Phase transformation and fracture load of stock and CAD/CAM-customized zirconia abutments after 1 year of clinical function

Ulf Schepke*, Marco M M Gresnigt, Wesley R Browne, Shaghayegh Abdolahzadeh, Joey Nijkamp, Marco S Cune

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

3 Citations (Scopus)
219 Downloads (Pure)

Abstract

Objectives Functional loading and low-temperature degradation may give rise to impaired clinical long-term service of zirconia implant abutments. The aim of this study was to compare the fracture strength (primary outcome measure) and the volume percentage of monoclinic surface zirconia (m-ZrO2) of stock and CAD/CAM-customized zirconia implant abutments that functioned clinically for 1 year with geometrically identical pristine controls in an ex vivo experiment. Material and methods Twenty-three stock (ZirDesign (TM)) and 23 CAD/CAM-customized (Atlantis (TM)) zirconia implant abutments were retrieved after 1 year of clinical service. They were compared with pristine copies with respect to the volume fraction of the monoclinic phase using Raman spectroscopy and their fracture load by means of a single load-to-fracture test. Failure analysis was performed using optical and SEM microscopy. After verification of normal distribution, paired t tests were used for comparison of fracture loads between pristine and clinically aged specimen. All statistical tests employed a level of significance of alpha = 0.05. Results The fracture loads of the stock zirconia abutments were significantly (p <0.05) reduced to 78.8% (SD 29.5%) after one year of clinical function. For the CAD/CAM abutments, no reduction in fracture load was found. No m-ZrO2 volume percentages beyond the detection threshold of 5% were observed in any of the samples. Conclusions After 1 year of clinical service, no difference in fracture strength of the CAD/CAM-customized zirconia implant abutments could be demonstrated, whereas the stock zirconia abutments decreased considerably in fracture strength. No substantial tetragonal-to-monoclinic transformation was observed.

Original languageEnglish
Pages (from-to)559-569
Number of pages11
JournalCLINICAL ORAL IMPLANTS RESEARCH
Volume30
Issue number6
Early online date22-Apr-2019
DOIs
Publication statusPublished - Jun-2019

Keywords

  • biomaterials
  • clinical research
  • clinical trials
  • material sciences
  • prosthodontics
  • surface chemistry
  • TITANIUM IMPLANT ABUTMENTS
  • ALL-CERAMIC CROWNS
  • IN-VITRO
  • BENDING MOMENTS
  • DIFFERENT ANGULATIONS
  • INTERNAL CONNECTION
  • FAILURE MODES
  • RESISTANCE
  • STRENGTH
  • RESTORATIONS

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