Fracture resistance of implant-supported screw-retained zirconia-based molar restorations

Junichi Honda, Futoshi Komine, Shingo Kamio, Kohei Taguchi, Markus B. Blatz, Hideo Matsumura

Research output: Contribution to journalArticle

6 Scopus citations


Objectives: The objective of this in vitro study was to investigate fracture loads of screw-retained zirconia-based molar restorations (hybrid abutment crown) fabricated with different restorative materials and designs. Material and methods: Forty-four screw-retained zirconia-based molar restorations were fabricated on dental implants and divided into four groups (n = 11): porcelain-layered zirconia-based restorations (PLZ), indirect composite-layered zirconia-based restorations (ILZ), metal-ceramic restorations (MC), and monolithic zirconia restorations (MONO). The zirconia-based restorations in the PLZ, ILZ, and MONO groups were adhesively bonded on implant abutments with a dual-polymerized resin material. All restorations were tightened on implant bodies with titanium screws and were tested for fracture resistance. The Kruskal-Wallis test and Steel-Dwass test were used to evaluate differences in fracture loads (α = 0.05). Results: As compared with the other groups, the MONO specimens had a significantly higher mean fracture resistance (7.54 kN); no significant differences were found among the PLZ (1.96 kN), ILZ (1.80 kN), and MC (1.45 kN) groups (P > 0.05). For the PLZ, ILZ, and MC groups, all specimens fractured within the layering materials. In contrast, the fracture mode for the MONO group was complete fracture of the restorations. Conclusions: All restorations withstood the masticatory forces. Fracture loads were significantly higher for screw-retained implant-supported monolithic zirconia restorations than for screw-retained bilayered restorations. For the screw-retained bilayered zirconia-based restorations, the fracture resistance of ILZ restorations was comparable to that of PLZ restorations and MC restorations.

Original languageEnglish (US)
JournalClinical Oral Implants Research
StateAccepted/In press - 2016
Externally publishedYes


  • Fracture resistance
  • Implant-supported restoration
  • Indirect composite material
  • Screw retained
  • Zirconia framework

ASJC Scopus subject areas

  • Oral Surgery

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  • Cite this

    Honda, J., Komine, F., Kamio, S., Taguchi, K., Blatz, M. B., & Matsumura, H. (Accepted/In press). Fracture resistance of implant-supported screw-retained zirconia-based molar restorations. Clinical Oral Implants Research.