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Surface Phenomena and Adhesion in Biomaterials

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Surface Phenomena and Adhesion in Biomaterials

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Questions and Answers

What happens when an adhesive bond is tested in tension?

One of three things may happen: adhesive failure, cohesive failure of the adhesive, or cohesive failure of the adherend (correct)

The adhesive junction always fails due to adhesive failure

Adhesive failure and cohesive failure of the adhesive occur simultaneously

The bond becomes stronger due to the increased tension

What is the effect of a thinner adhesive film on the adhesive junction?

It increases the number of air voids

It reduces the strength of the adhesive junction

It allows for more intimate contact and reduces thermal stresses (correct)

It has no effect on the adhesive junction

What type of bonds produce stronger adhesion?

Cohesive bonds within the adherend

Cohesive bonds within the adhesive

Primary bonds between adhesive and adherend (correct)

Secondary bonds between adhesive and adherend

Why does an adhesive that adheres to the organic component of enamel and dentin not adhere to the inorganic portion?

Because the adhesive is not compatible with the inorganic component (B) Signup and view all the answers

What is the effect of surface irregularities in the prepared cavity on adhesion?

It decreases the surface area for adhesion (C) Signup and view all the answers

What is the reason why materials that adhere to enamel may not adhere to dentin?

Because enamel and dentin have different compositions (D) Signup and view all the answers

What is the result of a soldered joint compared to a glued joint?

A soldered joint is stronger than a glued joint (C) Signup and view all the answers

What is the effect of a thicker adhesive film on the adhesive junction?

It reduces the strength of the adhesive junction (D) Signup and view all the answers

Why do dental considerations prevent ideal adhesion in the oral cavity?

Because of the inhomogeneous composition of enamel and dentin (B) Signup and view all the answers

What is the effect of setting contraction of the adhesive on the adhesive junction?

It reduces the strength of the adhesive junction (B) Signup and view all the answers