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KMID : 1035320190460020089
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Korean Society for Dental Materials
2019 Volume.46 No. 2 p.89 ~ p.98
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Three-dimensional evaluation of the machinability of monolithic CAD/CAM-generated posterior crowns by nano-hybrid ceramic
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Kim Jae-Hong
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Abstract
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The purpose of this study comparatively analyzed the machinability of various dental hybrid blocks manufactured by usingthe CAD/CAM system. Three hybrid composite blocks (Vita enamic, Lava Ultimate, GC Cerasmart) were used for experimentalgroups and one conventional ceramic block (Vita Mark Ⅱ) was used for control. The digital impression of the master modeland abutment was taken by using a scanner, and then the CAD software program was used to design restorations. The four-axismilling machine (inLab MCXL; Sirona Dental Systems GmbH, Bensheim, Germany) was used four materials. The digitized datawas superimposed with 3D inspection software to quantitatively obtain the machinability of a ceramic crown, and visual differenceswere confirmed with a color map. The root mean square (RMS) values of ceramic crown group were statistically analyzedwith one-way ANOVA (α=0.05). While there was a significant difference in the machinability of the internal surface, amongfour groups, there was statistically significant difference between conventional (VM group) and hybrid ceramic (VE, LU, GCgroups) (p<0.05). Consequently, the machinability of VM is lower than that of other hybrid ceramics, and the machinabilityof VE is better than that of LU and GC. For ceramics as final restorations, manufacturing of dental restorations using hybridcomposite ceramic is recommended.
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KEYWORD
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Dental CAD/CAM system, Hybrid ceramic, Machinability, 3-Dimensional analysis
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