Strength-limiting damage in lithium silicate glass-ceramics associated with CAD-CAM
| Autor: | Sydney Veldhuis, Yilan Guo, Nyssa Rae, Ysidora Torrealba Martinez, Dan L. Romanyk, Owen Addison, Garry J.P. Fleming, Slobodan Sirovica |
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| Rok vydání: | 2018 |
| Předmět: |
Ceramics
Fabrication Materials science Annealing (metallurgy) Surface Properties medicine.medical_treatment 02 engineering and technology Lithium 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Machining Materials Testing Surface roughness medicine General Materials Science Ceramic Composite material General Dentistry Silicates 030206 dentistry 021001 nanoscience & nanotechnology Microstructure Dental Porcelain Silicate chemistry Mechanics of Materials visual_art visual_art.visual_art_medium Computer-Aided Design Zirconium 0210 nano-technology Dental restoration |
| Zdroj: | Dental materials : official publication of the Academy of Dental Materials. 35(1) |
| ISSN: | 1879-0097 |
| Popis: | Objective The fabrication of all-ceramic restorations using Computer Aided Design and Computer Aided Manufacturing (CAD–CAM) most commonly involves subtractive machining which results in strength-limiting, surface and sub-surface damage in the resultant prosthesis. The objective was to explore how clinically relevant machining-process variables, and material variables, affect damage accumulation in lithium silicate glass-ceramics. Methods Three commercial lithium silicate glass-ceramics (IPS e.max® CAD, Celtra® Duo and Vita Suprinity®) were selected. For each material, two groups of disk-shaped specimens were fabricated (n = 15), using a CAD–CAM process, creating surfaces equivalent to those generated for a dental restoration, or alternatively, using a highly controlled laboratory process generating disk-shaped test specimens with a consistent polished surface. Bi-axial flexure strength (BFS) was determined in a ball-on-ring configuration and fractographic analyses performed. For each material BFS was correlated with machining sequence and with surface roughness. Results BFS was significantly influenced by material substrate (p Significance All CAD–CAM specimens showed evidence of machining introduced damage in the form of median and radial cracks at sites either coincident with, or peripheral to the failure origin. Subtractive machining introduced significant strength limiting damage that is not eliminated by heat treatments applied for either microstructure development (IPS e.max® CAD and Vita Suprinity®) or annealing/crack blunting (Celtra® Duo). |
| Databáze: | OpenAIRE |
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