Fracture strength of root filled premolar teeth restored with silorane and methacrylate-based resin composite.
J Dent
; 43(6): 735-41, 2015 Jun.
Article
en En
| MEDLINE
| ID: mdl-25656772
ABSTRACT
OBJECTIVES:
To compare fracture characteristics of root-filled teeth with variable cavity design restored with a low shrinkage silorane and methacrylate-based resin composite.METHODS:
77 extracted maxillary premolars were divided randomly into seven groups (Group 1) intact teeth; (Groups 2-4) MOD plus endodontic access with the buccopalatal width of the occlusal isthmus equals one third of the intercuspal width; (Groups 5-7) MOD plus endodontic access with the buccopalatal width of the occlusal isthmus equals one half of the intercuspal width. Groups 2 and 5 were left unrestored, Groups 3 and 6 were restored with a silorane-based resin composite (Filtek P90) and Groups 4 and 7 with a methacrylate-based resin composite (Z250). Teeth were loaded in a universal testing machine; load and fracture patterns were recorded and compared statistically using 2-way ANOVA and t-test for pairwise comparisons and 1-way ANOVA with Dunnett test for multiple comparisons.RESULTS:
Unrestored teeth became progressively weaker with more extensive preparations, Group 5 (unfilled ½) showed the lowest fracture load among the groups (71±22N, P<0.001). Restorations increased the fracture strength of unrestored teeth regardless of cavity size (P<0.001), but was still significantly weaker than sound teeth, with no significant difference between silorane and methacrylate groups. Failure of restored teeth was mostly adhesive at the tooth restoration interface.CONCLUSIONS:
Silorane-based resin composite have no superior strengthening effect over the conventional methacrylate-based resin composite in restoration of root filled teeth. Both materials showed similar fracture patterns. CLINICALSIGNIFICANCE:
Root filled teeth are considerably weakened via restorative and endodontic procedures. A direct adhesive restoration will aid in preserving tooth structure as far as it provides enough strength.Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Materiales de Obturación del Conducto Radicular
/
Fracturas de los Dientes
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Raíz del Diente
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Diente Premolar
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Bisfenol A Glicidil Metacrilato
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Resinas Compuestas
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Resinas de Silorano
/
Metacrilatos
Tipo de estudio:
Clinical_trials
Límite:
Humans
Idioma:
En
Revista:
J Dent
Año:
2015
Tipo del documento:
Article