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Medical AI Inquiry: You was designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.  Labels: OBJECTIVE, METHODS, RESULTS. Meshes: Aluminum Silicates, Ceramics, Computer-Aided Design, Crowns, Dental Bonding, Dental Implants, Single-Tooth, Dental Materials, Dental Models, Dental Porcelain, Dental Prosthesis, Implant-Supported, Dental Restoration Failure, Dental Stress Analysis, Humans, Materials Testing, Microscopy, Electron, Scanning, Resin Cements, Stress, Mechanical, Surface Properties, Titanium.
user
Do fatigue resistance of 2 different CAD/CAM glass-ceramic materials used for single-tooth implant crowns? Context: To evaluate the fatigue resistance of 2 different CAD/CAM in-office monoceramic materials with single-tooth implant-supported crowns in functional area. A metal experimental model with a dental implant was designed to receive in-office CAD/CAM-generated monoceramic crowns. Laterally positioned axial dynamic loading of 300 N at 2 Hz was applied to implant-supported crowns machined from 2 different glass materials for 100,000 cycle. Failures in terms of fracture, crack formation, and chipping were macroscopically recorded and microscopically evaluated. Four of 10 aluminasilicate glass-ceramic crowns fractured at early loading cycles, the rest completed loading with a visible crack formation. Crack formation was recorded for 2 of 10 leucite glass-ceramic crowns. Others completed test without visible damage but fractured upon removal.
assistant
Lack in chemical adhesion between titanium abutment and dental cement likely reduces the fatigue resistance of machinable glass-ceramic materials. However, relatively better fractural strength of leucite glass-ceramics could be taken into consideration. Accordingly, progress on developmental changes in filler composition of glass-ceramics may be promising. Final Decision: yes