الفهرس | Only 14 pages are availabe for public view |
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). |