Preis, Verena and Behr, Michael and Hahnel, Sebastian and Rosentritt, Martin (2015) Influence of cementation on in vitro performance, marginal adaptation and fracture resistance of CAD/CAM-fabricated ZLS molar crowns. DENTAL MATERIALS, 31 (11). pp. 1363-1369. ISSN 0109-5641, 1879-0097
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Objectives. This study investigated the influence of conventional cementation, self-adhesive cementation, and adhesive bonding on the in vitro performance, fracture resistance, and marginal adaptation of zirconia-reinforced lithium silicate (ZLS) crowns. Methods. Human molar teeth (n =40) were prepared and full-contour crowns of a ZLS ceramic (Celtra Duo, DeguDent,G, n = 32) and a lithium disilicate ceramic (LDS; IPS e.max CAD, Ivoclar-Vivadent, FL, n = 8) were fabricated and glazed. Four groups of ZLS crowns were defined (n = 8/group) and cemented with different glass-ionomer cements, resin, and resin-modified self-adhesive luting materials. The LDS crowns served as reference group with adhesive bonding. A combined thermal cycling and mechanical loading (TCML: 3000 x 5 degrees C/3000 x 55 degrees C; 1.2 x 10(6) cycles a SON) with human antagonists was performed in a chewing simulator. Fracture force of surviving crowns was determined. Marginal adaptation at the cement/tooth and cement/crown interface was investigated by scanning electron microscopy before and after TCML, and the share of perfect margins was determined. Data were statistically analyzed (one-way ANOVA; post hoc Bonferroni, alpha = 0.05). Results. One crown of the adhesive group failed during TCML (879,000 cycles = 3.7 years). No statistically significant (p = 0.078) differences in fracture resistance were found between different cementations, although highest data in tendency were found for adhesive bonding. Shares of perfect margins at the cement/tooth (93.8 +/- 5.6-99.6 +/- 0.8%) and cement/crown (84.7 +/- 6.6-100.0 +/- 0.0%) interfaces did not differ significantly (p >0.05) between the different cementation groups. Significance. Marginal adaptation and fracture forces of all tested groups are in a range, where no restrictions should be expected for clinical application. (C) 2015 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ALL-CERAMIC CROWNS; LITHIUM-DISILICATE CROWNS; FIXED-PARTIAL DENTURES; CLINICAL-EVALUATION; LABORATORY SIMULATION; LUTING AGENTS; SYSTEMS; MICROLEAKAGE; RESIN; FATIGUE; Cementation; Crown; Ceramics; Zirconia-reinforced lithium silicate; Marginal adaptation; Fracture resistance |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Zahnärztliche Prothetik |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 07 May 2019 11:43 |
| Last Modified: | 07 May 2019 11:43 |
| URI: | https://pred.uni-regensburg.de/id/eprint/4506 |
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