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Effect of endodontic access simulation on the fracture strength of lithium-disilicate and resin-matrix ceramic CAD-CAM crowns.
J Esthet Restor Dent. 2020 07; 32(5):472-479.JE

Abstract

OBJECTIVES

The purpose of this in vitro study was to compare the effect of simulated endodontic access preparation on the failure loads of lithium disilicate crowns and resin-matrix ceramic (RMC) crowns.

MATERIALS AND METHODS

Eighty maxillary first premolar crowns were manufactured by using four different CAD/CAM blocks (n = 20): lithium disilicate (LD; IPS e.max CAD), resin nanoceramic (RNC; Lava Ultimate), flexible nanaoceramic (FNC; GC Cerasmart), and polymer-infiltrated ceramic (PIC; VITA Enamic). Half of each group was accessed and repaired to simulate endodontic treatment. After cyclic loading, all specimens were loaded to failure. Data were analyzed with two-way ANOVA followed by Tukey-HSD test (α = .05).

RESULTS

The load to failure results showed significant differences for material types (P < .001), but not for endodontic access simulation (P = .09). The highest and lowest mean failure loads were obtained for LD (1546 N) and PIC (843 N), respectively.

CONCLUSION

The endodontic access preparation was not found to affect the fracture strength of LD and RMC crowns. The LD showed higher fracture strength than RMC crowns. Even though significant differences were noted for failure loads regarding different crown materials, all could reasonably withstand masticatory forces.

CLINICAL SIGNIFICANCE

The endodontic access preparation through a restoration is known to be a common challenge in clinical practice. Maintaining a repaired LD or RMC crown is feasible and replacement may not be necessary.

Authors+Show Affiliations

Department of Prosthodontics, Faculty of Dentistry, Ankara University, Ankara, Turkey.Department of Prosthodontics, Faculty of Dentistry, Ankara University, Ankara, Turkey.University of Zürich, Division of Dental Biomaterials, Center for Dental and Oral Medicine, Clinic for Reconstructive Dentistry, Zürich, Switzerland.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32369271

Citation

Oguz, Ece İrem, et al. "Effect of Endodontic Access Simulation On the Fracture Strength of Lithium-disilicate and Resin-matrix Ceramic CAD-CAM Crowns." Journal of Esthetic and Restorative Dentistry : Official Publication of the American Academy of Esthetic Dentistry ... [et Al.], vol. 32, no. 5, 2020, pp. 472-479.
Oguz Eİ, Kılıçarslan MA, Özcan M. Effect of endodontic access simulation on the fracture strength of lithium-disilicate and resin-matrix ceramic CAD-CAM crowns. J Esthet Restor Dent. 2020;32(5):472-479.
Oguz, E. İ., Kılıçarslan, M. A., & Özcan, M. (2020). Effect of endodontic access simulation on the fracture strength of lithium-disilicate and resin-matrix ceramic CAD-CAM crowns. Journal of Esthetic and Restorative Dentistry : Official Publication of the American Academy of Esthetic Dentistry ... [et Al.], 32(5), 472-479. https://doi.org/10.1111/jerd.12591
Oguz Eİ, Kılıçarslan MA, Özcan M. Effect of Endodontic Access Simulation On the Fracture Strength of Lithium-disilicate and Resin-matrix Ceramic CAD-CAM Crowns. J Esthet Restor Dent. 2020;32(5):472-479. PubMed PMID: 32369271.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of endodontic access simulation on the fracture strength of lithium-disilicate and resin-matrix ceramic CAD-CAM crowns. AU - Oguz,Ece İrem, AU - Kılıçarslan,Mehmet Ali, AU - Özcan,Mutlu, Y1 - 2020/05/05/ PY - 2020/03/15/received PY - 2020/04/03/revised PY - 2020/04/13/accepted PY - 2020/5/6/pubmed PY - 2020/7/28/medline PY - 2020/5/6/entrez KW - CAD/CAM KW - fracture strength KW - lithium disilicate KW - resin-matrix ceramic KW - root canal treatment SP - 472 EP - 479 JF - Journal of esthetic and restorative dentistry : official publication of the American Academy of Esthetic Dentistry ... [et al.] JO - J Esthet Restor Dent VL - 32 IS - 5 N2 - OBJECTIVES: The purpose of this in vitro study was to compare the effect of simulated endodontic access preparation on the failure loads of lithium disilicate crowns and resin-matrix ceramic (RMC) crowns. MATERIALS AND METHODS: Eighty maxillary first premolar crowns were manufactured by using four different CAD/CAM blocks (n = 20): lithium disilicate (LD; IPS e.max CAD), resin nanoceramic (RNC; Lava Ultimate), flexible nanaoceramic (FNC; GC Cerasmart), and polymer-infiltrated ceramic (PIC; VITA Enamic). Half of each group was accessed and repaired to simulate endodontic treatment. After cyclic loading, all specimens were loaded to failure. Data were analyzed with two-way ANOVA followed by Tukey-HSD test (α = .05). RESULTS: The load to failure results showed significant differences for material types (P < .001), but not for endodontic access simulation (P = .09). The highest and lowest mean failure loads were obtained for LD (1546 N) and PIC (843 N), respectively. CONCLUSION: The endodontic access preparation was not found to affect the fracture strength of LD and RMC crowns. The LD showed higher fracture strength than RMC crowns. Even though significant differences were noted for failure loads regarding different crown materials, all could reasonably withstand masticatory forces. CLINICAL SIGNIFICANCE: The endodontic access preparation through a restoration is known to be a common challenge in clinical practice. Maintaining a repaired LD or RMC crown is feasible and replacement may not be necessary. SN - 1708-8240 UR - https://www.unboundmedicine.com/medline/citation/32369271/Effect_of_endodontic_access_simulation_on_the_fracture_strength_of_lithium_disilicate_and_resin_matrix_ceramic_CAD_CAM_crowns_ DB - PRIME DP - Unbound Medicine ER -