Resistance to fracture in fixed dental prostheses over cemented and screw-retained implant-supported zirconia cantilevers in the anterior region

• Verfasst von: Rues, Stefan [VerfasserIn]
• Verfasst von: Kappel, Stefanie [VerfasserIn]
• Verfasst von: Ruckes, Dorothee [VerfasserIn]
• Verfasst von: Rammelsberg, Peter [VerfasserIn]
• Verfasst von: Zenthöfer, Andreas [VerfasserIn]
• Titel: Resistance to fracture in fixed dental prostheses over cemented and screw-retained implant-supported zirconia cantilevers in the anterior region
• Titelzusatz: an in vitro study
• Verf.angabe: Stefan Rues, Stefanie Kappel, Dorothee Ruckes, Peter Rammelsberg, Andreas Zenthöfer
• E-Jahr: 2020
• Jahr: May/June 2020
• Umfang: 9 S.
• Fussnoten: Gesehen am 04.06.2020
• Titel Quelle: Enthalten in: The international journal of oral & maxillofacial implants
• Ort Quelle: Carol Stream, Ill. : Quintessence Publ. Co., 1986
• Jahr Quelle: 2020
• Band/Heft Quelle: 35(2020), 3, Seite 521-529
• ISSN Quelle: 1942-4434
• DOI: doi:10.11607/jomi.7899
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1699761701

Abstract

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_u,total) occurred within the implant components, the adhesive base was replaced by a cast CoCr base, and the - cFDP’s fracture resistance (F_u,cFDP) was also determined. Using statistical analyses (SPSS 24, IBM), factors affecting fracture - resistance were identified. Results: F_u,total was mainly correlated to screw fractures and therefore not affected by cFDP - design. Oblique loading on the pontic (F_u,total = 231 N - 352 N), however, led to a significant (P < .001) decrease in ultimate - load compared with axial loading on the pontic (F_u,total = 611 N - 815 N). In relation to F_u,total, F_u,cFDP 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.