Abstract
Statement of problem
How the polymerization shrinkage, loading, and mechanical properties of luting materials
affect the shrinkage and functional stresses in ceramic laminate veneers (CLVs) with
and without tooth preparation is unclear.
Purpose
The purpose of this finite element analysis (FEA) study was to evaluate the effect
of the polymerization shrinkage, functional loading, and mechanical properties of
different luting materials on the stresses in ultrathin 0.3-mm CLVs with and without
tooth preparation.
Material and methods
Three resin cements, RelyX Veneer (RV), Allcem Veneer APS (AV), Variolink Esthetic
LC (VE), and 1 flowable composite resin, Tetric N-Flow (TF), were tested for post-gel
shrinkage (Shr), Knoop hardness (KHN), elastic modulus (E), compressive strength (CS),
and diametral tensile strength (DTS). IPS e.max CAD disks of 0.3-mm thickness were
made for simulating the effects of light attenuation. Eight 2-dimensional finite element
models (Marc-Mentat) of a maxillary central incisor were generated to evaluate the
polymerization shrinkage stress of different materials for luting 0.3-mm CLVs with
or without tooth preparation and the stress during functional loading by using a modified
von Mises criterion (mvm). Collected data from Shr, KHN, and E were submitted to 2-way
ANOVA and the Tukey HSD test (α=.05).
Results
Light attenuation by the 0.3-mm ceramic disk did not significantly affect the E values,
but Shr was significantly lower in VE (26%) and TF (35%). TF had lower volumetric
Shr (%) when interposing a ceramic disk (0.31%). Both tested tooth preparation options
showed similar stress distributions from polymerization shrinkage or functional loading,
with higher stress concentration on the incisal edge and also on the cervical surface.
The model featuring tooth preparation and RV resin cement had the highest and VE the
lowest stress levels.
Conclusions
The flowable composite resin had similar mechanical properties as the resin cements.
The stress distribution from shrinkage and functional loading was similar for both
techniques with or without tooth preparation.
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Article info
Publication history
Published online: May 15, 2020
Footnotes
Supported by CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES Finance Code 001) (501100002322), CNPq (National Council of Scientific and Technological Development) (501100003593), and FAPEMIG (Foundation for Research Support of the State of Minas Gerais) (501100004901).
Identification
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© 2020 by the Editorial Council for The Journal of Prosthetic Dentistry.
