Abstract
Statement of problem
Monolithic restorations facilitate computer-aided design and computer-aided manufacturing
(CAD-CAM) processability and provide thin-walled restorations, which require less
tooth reduction. For the long-term success of these restorations, their durable sealing
is important. However, data in this regard are sparse.
Purpose
The purpose of this in vitro study was to investigate the microleakage of monolithic
complete crowns made from current CAD-CAM materials after mastication simulation.
Material and methods
Sixty-four identical test specimens (crown and tooth) were milled based on corresponding
standard tessellation language data sets: one for the crowns and another for the human
molar teeth. Four CAD-CAM restoration materials were investigated: 2 polymer-containing
materials, Brilliant Crios (BC) and Vita Enamic (VE), and 2 zirconia materials, ultra-high-translucent
Nacera Pearl Q³ Multi-Shade (ultraHT) and high-translucent Nacera Pearl Multi-Shade
(HT). The crowns were adhesively luted to the CAD-CAM milled human molars with 1 of
3 luting systems: OneCoat7Universal and DuoCem (BC); A.R.T.Bond and DuoCement (VE);
or EDPrimer/Panavia F2.0 (ultraHT and HT). The specimens were divided in 2 subgroups,
and 2 different mastication simulations were applied: normal function (NF) and bruxism
(B). A dye penetration test was used to detect microleakage, and the specimens were
sectioned. A digital microscope (Zeiss) was used for analysis and to calculate the
percentage of leakage in relation to the height of the tooth. Data were subjected
to the Mann-Whitney and Kruskal-Wallis tests (α=.05).
Results
Microleakage was identified in all groups. VE reported the highest leakage with a
mean of 13.0%, followed by ultraHT (4.8%), HT (3.6%), and BC (3.0%). No significant
difference was detected between the 2 simulation programs (normal function and bruxism).
However, VE and the zirconia group HT exhibited a significant difference (P<.014), whereas no significant difference was noted among the zirconia groups or the
polymer-containing groups BC and VE.
Conclusions
Thin-walled restorations made of CAD-CAM composite resin and zirconia exhibited reduced
microleakage compared with the polymer-containing ceramic. Thus, from the specific
viewpoint of microleakage, CAD-CAM composite resins and zirconia seem to be suitable
materials for thin-walled complete crowns.
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Article info
Publication history
Published online: March 06, 2020
Identification
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© 2020 by the Editorial Council for The Journal of Prosthetic Dentistry.
