Rosentritt, Martin and Sikora, M. and Behr, M. and Handel, G. (2004) In vitro fracture resistance and marginal adaptation of metallic and tooth-coloured post systems. JOURNAL OF ORAL REHABILITATION, 31 (7). pp. 675-681. ISSN 0305-182X,
Full text not available from this repository. (Request a copy)Abstract
The aim of this in vitro study was to compare the fracture resistance and marginal adaptation of all-ceramic incisor crowns with all-ceramic posts, glass-fibre-reinforced posts and titanium posts as well as a control without any post. Three groups of eight maxillary incisors were restored with an all-ceramic post, a fibre-reinforced composite (FRC) post, a titanium post and a further group was restored without posts. Composite cores were provided and all-ceramic crowns were adhesively luted. After artificial ageing, the fracture resistance of the restored teeth was determined. The marginal adaptation of the restorations at the interfaces between cement-tooth and cement-crown was evaluated with scanning electron microscopy using replica specimen before and after ageing. The restored teeth without posts [270N (235/335)] showed no significantly different fracture strength compared with teeth with the titanium system [340N (310/445)]. The all-ceramic posts [580N (425/820)] and the FRC posts [505N (500/610)] both provided a significant higher fracture resistance than the teeth without posts. Prior to ageing, all materials showed <5% separation at the margins cement-tooth or cement-crown ('marginal gap'). After ageing, the interfaces of all systems deteriorated to values between 6 and 14% marginal gap. The greatest marginal gap was found with the titanium system (14%) at the interface cement-crown and with the all-ceramic posts (12%) at the transition between cement-tooth. Regarding fracture resistance and the marginal adaptation, the all-ceramic and FRC posts may be considered as an alternative to the commonly used titanium post restorations.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ENDODONTICALLY TREATED TEETH; STRESS-DISTRIBUTION; SURVIVAL RATE; CORE SYSTEMS; STRENGTH; DESIGN; DENTIN; INCISORS; FATIGUE; CROWNS; fracture resistance; marginal fit; post and core; glassfibre post; ceramic post |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Zahnärztliche Prothetik |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 12 Jul 2021 07:24 |
| Last Modified: | 12 Jul 2021 07:24 |
| URI: | https://pred.uni-regensburg.de/id/eprint/37502 |
Actions (login required)
 |
View Item |
