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Fracture resistance and failure modes of endocrowns manufactured with different CAD/CAM materials under axial and lateral loading.
J Esthet Restor Dent. 2019 Jul; 31(4):378-387.JE

Abstract

OBJECTIVES

The purpose of this in vitro study was to evaluate the fracture resistance and failure modes of endocrowns made of three computer-aided design/computer-aided manufacturing (CAD/CAM) materials subjected to thermo-mechanical cycling loading.

MATERIALS AND METHODS

Eighty mandibular molars were divided into four groups (n = 20): one (C E) was restored with lithium disilicate glass-ceramic conventional crowns, three were restored with endocrowns made of three different CAD/CAM materials; (E E) lithium disilicate glass-ceramic, (E V) zirconia-reinforced lithium silicate glass-ceramic, and (E C) resin nano-ceramic. After cycling loading, half of the samples from each group were loaded axially and the other half was loaded laterally. Fracture resistance was recorded in Newton (N) and failure modes were classified. Two-way ANOVA, Bonferroni post hoc (α = .05), Chi-square, and multiple logistic regression tests were used to analyze data.

RESULTS

Statistically significant interaction were recorded between fracture resistance (N) and loading (P < .001), and groups (conventuional crown and endocrowns; P < .001). Endocrowns presented higher fracture strength than conventional crowns. Fracture resistance was significantly larger under axial loading. The numbers of irreparable failures were extremely important in the endocrowns groups (Groups E E, E V, E C), and only conventional crowns (Group C E) showed almost no irreparable failures under axial loading.

CONCLUSION

Lithium disilicate glass-ceramic recorded the highest fracture resistance under axial and lateral loading.

CLINICAL SIGNIFICANCE

The number of irreparable failures with all endocrown materials tested do not suggest yet the use of this type of restorations in posterior teeth.

Authors+Show Affiliations

Lebanese University, Faculty of Dental Medicine, Department of Prosthodontics, Beirut, Lebanon.University of Zurich, Center for Dental and Oral Medicine, Division of Dental Biomaterials, Zurich, Switzerland.Lebanese University, Faculty of Dental Medicine, Department of Prosthodontics, Beirut, Lebanon.Lebanese University, Faculty of Dental Medicine, Department of Prosthodontics, Beirut, Lebanon.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31067007

Citation

El Ghoul, Wiam, et al. "Fracture Resistance and Failure Modes of Endocrowns Manufactured With Different CAD/CAM Materials Under Axial and Lateral Loading." Journal of Esthetic and Restorative Dentistry : Official Publication of the American Academy of Esthetic Dentistry ... [et Al.], vol. 31, no. 4, 2019, pp. 378-387.
El Ghoul W, Özcan M, Silwadi M, et al. Fracture resistance and failure modes of endocrowns manufactured with different CAD/CAM materials under axial and lateral loading. J Esthet Restor Dent. 2019;31(4):378-387.
El Ghoul, W., Özcan, M., Silwadi, M., & Salameh, Z. (2019). Fracture resistance and failure modes of endocrowns manufactured with different CAD/CAM materials under axial and lateral loading. Journal of Esthetic and Restorative Dentistry : Official Publication of the American Academy of Esthetic Dentistry ... [et Al.], 31(4), 378-387. https://doi.org/10.1111/jerd.12486
El Ghoul W, et al. Fracture Resistance and Failure Modes of Endocrowns Manufactured With Different CAD/CAM Materials Under Axial and Lateral Loading. J Esthet Restor Dent. 2019;31(4):378-387. PubMed PMID: 31067007.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Fracture resistance and failure modes of endocrowns manufactured with different CAD/CAM materials under axial and lateral loading. AU - El Ghoul,Wiam, AU - Özcan,Mutlu, AU - Silwadi,Munir, AU - Salameh,Ziad, Y1 - 2019/05/08/ PY - 2018/11/9/received PY - 2019/1/28/revised PY - 2019/4/9/accepted PY - 2019/5/9/pubmed PY - 2019/12/31/medline PY - 2019/5/9/entrez KW - CAD/CAM KW - Endocrown KW - axial loading KW - fracture resistance KW - glass-ceramic KW - lateral loading KW - resin nano-ceramic SP - 378 EP - 387 JF - Journal of esthetic and restorative dentistry : official publication of the American Academy of Esthetic Dentistry ... [et al.] JO - J Esthet Restor Dent VL - 31 IS - 4 N2 - OBJECTIVES: The purpose of this in vitro study was to evaluate the fracture resistance and failure modes of endocrowns made of three computer-aided design/computer-aided manufacturing (CAD/CAM) materials subjected to thermo-mechanical cycling loading. MATERIALS AND METHODS: Eighty mandibular molars were divided into four groups (n = 20): one (C E) was restored with lithium disilicate glass-ceramic conventional crowns, three were restored with endocrowns made of three different CAD/CAM materials; (E E) lithium disilicate glass-ceramic, (E V) zirconia-reinforced lithium silicate glass-ceramic, and (E C) resin nano-ceramic. After cycling loading, half of the samples from each group were loaded axially and the other half was loaded laterally. Fracture resistance was recorded in Newton (N) and failure modes were classified. Two-way ANOVA, Bonferroni post hoc (α = .05), Chi-square, and multiple logistic regression tests were used to analyze data. RESULTS: Statistically significant interaction were recorded between fracture resistance (N) and loading (P < .001), and groups (conventuional crown and endocrowns; P < .001). Endocrowns presented higher fracture strength than conventional crowns. Fracture resistance was significantly larger under axial loading. The numbers of irreparable failures were extremely important in the endocrowns groups (Groups E E, E V, E C), and only conventional crowns (Group C E) showed almost no irreparable failures under axial loading. CONCLUSION: Lithium disilicate glass-ceramic recorded the highest fracture resistance under axial and lateral loading. CLINICAL SIGNIFICANCE: The number of irreparable failures with all endocrown materials tested do not suggest yet the use of this type of restorations in posterior teeth. SN - 1708-8240 UR - https://www.unboundmedicine.com/medline/citation/31067007/Fracture_resistance_and_failure_modes_of_endocrowns_manufactured_with_different_CAD/CAM_materials_under_axial_and_lateral_loading_ DB - PRIME DP - Unbound Medicine ER -