الفهرس 
Restoration of endodontically treated teethOnly 14 pages are availabe for public view
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Abstract
This in-vitro study was performed to evaluate marginal and internal
adaptation of endo-crown restorations processed with variant fabrication
techniques. Thirty freshly extracted human molars were selected. Teeth were
fixed in standardized self-cured cylindrical acrylic blocks and decoronated.
Root canals were endodontically treated and prepared using
Computerized Numerical Control Milling Machine (CNC) for
standardization. Occlusal margin prepared 1mm above the CEJ parallel to
the occlusal plane. Axial preparation made by eliminating all undercuts in
access cavity. Pulpal floor prepared 3mm deep and pulp chamber cavity
trapezoidal in shape to enhance restoration stability. Pulpal orifices and
undercuts in mesial and distal canals protected using resin adhesive system
and cavities covered with flowable composite resin.
Specimens were divided into 2 groups (n=15) according to the
processing technique; heat press and CAD/CAM. Specimens were cemented
with self-etch adhesive resin cement. Evaluation of the marginal adaptation
between the endo-crown and prepared tooth was performed using
stereomicroscope at 40x magnification. Internal adaptation was performed
using CBCT in coronal and sagittal sections.
Marginal and internal adaptation of both techniques were within the
clinical acceptable range, however, CAD/CAM technique showed lower
marginal gap values (53.7 ± 5.5 μm) than heat press technique (63.8 ± 12.1
μm). Also CAD/CAM technique showed lower internal gap values (58.7 ±
7.2 μm) than heat press technique (78.5 ±18.0 μm).