Direct Restorative Procedures

Question 1

Possess uniform specified minimum thickness for strength

Answer 1

Resistance form

Question 2

For maximum edge thickness at margin for amalgam

Answer 2

90 degree amalgam butt joint angle

Question 3

How does amalgam self seal

Answer 3

By corrosion products in the meantime needs varnish to protect pulp

Question 4

Polishing of amalgam is done

Answer 4

After 24 hours

Question 5

For which tooth pulpal and gingival floors prepared parallel to occlusal surface

Answer 5

Mandibular 1st premolar

Question 6

Internal angle of amalgam should be

Answer 6

Rounded

Question 7

How much is adequate thickness of amalgam

Answer 7

1.5-2.0 mm in areas of occlusal contact
0.5 mm in axial areas

Question 8

A beveled cavosurface margin will lead to

Answer 8

Fracture of thin amalgam

Question 9

Occlusal of posteriors, occlusal thirds of facial and lingual of molars, palatal of max molars

Answer 9

Class I

Question 10

Ideal cavity dimensions for class I amalgam

Answer 10

Depth: 1.5-2 mm
Width: 1.0-1.5 mm

Question 11

Width of marginal ridges should be atleast how much for class I restoration

Answer 11

1.5 mm in premolars
2mm in molars

Question 12

Mesial and distal cavity walls are prepared with slight occlusal divergence to

Answer 12

Ensure that proximal marginal ridges are not undermined

Question 13

Dentinal depth of axial walls in class II preparation

Answer 13

If in enamel 0.5-0.6 mm in dentin
If in cementum 0.7-0.8 mm in dentin

Question 14

Minimal proximal extension

Answer 14

0.5mm

Question 15

Proximal contact areas in posterior teeth are located

Answer 15

More buccally

Question 16

In class II amalgam preparation 90 degrees cavosurface margin achieved by

Answer 16

Reverse curve on buccal

Question 17

Primary retention form in class II cavity preparation achieved to prevent restoration getting dislodged proximally is by

Answer 17

Dovetail

Question 18

All external walls are prepared perpendicular to the external tooth surface in

Answer 18

Class V amalgam preparation

Question 19

Retention achieved in class V amalgam restoration by

Answer 19

Two retention grooves
One of gingivoaxial and one on occlusoaxial

Question 20

What are the 3 types of retentive pins

Answer 20

Cemented, self threading, friction locked

Question 21

What is the most common type of retentive pin

Answer 21

Self threading

Question 22

Retentive pin holes depth and diameter

Answer 22

Depth: 1.3-2 mm ideally 2 mm
Diameter
0.04-0.1 mm smaller than diameter of pin

Question 23

What permits the insertion of threaded pin into a hole of smaller diameter

Answer 23

Elasticity of dentin

Question 24

Occlusal clearance for retentive pin

Answer 24

Should be sufficient to provide 2 mm of amalgam over the pin

Question 25

What is done to reduce polymerization shrinkage in composite

Answer 25

2mm increment curing

Question 26

Retention in composite is obtained by

Answer 26

Micromechanical retention by bonding

Question 27

Composite bonds more reliably to

Answer 27

Enamel

Question 28

To reduce polymerization shrinkage of composite in proximal boxes

Answer 28

Oblique increments

Question 29

Darker shades of composite

Answer 29

Dark or opaque require increased curing time

Question 30

For class III which approach is preferable

Answer 30

Lingual approach

Question 31

Where can you leave unsupported enamel?

Answer 31

In non occlusal stress areas like class III

Question 32

Extra retention can be achieved in class III by

Answer 32

Grooves or adding bevel

Question 33

Bevel in class III composite can be

Answer 33

At 45 degrees For esthetic purposes

Question 34

For class IV composite restoration retention by

Answer 34

Retention groove Enamel bevel to increased in width

Question 35

Width of the bevel for composite restoration

Answer 35

0.5-2mm

Question 36

When do you not use composite for class V preparation

Answer 36

Defects involving root surface for chemical adherence Decreased salivary function or lack of pt motivation for fluoride release

Question 37

Enamel bevels for class V

Answer 37

Placed on occlusal margin but not on gingival margin

Question 38

Acid etching of enamel

Answer 38

-Increases surface area -Increases surface free energy -37% phosphoric acid for 15 secs

Question 39

How does bonding work on enamel

Answer 39

Creates resin microtags in enamel for adhesion

Question 40

Organic and inorganic debris resulting from tooth preparation

Answer 40

Smear layer

Question 41

Removes smear layer and demineralizes calcified tissue

Answer 41

Acid etchant

Question 42

What happens to dentinal tubules after etching

Answer 42

Fluid in dentinal tubules exit out on enamel which is hydrophilic and bond is hydrophobic so primer helps with this

Question 43

What does etching do to dentinal surface

Answer 43

Recuces surface energy so primer will increase surface energy

Question 44

When primer and bonding agents applied to etched dentin they penetrate

Answer 44

Intertubular dentin to create hybrid layer Open dentinal tubules forming resin tags

Question 45

Dentin close to pulp has less predictable bonding because

Answer 45

Wider dentinal tubules so less hybrid layer formation