Important Numbers and Exceptions

0.01-0.02

What is the ideal undercut value below the HOC?

2/3

The retentive arm is _____ above the HOC

1/3

The retentive arm is _____ below the HOC

1/2

The retentive arm tapers diameter by ____ at 1/10 of the wire

1/10

The retentive arm tapers diameter by 1/2 at ____ of the wire

junction of middle 1/3 and gingival 1/3

The reciprocal arm is placed where on the tooth?

3

The superior border of the I bar should be at least ___ mm from the gingival margin

0.02

The I bar should not be used if the soft tissue undercut is more than ____ "

10

The RPI clasp should be ___ mm long from the origin of the distal extension partial denture

ALL

The Basic Cast Circumferential Clasps are used for what kennedy classes ?

II, III, IV

Embrasure clasps are used for what kennedy classes?

mesiolingual, mesiobuccal

Ring clasps have a 0.01" undercut which is a ______ or _______ undercut (near side)

tilted molars (widened occlusal table)

Ring clasps are specifically indicated for what?

reverse action clasps

What clasp do you need a 7mm height with little to no undercuts?

6

An advantage of WW combo clasps is that elongation is more than ____%

0.02"

For WW combo clasps you need what undercut?

2.5

Occlusal rests need to be ____ mm at the base

1/2

Occlusal rests are ___ intercuspal width

1/3 to 1/2

Occlusal rests are ___ to ___ MO width

1.5

Marginal ridge needs to be reduced by at least ____ mm for an occlusal rest

0.5

The floor of the rest apical to marginal ridge needs to be _____ mm deeper than the marginal ridge

90

The occlusal rest needs to be less than ____ degrees to prevent slippage

incisal rest

Which rest seat is the least desirable?

max canines

Crescent rest seats are for what teeth?

2.5-3 mm

What is the MD length of a crescent rest seat?

1.5 mm

What is the labiolingual width of a crescent rest seat?

1.5 mm

What is the incisal apical depth of a crescent rest seat?

1-1.5 mm

What is the gingival floor depth of a ledge rest seat?

90 degrees

What angle is a ledge rest seat?

lateral excursive contact

A ball/lug rest seat is placed to minimize what?

support

Major connectors offer what function?

6

A major connector must be __ mm from the gingival margin

0.5 mm

A max. major connector must be beaded ___ mm to reduce sensation of foreign objects

palatal torus or prominent median suture line

Beading for maxillary major connector is not done when?

Class III (short edentulous span)

A palatal strap is used for what class?

8-15 mm

How wide should a palatal strap be?

any

Palatal plate is used for what classification?

palatal plate

What is the least desirable max. major connector?

III and IV w/ ant. mod

Anterior palatal strap is used for what class?

8 mm

Antero-posterior strap must be how wide?

5 mm high, 2 mm thick

Lingual bar is half pear shape with what dimensions?

3 mm

The superior border of a lingual bar must be how far from the gingiva?

8 mm

The superior border of a lingual bar must be how far from the functional depth of the vestibule?

lingual plate

What mandibular major connector is used when there is a high frenum or lingual vestibule less than 7 mm?

2-3 mm

A double lingual bar must be how thick incisogingivally?

0.6-1 mm

A double lingual bar has what thickness?

1.5

The junction of an occlusal rest and minor connector must be at least ____ mm

32 gauge (0.2 mm)

Minor connectors have to relieve gingival tissues with wax that is how thick?

5 mm

How much distance must be between two minor connectors?

1 mm

Minor connectors should be about ____ mm over the ridge crest buccally?

2 mm

Minor connectors should be about ___ mm short from the lingual border

90

Finish lines are less than ___ degrees between major and minor connectors

2

Maxillary external finish line should be ___ mm to palatal surfaces

palatal

Maxillary internal finish line should be more _____ to external

guide plate

Mandibular external finish line should be continuous from what component?

mesial

Mandibular internal finish line should be _____ to external?

support

Denture bases have what feature?

axial

Tooth supported (class III) RPDs are axial/non-axial loading

non-axial (counting IV as tissue and tooth based on biomechanics lecture)

Tooth and tissue supporting (I, II, IV) are axial/non-axial loading

Class III

Quadrangular confirmation of clasp positions are for what classification?

Class II

Triangular confirmation of clasp positions are for what classification?

Class I

Bilateral confirmation of clasp positions are for what classification?

44%

What percentage of max. premolars with root canals fail without a crown?

50%

What percentage of max. molars with root canals fail without a crown?

37.5%

What percentage of mand. premolars with root canals fail without a crown?

42.3%

What percentage of mand. molars with root canals fail without a crown?