Adhesion

Question 1

Fundamental Steps of Adhesion

Answer 1

etch
prime
bond

Question 2

the inward attractive forces of the molecule of a liquid or a solid.

Answer 2

Surface energy

Question 3

The surface energy of a liquid is
known as the

Answer 3

surface tension

Question 4

For an adhesive to flow easily over a treated surface, the surface should possess a surface energy ……. than the critical surface tension of the adhesive?

Answer 4

higher

Question 5

upon etching enamel surface energy ……?

Answer 5

increase

Question 6

upon etching dentin surface energy ……?

Answer 6

decrease

Question 7

Ideal Adhesive infiltration

Answer 7

Low contact angle
High wettability
High Surface energy

Question 8

fundamental mechanism of resin-enamel adhesion

Answer 8

The formation of resin microtags within the enamel surface

Question 9

enamel must be …. and …. during acid etching

Answer 9

dry and clean to avoid contamination

Question 10

the intertubular dentin, forming a resin–dentin interdiffusion zone where the adhesive and dentin interlock

Answer 10

hybird layer

Question 11

the passage of bacteria and their toxins between restoration margins and tooth preparation walls.

Answer 11

microleackage

Question 12

small porosities in the hybrid layer or at the transition between the hybrid layer and the mineralized dentin.

Answer 12

nanoleackage

Question 13

First Generation adhesive

Answer 13

Dentin bond strength of this material is in the range of only 2 to 3 MPa.

Question 14

Second Generation adhesive

Answer 14

Its mechanism of action was based on the polar interaction

Dentin bond strength of this material is in the range1 to 5 MPa.

Question 15

Third Generation adhesive

Answer 15

• Primers with hydrophilic and hydrophobic components introduced
• The smear layer was either removed or modified
• Bond strength 10 MPa

Question 16

Fourth Generation adhesive

Answer 16

as three-step etch-and-rinse systems:
(1) a phosphoric acid–etching gel that is rinsed off;
(2) a primer;
(3) unfilled or filled resin bonding agent.

Question 17

Fifth Generation adhesive

Answer 17

• Two step etch and rinse system: (1) A phosphoric acid–etching gel that is rinsed off;
  (2) A primer/adhesive.

Question 18

Sixth Generation adhesive

Answer 18

• Two step self-etch adhesive system
  (1) Mild etchant/primer (no rinsing).
  (2) Adhesive -Self etch adhesive

systems are less reliable than etch and rinse techniques.

Question 19

Seventh Generation adhesive

Answer 19

One step self-etch adhesive system
(1) Mild etchant/primer/ adhesive (no rinsing).