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Restorative > Direct Restorative Procedures > Flashcards

Direct Restorative Procedures Flashcards

1
Q

Possess uniform specified minimum thickness for strength

A

Resistance form

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2
Q

For maximum edge thickness at margin for amalgam

A

90 degree amalgam butt joint angle

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3
Q

How does amalgam self seal

A

By corrosion products in the meantime needs varnish to protect pulp

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4
Q

Polishing of amalgam is done

A

After 24 hours

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5
Q

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

A

Mandibular 1st premolar

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6
Q

Internal angle of amalgam should be

A

Rounded

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7
Q

How much is adequate thickness of amalgam

A

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

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8
Q

A beveled cavosurface margin will lead to

A

Fracture of thin amalgam

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9
Q

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

A

Class I

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10
Q

Ideal cavity dimensions for class I amalgam

A

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

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11
Q

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

A

1.5 mm in premolars
2mm in molars

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12
Q

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

A

Ensure that proximal marginal ridges are not undermined

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13
Q

Dentinal depth of axial walls in class II preparation

A

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

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14
Q

Minimal proximal extension

A

0.5mm

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15
Q

Proximal contact areas in posterior teeth are located

A

More buccally

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16
Q

In class II amalgam preparation 90 degrees cavosurface margin achieved by

A

Reverse curve on buccal

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17
Q

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

A

Dovetail

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18
Q

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

A

Class V amalgam preparation

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19
Q

Retention achieved in class V amalgam restoration by

A

Two retention grooves
One of gingivoaxial and one on occlusoaxial

20
Q

What are the 3 types of retentive pins

A

Cemented, self threading, friction locked

21
Q

What is the most common type of retentive pin

A

Self threading

22
Q

Retentive pin holes depth and diameter

A

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

23
Q

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

A

Elasticity of dentin

24
Q

Occlusal clearance for retentive pin

A

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

25
Q

What is done to reduce polymerization shrinkage in composite

A

2mm increment curing

26
Q

Retention in composite is obtained by

A

Micromechanical retention by bonding

27
Q

Composite bonds more reliably to

A

Enamel

28
Q

To reduce polymerization shrinkage of composite in proximal boxes

A

Oblique increments

29
Q

Darker shades of composite

A

Dark or opaque require increased curing time

30
Q

For class III which approach is preferable

A

Lingual approach

31
Q

Where can you leave unsupported enamel?

A

In non occlusal stress areas like class III

32
Q

Extra retention can be achieved in class III by

A

Grooves or adding bevel

33
Q

Bevel in class III composite can be

A

At 45 degrees
For esthetic purposes

34
Q

For class IV composite restoration retention by

A

Retention groove
Enamel bevel to increased in width

35
Q

Width of the bevel for composite restoration

A

0.5-2mm

36
Q

When do you not use composite for class V preparation

A

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

37
Q

Enamel bevels for class V

A

Placed on occlusal margin but not on gingival margin

38
Q

Acid etching of enamel

A

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

39
Q

How does bonding work on enamel

A

Creates resin microtags in enamel for adhesion

40
Q

Organic and inorganic debris resulting from tooth preparation

A

Smear layer

41
Q

Removes smear layer and demineralizes calcified tissue

A

Acid etchant

42
Q

What happens to dentinal tubules after etching

A

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

43
Q

What does etching do to dentinal surface

A

Recuces surface energy so primer will increase surface energy

44
Q

When primer and bonding agents applied to etched dentin they penetrate

A

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

45
Q

Dentin close to pulp has less predictable bonding because

A

Wider dentinal tubules so less hybrid layer formation

Restorative (4 decks)

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