Single Denture and OverDenture

Question 1

what is the most common situation in the single denture

Answer 1

• maxillary arch is edentulous
• mandibular arch has natural/ restored teeth

Question 2

natural teeth generate _____ chewing forces against opposing denture

Answer 2

greater

Question 3

natural teeth _____ move in function as denture does

Answer 3

do not

Question 4

____ control placement of opposing teeth

Answer 4

cannot

Question 5

______ puts natural teeth far from optimal positions

Answer 5

drifting/tilting

Question 6

what is centripetal resorption

Answer 6

routine resorption pattern following extraction of teeth results in a smaller maxilla when compared to dentate arch

Question 7

maxilla resorbs:

Answer 7

up and inward

Question 8

a horizontal arch discrepancy is created when:

Answer 8

the maxillary arch narrows and becomes shorter in AP direction

Question 9

____ may be required to direct occlusal forces to the bearing area in a horizontal arch discrepancy

Answer 9

a crossbite

Question 10

what is the combination syndrom

Answer 10

a maxillary CD opposted by mandibular anterior natural teeth

Question 11

who introduced the term combination syndrome and when

Answer 11

kelly 1972

Question 12

describe the anatomical changes in combination syndrom

Answer 12

• maxillary anterior tissue mobile/hyperplasia
• inflammatory palatal hyperplasia
• maxillary tuberosities enlarged
• mandibular posterior bone resorption
• mandibular anterior teeth Supraerupted

Question 13

what is the curve of monson

Answer 13

combination of curve of spee and the curve of wilson

Question 14

curve of monson is in ____ and ____ planes

Answer 14

coronal and sagittal

Question 15

what is the curve of monson

Answer 15

concave for the mandibular arch and convex for the maxillary arch

Question 16

describe the curve of monson in centric occlusion

Answer 16

form a segment of a sphere of 4 inches radius with the center of the sphere at the glabella

Question 17

____, ____, or ____ occlusal plane

Answer 17

reduce, restore or remove

Question 18

what is occlusion

Answer 18

a reciprocal arrangement of elevations and depressions

Question 19

why are there single denture fracrtures

Answer 19

• biting force of natural dnetition is approximately 5 times that of denture wearers

Question 20

what happens with a single max CD to the mandibular arch

Answer 20

rapid loss of mandibular alveolar bone

Question 21

what are the consequences that need to be discussed with a natural/ edentulous mandible

Answer 21

• discuss the likely poor outcome
• resilient liner in mandibular denture
• osseointegrated implants in mandible

Question 22

mandibular anterior resorbs ________ as fast as maxillary anterior

Answer 22

4x

Question 23

what is preventive prosthodontics

Answer 23

rapid bone loss emphasizes the need for any procedure which will slow the bone loss

Question 24

what are the advantages of overdentures

Answer 24

• denture support is increased and soft tissue trauma is decreased
• stability of denture is increased
• maintenance of periodontal proprioception improved chewing efficiency
• psychological benefit to the patient
• residual ridge integrity- improved stress distribution
• stability and retention
• patients perception of preserved natural teeth
• viable and simple alternate technique to CD
• application is virtually unlimited

Question 25

when would you do overdentures

Answer 25

- when a conventional denture would have a poor prognosis - when opposing an arch of natural teeth - when combination syndrome is a factor

Question 26

what are the disadvantages of overdentures

Answer 26

- likely time dependent transition to CD, depends on patients oral hygiene and nature of selected abutments - age related inability to follow proper hygiene - presence of refractory periodontal disease - caries - frequent recall appointments, expense - available interarch space - weakness in acrylic denture base - cast coping - increases lab procedures/expenses - cost more than conventional denture - denture is bulkier in some areas - denture more subject to fracture - perio

Question 27

what is the selection of abutment teeth dependent on

Answer 27

- periodontal and mobility status (horizontal bone loss) - abutment location (canines. premolars), at least one tooth per quadrant, no adjacent teeth - endodontic and prosthodontic status: anteriors easy for endo. in cases of calcification endo can be avoided crowns can be modified- sealant/fluoride/ use of copings, composite, alloy restorations, retention attachment system

Question 28

RCT treatment is ______ for most overdenture abutments

Answer 28

recommended

Question 29

does tooth mobility eliminate a tooth for use as an abutment

Answer 29

no

Question 30

how can the mobility of a tooth used for an abutment be lessened

Answer 30

crown/root ratio improved when crown is reduced on the tooth

Question 31

what teeth are most frequently selected for abutments and why

Answer 31

canines - have large roots - amenable to RCT - strategic location at corner of arches

Question 32

what are the problems with abutments

Answer 32

- abutment failure- caries or periodontal - denture fracture - metal base

Question 33

after 5-6 years, about ___ of abutment were lost

Answer 33

10%

Question 34

what are the causes for loss of abutment teeth

Answer 34

periodontal disease, caries, endodontic complications

Question 35

what type of toothbrushes are recommended for abutment teeth

Answer 35

mechanical

Question 36

one tooth overdentures ____ tolerated

Answer 36

were not

Question 37

fluoride gel is used on abutment teeth how often

Answer 37

daily application

Question 38

what causes gingivitis around abutment

Answer 38

- movement of denture base - poor oral hygiene - excess space in prosthesis

Question 39

how can gingivitis around abutment teeth be treated

Answer 39

- use of tissue conditioner - use of hard acrylic resin

Question 40

what is used for restorations on abutments

Answer 40

amalgam - cast gold copings

Question 41

implant bars are designed for:

Answer 41

hygiene

Question 42

implant retained implant supported overdenture =

Answer 42

no pressure on the ridge