Abstract
Statement of problem
Preserving teeth with radicular cracks with or without a periodontal pocket is an
alternative to extraction. However, an effective protocol for the restoration of radicular
cracks is lacking.
Purpose
The purpose of this study was to examine the composite resin core level and periodontal
pocket depth effects on stress distribution, maximum von Mises stress, and crack propagation
in endodontically treated teeth by using the extended finite element (FE) method.
Material and methods
Four 3-dimensional models of a cracked endodontically treated mandibular first molar
were constructed: PP2C2 (periodontal pocket depth, 2 mm; composite resin core level,
2 mm below the canal orifice level); PP2C4 (periodontal pocket depth, 2 mm; composite
resin core level, 2 mm below the crack level); PP4C2 (periodontal pocket depth, 4
mm; composite resin core level, 2 mm below the canal orifice level); and PP4C4 (periodontal
pocket depth, 4 mm; composite resin core level, 2 mm below the crack level). The crack
initiation was at the same level in all models. A static 700-N load was applied to
the models in a vertical direction.
Results
The highest stress in dentin was observed in PP2C2, whereas PP2C4 exhibited the lowest
stress and least crack propagation. Stress was high in the dentin and supporting bone.
No reduction in crack propagation was observed in the PP4 models, regardless of the
composite resin core level.
Conclusions
The periodontal pocket depth (2 mm and 4 mm) and composite resin core level (2 mm
below the crack level and 2 mm below the canal orifice level) affected stress concentration
in dentin, resulting in different patterns of crack propagation in the FE models.
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Article info
Publication history
Published online: June 29, 2022
Footnotes
Supported in part by the Research Fund for Postgraduate Students of the Faculty of Dentistry, Chiang Mai University.
Identification
Copyright
© 2022 by the Editorial Council for The Journal of Prosthetic Dentistry.
