Single Denture and OverDenture Flashcards
what is the most common situation in the single denture
- maxillary arch is edentulous
- mandibular arch has natural/ restored teeth
natural teeth generate _____ chewing forces against opposing denture
greater
natural teeth _____ move in function as denture does
do not
____ control placement of opposing teeth
cannot
______ puts natural teeth far from optimal positions
drifting/tilting
what is centripetal resorption
routine resorption pattern following extraction of teeth results in a smaller maxilla when compared to dentate arch
maxilla resorbs:
up and inward
a horizontal arch discrepancy is created when:
the maxillary arch narrows and becomes shorter in AP direction
____ may be required to direct occlusal forces to the bearing area in a horizontal arch discrepancy
a crossbite
what is the combination syndrom
a maxillary CD opposted by mandibular anterior natural teeth
who introduced the term combination syndrome and when
kelly 1972
describe the anatomical changes in combination syndrom
- maxillary anterior tissue mobile/hyperplasia
- inflammatory palatal hyperplasia
- maxillary tuberosities enlarged
- mandibular posterior bone resorption
- mandibular anterior teeth Supraerupted
what is the curve of monson
combination of curve of spee and the curve of wilson
curve of monson is in ____ and ____ planes
coronal and sagittal
what is the curve of monson
concave for the mandibular arch and convex for the maxillary arch
describe the curve of monson in centric occlusion
form a segment of a sphere of 4 inches radius with the center of the sphere at the glabella
____, ____, or ____ occlusal plane
reduce, restore or remove
what is occlusion
a reciprocal arrangement of elevations and depressions
why are there single denture fracrtures
- biting force of natural dnetition is approximately 5 times that of denture wearers
what happens with a single max CD to the mandibular arch
rapid loss of mandibular alveolar bone
what are the consequences that need to be discussed with a natural/ edentulous mandible
- discuss the likely poor outcome
- resilient liner in mandibular denture
- osseointegrated implants in mandible
mandibular anterior resorbs ________ as fast as maxillary anterior
4x
what is preventive prosthodontics
rapid bone loss emphasizes the need for any procedure which will slow the bone loss
what are the advantages of overdentures
- 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
when would you do overdentures
- when a conventional denture would have a poor prognosis
- when opposing an arch of natural teeth
- when combination syndrome is a factor
what are the disadvantages of overdentures
- 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
what is the selection of abutment teeth dependent on
- 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
RCT treatment is ______ for most overdenture abutments
recommended
does tooth mobility eliminate a tooth for use as an abutment
no
how can the mobility of a tooth used for an abutment be lessened
crown/root ratio improved when crown is reduced on the tooth
what teeth are most frequently selected for abutments and why
canines
- have large roots
- amenable to RCT
- strategic location at corner of arches
what are the problems with abutments
- abutment failure- caries or periodontal
- denture fracture - metal base
after 5-6 years, about ___ of abutment were lost
10%
what are the causes for loss of abutment teeth
periodontal disease, caries, endodontic complications
what type of toothbrushes are recommended for abutment teeth
mechanical
one tooth overdentures ____ tolerated
were not
fluoride gel is used on abutment teeth how often
daily application
what causes gingivitis around abutment
- movement of denture base
- poor oral hygiene
- excess space in prosthesis
how can gingivitis around abutment teeth be treated
- use of tissue conditioner
- use of hard acrylic resin
what is used for restorations on abutments
amalgam
- cast gold copings
implant bars are designed for:
hygiene
implant retained implant supported overdenture =
no pressure on the ridge
