DHYG 127/129 Exam 2 Question and answers 100%
correct 2026/2027
1. Adhesion of dental materials to enamel hap-
Acid etch pens by?
2. What is a smear layer? when dentin is cut or prepared by
dental instrument a layer of
"debris" is produced on the
surface
3. What is a liner? relatively thin layer of material
painted on to protect the
underlying dentin from chemical
irritation
4. Does dentinal bonding depend on more dependent on mechanical
mechan-ical bonding or chemical bonding of materials vs chemical
bonding? bonding
5. A strong bond to dentin requires what? hybrid layer and this hybrid layer
forma-
tion helps create a strong bond to dentin
6. What is percolation? opening and closing of the gap
between tooth structure and a
restoration due to ditterences in
coeflcients of thermal ex-pansion
7. If percolation occurs, what can happen? Microleakage, tooth sensitivity,
recurrent
decay
8. The matrix of a dental composite is a . polymer
9. Macrofilled Larger sized filler particles.
-restoration will feel rough
1/
13
, -restoration can appear rough
-plaque accumulation and staining is
greater with this
10. Microfiled
2/
13
correct 2026/2027
1. Adhesion of dental materials to enamel hap-
Acid etch pens by?
2. What is a smear layer? when dentin is cut or prepared by
dental instrument a layer of
"debris" is produced on the
surface
3. What is a liner? relatively thin layer of material
painted on to protect the
underlying dentin from chemical
irritation
4. Does dentinal bonding depend on more dependent on mechanical
mechan-ical bonding or chemical bonding of materials vs chemical
bonding? bonding
5. A strong bond to dentin requires what? hybrid layer and this hybrid layer
forma-
tion helps create a strong bond to dentin
6. What is percolation? opening and closing of the gap
between tooth structure and a
restoration due to ditterences in
coeflcients of thermal ex-pansion
7. If percolation occurs, what can happen? Microleakage, tooth sensitivity,
recurrent
decay
8. The matrix of a dental composite is a . polymer
9. Macrofilled Larger sized filler particles.
-restoration will feel rough
1/
13
, -restoration can appear rough
-plaque accumulation and staining is
greater with this
10. Microfiled
2/
13
