Abd-Elaziz, M., Mamdouh Salem, R. (2022). IN-VITRO EVALUATION OF MARGINAL ACCURACY AND FRACTURE RESISTANCE OF MANDIBULAR PREMOLAR ENDOCROWNS MADE OF TWO MONOLITHIC CERAMIC MATERIALS.. test, 1(1), 24-38. doi: 10.21608/acdj.2022.265809
Mohamed Abd-Elaziz; Rasmia Mamdouh Salem. "IN-VITRO EVALUATION OF MARGINAL ACCURACY AND FRACTURE RESISTANCE OF MANDIBULAR PREMOLAR ENDOCROWNS MADE OF TWO MONOLITHIC CERAMIC MATERIALS.". test, 1, 1, 2022, 24-38. doi: 10.21608/acdj.2022.265809
Abd-Elaziz, M., Mamdouh Salem, R. (2022). 'IN-VITRO EVALUATION OF MARGINAL ACCURACY AND FRACTURE RESISTANCE OF MANDIBULAR PREMOLAR ENDOCROWNS MADE OF TWO MONOLITHIC CERAMIC MATERIALS.', test, 1(1), pp. 24-38. doi: 10.21608/acdj.2022.265809
Abd-Elaziz, M., Mamdouh Salem, R. IN-VITRO EVALUATION OF MARGINAL ACCURACY AND FRACTURE RESISTANCE OF MANDIBULAR PREMOLAR ENDOCROWNS MADE OF TWO MONOLITHIC CERAMIC MATERIALS.. test, 2022; 1(1): 24-38. doi: 10.21608/acdj.2022.265809

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, Pages 24-38    PDF (467.92 K)
Document Type: Original Article
DOI: 10.21608/acdj.2022.265809
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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