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Fracture strength of minimally prepared all-ceramic CEREC crowns after simulating 5 years of service.
Dent Mater. 2013 Jun; 29(6):e70-7.DM

Abstract

OBJECTIVES

To examine the strength and mode of fracture of traditionally and minimally prepared all-ceramic resin bonded CAD/CAM crowns after fatigue loading.

METHODS

Thirty human maxillary molars were used and divided in three groups namely; traditional crown preparation group (I), minimal crown preparation group (II) and occlusal veneer preparation group (III). A leucite reinforced glass ceramic (IPS Empress CAD) was used for fabricating the crowns. The CEREC InEOS system (v3.10) was used for scanning, designing and milling. Five years of clinical service were simulated and the fracture strength of the crowns was measured. One-way ANOVA and Kruskal-Wallis test were used for data analysis (α=0.05).

RESULTS

The mean fracture strength and SD in Group I was 1070N (±181) and in Group II 1110N (±222). One-way ANOVA analysis showed no statistically significant difference between the two groups (p>0.05). In Group III all restorations developed cracks during TCML and were not subjected to fracture loading. Three of the traditionally designed crowns (Group I) and 4 of the minimally designed crowns (Group II) developed surface cracks during TCML.

SIGNIFICANCE

Minimal all-ceramic resin-bonded crowns can potentially form a viable restorative option as they demonstrated comparable strength to traditional all-ceramic crowns. However, this should be interpreted with caution as a number of crowns showed cracks after 5 years of simulated service. All the occlusal veneers developed cracks during simulation and further investigation is needed for this to be considered a viable option.

Authors+Show Affiliations

Academic Unit of Restorative Dentistry, School of Clinical Dentistry, University of Sheffield, Sheffield, UK.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

23618556

Citation

Skouridou, Nikoleta, et al. "Fracture Strength of Minimally Prepared All-ceramic CEREC Crowns After Simulating 5 Years of Service." Dental Materials : Official Publication of the Academy of Dental Materials, vol. 29, no. 6, 2013, pp. e70-7.
Skouridou N, Pollington S, Rosentritt M, et al. Fracture strength of minimally prepared all-ceramic CEREC crowns after simulating 5 years of service. Dent Mater. 2013;29(6):e70-7.
Skouridou, N., Pollington, S., Rosentritt, M., & Tsitrou, E. (2013). Fracture strength of minimally prepared all-ceramic CEREC crowns after simulating 5 years of service. Dental Materials : Official Publication of the Academy of Dental Materials, 29(6), e70-7. https://doi.org/10.1016/j.dental.2013.03.019
Skouridou N, et al. Fracture Strength of Minimally Prepared All-ceramic CEREC Crowns After Simulating 5 Years of Service. Dent Mater. 2013;29(6):e70-7. PubMed PMID: 23618556.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Fracture strength of minimally prepared all-ceramic CEREC crowns after simulating 5 years of service. AU - Skouridou,Nikoleta, AU - Pollington,Sarah, AU - Rosentritt,Martin, AU - Tsitrou,Effrosyni, Y1 - 2013/04/22/ PY - 2012/05/30/received PY - 2013/03/20/revised PY - 2013/03/22/accepted PY - 2013/4/27/entrez PY - 2013/4/27/pubmed PY - 2014/5/7/medline SP - e70 EP - 7 JF - Dental materials : official publication of the Academy of Dental Materials JO - Dent Mater VL - 29 IS - 6 N2 - OBJECTIVES: To examine the strength and mode of fracture of traditionally and minimally prepared all-ceramic resin bonded CAD/CAM crowns after fatigue loading. METHODS: Thirty human maxillary molars were used and divided in three groups namely; traditional crown preparation group (I), minimal crown preparation group (II) and occlusal veneer preparation group (III). A leucite reinforced glass ceramic (IPS Empress CAD) was used for fabricating the crowns. The CEREC InEOS system (v3.10) was used for scanning, designing and milling. Five years of clinical service were simulated and the fracture strength of the crowns was measured. One-way ANOVA and Kruskal-Wallis test were used for data analysis (α=0.05). RESULTS: The mean fracture strength and SD in Group I was 1070N (±181) and in Group II 1110N (±222). One-way ANOVA analysis showed no statistically significant difference between the two groups (p>0.05). In Group III all restorations developed cracks during TCML and were not subjected to fracture loading. Three of the traditionally designed crowns (Group I) and 4 of the minimally designed crowns (Group II) developed surface cracks during TCML. SIGNIFICANCE: Minimal all-ceramic resin-bonded crowns can potentially form a viable restorative option as they demonstrated comparable strength to traditional all-ceramic crowns. However, this should be interpreted with caution as a number of crowns showed cracks after 5 years of simulated service. All the occlusal veneers developed cracks during simulation and further investigation is needed for this to be considered a viable option. SN - 1879-0097 UR - https://www.unboundmedicine.com/medline/citation/23618556/Fracture_strength_of_minimally_prepared_all_ceramic_CEREC_crowns_after_simulating_5_years_of_service_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0109-5641(13)00069-9 DB - PRIME DP - Unbound Medicine ER -