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Fatigue resistance of CAD/CAM complete crowns with a simplified cementation process.
J Prosthet Dent. 2014 Apr; 111(4):310-7.JP

Abstract

STATEMENT OF PROBLEM

Various computer-aided design and computer-aided manufacturing (CAD/CAM) materials are available to fabricate complete crowns. The type of material may have an effect on the longevity of these restorations.

PURPOSE

To evaluate the fatigue resistance, load-to-failure, failure mode, and antagonistic wear of complete molar computer-aided design and computer-aided manufacturing (CAD/CAM) crowns made of resin nanoceramic (RNC), feldspathic glass ceramic (FEL), or lithium disilicate (LD) placed with a simplified cementation process.

MATERIAL AND METHODS

Forty-five molars received a standardized complete crown preparation and were restored with CAD/CAM crowns (1.5-mm thickness, n=15) made of RNC, FEL, and LD. After cementation, the restorations were submitted to cyclic isometric loading: 200 (×5000), 400, 600, 800, 1000, 1200, and 1400 N at a maximum of 30 000 cycles each. Surviving specimens were axially loaded until failure or to a maximum load of 4500 N. The specimens were analyzed as to failure mode: catastrophic, possibly repairable, and repairable. The groups were compared by using the life table survival analysis and the t test (α=.05).

RESULTS

All the specimens survived the fatigue process until the 800-N step. The survival rate of RNC was 80%, LD 93.3%, and FEL 6.6%. The survival of RNC and LD crowns did not differ from each other but exceeded that of FEL. Postfatigue load-to-failure test was 2500 N (FEL), 3122 N (RNC), and 3237 N (LD). No catastrophic failure occurred in the fatigue test, whereas all of the specimens in the load-to-failure test exhibited catastrophic fractures. Crowns made of RNC seemed to generate the least amount of antagonistic wear.

CONCLUSIONS

Posterior crowns made of RNC and LD were not statistically different, and both had significantly higher fatigue resistance than FEL. All materials survived beyond the normal range of masticatory forces, and all failures were possibly re-restorable except those in the load-to-failure test. RNC crowns seemed to cause less wear of the antagonist.

Authors+Show Affiliations

Graduate student, Department of Restorative Dentistry, Piracicaba School of Dentistry, Campinas State University, Piracicaba, SP, Brazil. Electronic address: aoc1981@hotmail.com.Graduate student, Department of Operative Dentistry, Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil.Associate Professor, Department of Restorative Dentistry, Piracicaba School of Dentistry, Campinas State University, Piracicaba, SP, Brazil.Don and Sybil Harrington Professor of Esthetic Dentistry, Restorative Sciences, Ostrow School of Dentistry, University of Southern California, Los Angeles, Calif.

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

24388720

Citation

Carvalho, Adriana O., et al. "Fatigue Resistance of CAD/CAM Complete Crowns With a Simplified Cementation Process." The Journal of Prosthetic Dentistry, vol. 111, no. 4, 2014, pp. 310-7.
Carvalho AO, Bruzi G, Giannini M, et al. Fatigue resistance of CAD/CAM complete crowns with a simplified cementation process. J Prosthet Dent. 2014;111(4):310-7.
Carvalho, A. O., Bruzi, G., Giannini, M., & Magne, P. (2014). Fatigue resistance of CAD/CAM complete crowns with a simplified cementation process. The Journal of Prosthetic Dentistry, 111(4), 310-7. https://doi.org/10.1016/j.prosdent.2013.09.020
Carvalho AO, et al. Fatigue Resistance of CAD/CAM Complete Crowns With a Simplified Cementation Process. J Prosthet Dent. 2014;111(4):310-7. PubMed PMID: 24388720.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Fatigue resistance of CAD/CAM complete crowns with a simplified cementation process. AU - Carvalho,Adriana O, AU - Bruzi,Greciana, AU - Giannini,Marcelo, AU - Magne,Pascal, Y1 - 2014/01/03/ PY - 2013/05/07/received PY - 2013/09/11/revised PY - 2013/09/13/accepted PY - 2014/1/7/entrez PY - 2014/1/7/pubmed PY - 2014/12/31/medline SP - 310 EP - 7 JF - The Journal of prosthetic dentistry JO - J Prosthet Dent VL - 111 IS - 4 N2 - STATEMENT OF PROBLEM: Various computer-aided design and computer-aided manufacturing (CAD/CAM) materials are available to fabricate complete crowns. The type of material may have an effect on the longevity of these restorations. PURPOSE: To evaluate the fatigue resistance, load-to-failure, failure mode, and antagonistic wear of complete molar computer-aided design and computer-aided manufacturing (CAD/CAM) crowns made of resin nanoceramic (RNC), feldspathic glass ceramic (FEL), or lithium disilicate (LD) placed with a simplified cementation process. MATERIAL AND METHODS: Forty-five molars received a standardized complete crown preparation and were restored with CAD/CAM crowns (1.5-mm thickness, n=15) made of RNC, FEL, and LD. After cementation, the restorations were submitted to cyclic isometric loading: 200 (×5000), 400, 600, 800, 1000, 1200, and 1400 N at a maximum of 30 000 cycles each. Surviving specimens were axially loaded until failure or to a maximum load of 4500 N. The specimens were analyzed as to failure mode: catastrophic, possibly repairable, and repairable. The groups were compared by using the life table survival analysis and the t test (α=.05). RESULTS: All the specimens survived the fatigue process until the 800-N step. The survival rate of RNC was 80%, LD 93.3%, and FEL 6.6%. The survival of RNC and LD crowns did not differ from each other but exceeded that of FEL. Postfatigue load-to-failure test was 2500 N (FEL), 3122 N (RNC), and 3237 N (LD). No catastrophic failure occurred in the fatigue test, whereas all of the specimens in the load-to-failure test exhibited catastrophic fractures. Crowns made of RNC seemed to generate the least amount of antagonistic wear. CONCLUSIONS: Posterior crowns made of RNC and LD were not statistically different, and both had significantly higher fatigue resistance than FEL. All materials survived beyond the normal range of masticatory forces, and all failures were possibly re-restorable except those in the load-to-failure test. RNC crowns seemed to cause less wear of the antagonist. SN - 1097-6841 UR - https://www.unboundmedicine.com/medline/citation/24388720/Fatigue_resistance_of_CAD/CAM_complete_crowns_with_a_simplified_cementation_process_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0022-3913(13)00276-X DB - PRIME DP - Unbound Medicine ER -