Rosentritt, Martin and Plein, Tobias and Kolbeck, Carola and Behr, Michael and Handel, Gerhard (2000) In vitro fracture force and marginal adaptation of ceramic crowns fixed on natural and artificial teeth. INTERNATIONAL JOURNAL OF PROSTHODONTICS, 13 (5). pp. 387-391. ISSN 0893-2174
Full text not available from this repository. (Request a copy)Abstract
Purpose: Artificial teeth made of acrylic resin or alloy are considered substitutes for rare caries-free human teeth in in vitro examinations. The purpose of this study was to compare the fracture strength and marginal adaptation of all-ceramic single crowns fixed to natural teeth with crowns fixed to artificial teeth after artificial aging. Materials and Methods: The fracture force and marginal adaptation were investigated in 28 adhesively luted all-ceramic crowns on human molars of different sizes, as well as on alloy and liquid crystal polymer (LCP) artificial teeth. The fracture force was determined using a universal testing machine, and the semiquantitative marginal adaptation was examined using a scanning electron microscope, in both instances after simulating 5 years of clinical service. Results: Fracture force was found to be significantly higher for crowns fixed on substitute materials (alloy = 1,838 N; LCP = 1,392 N) than for crowns on human teeth (888 N). No significant differences in marginal quality could be determined between the groups. All crowns showed marginal gaps of about 10% and perfect margins at about 90%. Conclusion: The high in vitro fracture values of all-ceramic crowns on artificial materials may lead to a misinterpretation of the tested restorative materials, overvaluing the material properties in a first preclinical estimation. Human teeth or materials with a comparable modulus of elasticity are therefore preferred in in vitro fracture tests.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ; |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Zahnärztliche Prothetik |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 28 Mar 2022 06:59 |
| Last Modified: | 28 Mar 2022 06:59 |
| URI: | https://pred.uni-regensburg.de/id/eprint/42237 |
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