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Flashcards in complex amalgam restorations Deck (7)
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1

when to replace a cusp

when the facial or lingual extension exceeds 2/3 the distance from a primary groove towards the cusp tip
when the facial-lingual extension of the occlusal preparation exceeds 2/3 the distance between facial-lingual cusps
when the cusp is not well supported by dentin

2

types of pins

cemented
friction locked
threaded

3

type of pin used in class

threaded (.024/.61)-silver

4

where is the whole for a pin placed

2 drill diameters from the DEJ along the line angles
at angle that matches that of the external surface of the tooth (parallel to the root surface)

5

2222 rule

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

6

location of retentive wells

1/2mm into the DEJ with an undercut
need to be able to fit the small condensor

7

drill diamter
pin diameter

.53 mm
.61mm