Fracture resistance and stress distribution in endodontically treated maxillary premolars restored with composite resin.

Autor: Soares PV; Biomechanical Group, Department of Operative Dentistry and Dental Materials, Dental School of Federal University of Uberlandia, Minas Gerais, BrazilLaboratory of Mechanical Projects, Mechanical Engineering School of Federal University of Uberlandia, Minas Gerais, Brazil., Santos-Filho PCF; Biomechanical Group, Department of Operative Dentistry and Dental Materials, Dental School of Federal University of Uberlandia, Minas Gerais, BrazilLaboratory of Mechanical Projects, Mechanical Engineering School of Federal University of Uberlandia, Minas Gerais, Brazil., Queiroz EC; Biomechanical Group, Department of Operative Dentistry and Dental Materials, Dental School of Federal University of Uberlandia, Minas Gerais, BrazilLaboratory of Mechanical Projects, Mechanical Engineering School of Federal University of Uberlandia, Minas Gerais, Brazil., Araújo TC; Biomechanical Group, Department of Operative Dentistry and Dental Materials, Dental School of Federal University of Uberlandia, Minas Gerais, BrazilLaboratory of Mechanical Projects, Mechanical Engineering School of Federal University of Uberlandia, Minas Gerais, Brazil., Campos RE; Biomechanical Group, Department of Operative Dentistry and Dental Materials, Dental School of Federal University of Uberlandia, Minas Gerais, BrazilLaboratory of Mechanical Projects, Mechanical Engineering School of Federal University of Uberlandia, Minas Gerais, Brazil., Araújo CA; Biomechanical Group, Department of Operative Dentistry and Dental Materials, Dental School of Federal University of Uberlandia, Minas Gerais, BrazilLaboratory of Mechanical Projects, Mechanical Engineering School of Federal University of Uberlandia, Minas Gerais, Brazil., Soares CJ; Biomechanical Group, Department of Operative Dentistry and Dental Materials, Dental School of Federal University of Uberlandia, Minas Gerais, BrazilLaboratory of Mechanical Projects, Mechanical Engineering School of Federal University of Uberlandia, Minas Gerais, Brazil.
Jazyk: angličtina
Zdroj: Journal of prosthodontics : official journal of the American College of Prosthodontists [J Prosthodont] 2008 Feb; Vol. 17 (2), pp. 114-119. Date of Electronic Publication: 2007 Oct 30.
DOI: 10.1111/j.1532-849X.2007.00258.x
Abstrakt: Purpose: The aim of this study was to evaluate the effect of endodontic and restorative treatment on the fracture resistance of posterior teeth.
Materials and Methods: Fifty intact premolars were selected and randomly placed into five groups (n = 10): G1, intact teeth (control); G2, mesial-occlusal-distal (MOD) preparation; G3, MOD preparation restored with composite resin (Z-250, 3M ESPE); G4, MOD preparation and endodontic treatment; and G5, MOD preparation, endodontic treatment, and composite resin restoration. The specimens were submitted to an axial compression load in a mechanical test machine (EMIC), at a speed of 0.5 mm/min. Fracture patterns were analyzed at four levels. Five 2D numerical models were created by Ansys 10.0 for finite element analysis (FEA).
Results: Mean values of compressive strength for all groups were (Kgf): G1 (83.6 +/- 25.4); G2 (52.7 +/- 20.2); G3 (82.1 +/- 24.9); G4 (40.2 +/- 14.2); G5 (64.5 +/- 18.1). Statistical analysis (ANOVA and Tukey's test) showed that fracture resistance of G1 was significantly higher than that of G5, G2, and G4. Resistance of G3 was also higher than that of G2 and G4. Results showed that the tooth resistance is completely maintained when MOD preparation is restored with composite resin and partially recovered when MOD preparation associated with an endodontic access is restored in the same way. The endodontic treatment and composite resin restoration influenced stress distribution in the dental structure.
Conclusions: Composite resin restoration plays an important role in recovering tooth strength. With regard to fracture mode, restoration and endodontic treatment increased the incidence of periodontal involvement, which was demonstrated by association with the finite element mechanical test method.
Databáze: MEDLINE
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