Apparatus for measuring wear of dental restorative materials

McKinney, John E.

doi:10.1016/0043-1648(82)90072-2

Cited by 17 publications

(8 citation statements)

References 4 publications

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“…Wear tests were made on a fully automatic, before pre-conditioning, and pf is the final value taken seven three-station, pin-and-disc apparatus (McKinney, 1982), where days later, at which time pre-conditioning is taken arbitrarily the disc was the specimen and the pin, the counterface. Type to be complete.…”

Section: Methodsmentioning

confidence: 99%

Chemical Softening and Wear of Dental Composites

1985

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The purpose of this work was to determine the influence of chemical food-simulating liquids on the wear of various commercial dental composite restoratives. In many cases, pre-conditioning the restoratives in these liquids for one week produced swelling of the polymer matrix and considerable surface damage. The resulting degradation reduced the hardness and enhanced the wear as measured by a pin-and-disc apparatus. Four kinds of commercial composites were investigated: a conventional quartz-filled, a strontium-glass-filled, a visible-light-activated, and a microfilled composite. The liquids employed were heptane and several aqueous solutions of ethanol with solubility parameters, delta, ranging from delta = 1.5 to 4.8 X 10(4) J1/2m-3/2. With all restoratives, the decline in hardness during pre-conditioning maximized at about delta = 3 X 10(4), which corresponds to a 75% ethanol solution. The wear behavior was considerably more complicated and variable, as discussed in the text. For the most part, the increase in wear rate from pre-conditioning corresponded to the fall in hardness. A notable exception was for the strontium-glass-filled composite pre-conditioned in pure water. Here the wear was enhanced considerably, with no decrease in hardness. In this case, the degradation mode is assumed to be different from the others in that it is attributed to stress corrosion of the glass filler.

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Section: Methodsmentioning

confidence: 99%

Chemical Softening and Wear of Dental Composites

1985

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“…This apparatus, which is similar to that used at the National Bureau of Standards (McKinney, 1982), is a pin (stylus) on rotating disc (restorative) device with five independent stations. Each station consists of a sample cup containing the restorative material to be tested and a stylus against which the material is worn.…”

Section: Methodsmentioning

confidence: 99%

Comparative in vitro Sliding-wear Study of Conventional, Microfilled, and Light-cured Composite Restoratives

et al. 1984

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The sliding-wear behavior of a number of commercially available microfilled and light-cured composite restoratives has been investigated and compared with the wear characteristics of conventional composites. The surface profiles of the composite restoratives, both pre- and post-test, have also been examined in order to study material attrition processes. The results indicate that: (1) microfilled composites are significantly more resistant to sliding wear than are restoratives containing conventionally-sized filler particles; (2) light-cured, microfilled composites exhibit a lower rate of sliding wear than do self-curing, microfilled restoratives; and (3) the wear process leads to an increase in surface roughness for all materials tested, but microfilled materials display lower surface roughness values, both before and after sliding-wear tests, than do restoratives containing conventional-sized filler particles.

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“…Among the different designs, a pin-on-disk wear-test rig has been commonly used to simulate two-body wear between the specimen and the antagonist. Though the method appears simple and relatively quick in producing results (McKinney, 1982), the repeatability of results using the same test conditions (i.e. load, contact pressure, sliding speed) remain poor (Perry et al ., 2000).…”

Section: In Vitro Testingmentioning

confidence: 98%

“…Several different simulation models are reported in the literature ranging from 'scratch' tests (Harrison et al ., 1979), where the depth of wear and mechanism applied by a scratch were evaluated using scanning electron microscopy (SEM), to the 'pin-on-disk' wear testing regime (McKinney, 1982), which employed the relative movement between test specimen and abrasive antagonist (Krecji et al ., 1999), and more advanced chewing simulators based on the Ivoclar Vivadent method (Scheibenbogen et al ., 1998), Zurich method (Krejci et al ., 1990), Oregon Health Sciences University Oral Wear Simulator (Ferracane et al ., 1999), Munich Method, and ACTA method (De Gee and Pallav, 1994). While a majority of these models provide comparative rankings of the dental materials, few have elucidated the wear mechanisms of the investigated materials.…”

Section: Wear Simulation Modelsmentioning

confidence: 99%