OBJECTIVES Marginal adaptation is important for long-term success of full-coverage restorations. The aim of this study was to determine the effect of porcelain firing cycle and different thicknesses of IPS e.max core on marginal accuracy of all-ceramic restorations. MATERIALS AND METHODS A standard stainless steel die with 0.8 mm classic chamfer finish line and 10° taper was used in this in v...

When segmenting three-dimensional medical data using level sets, re-distancing the implicit surface is time-consuming. We propose a fast implementation, based on Chamfer distance, which preserves the interface location. Experiments using synthetic and real data show reasonable accuracy and considerable speed-up. 2005 Elsevier B.V. All rights reserved.

A second-generation automated deburring cell is currently under development at the National Institute of Standards and Technology. This cell will be capable of automatically generating, from part geometry and machining information, a series of robot paths for deburring aerospace parts made from superalloys. In order to compensate for the inaccuracy of robots when following computed coordinates,...

In this letter report, core sediments from the Mt Elbert Stratigraphic Test Well #1 (Mt Elbert) located at Milne Point, Alaska were characterized in situ by high-pressure x-ray diffraction (HXRD). These samples represent part of the 500 ft (152.4 m) of continuous core collected from the D and C sands in the Mikkelson Tongue of the Canning Formation (BOSWELL et al., 2008). Research teams began c...

This paper builds on initial evidence of First Language influence on brass playing presented in Heyne and Derrick (2013) [13] by indicating how tongue positioning might affect trombone timbre. Ultrasound imaging of the tongue was used to compare vowel production and sustained trombone notes for three participants, one each of New Zealand English, Tongan and Japanese, whose musical production wa...

BACKGROUND Ceramic veneer fracture has occurred mainly at the incisal edge of the veneer because of greater stress. This study compares and evaluates the fracture resistance ceramic veneers with three different incisal preparations. MATERIALS & METHODS 15 human permanent maxillary central incisor extracted were selected which were divided into three groups of 5 each having a different Incial ...

The task and design requirements for a vision system for manipulator position sensing in a telerobotic system are described. Model-based analysis-by-synthesis techniques offer generally applicable methods with the potential to meet the system's requirement for accurate , fast and reliable results. Edge-based chamfer matching allows eecient computation of a measure, E, of the local diierence bet...

High prevalence of human herpesvirus type 8 (HHV-8) infection has been reported on the island of Sardinia. Among emigrants from Sardinia, rates of HHV-8 infection are lower than they are in Sardinia and are similar to those observed in the local population. Thus, environmental factors seem to play a relevant role in affecting the prevalence of HHV-8 infection.