Posterior Fixed Partial Dentures

Question 1

Supraeruption of the opposing tooth (into the space of the missing tooth) could cause what to occur

Answer 1

compromised embrasures; plaque accumulation interproximally

Question 2

This could cause sensitivity of the supra-erupted tooth

Answer 2

exposed root surface

Question 3

What could the surrounding teeth do to the missing tooth space

Answer 3

move toward the area

Question 4

What are three results of prolonged tooth loss

Answer 4

malocclusion
decreased chewing efficiency and esthetics
alterations in speech

Question 5

What are the four options to restore an edentulous area

Answer 5

implant
FPD
RPD
orthodontic treatment

Question 6

What are three advantages of an implant

Answer 6

don’t have to remove tooth structure
approx. same cost as an FPD
crowns may be retrievable

Question 7

What are five disadvantages to an implant

Answer 7

requires surgery
healing time
may need temporary prosthesis
additional planning
patient must meet certain criteria

Question 8

What are some mechanical issues with an implant

Answer 8

keeping implant scores tight

screw fracture

Question 9

What are two advantages of an FPD

Answer 9

feels fairly permanent

capable of good esthetics

Question 10

What are five disadvantages of an FPD

Answer 10

involving irreversible preparation of minimally restored or unprepared teeth
prepared teeth are susceptible to recurrent decay
cost for remake
fixed, cemented, non-retrieavle
hygiene more involved

Question 11

What are three advantages/indications of an RPD

Answer 11

when extracted molars need replaced
when acrylic will improve appearance
soft tissue and tooth replacement with RPD will support the lip and cheek
less expensive

Question 12

What is a disadvantage of an RPD

Answer 12

requires an essential amount of metal framework and tooth support to replace a single tooth

Question 13

What are five considerations in tooth replacement

Answer 13

preservation of soft and hard tissue health
structural durability-long term function
esthetics
comfort
finances

Question 14

What are the four components of an FPD

Answer 14

abutments; the adjacent teeth to the edentulous teeth
ponitc; the portion of the FPD replacing the missing area
retainer; the portion of the FPD going over the abutments
connecter; “connecting” the retainers to the pontic

Question 15

This should be evaluated on the abutments

Answer 15

periodontal health; must be stable for an FPD

Question 16

This is important to keep in mind when preparing the abutment teeth, it is important to keep parallel but is not always that easy in real life clinics

Answer 16

POW

Question 17

What are two contraindications to FPDs

Answer 17

excessive endentulous span

weak abutment teeth

Question 18

What is Ante’s law

Answer 18

peri-cemental area of abutments > peri-cemental area replaced in FPD
periodontal area of the abutments must be larger than the periodontal area of the pontic

Question 19

As endentulous span increases in length, this also increases

Answer 19

deflection

Question 20

The smaller/thinner the connecter height/width, the higher the what

Answer 20

deflection

Question 21

What three things are critical in abutment selection for FPDs

Answer 21

clinical crown to root ratio
root form
tooth angulation

Question 22

What is the optimum crown to root ratio for abutment teeth

Answer 22

2/3

Question 23

The root surface area is important because of why

Answer 23

periodontal support
posterior teeth/canines are ideal
premolars are okay
incisors are not favorable

Question 24

If there is complications are creating an ideal POW, what can be used to fix it

Answer 24

tooth repositioning; orthodontics
use of intracoronal attachments
conservative removal of offending proximal contact of adjacent teeth

Question 25

What critical dimensions of the edentulous areas should be evaluated

Answer 25

mesiodistal width
occlusocervical distance
bucco-lingual diameter of remaining alveolar ridge

Question 26

This pontic shape is also called the saddle, it is esthetically pleasing because it stimulates the contours and emergence profile of missing tooth; not recommended, difficult to clean mucosal surface

Answer 26

ridge lap pontic

Question 27

This pontic shape is indicated for posterior mandible, is it not esthetic and acts like a shelf for food on the maxillary, however on the mandible there is easy plaque control and easy to clean (1-2mm distance between the pontic mucosal surface and mucosa

Answer 27

hygienic pontic

Question 28

This is the most common pontic shape; it is esthetic and cleanable; best in the anterior region and for some maxillary premolars and molars

Answer 28

modified ridge lap

Question 29

This pontic shape is ideal for mandibular molar without esthetic requirement, knife-edge ridges; easy to clean

Answer 29

bullet pontic

Question 30

This pontic shape has a good emergence profile but generally augmentation of the ridge or socket preservation after extraction are required

Answer 30

ovate pontic

Question 31

This is a pontic with only one abutment; distal is not preferred because it causes unfavorable occlusal loads on abutments

Answer 31

cantilevered pontic

Question 32

What tooth is the best indication for a cantilevered pontic

Answer 32

lateral incisor; can use the canine as the abutment

Question 33

What is the biological considerations of the ridge contact

Answer 33

pressure free contact between the pontic and underlying tissues is indicated to prevent uncertain and inflammation of the soft tissues

Question 34

What is the biological considerations of the gingival surface of the pontic

Answer 34

for esthetics in the anterior region; pontic should contact the gingival tissue on the buccal aspect to give the appearance of “emerging from the tissue” to make it look more natural
in the posterior region; attention should be paid to occlusion, function, and hygiene

Question 35

In a pier abutment, the middle abutment can act as a fulcrum during function so the retainers need to be what

Answer 35

retentive