Behr, Michael and Rosentritt, Martin and Sikora, MI and Karl, P. and Handel, Gerhard (2003) Marginal adaptation and fracture resistance of adhesively luted glass fibre-composite reinforced molar crowns with different inner crown surfaces. JOURNAL OF DENTISTRY, 31 (7). pp. 503-508. ISSN 0300-5712
Full text not available from this repository.Abstract
Objectives. This study compared the influence of different inner crown surfaces on the fracture resistance and marginal. adaptation of adhesively fixed glass fibre-reinforced molar crowns. Material and methods. Vectris/Targis crowns were constructed with an inner framework of glass fibres (directly on the tooth) or an inner veneering composite layer between the fibre-framework and the tooth-substance. Both groups were sandblasted inside using Al2O3; 50 mum grain size (200 kPa, 20 s) and silane coated. A control group had the inner fibre framework, but was neither sandblasted nor silane coated. The crowns were adhesively cemented on extracted human teeth, and thermally cycled and mechanically loaded (TCML: 6000 x 5 degreesC/55 degreesC; 1.2 x 10(6) x 50 N, 1.66 Hz). The marginal adaptation before and after TCML was evaluated and the fracture resistance was investigated using a Zwick universal testing machine. Results. After TCML the proportion of 'perfect margin' of the control group decreased significantly at the interface crown/cement. For the variations with an inner fibre framework or inner composite layer the marginal adaptation or fracture resistance did not decrease significantly after ageing. The fracture resistance values were control: 1509N +/- 486; inner fibre framework: 1896N +/- 342; inner composite layer: 1754N +/- 340. Conclusions. In the case of the investigated fibre framework and veneering-reinforced molar crowns can be covered composite, the inner surface of glass fibre with a composite layer or with a glass fibre framework. Both methods achieve comparable high fracture strengths and reliable marginal adaptation. (C) 2003 Elsevier Ltd. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | BOND STRENGTH; RESINS; fibre-reinforced composite; crowns; cementation; marginal adaptation; fracture load |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Zahnärztliche Prothetik |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 30 Aug 2021 10:12 |
| Last Modified: | 30 Aug 2021 10:12 |
| URI: | https://pred.uni-regensburg.de/id/eprint/38666 |
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