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Chemical Adhesion in Dentistry Quiz

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Questions and Answers

What is the relationship between contact angle and adhesion forces?

Contact angle must be zero or less than 90° for strong adhesion between adherend and adhesive (correct)

Contact angle must be greater than 45° for strong adhesion between adherend and adhesive

Contact angle has no effect on the adhesion forces between adherend and adhesive

Contact angle must be greater than 90° for strong adhesion between adherend and adhesive

What is the primary cause of surface energy in solids?

Increased surface area of the solid

Unequal attraction of the outermost atoms in all directions (correct)

Increased impurities in the solid

Increased temperature of the solid

How does temperature affect the surface tension of liquids?

Temperature has no effect on surface tension

Surface tension increases with temperature up to a certain point, then decreases

Increasing temperature decreases surface tension (correct)

Increasing temperature increases surface tension

What is the primary way that liquids try to decrease their surface tension?

By minimizing their surface area Signup and view all the answers

How does the surface energy of the adherend (solid surface) affect wettability?

Increasing the surface energy of the adherend increases wettability Signup and view all the answers

What is the primary reason for the increased surface energy in solids compared to the interior?

The outermost atoms in solids are not equally attracted in all directions Signup and view all the answers

How does the surface tension of the adhesive affect wettability?

Increasing the surface tension of the adhesive decreases wettability Signup and view all the answers

What is the primary way that solids try to reduce their surface energy?

By adsorbing atoms or molecules onto their surface Signup and view all the answers

How does the surface tension of liquids differ from the surface energy of solids?

Surface tension is a property of liquids, while surface energy is a property of solids Signup and view all the answers

What is the relationship between surface energy, surface area, and adhesion in solids?

Increasing the surface area of a solid increases its surface energy, which increases adhesion Signup and view all the answers