TY - JOUR
T1 - Probability of survival and failure mode of endodontically treated incisors without ferrule restored with CAD/CAM fiber-reinforced composite (FRC) post-cores
AU - Bergamo, Edmara T.P.
AU - Lopes, Adolfo C.O.
AU - Campos, Tiago M.B.
AU - Amorim, Pedro Henrique
AU - Costa, Fábio
AU - Benalcázar Jalkh, Ernesto B.
AU - Carvalho, Laura F.de
AU - Zahoui, Abbas
AU - Piza, Mariana M.T.
AU - Gutierres, Eliezer
AU - Witek, Lukasz
AU - Bonfante, Estevam A.
N1 - Funding Information:
To Fundação de Amparo a Pesquisa do Estado de São Paulo (FAPESP): Young Investigators Award grants 2012/19078-7 and 2021/06730-7, EMU 2016/18818-8 , and scholarships 2018/03072-6 , BEPE 2019/00452-5 , 2022/07157-1 , 2019/06893-1 and BEPE 2021/08018-2 , 2019/14798-0 , 2020/12874-9 , 2020/16500-6 . To Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) grant # 307255/2021-2 /. To CAPES financial code 001. We have no financial affiliation (e.g., employment, direct payment, stock holdings, retainers, consultantships, patent licensing arrangements or honoraria), or involvement with any commercial organization with direct financial interest in the subject or materials discussed in this manuscript, nor have any such arrangements existed in the past three years.
Funding Information:
To Fundação de Amparo a Pesquisa do Estado de São Paulo (FAPESP): Young Investigators Award grants 2012/19078-7 and 2021/06730-7, EMU 2016/18818-8, and scholarships 2018/03072-6, BEPE 2019/00452-5, 2022/07157-1, 2019/06893-1 and BEPE 2021/08018-2, 2019/14798-0, 2020/12874-9, 2020/16500-6. To Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) grant # 307255/2021-2/. To CAPES financial code 001. We have no financial affiliation (e.g. employment, direct payment, stock holdings, retainers, consultantships, patent licensing arrangements or honoraria), or involvement with any commercial organization with direct financial interest in the subject or materials discussed in this manuscript, nor have any such arrangements existed in the past three years.
Publisher Copyright:
© 2022
PY - 2022/12
Y1 - 2022/12
N2 - Purpose: This study evaluated the probability of survival and failure mode of endodontically treated incisors without ferrule restored with CAD/CAM FRC post-cores. Methods: Root canals of bovine incisors were treated, leaving post preparations of ∼10 mm. Teeth were allocated into three groups: (i) cast metal post-core, (ii) FRC prefabricated post with a direct resin core build-up, and (iii) CAD/CAM FRC post-core. Posts and zirconia crowns were cemented using resin cement. Specimens were subjected to step-stress accelerated-life fatigue testing in water. Use level probability Weibull curves, probability of survival for a mission of 100,000 cycles at 25, 50, and 100 N, Weibull modulus, and characteristic strength were calculated and plotted. Failure mode was examined under a stereomicroscope. Results: Restored incisors demonstrated high probability of survival (93–100%) for missions estimated at 25 and 50 N, irrespective of post-core foundation. At 100 N, incisors restored with metal posts presented significantly higher probability of survival (99%) relative to CAD/CAM posts (79%), whereas FRC groups demonstrated no significant difference. Weibull analysis indicated no significant difference on the Weibull modulus (m = 3.38–5.92). Incisors reconstructed with metal post-cores (431 N) presented significantly higher characteristic strength relative to prefabricated (200 N) and CAD/CAM (202 N) FRC post-cores. While post fracture was the chief failure mode for prefabricated and CAD/CAM FRC post-cores, post and/or root fracture were the main event for metal post-cores. Conclusion: Endodontically treated incisors without ferrule restored with CAD/CAM FRC post-cores presented promising probability of survival for loads compatible with anterior masticatory forces and favorable failure modes.
AB - Purpose: This study evaluated the probability of survival and failure mode of endodontically treated incisors without ferrule restored with CAD/CAM FRC post-cores. Methods: Root canals of bovine incisors were treated, leaving post preparations of ∼10 mm. Teeth were allocated into three groups: (i) cast metal post-core, (ii) FRC prefabricated post with a direct resin core build-up, and (iii) CAD/CAM FRC post-core. Posts and zirconia crowns were cemented using resin cement. Specimens were subjected to step-stress accelerated-life fatigue testing in water. Use level probability Weibull curves, probability of survival for a mission of 100,000 cycles at 25, 50, and 100 N, Weibull modulus, and characteristic strength were calculated and plotted. Failure mode was examined under a stereomicroscope. Results: Restored incisors demonstrated high probability of survival (93–100%) for missions estimated at 25 and 50 N, irrespective of post-core foundation. At 100 N, incisors restored with metal posts presented significantly higher probability of survival (99%) relative to CAD/CAM posts (79%), whereas FRC groups demonstrated no significant difference. Weibull analysis indicated no significant difference on the Weibull modulus (m = 3.38–5.92). Incisors reconstructed with metal post-cores (431 N) presented significantly higher characteristic strength relative to prefabricated (200 N) and CAD/CAM (202 N) FRC post-cores. While post fracture was the chief failure mode for prefabricated and CAD/CAM FRC post-cores, post and/or root fracture were the main event for metal post-cores. Conclusion: Endodontically treated incisors without ferrule restored with CAD/CAM FRC post-cores presented promising probability of survival for loads compatible with anterior masticatory forces and favorable failure modes.
KW - Dental materials
KW - Fatigue
KW - Fiber-reinforced composite
KW - Polymers
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U2 - 10.1016/j.jmbbm.2022.105519
DO - 10.1016/j.jmbbm.2022.105519
M3 - Article
AN - SCOPUS:85140263607
VL - 136
JO - Journal of the Mechanical Behavior of Biomedical Materials
JF - Journal of the Mechanical Behavior of Biomedical Materials
SN - 1751-6161
M1 - 105519
ER -