module 3- FDP Flashcards
(57 cards)
group function
multiple contacts on the working side only
mutually protected
anterior teeth protect posterior teeth, and vice versa
balanced occlusion
in dentures, contact on both sides (to provide stability)
what can limit restorative space
over-erupted teeth and tilted teeth
name 3 ideal root configurations for abutment teeth
- divergent roots
- oblong pulp
- multiple roots
define ante’s law
total periodontal attachment area of abutments should equal to or be greater than that of the teeth being replaced
what is the exception for using a weakened abutment tooth for an FPD
if it is opposing a complete denture (due to lower forces)
what 3 things make a good abutment
- good C:R ratio
- ideal root form
- good PDL area (Ante’s law)
what is the relationship between deflection and span length
deflection = (span length factor)^3
if you go from 1 pontic to 2 pontics, what happens to deflection
8x
what tolerates deflection better: metal or ceramics?
metal
name 4 “solutions” to counter deflection/long spans
- grooves (buccal and lingual)
- base metal framework
- good connector space
- double abutments
3 disadvantages of increasing connector space
- poor esthetics
- poor oral hygiene
- poor perio health (impinge on gingiva)
what is the relationship between strength and height of connector space
strength = (height factor)^3
what is the relationship between strength and width of connector space
strength = (width factor)^1
if i increase the height of the connector space by a factor of 2, what happens to the strength?
8x
if i increase the width of the connector space by a factor of 2, what happens to the strength?
2x
A primary abutment has a C:R of 2:3. Which of the following is a good option for double abutment?
a) tooth with 1:1
b) tooth with 2:3
c) tooth with 2:1
d) tooth with 1:2
b) tooth with 2:3
which of the following is the most ideal C:R for an FDP abutment?
a) 1:1
b) 1:2
c) 2:3
d) 2:1
c) 2:3
true or false: a double abutment with a retentive retainer can be used to replace an over-tapered retainer for primary abutment
false. double abutments should not be used because there is poor retention in the primary abutment
where does the non-rigid connector attach to on the pier abutment
on the distal surface
does the pier abutment contain the lock or the key of the non-rigid connector?
the lock. the lock goes on the anterior retainer
tooth 33 is a pier abutment. which tooth has the slot?
a) 31
b) 32
c) 33
d) 34
c) 33
tooth 33 is a pier abutment. which tooth has the key?
a) 31
b) 32
c) 33
d) 34
d) 34
