Original scientific paper
Influence of cavity design preparation on stress values in maxillary premolar: a finite element analysis
Ivana Kantardžić
; University of Novi Sad, Faculty of Medicine, School of Dentistry, Novi Sad, Serbia
Darko Vasiljević
; University of Belgrade, Institute of Physics, Belgrade, Serbia
Larisa Blažić
; University of Novi Sad, Faculty of Medicine, School of Dentistry, Vojvodina Clinic of Dentistry, Novi Sad, Serbia
Ognjan Lužanin
; University of Novi Sad, Faculty of Technical Sciences, Department of Production Engineering, Novi Sad, Serbia
Abstract
Aim To analyze the influence of cavity design preparation
on stress values in three-dimensional (3D) solid model of
maxillary premolar restored with resin composite.
Methods 3D solid model of maxillary second premolar
was designed using computed-tomography (CT) data.
Based on a factorial experiment, 9 different mesio-occlusal-
distal (MOD) cavity designs were simulated, with three
cavity wall thicknesses (1.5 mm, 2.25 mm, 3.0 mm), and
three cusp reduction procedures (without cusp reduction,
2.0 mm palatal cusp reduction, 2.0 mm palatal and buccal
cusp reduction). All MOD cavities were simulated with
direct resin composite restoration (Gradia Direct Posterior,
GC, Japan). Finite element analysis (FEA) was used to calculate
von Mises stress values.
Results The von Mises stresses in enamel, dentin, and
resin composite were 79.3-233.6 MPa, 26.0-32.9 MPa, and
180.2-252.2 MPa, respectively. Considering the influence of
cavity design parameters, cuspal reduction (92.97%) and
cavity wall thickness (3.06%) significantly (P < 0.05) determined
the magnitude of stress values in enamel. The influence
of cavity design parameters on stress values in dentin
and resin composite was not significant. When stresses for
enamel, dentine, and resin composite were considered all
together, palatal cusp coverage was revealed as an optimal
option. Cavity wall thickness did not show a significant effect
on stress values.
Conclusion Based on numerical simulations, a palatal cusp
reduction could be suggested for revealing lower stress
values in dental tissues and restorative material. This type
of cavity design should contribute to better biomechanical
behavior of tooth-restoration complex, consequently providing
the long-lasting clinical results.
Keywords
Hrčak ID:
95000
URI
Publication date:
15.12.2012.
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