Abstract
ObjectiveThe aim of the present study was to analyze the influence of root canal and glass fiber post diameters on the biomechanical behavior of the dentin/cement/post interface of a root-filled tooth using 3D finite element analysis. Material and MethodsSix models were built using micro-CT imaging data and SolidWorks 2007 software, varying the root canal (C) and the glass fiber post (P) diameters: C1P1-C=1 mm and P=1 mm; C2P1-C=2 mm and P=1 mm; C2P2-C=2 mm and P=2 mm; C3P1-C=3 mm and P=1 mm; C3P2-C=3 mm and P=2 mm; and C3P3-C=3 mm and P=3 mm. The numerical analysis was conducted with ANSYS Workbench 10.0. An oblique force (180 N at 45º) was applied to the palatal surface of the central incisor. The periodontal ligament surface was constrained on the three axes (x=y=z=0). Maximum principal stress (σmax) values were evaluated for the root dentin, cement layer, and glass fiber post. Results:The most evident stress was observed in the glass fiber post at C3P1 (323 MPa), and the maximum stress in the cement layer occurred at C1P1 (43.2 MPa). The stress on the root dentin was almost constant in all models with a peak in tension at C2P1 (64.5 MPa). ConclusionThe greatest discrepancy between root canal and post diameters is favorable for stress concentration at the post surface. The dentin remaining after the various root canal preparations did not increase the stress levels on the root.
Highlights
The reestablishment of function through direct and/or indirect restorations in endodontically treated teeth remains a challenge11,19
Maximum principal stress values were evaluated for the root dentin, cement layer, and glass fiber post
The highest σmax values were observed in model C3P1 (323 MPa), followed by C2P1 and C1P1 (Figure 4) in the incisal region of the post (Figure 5)
Summary
The reestablishment of function through direct and/or indirect restorations in endodontically treated teeth remains a challenge. Tooth architecture is modified during endodontic treatment as a result of caries removal, access to the canal, and instrumentation in the root canal. Tooth architecture is modified during endodontic treatment as a result of caries removal, access to the canal, and instrumentation in the root canal17 All these factors are associated with the higher internal stress induced in these teeth since this force is directly proportional to the fracture resistance and volume of the remaining dental structure. All these factors are associated with the higher internal stress induced in these teeth since this force is directly proportional to the fracture resistance and volume of the remaining dental structure12 This fact becomes critical when excessive reduction of the thickness of the root canal walls occurs as a result of severe caries, over-instrumentation, previous restoration with large-diameter posts, or internal root resorptions. These characteristics may increase the risk of fracture in these teeth relative to teeth with more pulp vitality
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