Comparative evaluation of sealing ability and microstructure of MTA and Biodentine after exposure to different environments
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Abstract
Objectives
The aim of this
study was to evaluate the sealing ability and morphological
microstructure of Biodentine in comparison to ProRoot mineral trioxide
aggregate (MTA) after storage in an acidic environment.
Materials and methods
Biodentine and
ProRoot MTA were prepared and packed into the canal lumen of dentin
disks. Twenty specimens of each material were further randomly divided
into two groups according to the storage media: group A: materials with
saline as storage medium; group B: materials with citric acid buffered
at pH 5.4 as storage medium. The sealing ability was evaluated at 1, 3,
6, and 24 h and 1 or 3 months, using a fluid transport model for
quantitative analysis of endodontic microleakage. The morphological
microstructures of the materials were also evaluated using scanning
electron microscopy.
Results
During the first
24 h, MTA showed greater fluid transport values than Biodentine in both
environments. At the 3-month measurement, when the materials were stored
in saline, MTA showed greater ability to prevent fluid movement than
Biodentine (p < 0.0001).
However, when the materials were stored in an acidic environment, no
statistical significant difference was found after 3 months. After
storage in saline, both materials showed an uneven crystalline surface
with similar hexagonal crystals. The microstructure of Biodentine
changed after exposure to citric acid, showing a relatively smooth
surface with more spheroidal crystals.
Conclusions
The exposure to an
acidic environment, within the limits of this study, seems to result in
morphological changes of Biodentine in a different manner than MTA. MTA
shows good ability to prevent fluid movement over time, in both
environments. The ability of Biodentine to prevent fluid movement over
time was enhanced in the acidic environment.
Clinical relevance
The findings of the present study could imply that both materials are indicated for use in an acidic environment.
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