An experimental study on the fit of Co-Cr basal crowns fabricated by different technology
10.3969/j.issn.1001-3733.2016.06.004
- VernacularTitle:不同工艺制作钴铬合金基底冠适合性的实验研究
- Author:
Meikang LI
;
Wenjing SHEN
;
Jie WU
;
Changjun GUO
- Keywords:
Casting technology;
CAD/CAM technology;
Direct metal laser sintering technology;
Co-Cr basal crown;
Marginal fit;
Internal fit
- From:
Journal of Practical Stomatology
2016;32(6):763-766
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To compare the fit of Co-Cr basal crowns fabricated by three kinds of technology. Methods:18 laser cured resin dies were divided into A, B and C groups(n=6) randomly. Co-Cr basal crowns of group A, B and C were made by traditional casting technology, CAD/CAM cutting metal technology and direct metal laser sintering technology( DMLS) respectively. The crowns were cemented to the corresponding dies and the basal crowns and dies were embedded in methyl acrylic. The thickness of the cement layer of the samples was measured under a stero microscope. Data were analyzed with SPSS13. 0 statistical software. Results:Marginal gap of group A, B and C was (66.08 ±3.90) μm, (29.21 ±3.31) μm and (24.96 ±2.99) μm respectively(P<0.01). Internal gap of group A, B and C was (114. 10 ± 27. 66) μm, (73. 69 ± 31. 31) μm and (79. 89 ± 33. 63) μm respectively(A vs B or C, P<0. 01, B vs C, P>0. 05). Conclusion:DMLS technology may make the best marginal fit, CAD/CAM and DMLS technology may pro-duce better internal fit. The marginal fit and the internal fit of the crowns prepared by the 3 methods can meet the clinical requirements.
