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Accelerated fatigue resistance of endodontically treated incisors without ferrule restored with CAD/CAM endocrowns.
Int J Esthet Dent. 2021 Oct 29; 16(4):534-552.IJ

Abstract

PURPOSE

The present study aimed to investigate the resistance and failure mode of broken-down endodontically treated incisors without ferrule restored with CAD/CAM endocrowns.

MATERIALS AND METHODS

Endodontically treated bovine incisors (N = 30) without ferrule were divided into two groups and restored with two types of CAD/CAM endocrowns: lithium disilicate (Eld) or resin nanoceramics (Erc). The preparations included a 4-mm-deep 'internal ferrule' and immediate dentin sealing. The samples were subjected to accelerated fatigue testing. Cyclic isometric loading was applied to the incisal edge at a 30-degree angle at a frequency of 5 Hz, beginning with a load of 100 N (5,000 cycles). A 100 N load increase was applied every 15,000 cycles. Specimens were loaded until failure or to a maximum of 140,000 cycles. Previously published data from the same authors regarding lithium disilicate crowns over post-and-core buildups without ferrule (NfPf), core buildups without post without ferrule (NfNpFR), and with a 2-mm ferrule (FNp) using the same experimental setup were included for comparison. Groups were compared using the Kaplan Meier survival analysis for cycles (log rank pairwise post hoc test comparisons at P = 0.05) and Life Table survival analysis for load at failure, followed by the Wilcoxon pairwise comparison at P = 0.05.

RESULTS

All specimens failed before 140,000 load cycles. There was no statistically significant difference between the endocrown materials (Eld: 53,448 mean endured cycles; Erc: 52,397 mean endured cycles; P = 0.844). Endocrowns outperformed the group with lithium disilicate crowns on incisors without ferrule and post-and-core buildup (NfPf with mean endured 35,025 cycles), showed no statistical difference compared with the group with no-post fiber-reinforced composite resin core buildup (NfNpFR with 45,557 mean endured cycles), and had a lower survival rate compared with the group with ferrule (FNp with mean endured 73,244 cycles). Endocrowns generated a majority of non-catastrophic failures (with an advantage for Erc), while 100% of catastrophic failures were found in the group with a post.

CONCLUSIONS

CAD/CAM endocrowns of nonvital incisors without ferrule improved the resistance and optimized the failure mode when compared with traditional bonded crowns with adhesive post-and-core and no-post buildups.

Authors

No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

34694078

Citation

de Carvalho, Marco Aurélio, et al. "Accelerated Fatigue Resistance of Endodontically Treated Incisors Without Ferrule Restored With CAD/CAM Endocrowns." The International Journal of Esthetic Dentistry, vol. 16, no. 4, 2021, pp. 534-552.
de Carvalho MA, Lazari-Carvalho PC, Del Bel Cury AA, et al. Accelerated fatigue resistance of endodontically treated incisors without ferrule restored with CAD/CAM endocrowns. Int J Esthet Dent. 2021;16(4):534-552.
de Carvalho, M. A., Lazari-Carvalho, P. C., Del Bel Cury, A. A., & Magne, P. (2021). Accelerated fatigue resistance of endodontically treated incisors without ferrule restored with CAD/CAM endocrowns. The International Journal of Esthetic Dentistry, 16(4), 534-552.
de Carvalho MA, et al. Accelerated Fatigue Resistance of Endodontically Treated Incisors Without Ferrule Restored With CAD/CAM Endocrowns. Int J Esthet Dent. 2021 Oct 29;16(4):534-552. PubMed PMID: 34694078.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Accelerated fatigue resistance of endodontically treated incisors without ferrule restored with CAD/CAM endocrowns. AU - de Carvalho,Marco Aurélio, AU - Lazari-Carvalho,Priscilla Cardoso, AU - Del Bel Cury,Altair A, AU - Magne,Pascal, PY - 2021/10/25/entrez PY - 2021/10/26/pubmed PY - 2021/10/28/medline SP - 534 EP - 552 JF - The international journal of esthetic dentistry JO - Int J Esthet Dent VL - 16 IS - 4 N2 - PURPOSE: The present study aimed to investigate the resistance and failure mode of broken-down endodontically treated incisors without ferrule restored with CAD/CAM endocrowns. MATERIALS AND METHODS: Endodontically treated bovine incisors (N = 30) without ferrule were divided into two groups and restored with two types of CAD/CAM endocrowns: lithium disilicate (Eld) or resin nanoceramics (Erc). The preparations included a 4-mm-deep 'internal ferrule' and immediate dentin sealing. The samples were subjected to accelerated fatigue testing. Cyclic isometric loading was applied to the incisal edge at a 30-degree angle at a frequency of 5 Hz, beginning with a load of 100 N (5,000 cycles). A 100 N load increase was applied every 15,000 cycles. Specimens were loaded until failure or to a maximum of 140,000 cycles. Previously published data from the same authors regarding lithium disilicate crowns over post-and-core buildups without ferrule (NfPf), core buildups without post without ferrule (NfNpFR), and with a 2-mm ferrule (FNp) using the same experimental setup were included for comparison. Groups were compared using the Kaplan Meier survival analysis for cycles (log rank pairwise post hoc test comparisons at P = 0.05) and Life Table survival analysis for load at failure, followed by the Wilcoxon pairwise comparison at P = 0.05. RESULTS: All specimens failed before 140,000 load cycles. There was no statistically significant difference between the endocrown materials (Eld: 53,448 mean endured cycles; Erc: 52,397 mean endured cycles; P = 0.844). Endocrowns outperformed the group with lithium disilicate crowns on incisors without ferrule and post-and-core buildup (NfPf with mean endured 35,025 cycles), showed no statistical difference compared with the group with no-post fiber-reinforced composite resin core buildup (NfNpFR with 45,557 mean endured cycles), and had a lower survival rate compared with the group with ferrule (FNp with mean endured 73,244 cycles). Endocrowns generated a majority of non-catastrophic failures (with an advantage for Erc), while 100% of catastrophic failures were found in the group with a post. CONCLUSIONS: CAD/CAM endocrowns of nonvital incisors without ferrule improved the resistance and optimized the failure mode when compared with traditional bonded crowns with adhesive post-and-core and no-post buildups. SN - 2198-591X UR - https://www.unboundmedicine.com/medline/citation/34694078/Accelerated_fatigue_resistance_of_endodontically_treated_incisors_without_ferrule_restored_with_CAD/CAM_endocrowns_ L2 - https://www.quintessence-publishing.com/deu/en/article/2187933 DB - PRIME DP - Unbound Medicine ER -