This study aims to elucidate the relationships between the flexural strength and surface topography of composite resin blocks, utilized for the CAD/CAM system, after milling in various step-over amounts. The rectangular specimens were milled from CAD/CAM blocks with step-over amount 0.01, 0.02, 0.05, 0.1, and 0.2 mm; further, a three-point bending test was conducted to reveal the flexural strength. The surface morphology after milling was assessed by a 3D laser microscope. The surface roughness significantly decreased by reducing the step-over amount. Although there was significant association between the surface roughness and flexural strength by the Pearson correlation, the 95% confidence intervals of the flexural strength were between the mirror-polished and sand-blasted groups. These results suggest that a precise step-over amount enables us to obtain a smooth surface. Furthermore, the flexural strength of the rough surface milled by a large step-over amount caused no damage to the composite resin for CAD/CAM crown.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.4012/dmj.2019-385 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Comparative Analysis of Conversion and Crosslinking Degree in Bulk-Fill, Monochromatic, and ORMOCER composites.
J Dent
January 2025
University of Saskatchewan, College of Dentistry. 107 Wiggins Rd, Saskatoon, SK, Canada. S7N 5E5. Electronic address:
Bulk-fill, monochromatic, and ORMOCER composites were introduced in restorative dentistry with the aim of reducing clinical time and/or alleviating contraction stresses at the interface between the tooth and restoration. While the conversion and immediate properties of these materials are comparable to conventional composites, studies evaluating their long-term properties and the structure of the polymer matrix are lacking. The objective of this study was to evaluate the degree of conversion and, indirectly, the crosslink density of conventional, bulk-fill, monochromatic, and ORMOCER resin composites.
View Article and Find Full Text PDFEcological concrete by partially substitution of cement with Cameroonian corn stover ash.
Heliyon
January 2025
Mechanics Laboratory, Doctoral Training Unit in Engineering Sciences, Doctoral School of Fundamental and Applied Sciences, University of Douala, P.O. Box: 2701, Douala, Cameroon.
This study focuses on the influence of the partial substitution of cement by Cameroonian corn stover ash (CCSA) on the physical and mechanical behavior of concrete. For this, as materials used, one has first the corn stovers coming from the Bandjoun town in the Koung-khi division, in the West region of Cameroon, which are used to obtain the ashes, while the sand used, came from the Sanaga River in the coastal region of Cameroon. In order to obtain the CCSA, the corn stover is calcined in an oven at 600 °C for 6 h and then characterized; the characterization included infrared spectrometry, X-ray fluorescence spectrometry, fineness of grinding, and absolute density.
View Article and Find Full Text PDFSustainable application of waste gangue mortar in coal mine tunnel support.
Sci Rep
January 2025
School of Urban Planning and Municipal Engineering, Xi'an Polytechnic University, Xi'an, 710048, China.
With the increase in coal mining depths, soft and fractured roadway surrounding rocks require grouting and a sprayed protective layer for maintenance. Simultaneously, extensive accumulation of coal gangue causes diverse environmental issues. To enhance on-site coal gangue utilization, this study replaced river sand and cement with coal gangue to develop a novel cement-based mortar for supporting coal mine roadways.
View Article and Find Full Text PDFEffect of crystallization temperature on the flexural strength of lithium disilicate glass ceramics.
J Prosthodont
January 2025
Division of Prosthodontics, Department of Restorative Sciences, University of Minnesota, Minneapolis, Minnesota, USA.
Purpose: This pilot study aimed to compare the flexural strength of Amber Mill CAD to IPS e.max CAD and to determine the impact of different crystallization protocols on the flexural strength of Amber Mill CAD ceramics.
Materials And Methods: Amber Mill CAD ceramic blocks of a known Vita Classic shade were selected for testing against control IPS e.
Comparative In Vitro Analysis of Fracture Toughness and Flexural Strength in Interim Fixed Partial Dentures Reinforced With Various Nanofibers.
Cureus
December 2024
Prosthodontics and Crown and Bridge, The Oxford Dental College, Bengaluru, IND.
Aim To evaluate and compare the fracture toughness and flexural strength of interim fixed partial dentures reinforced with carbon, glass, and Kevlar nanofibers. Materials and methods This study explored the effect of reinforcing poly methyl methacrylate with carbon, glass, and Kevlar fibers on its fracture toughness and flexural strength. A total of 120 samples were prepared, divided into two groups of 60 samples each, with one group tested for fracture toughness and the other for flexural strength.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!