biodentine Flashcards
biodentine developed by whom and why
developed by septodent
formulated using the active biosilicate technology with improvement on some properties, such as physical qualities and handling
properties of biodentine
biocompatibility
good technical properties
bioactive behaviour
dentine loss
affects the integrity of the tooth
has to be replaced by artificial material that restores physiological function and integrity of the tooth
towards preservation and protection of pulp; interest geared also toward regeneration of tooth structure
what is biodentine
tracalcium silicate based inorganic restorative material advertised as bioactive dentine substitute
composition
comprised of a powder and liquid component
powder composition
tri-calcium silicate - main core material
di-calcium silicate - second core material
calcium carbonate and oxide - filler
iron oxide - shade
zirconium oxide - radio pacifier
liquid composition
calcium chloride - accelerator
hydrosoluable polymer - water reducing agent
manipulation
The powder in the capsule is mixed with the liquid.
The capsule is then placed on a triturator for 30 sec.
The mixed Biodentine is then applied with the use of an
amalgam carrier or other carrier.
Biodentine™ working time is up to 6 minutes with a final set at
around 10-12 minutes.
This represents a great improvement compared to the other
calcium silicate dental materials (MTA), which set in more than 2
hours.
setting reaction
Calcium silicate interacts with water leading to the setting and
hardening of the cement.
Hydration of the tricalcium silicate (3CaO.SiO2 = C3S)
produces a hydrated calcium silicate gel (CSH gel) and
calcium hydroxide (Ca (OH)2).
setting of biodentine
Unreacted tricalcium silicate grains are surrounded by layers of calcium
silicate hydrated gel.
This gel (CSH) is relatively impermeable to water and slows down the
effects of further reactions (good seal).
CSH gel formation is due to the permanent hydration of the tricalcium
silicate which gradually fills in the spaces between the tricalcium silicate
grains.
The hardening process results from formation of crystals deposited in a
supersaturated solution.
applications of biodentine
dentine substitute
a direct pulp capping
an indirect pulp capping
temporary filling
as an endodontic repair material: perforation, specification, resorption
advantages of biodontine
better handling and manipulation characteristics
reduced setting time
replaces natural dentine with material having similar mechanical properties
assists in the remineralisation of dentine
preservation of pulp vitality and promotes pulp healing
for crown and root indications
disadvantages of biodentine
not as stable as composite material - thus not suitable as permanent enamel replacement
for this reason can only be used as a temporary filling material
inevitable waste of material as very small quantities used for endodontic application
biodentine mechanical properties
Adhesion: micromechanical anchoring and ion exchange.
Density: hydrosoluble polymer lowers water content which
increases density of Biodentine.
Porosity: lower in Biodentine which results in better mechanical
properties/strength.
Radiopacity: the zirconium oxide confers radiopacity to Biodentine.
Compressive strength of Biodentine continues to improve until it
reaches 300 MPa in about a month (natural dentine 297 MPa).
Microhardness: improves with time and in about a month it is in
same range as that of natural dentine.
biodentine properties continued
Antibacterial: the resulting Ca(OH)2 is responsible for high pH (12)
and the antibacterial activity.
Ion release: has the ability to release calcium and hydroxyl ions
which assist in dentine mineralization and dentine bridge formation.
Stability in Oral environment: not as stable as composite
materials but it is stable enough to be used as temporary filling
material.
Resistance to microleakage and erosion: the deposition of
apatite like calcium phosphate crystals at interface of hard tissue
and Biodentine increases resistance to microleakage (good seal).
