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Effect of Inlays, Onlays and Endocrown Cavity Design Preparation on Fracture Resistance and Fracture Mode of Endodontically Treated Teeth: An In Vitro Study.
J Prosthodont. 2021 Aug; 30(7):625-631.JP

Abstract

PURPOSE

To evaluate the fracture resistance and failure modes of endodontically treated mandibular molars restored with different designs of inlays, onlays and endocrowns.

MATERIALS AND METHODS

Extracted mandibular third molars (n = 180) were used. An access cavity was prepared on the occlusal surface of each tooth and the roots were obturated with gutta percha. All specimens were randomly divided into 6 groups (n = 30/group) according to the cavity design and the restoration material used. C: control group without access cavity preparation. IE: MOD inlay preparation with EverX Posterior (GC Europe) in the pulp chamber. IG: MOD inlay preparation with G-aenial Universal Flo (GC America) in the pulp chamber. OE: onlay preparation with EverX Posterior (GC Europe) in the pulp chamber. OG: onlay preparation with G-aenial Universal Flo (GC America) in the pulp chamber. EC: endocrown with an empty pulp chamber. All restorations were fabricated with CAD/CAM system using CERASMART® (GC Dental products Europe, Belgium) CAD/CAM blocks. Specimens were thermal-cycled and were subjected to a compressive load applied at 30° angle relative to the long axis of the tooth with a universal testing machine. Results were statistically analyzed by ANOVA followed by Tukey post hoc tests. Chi-square test and Fisher Exact tests were used for the comparisons among groups.

RESULTS

The mean fracture strength was significantly different between the groups (p < 0.001); it was significantly highest for intact teeth, followed by endocrowns (p = 0.021). The strength was significantly lower for inlays (with G-aenial Universal Flo and EverX Posterior), intermediate for onlays with EverX Posterior followed by onlays with G-aenial Universal Flo.

CONCLUSIONS

Endocrowns exhibited higher fracture resistance than other tested composite resin groups. Endocrowns and onlays showed a more favorable failure mode than inlay restorations.

Authors+Show Affiliations

Department of Esthetic and Restorative Dentistry, Saint-Joseph University, School of Dentistry, Beirut, Lebanon.Department of Prosthodontics, Lebanese University, School of Dentistry, Beirut, Lebanon.Department of Esthetic and Restorative Dentistry, Saint-Joseph University, School of Dentistry, Beirut, Lebanon.Advanced Education Program in Implant Dentistry, Loma Linda University, School of Dentistry, Loma Linda, CA.Esthetic and Restorative Dentistry, Saint-Joseph University, School of Dentistry, Beirut, Lebanon.Dental Materials, Saint-Joseph University, School of Dentistry, Beirut, Lebanon.Esthetic and Restorative Dentistry, Saint-Joseph University, School of Dentistry, Beirut, Lebanon.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

33219727

Citation

Kassis, Cynthia, et al. "Effect of Inlays, Onlays and Endocrown Cavity Design Preparation On Fracture Resistance and Fracture Mode of Endodontically Treated Teeth: an in Vitro Study." Journal of Prosthodontics : Official Journal of the American College of Prosthodontists, vol. 30, no. 7, 2021, pp. 625-631.
Kassis C, Khoury P, Mehanna CZ, et al. Effect of Inlays, Onlays and Endocrown Cavity Design Preparation on Fracture Resistance and Fracture Mode of Endodontically Treated Teeth: An In Vitro Study. J Prosthodont. 2021;30(7):625-631.
Kassis, C., Khoury, P., Mehanna, C. Z., Baba, N. Z., Bou Chebel, F., Daou, M., & Hardan, L. (2021). Effect of Inlays, Onlays and Endocrown Cavity Design Preparation on Fracture Resistance and Fracture Mode of Endodontically Treated Teeth: An In Vitro Study. Journal of Prosthodontics : Official Journal of the American College of Prosthodontists, 30(7), 625-631. https://doi.org/10.1111/jopr.13294
Kassis C, et al. Effect of Inlays, Onlays and Endocrown Cavity Design Preparation On Fracture Resistance and Fracture Mode of Endodontically Treated Teeth: an in Vitro Study. J Prosthodont. 2021;30(7):625-631. PubMed PMID: 33219727.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of Inlays, Onlays and Endocrown Cavity Design Preparation on Fracture Resistance and Fracture Mode of Endodontically Treated Teeth: An In Vitro Study. AU - Kassis,Cynthia, AU - Khoury,Pierre, AU - Mehanna,Carina Z, AU - Baba,Nadim Z, AU - Bou Chebel,Fadi, AU - Daou,Maha, AU - Hardan,Louis, Y1 - 2021/01/06/ PY - 2020/11/16/accepted PY - 2020/11/22/pubmed PY - 2021/7/29/medline PY - 2020/11/21/entrez KW - CAD/CAM KW - Endodontically treated teeth KW - endocrowns KW - failure mode KW - nanoceramic, inlays KW - onlays KW - resistance to fracture SP - 625 EP - 631 JF - Journal of prosthodontics : official journal of the American College of Prosthodontists JO - J Prosthodont VL - 30 IS - 7 N2 - PURPOSE: To evaluate the fracture resistance and failure modes of endodontically treated mandibular molars restored with different designs of inlays, onlays and endocrowns. MATERIALS AND METHODS: Extracted mandibular third molars (n = 180) were used. An access cavity was prepared on the occlusal surface of each tooth and the roots were obturated with gutta percha. All specimens were randomly divided into 6 groups (n = 30/group) according to the cavity design and the restoration material used. C: control group without access cavity preparation. IE: MOD inlay preparation with EverX Posterior (GC Europe) in the pulp chamber. IG: MOD inlay preparation with G-aenial Universal Flo (GC America) in the pulp chamber. OE: onlay preparation with EverX Posterior (GC Europe) in the pulp chamber. OG: onlay preparation with G-aenial Universal Flo (GC America) in the pulp chamber. EC: endocrown with an empty pulp chamber. All restorations were fabricated with CAD/CAM system using CERASMART® (GC Dental products Europe, Belgium) CAD/CAM blocks. Specimens were thermal-cycled and were subjected to a compressive load applied at 30° angle relative to the long axis of the tooth with a universal testing machine. Results were statistically analyzed by ANOVA followed by Tukey post hoc tests. Chi-square test and Fisher Exact tests were used for the comparisons among groups. RESULTS: The mean fracture strength was significantly different between the groups (p < 0.001); it was significantly highest for intact teeth, followed by endocrowns (p = 0.021). The strength was significantly lower for inlays (with G-aenial Universal Flo and EverX Posterior), intermediate for onlays with EverX Posterior followed by onlays with G-aenial Universal Flo. CONCLUSIONS: Endocrowns exhibited higher fracture resistance than other tested composite resin groups. Endocrowns and onlays showed a more favorable failure mode than inlay restorations. SN - 1532-849X UR - https://www.unboundmedicine.com/medline/citation/33219727/Effect_of_Inlays_Onlays_and_Endocrown_Cavity_Design_Preparation_on_Fracture_Resistance_and_Fracture_Mode_of_Endodontically_Treated_Teeth:_An_In_Vitro_Study_ DB - PRIME DP - Unbound Medicine ER -