Cusp Build-up and Pin Placement Flashcards Preview

SP16- Operative > Cusp Build-up and Pin Placement > Flashcards

Flashcards in Cusp Build-up and Pin Placement Deck (32)
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1
Q

The mandibular molar has ___ buccal cusps, ____lingual cusps, ___ buccal groove(s), and ___ lingual groove(s) that extend from the occlusal surface.

A

3 B cusps
2 L cusps
2 B grooves
1 L groove

2
Q

How many fossae are in the mandibular molar?

A

3 (mesial, central, distal)

*mesial and distal are triangular grooves

3
Q

Mandibular 1st Molars:
The four _____ridges (of mesiobuccal/mesiolingual cusps, and of distobuccal/distolingual cusps) join to form two ______ ridges.

A

triangular

transverse

4
Q

True or False: When viewed from the buccal, the 3 buccal cusps of mandibular molars are all close to the same height.

A

True

However, remember that the distal cusp is narrower mesiodistally

5
Q

Name the three buccal cusps of mandibular molars.

A

mesiobuccal, distobuccal, and distal

6
Q

Placement of a class II amalagam, with the cusp build-up on most of the buccal surface, involves placement with a ________ Toffelmire retainer and an extended-width matrix band.

A

contra-angle

7
Q

How is the condensing technique modified when doing a cusp build-up?

A

“overfill condensing” must be used to account for height of missing cusp

8
Q

Why would a dentist place a pin?

A

to HELP RETAIN amalgam when one or more cusps have been lost

9
Q

Pin holes are drilled entirely within _____ and generally extend _____ deep, with _____ of the pin exposed within the preparation.

A

dentin
2 mm deep
2 mm exposed

10
Q

How many pins are placed per cusp?

A

one

11
Q

How many pin types are there? What are the types?

A

three

  1. Threaded/Screw Type (hole smaller than pin size)-screw
  2. Cemented (hole larger than pin size)-cement
  3. Friction Lock (hole smaller than pin size)-tap it in
12
Q

What is the “general rule” for rubber dam isolation of posterior teeth?

A

punch holes for ONE tooth behind and TWO teeth in front

13
Q

True or False: During a cusp build-up procedure, a dentin protector is recommended.

A

True (ex. copal varnish)

14
Q

Why can’t a “universal retainer” be used for an MODBA preparation/build-up?

A

tooth structure must be re-built on the buccal, the part of the band that enters into the retainer slots will not adapt well to the buccal aspect of the tooth

15
Q

During placement of the matrix band and wedge, the band must extend ______ occlusal to the future marginal ridge and _____ gingival to the gingival margin.

A
  1. 5 - 1.5 mm occlusal

0. 5 -1.0 mm gingival

16
Q

True or False: The marginal ridge should be convex from buccal to lingual.

A

False, CONCAVE

17
Q

True or False: Base should not be placed on enamel.

A

True

18
Q

If extension of the preparation (from a primary groove toward the cusp tip) is ______ to _____ the distance, consider capping the cusp.

A

1/2 to 2/3

>2/3 usually cap

19
Q

Complex amalgam restorations can be used as ____, ____, or ______ restorations.

A
  1. Definitive (patient couldn’t afford a crown)
  2. Foundation (RUC)
  3. Control (pulp, perio, or caries issues)
20
Q

Why would amalgam be used as a “control restoration?”

A
  • Pulpal Questions
  • Periodontal Questions
  • Acute Caries Present
  • Severe Caries Present

*Control other issues before placing definitive crowns!

21
Q

We use the TMS pin system. What does TMS stand for?

A

thread mate system

22
Q

What is the drill diameter and pin diameter of the “Regular TMS” pin system? All other pins in this system are ______diameter.

A

Regular:
Pin = 0.78mm
Drill = 0.68mm

Other pins are of smaller diameter
(minim 0.61, minikin 0.48, minuta 0.38)

23
Q

Pins used at OSU are made of _____ alloy

A

titanium

24
Q

What is the pin characteristic that allows pins to snap off after drilling into the tooth?

A

“Self Shearing” Pin (small area that is NOT threaded)

25
Q

The pin drill is ____-shaped and is ____-limited

A

pear

depth

26
Q

Make sure the latch-head handpiece is set in the ____direction when using the pin system.

A

forward

27
Q

True or False: Pins should be placed at line angles and 2 drill widths in from the DEJ.

A

True

28
Q

How deep is a retentive well? How far into the tooth from the DEJ?

A
  1. 5 mm deep from pulpal floor

0. 5 mm in from DEJ

29
Q

What is the “2-2-2-2 Rule?”

A

2 mm pin hole depth
2 drill diameters inside the DEJ
2 mm length of pin
2 mm amalgam over the pin

30
Q

If close to the pulp, _____ can be used as an indirect pulp cap to stimulate dentin.

A

calcium hydroxide (or RMGI)

31
Q

True or False: ZOE should not be used under composite.

A

True

32
Q

What is the purpose for using copal varnish?

A

seal tubules and prevent sensitivity