[Grinding precision and accuracy of the fit of Cerec-2 CAD/CIM inlays].
The grinding precision of one Cerec-1 (C1) and one Cerec-2 (C2) CAD/CIM unit each was evaluated using standardized inlay-like (mod) samples (n = 40) of Vita Cerec Mk II porcelain and Dicor MGC glass ceramic. Typical dimensions (B, E, F, H) of the sampleS were measured and the standard deviations (SD) analysed statistically using the F-test. SD of C2-machined sample dimensions were significantly lower using both Vita, B: p < 0.05; E: p < 0.001; F: p < 0.001; H: p < 0.001, and Dicor MGC, B: p < 0.05; E: p < 0.001; F: p < 0.001; H: p < 0.01, than those machined with C1, indicating a strong improvement of grinding precision of C2 compared to C1. Accuracy of fit to human molar cavities of mod inlays machined with C1 (n = 6) and C2 (n = 6) was evaluated using a scanning electron microscope with 100x magnification. The width of the interfacial luting gap was generally lower in C2 inlays (56 +/- 27 microns) than with C1 (84 +/- 38 microns). Significant differences (t-test) were seen in margin sections "cervical line angles above CEJ" (C1 = 124 +/- 44/C2 = 59 +/- 30 microns, p < 0.05), "cervical line angles at CEJ" (C1 = 109 +/- 55/C2 = 67 +/- 27 microns, p < 0.05) and "gingival margin above CEJ" (C1 = 81 +/- 32 microns/C2 = 31 +/- 18 microns, p < 0.05).
Schug
J
J
Station für Zahnfarbene und Computer-Restaurationen, Universität Zürich.
Pfeiffer
J
J
Sener
B
B
Mörmann
W H
WH
D002516:Ceramics; D017076:Computer-Aided Design; D003776:Dental Porcelain; D003779:Denture Design / Q000592:standards*; D006801:Humans; D066298:In Vitro Techniques; D007284:Inlays / Q000592:standards*; D008855:Microscopy, Electron, Scanning; D008963:Molar; D011786:Quality Control
C047475:Dicor ceramic; C082340:Vita Mark II; D003776:Dental Porcelain; C074543:Cerec
Schleifpräzision und Passgenauigkeit von Cerec-2-CAD/CIM-Inlays.