Marginal gap and internal fit of 3D printed versus milled monolithic zirconia crowns

被引:27
作者
Refaie, Ashraf [1 ,2 ,3 ]
Fouda, Ahmed [1 ]
Bourauel, Christoph [1 ]
Singer, Lamia [1 ,4 ]
机构
[1] Univ Hosp Bonn, Oral Med Technol, Bonn, Germany
[2] Fayoum Univ, Fac Dent, Dept Fixed Prosthodont, Faiyum, Egypt
[3] British Univ Egypt, Fac Oral & Dent Med, Cairo, Egypt
[4] Univ Hosp Bonn, Dept Orthodont, Bonn, Germany
关键词
Yttria-stabilized zirconia crowns; 3D printing; Subtractive manufacturing; Marginal gap; Internal fit; CAD-CAM; ADAPTATION; DISCREPANCIES; ACCURACY; COPINGS;
D O I
10.1186/s12903-023-03184-8
中图分类号
R78 [口腔科学];
学科分类号
1003 ;
摘要
BackgroundThis study aimed to evaluate and compare the marginal gap using two different methods and the internal fit of 3D printed and zirconia crowns.Methods3Y-TZP zirconia crowns (n = 20) were manufactured using subtractive milling (group M) and 3D printed (group P). The marginal gap was measured at 60 points using vertical marginal gap technique (VMGT). On the other hand, the silicone replica technique (SRT) was used to evaluate the internal fit and was divided into 4 groups: marginal gap, cervical gap, axial gap, and occlusal gap where the thickness of light impression was measured at 16 references. The numerical data was tested for normality using Shapiro-Wilk's test. They were found to be normally distributed and were analyzed using an independent t-test.ResultsUsing VMGT, group P had significantly higher mean marginal gap values of 80 & PLUSMN; 30 & mu;m compared to group M = 60 & PLUSMN; 20 & mu;m (p < 0.001). Also, with the SRT, the marginal gap of group P (100 & PLUSMN; 10 & mu;m) had significantly higher values compared to group M (60 & PLUSMN; 10 & mu;m). The internal fit showed significant difference between the tested groups except for Axial Gap.ConclusionsAlthough milled crowns showed better results. The 3D printed zirconia crowns offer clinically acceptable results in terms of marginal adaptation and internal fit. Both VMGT and SRT are reliable methods for the assessment of the marginal gap.
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页数:7
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