Abstract
Statement of problem
Marginal fit of zirconia restorations is an important criterion for their long-term
success. However, in spite of the wide use of zirconia in dentistry, the relationship
between marginal fit and low-temperature degradation from aging is unclear.
Purpose
The purpose of this in vitro study was to compare the marginal adaptation of veneered
and monolithic zirconia and metal-ceramic computer-aided design and computer-aided
manufacturing (CAD-CAM) crowns before and after cementation and to evaluate the influence
of artificial aging on the adaptation of zirconia crowns.
Material and methods
Seventy-two standardized dies were prepared to receive a posterior crown and randomly
divided into 6 groups (n=12) as per the material and the presence or not of cement:
metal-ceramic, veneered zirconia, and monolithic zirconia. The zirconia groups were
subjected to accelerated low-temperature degradation through hydrothermal aging in
an autoclave at 131 °C and 0.17 MPa for 5 and 20 hours. A scanning electron microscope with
a magnification of ×1000 was used for marginal adaptation measurements, and X-ray
diffraction (XRD) was used to characterize phase transformation degradation. The data
were statistically analyzed using 2-way ANOVA, repeated measures ANOVA with Greenhouse-Geisser
correction, and the t test (α=.05).
Results
No significant differences in the marginal discrepancy were recorded among the analyzed
groups. The presence of cement did not influence marginal fit in any treatment group.
No significant differences were observed in the marginal adaptation values before
and after aging (P>.05). After 20 hours of aging, the monoclinic phase increase to 8.3% on veneered
zirconia and to 3.1% on monolithic crowns.
Conclusions
Monolithic and bilayer CAD-CAM zirconia crowns showed marginal gaps that were within
an acceptable range of clinical discrepancy, regardless of cementation. Marginal adaptation
was not influenced by aging. Low-temperature degradation did not lead to a significant
transformation from the tetragonal to monoclinic phase.
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Article info
Publication history
Published online: November 08, 2020
Footnotes
Supported provided in part by a research grant between the University Complutense of Madrid and AVINENT Implant System SL. (No. 322-2014), through the last author.
Identification
Copyright
© 2020 by the Editorial Council for the Journal of Prosthetic Dentistry.
