Fracture Resistance and Stress Distribution in Endodontically Treated Maxillary Premolars Restored with Composite Resin

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‐...

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Published in:	Journal of prosthodontics Vol. 17; no. 2; pp. 114 - 119
Main Authors:	Soares, Paulo Vinícius, Santos-Filho, Paulo César Freitas, Queiroz, Ellyne Cavalcanti, Araújo, Thiago Caixeta, Campos, Roberto Elias, Araújo, Cleudmar Amaral, Soares, Carlos José
Format:	Journal Article
Language:	English
Published:	Malden, USA Blackwell Publishing Inc 01-02-2008
Subjects:	Bicuspid - physiopathology Biomechanical Phenomena composite resin Composite Resins - chemistry Compressive Strength Computer Simulation Dental Cavity Preparation - methods Dental Restoration, Permanent - methods Dentistry endodontic treatment Finite Element Analysis fracture resistance Gutta-Percha - therapeutic use Humans Materials Testing Maxilla Models, Biological posterior teeth Root Canal Filling Materials - therapeutic use Root Canal Obturation - methods Root Canal Preparation - methods Stress, Mechanical Tooth Fractures - physiopathology Tooth, Nonvital - physiopathology Tooth, Nonvital - therapy
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Summary:	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.
Bibliography:	istex:D90CA4050129438C4623D950BBA683D75C767147 ark:/67375/WNG-GDJH0WD8-G ArticleID:JOPR258 Supported by Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG). ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-News-1 ObjectType-Feature-3 content type line 23
ISSN:	1059-941X 1532-849X
DOI:	10.1111/j.1532-849X.2007.00258.x