Influence of Abutment Design on Stiffness, Strength, and Failure of Implant‐Supported Monolithic Resin Nano Ceramic (RNC) Crowns. (14th March 2014)

• Record Type: Journal Article
• Authors: Joda, Tim; Huber, Samuel; Bürki, Alexander; Zysset, Philippe; Brägger, Urs
• Is Part Of: Clinical implant dentistry and related research. Volume 17:Number 6(2015:Dec.)
• Page Start: 1200
• Page End: 1207
• Publication Date: 2014-03-14
• Subjects: abutment connection -- dental implants -- DIN ISO 14801 -- failure mode -- resin nano ceramic (RNC) -- stiffness -- strength -- titanium; Dental implants -- Periodicals; Dental Implantation -- Periodicals; Dental Implants -- Periodicals; 617.693
• DOI: 10.1111/cid.12215
• Languages: English
• ISSNs: 1523-0899

Abstract

Abstract: Background: Recent technical development allows the digital manufacturing of monolithic reconstructions with high‐performance materials. For implant‐supported crowns, the fixation requires an abutment design onto which the reconstruction can be bonded. Purpose: The aim of this laboratory investigation was to analyze stiffness, strength, and failure modes of implant‐supported, computer‐assisted design and computer‐aided manufacturing (CAD/CAM)‐generated resin nano ceramic (RNC) crowns bonded to three different titanium abutments. Materials and Methods: Eighteen monolithic RNC crowns were produced and loaded in a universal testing machine under quasi‐static condition according to DIN ISO 14801. With regard to the type of titanium abutment, three groups were defined: (1) prefabricated cementable standard; (2) CAD/CAM‐constructed individualized; and (3) novel prefabricated bonding base. Stiffness and strength were measured and analyzed statistically with Wilcoxon rank sum test. Sections of the specimens were examined microscopically. Results: Stiffness demonstrated high stability for all specimens loaded in the physiological loading range with means and standard deviations of 1, 579 ± 120 N/mm (group A), 1, 733 ± 89 N/mm (group B), and 1, 704 ± 162 N/mm (group C). Mean strength of the novel prefabricated bonding base (group C) was 17% lower than of the two other groups. Plastic deformations were detectable for all implant‐abutment crown connections. Conclusions: Monolithic implant crowns made of RNC seem to represent a feasible and stable prosthetic construction under laboratory testing conditions with strength higher than the average occlusal force, independent of the different abutment designs used in this investigation.