International Poster Journal of Dentistry and Oral Medicine
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Int Poster J Dent Oral Med 18 (2016), OMD/PDA     15. Jan. 2017
Int Poster J Dent Oral Med 18 (2016), OMD/PDA  (15.01.2017)

Supplement, Poster 1080, Language: English


Wear of the Implant Hexagon with Zirconia and Titanium Abutments
Reis, José A. / Mauricio, Paulo / Reis, Luís / Vaz, Fátima / Barbero, Ignácio
Introduction: In contrast to the high success rates of osseointegration (95% to 97%), mechanical complications are still common in implant dentistry (reported to be as high as 44.9%) Mechanical complications such as screw loosening, screw fracture, and framework fracture.
Objectives: Evaluate the wear of the implant-abutments interface after a torsional fatigue test that simulates a loose abutment situation.
Materials and Methods: 5 external hexagonal implants were embedded with acrylic resin and divided into 3 groups:
- Control group: non engaging titanium abutment
- Group A: two engaging titanium abutments
- Group B: two engaging zirconia abutment
Rotational freedom for each pair was access before and after testing. Each pair was torque to 35Ncm and placed on an Instron 8874 machine and loaded on a rotational test: +/3,3° 4Hz, with a compressive force of 100N for 250.000 cycles.
Results: The screws in all groups were loose after testing. In group A and B there was an increase in the rotational freedom with wear of the hexagon but not on the control. There was evidence of adhesive wear and abrasion in group A and in group B there was adhesive wear, abrasion and 3 body abrasion.
Conclusions: The loose screw in an implant prosthesis may lead to the wear of the hexagon on both parts. The wear is sufficient to compromise the implant-abutment connection beyond repair
Clinical Implication
When a patient presents a loose screw restoration, it should be removed and inspected
Disclosure: MIS Implants Technologies Ltd; FCT IDMEC, LAETA, UID/EMS/50022/2013

Keywords: Wear, implants, abutments

Conference/Exhibition:
25th Annual Meeting of the Portuguese Dental Association
10.-12. December 2016
Exponor, Porto, Portugal