Download - Dental adhesives
FIG. 1
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FIG.2
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It is an innovative, modern
achievement of dentistry, which
allows aesthetic results, generally,
that previously could not be
achieved.
FIG.3
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Restorations with important
achievements:
Being able to adhere does not only resin,
but also structures ceramics to dental
tissue.
Aesthetic
Biological
Functional
Induction of oral fluid and bacteria in
microscopic fissures that exist between the
surface of the prepared tooth and the
restorative material
In amalgam: produces no continuity between
the two structures, but over time the interface is
sealed, since it produces corrosion products
that seal.
In ionomer: fluoride is released which
prevents recurrent caries.
In resins: the direct filling are inert, do not
produce marginal seal, therefore we must seek
other methods of achieving marginal seal.
Some may be polymerized only
with the components included
in its composition:
There are auto polymerizing,
self-curing, or chemical
activation.
FIG.5
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Others need a light
generating device to be
cured: they are the
photopolymerizable, light
photocurable or activation
(with light).
FIG. 4 Self-etching adhesive system
photocurable of a single
component for the dentin and the
enamel which releases fluoride.
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FIRST HYDROPHOBIC
SECOND MIXED
THIRD HYDROPHILIC
FOURT HYBRID LAYER
FIFTH SINGLE COMPONENTS
SIXTH ETCHING
SEVENTH ALL IN ONE
FIRST: Before 1980. Without conditioning on dentin. It had very low adhesion values in dentin: 2-7 MP, the enamel MP 24-27.
SECOND: 3 times greater adhesion to dentin and enamel 30-50%.
THIRD: They generate bond strength similar to that between enamel and resin. It was only trying to produce a chemical bond, subsequently obtained a micro mechanical junction, by forming an interdiffusion layer which leads to high levels of adhesion.
FOURTH: Adhesion greater than 20 MP
FIFTH: Based on hybridization dentin layer. Easier use than previous. Resistance similar to those of the fourth generation.
SIXTH: It begins to use primers etching and mixtures of adhesives with primers and phosphoric acid is removed except for the sound enamel.
SEVENTH: Among the improvements we can mention the self-etching adhesives and those which do not require mixing.
MECHANICAL OR PHYSICAL
Exclusively for one mechanical locking.
It is based on morphological features of
the parts (Grasp) and may be at levels:
Macromechanic: undermined
Micromechanic: differs from the
previous one in the size of the parts.
Forces are generated between both parts. They
are interactions at atomic level or molecular,
based on primary joints (chemicals: ionic,
covalent, metal) and secondary (hydrogen
bridges and oscillating dipoles). The ideal is for
primary joints to be produced.
BIS.GMA Bisfenol-glicidil-metacrilato
HEMA 2 Hidroxidi-etil-metacrilato TEG.DMA Tri-etilen-glicol-glicidil-metacrilato
PEG.DMA Polietilen-glicol-dimetacrilato GPDM Gilcerol-propano-dimetacrilato
DMA Dimetacrilatos MMPAA Poliacidos-dimetacrilato-modificado
UDMA Dimetacrilato de Uretano HPMA Hidroxidi-propil-metacrilato
BPDM Bifenil-dimetacrilato 4-META 4-metacril-oxi-etil-trimelitato-anhibrido
PENTA Ester-fosfonato-penta-acrilato
Low service tension
Low Viscosity
Dimensional Stability
Adequate Mechanical Properties: to resist
forces of mastication
Hydro resistance
Biological Compatibility
High surface energy to attract the liquid
so that it can be drained. In order for
that, it is necessary for it to be clean with
a smooth surface (favors the chemical
union but not the mechanical). This is,
the surface must be wettable by the
adhesive.
FIG.4
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NAME COMMERCIAL
HOME
SOLVENT CURING TIME
TETRIC N
BOND
IVOCLAR
VIVADENT
ETHANOL 10 SEC.
PRIME &
BOND NT
DENTSPLY ACETONE 10 SEC.
ONE COAT
BOND SL
COLTENE WATER 30 SEC.
TE-ECONOM
BOND
IVOCLAR
VIVADENT
ETHANOL 20 SEC.
ADPER
SINGLE
BOND 2
3 M ETHANOL 10 SEC.
Retain most of the
tooth structure Achieve a lasting
and optimal
retention
Prevent
microleakage
Photopolymerizable (marginal percolation)
Auto curing
Dual, Auto or phtocuring
ADVANTAGES DISADVANTAGES Increase tooth retention and effort There is a greater chance of dentin
overmineralize
Higher marginal adaptation Need of long clinical time
Lower percentage of secondary
decay
Possibility of contaminating dental
structure
Decrease in sensitivity Major risk of over drying the dental
tissue or chance of moisture in the
substrate adherent
3M
Bisco
Kerr
Dentsply
Kuraray
Jeneric
Vivadent FIG: 5
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www.universodontologico.com.ar/pacientes/preguntas/adhesion.htm
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