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. 2018 Spring;13(2):188-194.
doi: 10.22037/iej.v13i2.19089.

The Effect of Resection Angle on Stress Distribution after Root-End Surgery

Jaiane Bandoli Monteiro  1 , Amanda Maria de Oliveira Dal Piva  1 , João Paulo Mendes Tribst  1 , Alexandre Luiz Souto Borges  1 , Rubens Nisie Tango  1
Affiliations

The Effect of Resection Angle on Stress Distribution after Root-End Surgery

Jaiane Bandoli Monteiro et al. Iran Endod J. 2018 Spring.

Abstract

Introduction: This study aimed to investigate the influence of the resection angle on the stress distribution of retrograde endodontic treated maxillary incisors under oblique-load application.

Methods and materials: A maxillary central incisor which was endodontically treated and restored with a fiber glass post was obtained in a 3-dimensional numerical model and distributed into three groups according to type of resection: control; restored with fiber post without retrograde obturation, R45 and R90 with 45º and 90º resection from tooth axial axis, respectively and restored with Fuji II LC (GC America). The numerical models received a 45º occlusal load of 200 N/cm2 on the middle of lingual surface. All materials and structures were considered linear elastic, homogeneous and isotropic. Numerical models were plotted and meshed with isoparametric elements, and the results were analyzed using maximum principal stress (MPS).

Results: MPS showed greater stress values in the bone tissue for control group than the other groups. Groups with apicectomy showed acceptable stress distribution on the fiber post, cement layer and root dentin, presenting more improved values than control group.

Conclusion: Apicectomy at 90º promotes more homogeneity on stress distribution on the fiber post, cement layer and root dentin, which suggests less probability of failure. However, due to its facility and stress distribution also being better than control group, apicectomy at 45° could be a good choice for clinicians.

Keywords: Apicectomy; Cut Angle; Dental Stress Analysis; Endodontics; Finite Element Analysis; Resection Angle.

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Conflict of interest statement

‘None declared’.

Figures

Figure 1
Figure 1
Schematic illustration of the sequentially performed procedures. A) Ceramic crown; B) Resin cement; C) Core; D) Fiber post; E) Resin cement; F) Root with the apical third resected at 90°; G) Root without resection; H) Root with the apical third resected at 45°; I) Periodontal ligament; J) Medullar bone; K) Cortical bone; L) Gums; M) Final geometry; N) Lateral vision of a incisor restored with a fiber post; O) Lateral vision of a incisor restored with a fiber post and with a resection at 45°; P) Lateral vision of a incisor restored with a fiber post and with a resection at 90°
Figure 2
Figure 2
Maximum Principal Stress (MPa) distribution according to the structures. A) Fiber post; B) Cement line; C) root dentin; D) Bone tissue. From left to right: control group, R45 and R90
Figure 3
Figure 3
Higher values of Maximum Principal Stress (MPa) according to the structures (Fiber post, Cement line and Root dentin) and resection angle
See this image and copyright information in PMC

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