Chulalongkorn University Dental Journal

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To compare fracture resistance of endodontically treated maxillary premolars restored with ceramic restorations using three retentive techniques. Forty maxillary premolars were randomly selected as a control (Group 1), composite core/crown (Group 2), fiber-reinforced composite post/ composite core/crown (Group 3) and endocrown (Group 4). All restorations were thermo-cycled and subjected to vertical loading. Fracture load and fracture modes were analyzed. The results showed that Group 3 recorded a significantly highest fracture load (2304 ± 737 N). Pairwise comparisons showed no significant difference between Group 2 (1229 ± 303 N) and group 4 (1609 ± 395 N). Type of coronal-radicular retention was significantly associated with fracture mode (p = 0.002). All fractures in Group 4 were non-restorable. After adjusting for fracture load (limited to Groups 1-3), logistic regression displayed no significant differences in fracture mode between Groups 1, 2 and 3. In conclusion, the all-ceramic crowns presented the highest fracture strength when fiber-reinforced composite posts and composite cores were included in the restoration of endodontically treated maxillary premolar. (CU Dent J. 2019;42:65-76)



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