Evaluation of internal fit of interim crown fabricated with CAD/CAM milling and 3D printing system.PURPOSE
 This study is to evaluate the internal fit of the crown manufactured by CAD/CAM milling method and 3D printing method.


 The saved STL file is used on the CAD/CAM milling method and two types of 3D printing method to produce 10 interim crowns per group.  The marginal and internal fit of the interim restoration has more outstanding 3D printing method than the CAD/CAM milling method. 
CAD/CAM
The master model was fabricated with stainless steel by using CNC machine and the work model was created from the vinyl-polysiloxane impression. 
CNC machine
After scanning the working model, the design software is used to design the crown. 
design software
Evaluation of internal fit of interim crown fabricated with CAD/CAM milling and 3D printing system.PURPOSE
 The discrepancy means (standard deviation) of the 3 groups are 171.6 (97.4) µm for the crown manufactured by the milling system and 149.1 (65.9) and 91.1 (36.4) µm, respectively, for the crowns manufactured with the two types of 3D printing system.  There was a statistically significant difference and the 3D printing system group showed more outstanding value than the milling system group.



3D printing system