Abstract
Statement of problem
The preparation design and fabrication materials directly affect the clinical success
of endocrown restorations, and yet, knowledge is lacking about the biomechanical impact
of specific designs or materials on endocrown restorations.
Purpose
The purpose of this in vitro and finite element analysis study was to evaluate the
biomechanical behavior of endocrown restorations.
Material and methods
A total of 36 freshly extracted mandibular first molars were collected. The teeth
were prepared as per 2 different preparation geometries: with the buccal wall intact
(Class 2) and without the buccal wall (Class 3). Teeth were restored with endocrowns
made from 3 different fabricating materials, Vita Enamic, GC Cerasmart, and Lava Ultimate.
To analyze the in vitro fracture strength, cemented endocrowns were loaded in a universal
test machine with a 200-N oblique force until the restoration fractured. Finite element
analysis was used to evaluate the stress distribution on both the dentin tissue and
the restorative materials. The data were analyzed with a 2-way ANOVA test and the
Tukey post hoc test (α=.05).
Results
No significant differences were found between the different preparation designs (Class
2 and Class 3) on fracture strength (P>.05). The highest mean ±standard deviation fracture strength values were found in
the Lava Ultimate material (Class 2, 606.20 ±293; Class 3, 659.40 ±226 N) (P>.05), but the lowest fracture strength test values were obtained in the Vita Enamic
material (Class 2, 439.60 ±136; Class 3, 340 ±98 N) (P>.05) for both preparation design test groups.
Conclusions
A statistically significant difference was not found between the 2 tooth preparation
classifications. However, significant differences were observed among the test groups
in the Class 2 preparation specimens. The Class 2 preparation design exhibited a higher
number of irreparable failures.
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Article info
Publication history
Published online: July 28, 2021
Footnotes
Supported by grant no. PYO.DIS.1904.18.012 from the Ondokuz Mayis University Coordination of Scientific Research Projects.
Ç.U. equally contributed to this work.
Identification
Copyright
© 2021 by the Editorial Council for the Journal of Prosthetic Dentistry.
