crazing can trigger massive shear banding in the polymer matrix.
Largely deformed rubber particles and crazing were observed near the surface of the whitened fractured section nearest the notch (Fig.
Qualitatively, the essential micro-mechanisms of yielding and fracture in rubber-modified polystyrene include: craze nucleation, rubber cavitation, formation of elastomeric fibrils, which prevent the crazing from coalescing, and, finally, fibril breakdown, which leads to macroscopic crack propagation.
13) found that crazing occurred at a lower strain for annealed or slowly cooled samples than for freshly quenched samples.