Rosentritt, Martin and Behr, Michael and Thaller, Christian and Rudolph, Heike and Feilzer, Albert (2009) Fracture performance of computer-aided manufactured zirconia and alloy crowns. QUINTESSENCE INTERNATIONAL, 40 (8). pp. 655-662. ISSN 0033-6572,
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Objective: To compare the fracture resistance and fracture performance of CAD/CAM zirconia and alloy crowns. Method and Materials: One electrophoretic deposition alumina ceramic (Wolceram, Wolceram) and 4 zirconia-based systems (ce. novation, ce. novation; Cercon, DeguDent; Digizon, Amann Girrbach; and Lava, 3M ESPE) were investigated. A porcelain-fused-to-metal method (Academy, Bego Medical) was used in either conventional casting technique or laser sintering. Sixteen crowns of each material were fabricated and veneered with glass-ceramic as recommended by the manufacturers. Crown and root dimensions were measured, and 8 crowns of each system were adhesively bonded or conventionally cemented. After the crowns were artificially aged in a simulated oral environment (1,200,000 mechanical loads with 50 N; 3,000 thermal cycles with distilled water between 5 degrees C and 55 degrees C; 2 minutes per cycle), fracture resistance and fracture patterns were determined and defect sizes investigated. Results: The fracture force varied between 1,111 N and 2,038 N for conventional cementation and between 1,181 N and 2,295 N for adhesive bonding. No significant differences were found between adhesive and conventional cementations. Fracture patterns presented mostly as a chipping of the veneering, in single cases as a fracture of the core, and in 1 case as a fracture of the tooth. Conclusions: Crown material and cementation do not have any significant influence on the fracture force and fracture performance of all-ceramic and metal-based crowns. Therefore, it may be concluded that adhesive bonding is not necessary for the application of high-strength ceramics. (Quintessence Int 2009; 40: 655-662)
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | FIXED-PARTIAL DENTURES; CERAMIC DENTAL CROWNS; STABILIZED ZIRCONIA; LAYER STRUCTURES; MATERIALS DESIGN; PART II; STRENGTH; FAILURE; STRESS; RESTORATIONS; adhesive bonding; CAD/CAM; cementation; dental crown; fracture; zirconia |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Zahnärztliche Prothetik |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 09 Sep 2020 08:19 |
| Last Modified: | 09 Sep 2020 08:19 |
| URI: | https://pred.uni-regensburg.de/id/eprint/28547 |
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