Stability of Cantilever Fixed Dental Prostheses on Zirconia Implants

The objective was to determine the optimal connector size and position within zirconia disks for implant-supported cantilever fixed dental prostheses (ICFDP). Two-unit ICFDPs ( = 60) were designed for the premolar region with connector sizes of either 9 or 12 mm and positioned in the enamel or denti...

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Published inMaterials Vol. 15; no. 10; p. 3633
Main Authors Rohr, Nadja, Nüesch, Reto, Greune, Rebecca, Mainetti, Gino, Karlin, Sabrina, Zaugg, Lucia K, Zitzmann, Nicola U
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 19.05.2022
MDPI
Subjects
biaxial flexural strength
cantilever
chewing simulation
Composite materials
Dental implants
Dentin
Disks
Enamel
Epoxy resins
FDP
Flexural strength
fracture load
Fractures
Load
Prostheses
Scanning electron microscopy
Simulation
Surgical implants
Titanium
zirconia implant
Zirconium alloys
Zirconium dioxide
Netherlands
United States > US
Switzerland
Japan
Germany
chewing simulation
cantilever
FDP
fracture load
zirconia implant
biaxial flexural strength
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Summary:The objective was to determine the optimal connector size and position within zirconia disks for implant-supported cantilever fixed dental prostheses (ICFDP). Two-unit ICFDPs ( = 60) were designed for the premolar region with connector sizes of either 9 or 12 mm and positioned in the enamel or dentin layer of two different types of zirconia disks. The restorations were milled and cemented onto zirconia implants. After simulated chewing for 1.2 Mio cycles, the fracture load was measured and fractures were analyzed. No fractures of ICFDPs or along the implants were detected after simulated aging. The mean fracture load values were significantly higher for a connector size of 9 mm (951 N) compared with 12 mm (638 N). For the zirconia material with a higher biaxial flexural strength, the fracture load values were increased from 751 to 838 N, but more implant fractures occurred. The position within the zirconia disk did not influence the fracture load. A connector size of 9 mm and a zirconia material with a lower strength should be considered when designing ICFDPS on zirconia implants to reduce the risk of fractures along the intraosseous implant portion.
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These authors contributed equally to this work.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma15103633