الفهرس 
Limitations of the CAD/CAM technologyOnly 14 pages are availabe for public view
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Abstract
Summary and Conclusion
This in vitro study was performed to evaluate the the effect of
cementation techniques and surface treatments on the retention of hybrid
ceramic cad/ cam endocrowns.
Lower first molar teeth of nearly similar dimensions were selected, the
intact crowns were removed by a horizontal section 1 mm above the CEJ. To
standardize the depth of pulp chamber (3mm) a glass ionomer cement base
was applied to the pulp chamber floor. The standardized depth was verified
using a Digital Depth Micrometer (Mitutoyo, Aurora, IL, USA).
Obturation of the canals was performed to the orifice level. Each tooth
was embedded in a block of self-polymerizing acrylic resin with the long
axis perpendicular to the base of the block and with the acrylic resin ending 2
mm below the cementoenamel junction.
The molars were restored with endocrowns using the Cerec in lab
CAD/CAM system (Sirona Dental Systems, Germany). All restorations were
milled in hybrid ceramic (VITA ENAMIC® for CEREC®/ inLab®, VITA
Zahnfabrik H. Rauter GmbH & Co.KG., Germany).
The anatomy of the occlusal surface and the thickness of their
endocrown restorations was standardized with the aid of Cerec In Lab
software and the biogeneric copy option.
The specimens were classified into four groups according to the
surface treatment of the endocrowns, and cementation technique.