Fracture resistance and failure modes of lithium disilicate or composite endocrowns.
Niger J Clin Pract
; 21(7): 821-826, 2018 Jul.
Article
em En
| MEDLINE
| ID: mdl-29984710
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 ANDMETHODS:
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.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Resinas Compostas
/
Cimentos de Resina
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Coroas
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Cimentos Dentários
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Porcelana Dentária
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Dente Molar
Tipo de estudo:
Clinical_trials
Limite:
Humans
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article