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Two-piece zirconia oral implants withstand masticatory loads: An investigation in the artificial mouth.

Universitätsklinikum

Autoren:
Spies BC, Nold J, Vach K, Kohal R-J
Titel:
Two-piece zirconia oral implants withstand masticatory loads: An investigation in the artificial mouth.
Kurzzitat:
Spies BC, Nold J, Vach K, Kohal R-J: Two-piece zirconia oral implants withstand masticatory loads: An investigation in the artificial mouth. J Mech Behav Biomed, 2016; 53: 1-10. : http://dx.doi.org/10.1016/j.jmbbm.2015.07.005
Publikationstyp:
Originalarbeiten in wissenschaftlichen Fachzeitschriften
Abstract:
Objective To evaluate the fracture resistance of two-piece zirconia oral implants after long-term thermomechanical cycling in an aqueous environment. Non-loaded samples and a one-piece implant system served as control groups. Methods A total of 48 zirconia implants were evaluated: 16 one-piece implants (ATZ; Group A) and 32 differently connected two-piece implants (16 screwed, Group B; 16 bonded, Group C) made of Y-TZP-A (implant+abutment; B) and Y-TZP-A/ATZ (implant/abutment; C), respectively. These groups were divided into two subgroups composed of 8 samples. The samples of subgroups 1 (A1, B1, C1) were not exposed to any cyclic loading, whereas subgroups 2 (A2, B2, C2) were loaded with 10 million cycles (98 N). Subsequently, all 48 implants were statically loaded to fracture. Results A constant load on distinct lever arms resulted in different exerted bending moments during the dynamic loading (A2: 23.4 Ncm, B2: 17.9 Ncm, C2: 32.3 Ncm). All implants survived the long-term thermomechanical cycling. For the static loading the following average bending moments were calculated: A1/A2: 362/399 Ncm; B1/B2: 398/346 Ncm; C1/C2: 380/252 Ncm. Foregoing dynamic loading significantly increased fracture resistance of Group A implants, whereas Group B/C implants showed significantly decreased values. Potentially owed to the experimental setup in an aqueous environment of 60 °C, 5/8 C2 samples showed mobility between implant and abutment due to debonding after dynamic loading conditions. Significance The evaluated ceramic implant systems seem to be able to resist physiological chewing forces long-term. Within the limitations of the experimental setup, the connecting mechanism of Group C implants might be a weak point.
URL
http://dx.doi.org/10.1016/j.jmbbm.2015.07.005
Kontakt:
Institut für Medizinische Biometrie und Statistik

Stefan-Meier-Strasse 26
79104 Freiburg

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Email: sec@imbi.uni-freiburg.de
http://www.imbi.uni-freiburg.de
Forschungsbericht der Abteilung für das Jahr 2016