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Precision of fit of implant‐supported screw‐retained 10‐unit computer‐aided‐designed and computer‐aided‐manufactured frameworks made from zirconium dioxide and titanium: an in vitro study
Author(s) -
Katsoulis Joannis,
MericskeStern Regina,
Rotkina Lolita,
Zbären Christoph,
Enkling Norbert,
Blatz Markus B.
Publication year - 2014
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.12039
Subject(s) - implant , materials science , zirconium dioxide , computer aided , cad , computer aided design , titanium , scanning electron microscope , biomedical engineering , dentistry , computer science , engineering drawing , composite material , medicine , engineering , surgery , metallurgy , programming language , operating system
Objective To analyze the precision of fit of implant‐supported screw‐retained computer‐aided‐designed and computer‐aided‐manufactured ( CAD / CAM ) zirconium dioxide ( Z rO) frameworks. Materials and methods Computer‐aided‐designed and computer‐aided‐manufactured Z rO frameworks ( N obelProcera ™ ) for a screw‐retained 10‐unit implant‐supported reconstruction on six implants ( FDI positions 15, 13, 11, 21, 23, 25) were fabricated using a laser ( Z rO‐ L , N = 6) and a mechanical scanner ( Z rO‐ M , N = 5) for digitizing the implant platform and the cuspid‐supporting framework resin pattern. Laser‐scanned CAD / CAM titanium ( TIT ‐L, N = 6) and cast C o C r W ‐alloy frameworks (Cast, N = 5) fabricated on the same model and designed similar to the Z r O frameworks were the control. The one‐screw test (implant 25 screw‐retained) was applied to assess the vertical microgap between implant and framework platform with a scanning electron microscope. The mean microgap was calculated from approximal and buccal values. Statistical comparison was performed with non‐parametric tests. Results No statistically significant pairwise difference was observed between the relative effects of vertical microgap between Z rO‐ L (median 14 μm; 95% CI 10–26 μm), Z r O ‐ M (18 μm; 12–27 μm) and TIT ‐ L (15 μm; 6–18 μm), whereas the values of Cast (236 μm; 181–301 μm) were significantly higher ( P < 0.001) than the three CAD / CAM groups. A monotonous trend of increasing values from implant 23 to 15 was observed in all groups ( Z r O ‐ L , Z r O ‐ M and C ast P < 0.001, TIT ‐L P = 0.044). Conclusions Optical and tactile scanners with CAD / CAM technology allow for the fabrication of highly accurate long‐span screw‐retained Z r O implant‐reconstructions. Titanium frameworks showed the most consistent precision. Fit of the cast alloy frameworks was clinically inacceptable.