fixed partial dentures, introduction and treatment planning

Question 1

when talking about FPD’s , what is the retainer, abutment, potic and connector?

Answer 1

retainer- crown, abutment- tooth, pontic-tooth form, connector- connects the pontic to abutments and is rigid or non-rigid.

Question 2

explain rigid and non rigid connectors

Answer 2

rigid acts as a solid piece. Non-rigid acts as a key and lock and they slide into each other

Question 3

what does treatment planning involve?

Answer 3

discussing the sequence of the treatment with the patient. The patient should sign a form accepting the plan.

Question 4

a good plan should inform the patient about…….

Answer 4

current conditions, extent of treatment, time and cost, home care needed

Question 5

why is it important to offer multiple plans?

Answer 5

failing to explain and present alternatives may be considered legally negligent.

Question 6

what are some main points to keep in mind while creating a treatment plan?

Answer 6

correcting a disease, restoring function, prevention of future disease, improving appearance.

Question 7

missing teeth can be replaced by 3 methods

Answer 7

removable partial denture, fixed partial denture, implant supported fixed partial denture.

Question 8

what are factors that must be weighed when choosing the type of prosthesis?

Answer 8

biomedical, periodontal, esthetic, financial, patient wishes.

Question 9

vital teeth are better than non-vital for abutments. Non vital can be used if…….

Answer 9

asymptomatic, root canal is sealed, complete obturation of canal, need some sound coronal tooth structure.

Question 10

why examin the peridontium before FPD?

Answer 10

supporting tissues need to be healthy. Abutment teeth cannot be mobile because they carry an extra load.

Question 11

roots and supporting tissues should be evaluated for 3 things

Answer 11

crown-root ration, root configuration, periodontal ligament area.

Question 12

crown to root ratio must be…

Answer 12

2:3, but a minimum of 1:1 is accepted

Question 13

why look at root configuration before an FPD?

Answer 13

wide divereged roots holdthe FPD better than skinny converged roots.

Question 14

why look at rooth canal before FPD?

Answer 14

irregular configuration with some curvature holds better that straight roots

Question 15

why look at the PDL area before FPD?

Answer 15

the bigger the root the bigger the surface area for PDL attachment which stabilizes the tooth

Question 16

whats Antes law?

Answer 16

the root surface area of the abutment teeth have to be equeal or surpass that of the teeth being replaced with pontics

Question 17

Bending/deflection of pontic

Answer 17

directly proportional with the cube of the length. Ex: a 2 toothed pontic span allows 2x2x2=8 times the bending of a single tooth pontic span

Question 18

bending/deflection and pontic thickness.

Answer 18

its inversely proportional with the cube of the occluso-gingival thickness of the pontic. Ex: 1/2 pontic thickness–> 8 times the bending

Question 19

single crowns are dislodged more easily in what direction?

Answer 19

Facial/lingual

Question 20

FPD’s are more easily dislodged in what direction?

Answer 20

mesial/lingual

Question 21

which tooth causes the most problems with path of insertion?

Answer 21

the mandibular 2nd molars because its on an angle

Question 22

why is this a problem?

Answer 22

it will impede the retainer from seeting correctly. So orthodontic work might need to be done

Question 23

proximal half crown on FPD

Answer 23

this only uses the proximal half of a tooth as an abutment. This is another way to avoid orthodontic work.

Question 24

telescope crown FPD

Answer 24

basically this reduces the abutment more to allow for the retainer to sin without being impeded by the tooth behind it.

Question 25

non rigid connector FPD

Answer 25

this allows you to seat the FPD at an angle so you could seat it without being impeded.