Skouridou, Nikoleta and Pollington, Sarah and Rosentritt, Martin and Tsitrou, Effrosyni (2013) Fracture strength of minimally prepared all-ceramic CEREC crowns after simulating 5 years of service. DENTAL MATERIALS, 29 (6). E70-E77. ISSN 0109-5641, 1879-0097
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Objectives. To examine the strength and mode of fracture of traditionally and minimally prepared all-ceramic resin bonded CAD/CAM crowns after fatigue loading. Methods. Thirty human maxillary molars were used and divided in three groups namely; traditional crown preparation group (I), minimal crown preparation group (II) and occlusal veneer preparation group (III). A leucite reinforced glass ceramic (IPS Empress CAD) was used for fabricating the crowns. The CEREC InEOS system (v3.10) was used for scanning, designing and milling. Five years of clinical service were simulated and the fracture strength of the crowns was measured. One-way ANOVA and Kruskal-Wallis test were used for data analysis (alpha = 0.05). Results. The mean fracture strength and SD in Group I was 1070 N (+/- 181) and in Group II 1110 N (+/- 222). One-way ANOVA analysis showed no statistically significant difference between the two groups (p > 0.05). In Group III all restorations developed cracks during TCML and were not subjected to fracture loading. Three of the traditionally designed crowns (Group I) and 4 of the minimally designed crowns (Group II) developed surface cracks during TCML. Significance. Minimal all-ceramic resin-bonded crowns can potentially form a viable restorative option as they demonstrated comparable strength to traditional all-ceramic crowns. However, this should be interpreted with caution as a number of crowns showed cracks after 5 years of simulated service. All the occlusal veneers developed cracks during simulation and further investigation is needed for this to be considered a viable option. (C) 2013 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CAD/CAM COMPOSITE RESIN; FIXED PARTIAL DENTURES; IN-VITRO; LABORATORY SIMULATION; MARGINAL ADAPTATION; OCCLUSAL VENEERS; RESISTANCE; SYSTEMS; FAILURE; FORCE; CEREC; All-ceramic crowns; Minimal; Artificial aging; Fracture strength |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Zahnärztliche Prothetik |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 08 Apr 2020 09:30 |
| Last Modified: | 08 Apr 2020 09:30 |
| URI: | https://pred.uni-regensburg.de/id/eprint/16603 |
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