Fracture resistance of root canal-treated molars restored with ceramic overlays with/without different resin composite base materials: an in vitro study.

Autor: Haridy MF; Department of Conservative Dentistry, Faculty of Dentistry, The British University, Al Shorouk city, Egypt. mohamed.haridy@bue.edu.eg.; Department of Conservative Dentistry, Faculty of Dentistry, Cairo University, Cairo, Egypt. mohamed.haridy@bue.edu.eg., Ahmed HS; Department of Conservative Dentistry, Faculty of Dentistry, The British University, Al Shorouk city, Egypt., Kataia MM; Department of Endodontics, Faculty of Dentistry, The British University, Al Shorouk city, Egypt., Saber SM; Department of Endodontics, Faculty of Dentistry, The British University, Al Shorouk city, Egypt.; Department of Endodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt., Schafer E; Central Interdisciplinary Ambulance in the School of Dentistry, University of Münster, Münster, Germany.
Jazyk: angličtina
Zdroj: Odontology [Odontology] 2022 Jul; Vol. 110 (3), pp. 497-507. Date of Electronic Publication: 2022 Jan 22.
DOI: 10.1007/s10266-021-00682-5
Abstrakt: The objective of the study was to evaluate the effect of different restorative protocols on fracture resistance of root canal-treated molars. 48 mandibular first molars were used and divided into six groups (n = 8); G1 (negative control): teeth kept intact. G2 (positive control): teeth had root canal treatment and standard MOD cavity preparations but kept unrestored. G3: prepared as G2 and directly restored with VitaEnamic ceramic overlays (CO). G4: as G3, but the pulp chamber was restored first with smart dental restorative (SureFil SDR flow = SDR) bulk-fill flowable composite base. G5: as G3, but the pulp chamber was restored first with SonicFill (SF) bulk-fill composite base. G6: as G3, but the pulp chamber was restored first with a fiber-reinforced composite (FRC) base. All samples were subjected to thermocycling between 5 °C and 55 °C in a water bath for a total of 2000 cycles with 10 s dwell time. Then specimens were individually mounted on a computer-controlled testing machine with a load cell of 5 kN, and the maximum load to produce fracture (N) was recorded. Data were analyzed using one-way ANOVA followed by Tukey's post hoc test (P = 0.05). There was a significant difference between the groups (P < 0.001). Teeth restored with FRC and ceramic overlays had the highest load-bearing capacity. Pulp chamber restoration with either FRC or SDR before ceramic overlay fabrication provided significantly better tooth reinforcement than ceramic overlay alone (P < 0.001). Fracture modes were analyzed to determine the type of fracture as repairable or catastrophic, where FRC + CO and SDR + CO groups had favorable fracture modes that were mostly repairable. When restoring root canal-treated molars with overlays, the pulp chamber should be sealed with either FRC or SDR to ensure the best possible fracture resistance. The clinical relevance of the study is that a new simple restorative protocol is presented to enhance the survival of root canal-treated molars using ceramic overlays.
(© 2021. The Society of The Nippon Dental University.)
Databáze: MEDLINE
Externí odkaz: