FRACTURE RESISTANCE OF ENDODONTICALLY TREATED PREMOLARS RESTORED with ENDOCROWNS WITH DIFFERENT PREPARATION DEPTH. IN VITRO STUDY. | ||||
| Egyptian Dental Journal | ||||
| Article 25, Volume 67, Issue 3 - Serial Number 4, July 2021, Page 2465-2474 PDF (1.32 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/edj.2021.72315.1588 | ||||
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| Author | ||||
Amira Elsharkawy 
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| Associate Professor, Fixed Prosthodontics, Faculty of Dentistry, 6th of October University, Giza, Egypt | ||||
| Abstract | ||||
| Purpose: The aim of the study was to assess the effect of different endocrown extensions inside the pulp chamber on the fracture resistance and failure mode of maxillary premolars. Materials and methods: Twenty four single rooted upper premolars were root canal treated, randomly divided into three main groups (n=8) according to extensions of endocrowns inside the pulp chamber (GI= 2mm , GII= 3mm and GIII= 4 mm) . Endocrowns were made-up from Brillient Crios (BC) CAD/CAM blocks and cemented with adhesive resin cement. Teeth were subjected to thermo-cycling and then to 45º oblique compressive load until fracture. The fracture resistance and failure modes were determined. Data were analyzed with One Way ANOVA followed by Tukey`s post hoc test for multiple comparisons. Results: The fracture resistances were significantly different between all groups; GII scored the highest mean fracture resistance value (647±72.37 N) followed by GI (475.6±69.92 N), and the lowest was scored by GIII (353.9±61.02 N). Regarding fracture analysis of different preparation depths; Gr I showed highest repairability percentage followed be Gr II and Gr III; there was significant difference between Gr (I) and Gr (II) and between Gr (I) and Gr (III) as P-value < 0.05. While, there was insignificant difference between Gr (II) and Gr (III) as P-value > 0.05 as revealed by Chi Square test. Conclusion: Different extensions of endocrowns inside the pulp chamber affect the fracture resistance and failure mode of maxillary premolars. | ||||
| Keywords | ||||
| PREMOLARS ENDOCROWNS; fracture resistance; preparation depth | ||||
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