Resistance to fracture in fixed dental prostheses over cemented and screw-retained implant-supported zirconia cantilevers in the anterior region: an in vitro study
Stefan Rues, MSc/Stefanie Kappel, PhD, DDS/Dorothee Ruckes, BSc/Peter Rammelsberg, PhD, DDS/Andreas Zenthöfer, PhD, DDS: Purpose: To evaluate the resistance to fracture in cantilevered fixed dental prostheses (cFDPs) of single implant-supported - zirconia cantilevers in the anterior region. Materi...
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| Main Authors: | , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
May/June 2020
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| In: |
The international journal of oral & maxillofacial implants
Year: 2020, Volume: 35, Issue: 3, Pages: 521-529 |
| ISSN: | 1942-4434 |
| DOI: | 10.11607/jomi.7899 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: http://www.quintpub.com/journals/omi/abstract.php?iss2_id=1680&article_id=20282#.XtiXN8BCQ2w Verlag: https://doi.org/10.11607/jomi.7899 
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| Author Notes: | Stefan Rues, Stefanie Kappel, Dorothee Ruckes, Peter Rammelsberg, Andreas Zenthöfer |
| Summary: | Stefan Rues, MSc/Stefanie Kappel, PhD, DDS/Dorothee Ruckes, BSc/Peter Rammelsberg, PhD, DDS/Andreas Zenthöfer, PhD, DDS: Purpose: To evaluate the resistance to fracture in cantilevered fixed dental prostheses (cFDPs) of single implant-supported - zirconia cantilevers in the anterior region. Materials and Methods: Thirty-two cemented and solely screw-retained cFDPs - consisting of an implant-supported crown replacing the central incisor and an attached cantilever unit in the position - of the lateral incisor in the maxilla were constructed by computer-aided design (CAD) and machined by computer-aided - manufacturing (CAM). For the cemented solution, a cFDP was designed on top of a customized abutment luted - to an adhesive base. For screw-retained cFDPs, abutment, cement gap, and restoration of the cementable design - were combined. All cFDPs were veneered manually on the facial side. Half of the samples underwent artificial aging - (thermocycling and chewing simulation) before fracture tests were conducted with loads applied to the pontic either - parallel to the implant axis (axial loading on the pontic) or tilted lingually by α = 45 degrees (oblique loading on the - pontic). Thus, there were eight groups differing in cFDP design, artificial aging, and load application (n = 8/group). If - fracture (F<sub>u,total</sub>) occurred within the implant components, the adhesive base was replaced by a cast CoCr base, and the - cFDP’s fracture resistance (F<sub>u,cFDP</sub>) was also determined. Using statistical analyses (SPSS 24, IBM), factors affecting fracture - resistance were identified. Results: F<sub>u,total</sub> was mainly correlated to screw fractures and therefore not affected by cFDP - design. Oblique loading on the pontic (F<sub>u,total</sub> = 231 N - 352 N), however, led to a significant (P < .001) decrease in ultimate - load compared with axial loading on the pontic (F<sub>u,total</sub> = 611 N - 815 N). In relation to F<sub>u,total</sub>, F<sub>u,cFDP</sub> was approximately - twice as high for both loading conditions. Conclusion: When relating the results to maximum occlusal forces exerted - in the maxillary anterior region, single implant-supported cFDPs can be a viable restorative treatment option. |
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| Item Description: | Gesehen am 04.06.2020 |
| Physical Description: | Online Resource |
| ISSN: | 1942-4434 |
| DOI: | 10.11607/jomi.7899 |