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Stability of screw‐retention in two‐piece zirconia implants: An in vitro study
Author(s) -
Joos Marc,
Sailer Irena,
Filippi Andreas,
Mukaddam Khaled,
Rosentritt Martin,
Kühl Sebastian
Publication year - 2020
Publication title -
clinical oral implants research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.407
H-Index - 161
eISSN - 1600-0501
pISSN - 0905-7161
DOI - 10.1111/clr.13597
Subject(s) - cubic zirconia , titanium , materials science , molar , universal testing machine , implant , dentistry , incisor , orthodontics , composite material , medicine , ultimate tensile strength , ceramic , metallurgy , surgery
Abstract Objectives To compare the stability of a screw‐retained connection in a novel two‐piece zirconia implant to a conventional titanium‐based connection in an in vitro chewing simulation including artificial ageing. Material and methods Incisor (I) and molar (M) shaped monolithic zirconia crowns were screw‐retained on either two‐piece zirconia (test) or two‐piece titanium (control) implants resulting in 4 groups of 8 samples (titanium implants with incisor‐shaped crowns (T‐I), titanium implants with molar‐shaped crowns (T‐M), zirconia implants with incisor‐shaped crowns (Z‐I) and zirconia implants with molar‐shaped crowns (Z‐M). These were subjected to artificial ageing by thermal cycling (TC: 2 × 3000 × 5°C/55°C cycles of 2 min) and mechanical loading (ML: 1.2 × 10 6 cycles of 50 N, f = 1 Hz). Surviving samples additionally underwent a fracture force test. Kaplan–Meier plots were drawn, and two‐way ANOVA was calculated taking anatomical localisation and material variables as factors. Results The mean corresponding survival times were lower for T‐M (0.86 × 10 6 ± 0.31 × 10 6 cycles) and Z‐I (0.84 × 10 6 ± 0.21 × 10 6 cycles) compared to T‐I (1.14 × 10 6 ± 0.10 × 10 6 cycles) and Z‐M (1.20 × 10 6 ± 0.10 × 10 6 cycles). In one‐way ANOVAs for survival time dependent on either location or material, no statistically significant differences could be found (location: p = .31; material: p = .62) in one‐way ANOVAs. The interaction of location and material showed significant differences ( F = 21.3, p < .001). Conclusion The connection of the tested screw‐retained zirconia crowns in two‐piece zirconia implants is comparable to standard titanium implants in the specific in vitro testing.