COMMENTARY. tear strength of five elastomeric impression materials at two setting times and two tearing rates

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/73584/1/j.1708-8240.2008.00177.x.pd

Ceramic component reliability with the restructured NASA/CARES computer program

The Ceramics Analysis and Reliability Evaluation of Structures (CARES) integrated design program on statistical fast fracture reliability and monolithic ceramic components is enhanced to include the use of a neutral data base, two-dimensional modeling, and variable problem size. The data base allows for the efficient transfer of element stresses, temperatures, and volumes/areas from the finite element output to the reliability analysis program. Elements are divided to insure a direct correspondence between the subelements and the Gaussian integration points. Two-dimensional modeling is accomplished by assessing the volume flaw reliability with shell elements. To demonstrate the improvements in the algorithm, example problems are selected from a round-robin conducted by WELFEP (WEakest Link failure probability prediction by Finite Element Postprocessors)

Color of Denture Resins

The color of 24 commercially available denture resins was determined visually with Munsell color tabs and by reflection spectrophotometry. Correlation between Munsell and spectrophotometric data was found. The resins characterized for Black patients had a higher degree of specular reflectance and were more opaque than resins for Caucasians.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/68003/2/10.1177_00220345770560070901.pd

Apparent Modulus of Elasticity of Dental Amalgams

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/66932/2/10.1177_00220345750540043301.pd

Parameters that Affect the Color of Denture Resins

The effect of specular reflection, background color and specimen thickness on the color of four commercial denture resins was studied by reflection spectrophotometry. Higher values of luminous reflectance and excitation purity were obtained with a white than with a black background, whereas dominant wavelength was lowered slightly.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/66710/2/10.1177_00220345770560110601.pd

Wear of Fluorapatite Single Crystals: I. A Method for Quantitative Evaluation of Wear

A quantitative method for characterizing the surface failure of nonmetallic single crystals under sliding was evaluated. It was found that strain rate, load, and slider design influenced the wear of natural fluorapatite single crystals. High loads and slider designs with small radiuses and sharp angles resulted in the deepest penetration.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/67060/2/10.1177_00220345720510011201.pd

Physical Properties of Pit and Fissure Sealants

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/67086/2/10.1177_00220345790580042701.pd

In vitro Accelerated Aging of Composites and a Sealant

The in vitro accelerated aging of conventional and microfilled composite restorative materials and a sealant was studied. Volume loss/surface area ranged from 2.0 to 7.3 x 10-3 mm3/mm2 after 900 h of aging. Surface morphology changed more dramatically for the conventional composites than for the other materials. Changes in surface chemistry as measured by FTIR-ATR were observed.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/67091/2/10.1177_00220345810600090701.pd