ABSTRACT: 2317

Biomechanical properties of custom made zirconium dioxide implant abutments

J.I. HJERPPE¹, T. RAKKOLAINEN², L.V. LASSILA³, T.O. NÄRHI³, and P.K. VALLITTU³, ¹University of Turku, Helsinki, Finland, ²Dental Laboratory Turun Teknohammas Oy, Turku, Finland, ³University of Turku, Finland

Abstract:

Biomechanical properties of custom made zirconium dioxide implant abutments

J. Hjerppe, T. Rakkolainen, L. Lassila, T. Närhi and P.K. Vallittu

University of Turku, Department of Prosthetic Dentistry & Biomaterials Science, Institute of Dentistry, Turku Finland.

Objectives: Zirconium dioxide implant abutments provide better esthetical properties than metal abutments. The aim of this study was to evaluate mechanical properties of custom made zirconium dioxide abutments, compared to standard zirconium dioxide abutments. Methods: Partially yttrium stabilised zirconium dioxide (ICE Zircon, ZirkonZahn, Italy) blocks were ground to abutments and divided into four groups (n=7/group). The abutments were sintered at 1500 °C in the sintering oven (ZirkonZahn). Standard abutments were used as control (groups 1 and 4, n=7/group). Abutments in the study groups were: 1)Astra, 2)ZirkonZahn-Astra, 3)ZirkonZahn-Astra-short, 4)Xive, 5)ZirkonZahn-Xive, 6)ZirkonZahn-Xive-modified. The abutments were screwed on implant replicas (size 3.5/4.0) to PMMA-sample bases and they were loaded with universal testing machine (LRX, Lloyd Ltd, UK) at room temperature. Testing angle was 45° and the abutments were loaded at the upper end of the sample until the final failure occurred. Also initial failure load and fracture mode of the abutments was evaluated. Statistical analyses were made using ANOVA. Results: Oneway-ANOVA-analysis revealed significant differences between the groups (p<0.05). Xive-model represented catastrophic failure where as Astra-design revealed visually bending before to failure. Results were:

Abutment type (Group)

Initial failure load N (SD)

Stat.diff.

Final failure load N (SD)

Stat.diff.

Astra (1)

534 (137)

a

606 (113)

a

ZirkonZahn-Astra (2)

461 (180)

a

511 (156)

a

ZirkonZahn-Astra-Short (3)

523 (162)

a

624 (103)

a

Xive (4)

369 (31)

a

412 (79)

a

ZirkonZahn-Xive (5)

412 (111)

a

412 (111)

a

ZirkonZahn-Xive-modified (6)

1092 (212)

b

1099 (207)

b

Conclusions: Custom made zirconium dioxide abutments showed comparable failure loads to the standard zirconium dioxide abutments.

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