Biodentine

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The quality and durability of the interface is a key factor for the survival of a restoration
material in clinical conditions: the marginal adaptation and the intimate contact with the
surrounding materials (dentine, enamel, composites and other dental materials) are
determinative features. This was investigated by erosion in acid solutions, electron
microscopy and microleakage tests.
In the case of Biodentine, the dissolution/precipitation process, which is inherent to
the setting principle of Calcium silicate cements, will differentiate its interfacial behaviour
from the already known dental materials (composites, adhesives, glass ionomers).
3.1 - Resistance to acid
Concerning durability of water based cements, in the oral cavity; one of relevant
characteristics of the dental materials is the resistance to acidic environment. It is known
that glass ionomers have a tendency to erode under such conditions.
The acid erosion and the effects of aging in artificial saliva on the Biodentine structure
and composition were investigated (Laurent et al., 2008).
Methods:
The acid erosion test was evaluated daily in lactic acid (0.02M) and sodium lactate (0.1M)
aqueous solution (pH 2.74), by measuring the height loss of the Biodentine samples
(2mm, diameter 30mm) for a week. Aging was evaluated in Meyer-modified Fusayama
artificial saliva containing phosphates (pH 5.3).
The height modification of the material was evaluated for a week. Scanning electron
microscopy was used to examine and characterise the surface of the sample before and
after Aging. The possible dissolution of the new material in the artificial saliva was
evaluated by measuring the concentration of Si, Ca, Zr, and inorganic carbonate in the
artificial saliva after 1, 2, 3 and 4 weeks.
Results :
Biodentine Interfaces
In the 2.74 pH solution, acid erosion is observed (Fig.4), but this erosion is slower than
with glass ionomer cement reported by Nomoto (Nomoto and McCabe, 2001).