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D1 Spring - Operative Dentistry I > 1/25: Class I and Class V Prep. Fundamentals > Flashcards

1/25: Class I and Class V Prep. Fundamentals Flashcards

1
Q

Having a means for isolation of the site does what three things?

A
  1. Visibility
  2. Access
  3. Moisture control (especially when restoring composite resin)
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2
Q

What are 4 principles of isolation?

A
  1. Rubber dam (gold standard)
  2. Retraction cord
  3. Cotton rolls
  4. Isovac
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3
Q

All undermined enamel must be ________ from all margins

A

Removed

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4
Q

What is undermined enamel?

A

Enamel that is not supported by dentin under it
*Dentin MUST be supported by all surface enamel

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5
Q

Margins should be ______ degrees at the cavosurface on all axial surfaces

A

90*

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6
Q

On the occlusal surface, margins may be slightly _______ in some areas, but must NEVER be ________ anywhere on the tooth

A

obtuse; acute
*enamel would break

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7
Q

Ideal preparations are ______ to _______ into the dentin

A

0.2mm to 0.5mm
*must prepare through the ENTIRE enamel layer
*in a live patient, this is determined by caries

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8
Q

A prep of 0.2mm to 0.5mm into the dentin means that?

A

Different depths in different places on the tooth
*it will depend on the thickness of the enamel in the area

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9
Q

What does retention form mean?

A

Holds a restoration in a tooth (RETAINS the restoration)

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10
Q

Amalgam doesn’t bond to _______

A

Tooth structure

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11
Q

Smaller amalgams are held in by _____________ if no walls can converge

A

Converging walls and/or by retention grooves

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12
Q

What are elements in the design of a tooth preparation that will help both restoration and tooth resist fracturing?

A

Resistance form

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13
Q

What makes the tooth less likely to fracture?

A
  1. Maintaining as much tooth structure as possible
  2. Rounding internal line angle on a preparation (a little bit)
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14
Q

Preparing to PROPER DEPTH prevents ___________ in the restoration

A

Weakness (resists fractures)
- NEVER leave enamel on the floor of an amalgam preparation
- NEVER leave a partial-depth ledge on the enamel wall of an occlusal preparation like a class I amalgam

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14
Q

Avoid leaving _________ under an amalgam that is subject to occlusal stress

A

Sharp external line angles
- This could result in fracture of the RESTORATION
ex: axial wall of class II prep

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14
Q

What makes a restoration less likely to fracture?

A
  1. Having some areas on the floor of a multi-surface preparation that are perpendicular to occlusal forces
  2. Smoothly rounding outline forms
14
Q

What classification is a buccal pit amalgam?

A

Class I
*NOT a class V desite being on axial surface

15
Q

Where does a class I buccal pit amalgam occur?

A

2/3 of molar tooth

16
Q

What does a class I buccal pit restoration restore?

A

Developmental pit

17
Q

The walls at the terminal ends of the buccal and lingual grooves ______ _______ degrees

A

Diverge 3 degrees

18
Q

Walls in the isthmus areas ___________ on each side of the preparation

A

Converge 3 degrees

19
Q

Isthmus width is _______ minimum

A

1mm

20
Q

Walls adjacent to marginal ridges ____________

A

Diverge 3 degrees

21
Q

_________ the mesial or distal wall adjacent to the marginal ridge leaves _________ for the ridge in this area

A

Diverging; dentin support

22
Q

What is the occlusal amalgam depth?

A

.2mm inside dentino-enamel junction
*plastic molars: 2mm total
*plastic premolars: 1.5mm total

23
Q

________ the wall adjacent to the marginal ridge risks ______________ for the marginal ridge

A

Converging; destruction of the dentin support

24
Q

What happens when wall converges where it should diverge?

A

Marginal ridge is weak

25
Q

What happens when wall diverges too much?

A

Amalgam at margin would be weak

26
Q

How do you avoid an off-axis preparation?

A

Enter teeth parallel to the long axis of the tooth crown not the patient

27
Q

Bur inclines more mesially in the ________ and more distally in the __________ the further posteriorly we go, due to the ____________

A

Mandible; maxilla; curve of spee

28
Q

Bur inclines more lingually in the ________ and more buccally in the __________ the further posteriorly we go, due to the ____________

A

Mandible; maxilla; curve of wilson

29
Q

What do angular outline form cause?

A

Areas of stress concentration, fracturing amlgam

30
Q

At ______mm of depth on an ordinary molar, the bur has/has not penetrated into dentin

A

1.5mm; has not

31
Q

What kind of prep do 245 burs cut?

A

Undercut prep with ROUNDED internal line angles

32
Q

What are the measurements of a 245 bur?

A

3mm top to bottom, half of the head is 1 1/2 mm and 2/3 the head is 2 mm

33
Q

Where are retention grooves located?

A

Always in dentin, just inside the D.E.J even when axial wall is deeper than ideal due to caries

34
Q
A

D1 Spring - Operative Dentistry I (12 decks)

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