4)Adhesion Mechanism and Principles

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Questions and Answers

What is the primary mechanism of adhesion between an adhesive and an adherend?

Diffusion of polymer chains across the interface
Adsorption through chemical bonding (correct)
Electrostatic attraction due to electrical double layers
Mechanical interlocking

Which type of adhesion involves the interlocking of the adhesive with irregularities on the surface of the adherend?

Adsorption adhesion
Chemical bonding
Diffusion adhesion
Mechanical adhesion (correct)

What is the weakest type of bonding involved in adhesion?

Physical bonding (correct)
Covalent bonding
Ionic bonding
Hydrogen bonding

Which type of adhesion involves the interlocking of mobile molecules across an interface?

Diffusion adhesion (D) Signup and view all the answers

In which type of adhesion does an electrical double layer contribute to the bonding mechanism?

Electrostatic adhesion (C) Signup and view all the answers

What type of bonding is involved when surfaces are smooth and there is no chemical interaction between the adhesive and adherend?

Physical bonding (B) Signup and view all the answers

What is the purpose of resin tags formed in the enamel tissue?

To increase the surface area for mechanical interlocking (A) Signup and view all the answers

What is the difference between macrotags and microtags in the enamel tissue?

Macrotags form between the enamel rod peripheries, while microtags form across the end of each rod (A) Signup and view all the answers

What is the purpose of etching the enamel and dentin tissues?

To remove the smear layer and create a rough surface for better adhesion (D) Signup and view all the answers

What is the purpose of the smear layer on the cut surfaces of enamel and dentin?

To block the entrance of the dentinal tubules (B) Signup and view all the answers

What is the difference between the Type I, Type II, and Type III etching patterns on the enamel tissue?

Type I etches the prism cores, Type II etches the prism peripheries, and Type III etches both the cores and peripheries (A) Signup and view all the answers

What is the relationship between the dentinal tubules and the odontoblastic processes in the dentin tissue?

The dentinal tubules contain the odontoblastic processes (B) Signup and view all the answers

What is the primary basis of dental adhesion?

Mechanical bonding (C) Signup and view all the answers

What is the ideal contact angle for good wetting of a surface?

0 degrees (C) Signup and view all the answers

What property of an adhesive is important for it to be effective?

Low viscosity (C) Signup and view all the answers

What process increases the surface free energy of enamel, aiding adhesion?

Etching with phosphoric acid (A) Signup and view all the answers

What is the purpose of etching enamel with phosphoric acid?

To remove the prismatic and inter-prismatic mineral crystallites (B) Signup and view all the answers

What is the mechanism by which resin-based materials adhere to etched enamel?

Capillary action (C) Signup and view all the answers

What is the primary purpose of dentin etching?

To expose the intertubular and peritubular collagen (B) Signup and view all the answers

What factor influences the depth of dentin demineralization during etching?

Both the acid type and application time (C) Signup and view all the answers

What is the recommended procedure for drying dentin tissue before bonding?

Re-wetting after air-drying (A) Signup and view all the answers

What type of dentin is more resistant to etching and may result in less penetration of adhesive resin?

Sclerotic dentin (A) Signup and view all the answers

What happens to the peritubular dentin in sclerotic dentin?

It becomes wider and gradually fills the tubules (C) Signup and view all the answers

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