IN-VITRO EVALUATION OF MARGINAL ACCURACY AND FRACTURE RESISTANCE OF MANDIBULAR PREMOLAR ENDOCROWNS MADE OF TWO MONOLITHIC CERAMIC MATERIALS. | ||||
Ahram Canadian Dental Journal | ||||
Volume 1, Issue 1, October 2022, Page 24-38 PDF (467.92 K) | ||||
DOI: 10.21608/acdj.2022.265809 | ||||
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Authors | ||||
Mohamed Abd-Elaziz* 1; Rasmia Mamdouh Salem2 | ||||
1Professor of fixed prosthodontics, faculty of dentistry, Ahram Canadian university | ||||
2Lecturer of fixed prosthodontics, faculty of dentistry, Ahram Canadian university | ||||
Abstract | ||||
Aim: The purpose of this study was to compare the marginal accuracy and fracture resistance of endodontically treated mandibular premolars restored with endocrowns using two different monolithic CAD/CAM ceramic materials. Materials and Methods: Twenty freshly extracted human mandibular premolars were sectioned coronally and were prepared for endocrown restorations. The teeth samples were randomly assigned two groups (n =10): (LD) lithium disilicate (IPS E-max CAD) and (SH) resin hybrid ceramic (SHOFU Block HC). The CEREC AC system was used to create CAD/CAM endocrown restorations. With dual cured adhesive resin cement, endocrowns were cemented to their corresponding tooth samples. After cementation, marginal gaps were measured using a stereomicroscope, and fracture resistance for each sample was tested using a universal testing machine. Each endocrown sample's mode of failure was assessed. Data was recorded using computer software and statistically evaluated using the student t-test and the Chi square test. Results: There were no statistically significant differences in margin adaptation across the tested groups, although the E-.max CAD (LD) group had a statistically significant higher fracture resistance mean value (1022.83±127.68 N) than the Shofu HC (SH) group (659.50±110.79 N). LD group showed catastrophic fracture, while 50% of SH composite hybrid ceramic samples showed favorable fracture. Conclusions: Even though that LD endocrowns had higher fracture resistance than SH endocrowns, the mode of Shofu HC Hybrid ceramic material was more favorable than LD. | ||||
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