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Fracture resistance of maxillary premolars restored with different endocrown designs and materials after artificial ageing.
J Prosthodont Res. 2022 Jan 11; 66(1):141-150.JP

Abstract

PURPOSE

To evaluate the effect of three different designs and two monolithic ceramic materials on the durability and fracture resistance of endocrowns on maxillary first premolars, in comparison to post-and-core crowns.

METHODS

Fifty-six maxillary premolars were endodontically treated and shortened to a level of 2 mm from the cervical line, and randomly categorized into six endocrown groups and post-and-core crown control group (n=8); E1; endocrowns with flat occlusal table (without ferrule), E2; endocrowns with 1.5 mm circumferential ferrule, E3; endocrowns with 1.5 mm buccal ferrule preparation. Two materials were used for endocrowns: zirconia (4YSZ; Z), and lithium disilicate (L). The control group was restored with zirconia posts, and lithium disilicate crowns. All restorations were bonded using Panavia V5 and its respective primers and underwent thermo-mechanical fatigue with a 10 kg dynamic load for 1,200,000 cycles and thermocycling between 5 and 55 °C. Thereafter all survived specimens were loaded to fracture. The results were statistically analyzed using ANOVA and T-Test.

RESULTS

None of the specimens showed any signs of debonding or fracture caused by the fatigue test. The PC control group showed no statistically significant difference in comparison to groups ZE1, ZE2 and LE2 (p > 0.05). However, it was significantly different from groups LE1, LE3, and ZE3 (p ≤ 0.05).

CONCLUSIONS

Preparation designs and materials affected the fracture resistance of endocrowns. The results showed a superiority of the post-and-core crowns, zirconia/lithium disilicate endocrowns with 1.5 mm circumferential ferrule, and zirconia endocrowns with the flat occlusal table.

Authors+Show Affiliations

Department of Prosthodontics, Propaedeutics and Dental Materials, School of Dentistry, Christian-Albrechts University, Kiel, Germany. Department of Prosthodontics, College of Dentistry, Ibb University, Ibb, Yemen.Department of Prosthodontics, Propaedeutics and Dental Materials, School of Dentistry, Christian-Albrechts University, Kiel, Germany.Department of Prosthodontics, Propaedeutics and Dental Materials, School of Dentistry, Christian-Albrechts University, Kiel, Germany.Department of Prosthodontics, Propaedeutics and Dental Materials, School of Dentistry, Christian-Albrechts University, Kiel, Germany.Department of Prosthodontics, Propaedeutics and Dental Materials, School of Dentistry, Christian-Albrechts University, Kiel, Germany.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

34108294

Citation

Ahmed, Mohamed A A., et al. "Fracture Resistance of Maxillary Premolars Restored With Different Endocrown Designs and Materials After Artificial Ageing." Journal of Prosthodontic Research, vol. 66, no. 1, 2022, pp. 141-150.
Ahmed MAA, Kern M, Mourshed B, et al. Fracture resistance of maxillary premolars restored with different endocrown designs and materials after artificial ageing. J Prosthodont Res. 2022;66(1):141-150.
Ahmed, M. A. A., Kern, M., Mourshed, B., Wille, S., & Chaar, M. S. (2022). Fracture resistance of maxillary premolars restored with different endocrown designs and materials after artificial ageing. Journal of Prosthodontic Research, 66(1), 141-150. https://doi.org/10.2186/jpr.JPR_D_20_00082
Ahmed MAA, et al. Fracture Resistance of Maxillary Premolars Restored With Different Endocrown Designs and Materials After Artificial Ageing. J Prosthodont Res. 2022 Jan 11;66(1):141-150. PubMed PMID: 34108294.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Fracture resistance of maxillary premolars restored with different endocrown designs and materials after artificial ageing. AU - Ahmed,Mohamed A A, AU - Kern,Matthias, AU - Mourshed,Bilal, AU - Wille,Sebastian, AU - Chaar,Mohamed Sad, Y1 - 2021/06/10/ PY - 2021/6/11/pubmed PY - 2022/1/13/medline PY - 2021/6/10/entrez KW - Endocrowns KW - Lithium disilicate KW - Post-and-core crowns KW - Zirconia SP - 141 EP - 150 JF - Journal of prosthodontic research JO - J Prosthodont Res VL - 66 IS - 1 N2 - PURPOSE: To evaluate the effect of three different designs and two monolithic ceramic materials on the durability and fracture resistance of endocrowns on maxillary first premolars, in comparison to post-and-core crowns. METHODS: Fifty-six maxillary premolars were endodontically treated and shortened to a level of 2 mm from the cervical line, and randomly categorized into six endocrown groups and post-and-core crown control group (n=8); E1; endocrowns with flat occlusal table (without ferrule), E2; endocrowns with 1.5 mm circumferential ferrule, E3; endocrowns with 1.5 mm buccal ferrule preparation. Two materials were used for endocrowns: zirconia (4YSZ; Z), and lithium disilicate (L). The control group was restored with zirconia posts, and lithium disilicate crowns. All restorations were bonded using Panavia V5 and its respective primers and underwent thermo-mechanical fatigue with a 10 kg dynamic load for 1,200,000 cycles and thermocycling between 5 and 55 °C. Thereafter all survived specimens were loaded to fracture. The results were statistically analyzed using ANOVA and T-Test. RESULTS: None of the specimens showed any signs of debonding or fracture caused by the fatigue test. The PC control group showed no statistically significant difference in comparison to groups ZE1, ZE2 and LE2 (p > 0.05). However, it was significantly different from groups LE1, LE3, and ZE3 (p ≤ 0.05). CONCLUSIONS: Preparation designs and materials affected the fracture resistance of endocrowns. The results showed a superiority of the post-and-core crowns, zirconia/lithium disilicate endocrowns with 1.5 mm circumferential ferrule, and zirconia endocrowns with the flat occlusal table. SN - 2212-4632 UR - https://www.unboundmedicine.com/medline/citation/34108294/Fracture_resistance_of_maxillary_premolars_restored_with_different_endocrown_designs_and_materials_after_artificial_ageing_ L2 - https://doi.org/10.2186/jpr.JPR_D_20_00082 DB - PRIME DP - Unbound Medicine ER -