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KMID : 0362120170390040235
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Journal of Technologic Dentistry
2017 Volume.39 No. 4 p.235 ~ p.242
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Effect of cement space on the marginal and internal fit of zirconia restorations fabricated by CAD/CAM system
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Lee Jung-Hwan
Ahn Jae-Seok
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Abstract
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Purpose: The aim of this study was to evaluate the marginal and internal gap of zirconia copings fabricated by CAD/CAM system and to research the effect of cement space on the fit of zirconia prosthesis.
Methods: Zirconia copings were designed using 3shape software and then milled from presintered zirconia blocks by Kavo dental milling machine. The cement space was set at 0 ㎛ around the margins for all groups, and additional cement space appling 1 mm above the finish lines of tooth. The samples were classified into 4 groups according to the cement space setting(Cs-0, Cs-40, Cs-80, Cs-120). Replica technique used to investigate marginal and internal gap. The silicone film thickness was recorded using a optical microscope with image software analysis system at 75×magnification. The assessment performed on the six points in bucco-lingual and mesio-distal sections(4 groups, 10 copings per group, 12 measuring points per coping). The data were statistically analyzed with one-way ANOVA followed by pair-wise Tukey’s post hoc tests(α<0.05).
Results: Better marginal and internal fit values were exhibited by 80 ㎛ cement space. The results showed that different cement space values had statistically significant effect on the marginal and internal gap of zirconia copings(p<0.001). The gap of margin and axial wall area was smaller than that the gap of occlusal area in all groups(p<0.001).
Conclusion : Effect of different cement spaces on the marginal and internal gap of zirconia copings.
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KEYWORD
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CAD/CAM, Cement space, Marginal and internal fit, Zirconia coping
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