(1) Background: The properties of CAD/CAM resin-based composites differ due to differences in their composition. Instrumented indentation testing can help analyze these with respect hardness, as well energy-converting capabilities viscoelastic behavior. (2) Methods: Eleven materials were investigated using instrumented testing. Indentation depth (hr), Martens hardness (HM), (HIT), modulus (EIT)...

OBJECTIVE The objective of the present study is to evaluate and compare the flexural strength, dynamic elastic moduli and true hardness (H(o)) values of commercial Vita In-Ceram alumina core and Vita In-Ceram matrix glass with the standard aluminous porcelain (Hi-Ceram and Vitadur), Vitadur N and Dicor glass and glass-ceramic. METHODS The flexural strength was evaluated (n=5) using 3-point lo...

Of particular importance and interest are the effects of pulsed Nd:YAG laser beam welding parameters on penetration and microstructure characterization of DP1000 butt joint, which is widely used in the automotive industry nowadays. Some key experimental technologies including pre-welding sample preparation and optimization design of sample fixture for a sufficient shielding gas flow are perform...

Effects of the electrical flame off (EFO) parameters on the hardness and work hardening properties of Cu free air balls (FABs) are reported and compared to those of Au. Cu FABs were characterised using an online deformability method that measures the insitu deformability of the Cu FAB and by traditional off-line Vickers microhardness testing of cross-sectioned samples. The online deformability ...

Erosive tissue-loss in dental enamel is of significant clinical concern because the net loss of enamel is irreversible, however, initial erosion is reversible. Micro-hardness testing is a standard method for measuring initial erosion, but its invasive nature has led to the investigation of alternative measurement techniques. Optical coherence tomography (OCT) is an attractive alternative becaus...

This work deals with the planning and fabrication of a functionally gradient coppernickel composition via Laser Metal Deposition (LMD). Various compositions of copper and nickel were made by blending different weight percentages which were then sequentially deposited to fabricate functionally gradient copper-nickel thin-wall structures. Analyses were performed by sectioning the thin-wall sample...

STATEMENT OF PROBLEM Two potential problems commonly identified with a denture base incorporating a resilient liner are failure of the bond between acrylic resin and soft liner material, and loss of resiliency of the soft liner over time. Since patients may drink different beverages, it is important to evaluate their effects on physical properties of soft lining materials. PURPOSE The objecti...

Grain hardness characteristics for a range of corn hybrids were measured using a modified Stenvert Hardness Test (SHT). A computer-based data logging and analysis system was constructed to obtain the milling time and transient power consumption during the milling process, from which milling energy and peak power demand were calculated. In addition, the time taken to mill 17 ml of flour (resista...

Thermomigration experiments were conducted to study the change in mechanical properties of 95.5Sn–4Ag–0.5Cu (SAC405) lead-free solder joint under high temperature gradients. This paper presents some observations on samples that were subjected to 1000°C /cm thermal gradient (TG) for 286 h, 712 h, and 1156 h. It was observed that samples subjected to thermal gradient did not develop a Cu3Sn inter...

Multicomponent formulations coupled with complex processing conditions govern the final properties of photopolymerizable dental composites. In this study, a single test substrate was fabricated to support multiple formulations with a gradient in degree of conversion (DC), allowing the evaluation of multiple processing conditions and formulations on one specimen. Mechanical properties and damage...