Retentive force of telescopic crowns combining fiber-reinforced composite and zirconia
Purpose: This study investigated changes in the retentive force of telescopic crowns fabricated by combining a zirconia primary crown and a fiber-reinforced composite (FRC) secondary crown.Methods: Primary zirconia crowns were produced with a nominal convergence angle of 0°. Forty-eight secondary cr...
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| Hauptverfasser: | , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
[2022]
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| In: |
Journal of prosthodontic research
Year: 2022, Jahrgang: 66, Heft: 2, Pages: 265-271 |
| ISSN: | 1883-1958 |
| DOI: | 10.2186/jpr.JPR_D_20_00163 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.2186/jpr.JPR_D_20_00163
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| Verfasserangaben: | Akinori Tasaka, Franz Sebastian Schwindling, Stefan Rues, Peter Rammelsberg, Shuichiro Yamashita |
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| 100 | 1 | |a Tasaka, Akinori |e VerfasserIn |0 (DE-588)1276164386 |0 (DE-627)1828120049 |4 aut | |
| 245 | 1 | 0 | |a Retentive force of telescopic crowns combining fiber-reinforced composite and zirconia |c Akinori Tasaka, Franz Sebastian Schwindling, Stefan Rues, Peter Rammelsberg, Shuichiro Yamashita |
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| 520 | |a Purpose: This study investigated changes in the retentive force of telescopic crowns fabricated by combining a zirconia primary crown and a fiber-reinforced composite (FRC) secondary crown.Methods: Primary zirconia crowns were produced with a nominal convergence angle of 0°. Forty-eight secondary crowns were milled from FRC and divided into three study groups (n=16/group) based on milling parameters and post-milling adjustment. The offset parameter used for the final milling step of the inner crown surface was adjusted for a tight initial fit in Group 1 (milling offset: +10 µm, i.e., 2 × 10 µm = 20 µm lower inner diameter compared with the CAD file of the crown) and for improved initial fit (milling offset: -10 µm, i.e., an enlargement of the inner crown diameter by 2 × 20 µm = 40 µm in relation to Group 1) in Groups 2 and 3. The inner surfaces of the secondary crowns were polished with diamond paste in Groups 1 and 2, and silicon points were used for Group 3. The retentive force was measured using a universal testing device. The secondary crown was placed on the primary crown, with the final fitting force set to a load of 100 N. This test was conducted before and after aging (10,000 insertion/removal cycles) under dry and wet conditions. A generalized linear model was used to estimate the differences in the retentive force to elucidate the effects of the milling parameters and polishing methods.Results: We realized an initial retentive force of approximately 10 N. In Groups 2 and 3, the difference was statistically significant between the dry and wet conditions before aging (P < 0.05). There was no significant difference between the dry and wet conditions after aging in any of the groups (P > 0.05).Conclusion: An adequate initial retentive force can be achieved with telescopic crowns combining zirconia and FRC. | ||
| 650 | 4 | |a CAD/CAM | |
| 650 | 4 | |a Fiber-reinforced composite | |
| 650 | 4 | |a Removable partial denture | |
| 650 | 4 | |a Retention | |
| 650 | 4 | |a Telescopic crown | |
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| 700 | 1 | |a Rammelsberg, Peter |d 1959- |e VerfasserIn |0 (DE-588)122469836 |0 (DE-627)705920836 |0 (DE-576)293285640 |4 aut | |
| 700 | 1 | |a Yamashita, Shuichiro |e VerfasserIn |4 aut | |
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