Influence of material type and preparation depth on the fracture resistance of endocrown restoration
EL-hosary, A., Al-Zordk, W., abdelkader, A., Ghazy, M. (2022). Influence of material type and preparation depth on the fracture resistance of endocrown restoration. EKB Journal Management System, 68(1), 597-605. doi: 10.21608/edj.2021.92662.1770
Abdallah Mohamed EL-hosary; Walid Al-Zordk; abdelreheem abdelkader; Mohamed Ghazy. "Influence of material type and preparation depth on the fracture resistance of endocrown restoration". EKB Journal Management System, 68, 1, 2022, 597-605. doi: 10.21608/edj.2021.92662.1770
EL-hosary, A., Al-Zordk, W., abdelkader, A., Ghazy, M. (2022). 'Influence of material type and preparation depth on the fracture resistance of endocrown restoration', EKB Journal Management System, 68(1), pp. 597-605. doi: 10.21608/edj.2021.92662.1770
EL-hosary, A., Al-Zordk, W., abdelkader, A., Ghazy, M. Influence of material type and preparation depth on the fracture resistance of endocrown restoration. EKB Journal Management System, 2022; 68(1): 597-605. doi: 10.21608/edj.2021.92662.1770

Influence of material type and preparation depth on the fracture resistance of endocrown restoration

Egyptian Dental Journal
Article 3, Volume 68, Issue 1 - Serial Number 4, January 2022, Page 597-605  XML PDF (935.95 K)
Document Type: Original Article
DOI: 10.21608/edj.2021.92662.1770
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Authors
Abdallah Mohamed EL-hosary email 1; Walid Al-Zordkorcid 2; abdelreheem abdelkaderorcid 3; Mohamed Ghazyorcid 4
1fixed prosthodontics, faculty of dentistry Mansoura university
2Associate Professor, Fixed Prosthodontics Dept., Faculty of Dentistry, Mansoura University, Mansoura, Egypt
3Assistant Professor, Fixed Prothodontic, Faculty of Dentistry, Mansoura University
4Professor, Fixed Prosthodontics Department, Mansoura University, Mansoura, Egypt
Abstract
Objectives: To assess the impact of intra-coronal preparation depth and restorative material on the fracture resistance of molar restored by endo-crown restoration.
Materials and Methods: Forty root canal treated maxillary first molars were prepared for endo-crown restorations. Specimens were divided according to the pulpal extension depth and material type into four groups (n=10): teeth prepared with 3 mm pulpal extension and restored by PEEK (TP); teeth prepared with 3 mm pulpal extension and restored by zirconia (TZ); teeth prepared with 5 mm pulpal extension and restored by PEEK (FP); and teeth prepared with 5 mm pulpal extension and restored by zirconia (FZ). After fabrication of the restorations, each endo-crown was cemented to its corresponding tooth. All specimens were thermo-cycled (5,000 cycles - 5°C and 55°C). Each specimen was loaded till failure using universal testing machine, then the mode of failure was recorded. Two-way ANOVA and Tukey’s post-hoc tests were employed for data analysis (P< .05).
Results: The highest fracture load was recorded with FP group (2578.3± 337 N) and the lowest value was recorded with TZ group (1511.42± 168 N). Two-way ANOVA test showed a significant difference among studied groups. Post hoc test showed significant differences between each pair of groups, except a non-significant difference (P = .787) between TZ and FZ groups.
Conclusions: The fracture strength of molars restored with endo-crowns can enhanced by increasing the extension depth into pulp chamber. Moreover, PEEK is considered a promising material for endo-crowns.
Keywords
Endodontically-treated; Failure; Monolithic; Fracture; Endo-crown
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