5. Bonding Agents and Mechanisms Flashcards
Why adhesive dentistry?
Tooth colored materials for more ____ restorations More ____ because you don’t need to create very retentive cavity preps
Less ____ consuming since you don’t need to spend as much time prepping the cavity
esthetic
conservation
time
Adhesive dentistry: a branch of dentistry which deals with ____ or bonding to the natural substance of teeth, ____ and ____.
adhesion
enamel
dentin
Important problem in restorative dentistry
\_\_\_\_ bonding of materials to dental hard tissues
This is a problem, especially with ____ restorations (amalgam, inlays, onlays, gold). There isn’t any bond between restorative materials and ____ or ____
weak
metallic
dentin
enamel
New adhesive restorative materials
bonding between cavity walls and restorative material, then restoration-cavity integration
With the help of new adhesive restorative materials, it is possible to create a bond between tissues like ____ and ____ and ____ material. That’s why adhesive dentistry is very important.
enamel
dentin
restroative
In operative dentistry, we create an adhesive restoration after bonding with the tooth tissues. Adhesive restorations are composed of two parts: \_\_\_\_ resin material (which is like amalgam, at the top of the cavity prep) \_\_\_\_ agent (\_\_\_\_ material we use to stick composite material to enamel and dentin)
composite
adhesive bonding
liquid
Bonding Agents
Bonding agents are ____ materials used to make a dental composite filling material to stick to both ____ and ____.
They can be defined as material of ____ viscosity, when applied on the tooth surface, forms a thin film layer after setting
It’s difficult to see this bonding agent, but when we apply it to dentin or enamel surfaces, it leaves a ____ surface on
the dentin or enamel, this is the only way we can see that we applied a bonding agent.
resin dentin enamel low shiny
Bonding of resin materials: adhesion
A complex phenomenon involving ____ and ____ mechanism that allows attachment of one material to another and proper sealing.
The bonding between adhesive material (composite) and the tooth surface is obtained by means of adhesion. ____: used to bond composite material to dentin or enamel. Reads slide.
chemical
mechanical
adhesion
Mechanical means of adhesion
- bonding occurs because of penetration of one material into another at the ____ level
- for example, in composite resins the bonding involves the penetration of ____ into enamel and dentin and formation of ____
Mechanical means of adhesion: occur when one material penetrates into another material
microscopic
resin
resin tags
Chemical means of adhesion
Adhesion promotors-coupling agents: ____, NPG-GMA, HEMA, ____
Chemical means of adhesion: adhesion promoters or coupling agents in the ____ bonding material. Especially nowadays, different bonding materials use different ____ agents for chemical bonding with the tooth tissue.
MDP: currently the main material used in different ____ agents, different adhesive materials; it is a ____ that bon to ____ of dentin and enamel. Almost all of the companies use this monomer now that the patent has expired
4-META
MDP
adhesive
coupling
bonding
monomer
hydroxyapatite
For a good adhesion
Without bonding agents, we cannot get a good bond with the tooth surface. We need this glue! There are different bonding agents on the market, Dr. Ozer will explain the main groups of bonding agents to you later.
YAY
Concept of a dentin bonding agent:
Bonding agents bond both dentin and enamel and also to composite, it should bond both sides.
Bonding agents usually have two parts in their chemical composition. The ____ part bonds dentin because dentin has some dentinal liquid in the dental tubules, it’s not a very dry surface.
The ____ part bonds to composite. These two parts need to work in an accordance in a very strong integral mechanism
hydrophilic
hydrophobic
Steps in forming good ahdesion
(1) clean ____
A clean, uncontaminated tooth surface
(2) good ____
…of the surface with the bonding agent - needs to be viscous enough to seal, to wet the surface.
(3) intimate ____
…with the bonding surface
(4) ____
…with the surface by mechanical and chemical means of adhesion/bonding
with the dentin surface
(5) good ____
adherend wetting adaptation bonding curing
Bonding to Enamel
Enamel bonding is a bit easier and more simple to achieve.
In 1955, Dr. Buonocore acid etched the enamel surface for the first time and introduced the acid etch technique to the dental field.
We create a porous, irregular surface that is invaded by the bonding agent. It is ____ of the surface.
To get good adhesion, we need to bond enamel and dentin, but they have different structures. Enamel bonding is different from dentin bonding. Enamel is a very hard tissue with almost ____% inorganic hydroxyapatite structure.
When we acid etch the enamel surface, we create a porous, irregular surface because the strong acid (____ acid) creates a porous surface on enamel according to whether the surface is an uncut or cut enamel surface.
Acid etching creates a very small tiny porous surface in the center of enamel rods and around the enamel rods, we create a big ____. Then, bonding agent infiltrates in these micro and macro gap areas around or inside of enamel rods, and makes ____ or macrotags, these are kind of interlocking with the enamel.
interlocking
90
orthophosphoric
microgap
microtags
How about dentin Tubules from pulp to DEJ: larger and numerous near pulp \_\_\_\_ extensions Fluid movement dictated by \_\_\_\_ Covered with \_\_\_\_ layer Contains a strong \_\_\_\_ matrix
Dentin is not like enamel, it’s made of inorganic hydroxyapatite crystals too, but it’s mainly ____ by it’s chemical composition.
Dentin has ____ with dentinal fluid. When we cut the dentin surface we create a ____ layer on the surface (unlike enamel, which has a clean surface with no extra layer when you cut it). Dentin has a very strong collagen network. It has collagen fibers, that’s why dentinal bonding is different from enamel bonding.
odontoblastic
pulp
smear
collagen
tubules
smear
Smear layer
This is a debris left on the surface after cutting, consists of ____ and altered denatured ____ which fill the orifices of the tubules
Sometimes this debris also creates a ____ plug in the dentin tubules, which is not good because it prevents us from getting into the dentin ____.
hydroxyapatite
collagen
smear
tubules