Effect Of Two Milling CAD CAM Machines On The Marginal Accuracy Of Two All Ceramic Crown Materials
Basma Refaat Mohamed Fayyad;
Abstract
The present study aims of this study is to compare the effect of two milling machines the Cerec 5-axis Mcx5 with the Cerec 4-axis Mcxl, on the marginal adaptation of two all ceramic crowns using two different materials the IPS Emax and Zirconia.
Acrylic lower second molars were selected and prepared using straight hand piece mounted on surveyor, tapered stone with rounded end was used to produce 1mm finish line and axial walls with 10 degree taper.
Twenty eight full contour crowns were designed on the scanned abutments, using inLab 3D software (V4.2.5), and then were milled using translucent zirconia blocks and lithium disilicate blocks, 5 crowns of each material for every occlusal preparation design .
The translucent zirconia crowns were milled with an oversize of approximately 25% to compensate for the later sintering shrinkage. The crowns were sintered in high temperature furnace to have maximum density. While the lithium disilicate crowns were adjusted in the pre-crystallized state and then were glazed and crystallized.
The crowns were then seated and cemented. All crowns in all groups were cemented with resin cement. During cementation static finger pressure was applied then the specimens were axially loaded with a 5kg load using a specially designed device.
Acrylic lower second molars were selected and prepared using straight hand piece mounted on surveyor, tapered stone with rounded end was used to produce 1mm finish line and axial walls with 10 degree taper.
Twenty eight full contour crowns were designed on the scanned abutments, using inLab 3D software (V4.2.5), and then were milled using translucent zirconia blocks and lithium disilicate blocks, 5 crowns of each material for every occlusal preparation design .
The translucent zirconia crowns were milled with an oversize of approximately 25% to compensate for the later sintering shrinkage. The crowns were sintered in high temperature furnace to have maximum density. While the lithium disilicate crowns were adjusted in the pre-crystallized state and then were glazed and crystallized.
The crowns were then seated and cemented. All crowns in all groups were cemented with resin cement. During cementation static finger pressure was applied then the specimens were axially loaded with a 5kg load using a specially designed device.
Other data
| Title | Effect Of Two Milling CAD CAM Machines On The Marginal Accuracy Of Two All Ceramic Crown Materials | Other Titles | تأثير ماكينتان خرط الكاد كام علي التكيف الحافي علي مادتين تيجان خزفية | Authors | Basma Refaat Mohamed Fayyad | Issue Date | 2017 |
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