Biological Reactions

Question 1

Why is the dentinopulpal organ called as such despite the dentin and pulp having different structures?

Answer 1

They react to any stimulus as a one functional unit

Question 2

Any irritation to the odontoblasts, leads to the formation of:

Answer 2

Tertiary dentin (over 4–6 weeks)

Question 3

Reactionary dentin is secreted by:

Answer 3

Existing odontoblasts

Question 4

Reparative dentin is secreted by:

Answer 4

Newly formed odontoblastoid cells

Question 5

Reactionary dentin is delineated from the pulp by the:

Answer 5

Calcio-traumatic line

Question 6

Which type of cutting instruments shows better biological properties?

Answer 6

Hand cutting instruments

Question 7

Dentin is a thermal:

Answer 7

Insulator

Question 8

Dentin’s thermal insulating capacity’s range:

Answer 8

Between 85° F and 130°F (29.4º C - 54.4º C)

Question 9

Rebound response for bur application appears microscopically as:

Answer 9

Necrosis

Question 10

Pathological exposure of the pulp during cavity preparation occurs during:

Answer 10

Excavation of carious dentin

Question 11

The depth of the cavity in dentin and enamel is defined as:

Answer 11

Actual cavity depth

Question 12

The thickness in a dentin bridge separating the pulp from the floor of the cavity refers to:

Answer 12

Clinical cavity depth

Question 13

The distance along the wavy course of the dentinal tubules between the pulp and the floor of the cavity

Answer 13

Effective cavity depth

Question 14

The most accurate study of the pulp response is by determining the:

Answer 14

Effective cavity depth

Question 15

Which material is indicated to line deep cavities where the remaining dentin bridge is less than 0.5-mm?

Answer 15

Calcium hydroxide (pulp capping material)

Question 16

Which material is used as a base under metallic restorations?

Answer 16

Zinc phosphate cement

Question 17

When does amalgam show marginal seal development?

Answer 17

Within 12 weeks

Question 18

The biocompatibility of amalgams is due to the:

Answer 18

Release of corrosion products which block marginal gaps

Question 19

GIC can be considered biocompatible as:

Answer 19

It is anticariogenic due to fluoride release

Question 20

Which is the only dental material that if carefully placed and finished can approximate the cavosurface margin with zero marginal gap & good marginal seal and last longer than any other dental material?

Answer 20

Gold (direct restoration)

Question 21

Ceramic restorative materials are not known to cause any biological reactions, except for:

Answer 21

Wear to the opposing tooth/restoration

Question 22

Nearly all composites shrink from:

Answer 22

0.6–1.4%

Question 23

Which dental impression material shows no inflammatory response?

Answer 23

Addition silicone

Question 24

All cements are soluble except:

Answer 24

Resin cement

Question 25

The three major post-operative problems:

Answer 25

1- Post-operative sensitivity
2- Pulpitis
3- Secondary caries

Question 26

Faulty axial inclination causes:

Answer 26

Stress on periodontal ligament

Question 27

How to overcome improper buccal and lingual contour & axial inclination?

Answer 27

Proper matricing or double-matricing

Question 28

In a deep amalgam cavity, which base should be placed?

Answer 28

Cement

Question 29

In a moderate amalgam cavity, what should be placed?

Answer 29

Varnish