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Fracture resistance and failure modes of lithium disilicate or composite endocrowns.
Niger J Clin Pract. 2018 Jul; 21(7):821-826.NJ

Abstract

PURPOSE

The aim of this study was to determine the fracture strength of endocrowns made of lithium disilicate ceramic and two different indirect resin composites.

MATERIALS AND METHODS

Forty human mandibular molars were randomly separated into four groups (n = 10 in each group) - Group IN: control group, Group IPS: endocrowns made of lithium disilicate ceramic (IPS e.max CAD, IvoclarVivadent, Schaan, Liechtenstein); Group SL: Endocrowns made of Solidex microhybrid composite (Shofu, Ratingen, Germany); and Group GR: Endocrowns made of Grandia microhybrid composite (GC Europa, Leuven, Belgium). In all of the groups, dual-cure resin cement (Relyx Ultimate Clicker, 3M ESPE, St. Paul, MN, USA) was used to cement the endocrowns. All of the teeth were subjected to fracture by means of a universal testing machine (Instron), and compressive force was applied. The failure type and location after fracture were classified. The data were analyzed using one-way ANOVA, Tukey's post hoc test, and Chi-square test (P < 0.05).

RESULTS

Group IPS showed significantly higher fracture strength than Groups SL and GR (P < 0.05). There was no significant difference between the SL and GR groups (P > 0.05). In Group SL, 80% of the specimens exhibited favorable fractures; also, 60% of the specimens exhibited favorable fracture in group GR, and only 10% of the specimens exhibited favorable fracture in group IPS.

CONCLUSIONS

The lithium disilicate ceramic endocrowns exhibited higher fracture resistance than indirect composite groups. Both of the composite endocrowns showed more favorable failure than the lithium disilicate ceramic endocrowns.

Authors+Show Affiliations

Department of Prosthetic Dentistry, Yeditepe University, Istanbul, Turkey.Department of Prosthetic Dentistry, Yeni Yuzyıl University, Istanbul, Turkey.Department of Prosthetic Dentistry, Yeni Yuzyıl University, Istanbul, Turkey.Department of Restorative Dentistry, Bezmialem Vakıf University, Istanbul, Turkey.

Pub Type(s)

Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

29984710

Citation

Altier, M, et al. "Fracture Resistance and Failure Modes of Lithium Disilicate or Composite Endocrowns." Nigerian Journal of Clinical Practice, vol. 21, no. 7, 2018, pp. 821-826.
Altier M, Erol F, Yildirim G, et al. Fracture resistance and failure modes of lithium disilicate or composite endocrowns. Niger J Clin Pract. 2018;21(7):821-826.
Altier, M., Erol, F., Yildirim, G., & Dalkilic, E. E. (2018). Fracture resistance and failure modes of lithium disilicate or composite endocrowns. Nigerian Journal of Clinical Practice, 21(7), 821-826. https://doi.org/10.4103/njcp.njcp_175_17
Altier M, et al. Fracture Resistance and Failure Modes of Lithium Disilicate or Composite Endocrowns. Niger J Clin Pract. 2018;21(7):821-826. PubMed PMID: 29984710.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Fracture resistance and failure modes of lithium disilicate or composite endocrowns. AU - Altier,M, AU - Erol,F, AU - Yildirim,G, AU - Dalkilic,E E, PY - 2018/7/10/entrez PY - 2018/7/10/pubmed PY - 2018/9/1/medline KW - Composite resins KW - endocrown KW - lithium disilicate ceramic SP - 821 EP - 826 JF - Nigerian journal of clinical practice JO - Niger J Clin Pract VL - 21 IS - 7 N2 - PURPOSE: The aim of this study was to determine the fracture strength of endocrowns made of lithium disilicate ceramic and two different indirect resin composites. MATERIALS AND METHODS: Forty human mandibular molars were randomly separated into four groups (n = 10 in each group) - Group IN: control group, Group IPS: endocrowns made of lithium disilicate ceramic (IPS e.max CAD, IvoclarVivadent, Schaan, Liechtenstein); Group SL: Endocrowns made of Solidex microhybrid composite (Shofu, Ratingen, Germany); and Group GR: Endocrowns made of Grandia microhybrid composite (GC Europa, Leuven, Belgium). In all of the groups, dual-cure resin cement (Relyx Ultimate Clicker, 3M ESPE, St. Paul, MN, USA) was used to cement the endocrowns. All of the teeth were subjected to fracture by means of a universal testing machine (Instron), and compressive force was applied. The failure type and location after fracture were classified. The data were analyzed using one-way ANOVA, Tukey's post hoc test, and Chi-square test (P < 0.05). RESULTS: Group IPS showed significantly higher fracture strength than Groups SL and GR (P < 0.05). There was no significant difference between the SL and GR groups (P > 0.05). In Group SL, 80% of the specimens exhibited favorable fractures; also, 60% of the specimens exhibited favorable fracture in group GR, and only 10% of the specimens exhibited favorable fracture in group IPS. CONCLUSIONS: The lithium disilicate ceramic endocrowns exhibited higher fracture resistance than indirect composite groups. Both of the composite endocrowns showed more favorable failure than the lithium disilicate ceramic endocrowns. SN - 1119-3077 UR - https://www.unboundmedicine.com/medline/citation/29984710/Fracture_resistance_and_failure_modes_of_lithium_disilicate_or_composite_endocrowns_ L2 - http://www.njcponline.com/article.asp?issn=1119-3077;year=2018;volume=21;issue=7;spage=821;epage=826;aulast=Altier DB - PRIME DP - Unbound Medicine ER -