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Keywords:

  • ceramic abutments;
  • dental implant;
  • fatigue;
  • wall thickness preparation;
  • zirconia

ABSTRACT

Background: Studies about the effect of grinding procedures as well as material thickness on the resistance of zirconia implant abutments are in short supply.

Purpose: This study evaluated the effect of wall thickness as well as preparation on the resistance of zirconia implant abutments.

Materials and Method: Sixty-four implants received titanium (group Ti) and zirconia abutments (groups Zr-8, Zr-18, and Zr-1). The abutments of group Zr-8 had a 0.8-mm wall thickness, whereas the wall thickness of group Zr-18 was reduced by preparation from 1 mm to 0.8 mm. The abutments of group Zr-1 had a wall thickness of 1 mm. Standardized maxillary central incisor metal crowns were cemented on all abutments. All specimens were then tested in a universal testing machine for their resistance to fracture before and after masticatory simulation (n = 8).

Results: The median resistance to fracture values (N) before and after aging were, respectively: group Ti: 500–504; group Zr-8: 487–491; group Zr-18: 490-451; and group Zr-1: 519-480. No significant effects of group, aging, or combinations were found (p > .05).

Conclusion: All tested abutments have the potential to withstand physiologic occlusal forces in the anterior region (>200 N). The applicability of the results to other implant systems should be verified.