Introduction to Design Flashcards
what proportion of people in Britain have removable prosthetic denture?
1/6
3 stages undertaken BEFORE denture is designed
- assessment (diagnosis, tx plan)
- primary impression
- survey articulated casts
3 purposes of surveying
- identify and remove unwanted undercuts
- determine path of insertion (POI)
- decide clasp material
explain hygienic principles of denture design
avoid unnecessary coverage of gingival tissues (at least 3mm from margin where possible) –> create space for natural cleansing and OH measures,eg saliva can clear bacteria
3 design principles of dentures
- hygienic
- simplistic
- does no harm
what should be designed first: crowns or dentures? why?
crowns
can design crown to aid denture, eg adding rest seats, buccal undercuts
sequence of design process 6
- saddles/ teeth to be replaced
- support
- retention
- reciprocation
- anti-rotation/ indirect rotation
- major connector
define
a. support
b. retention
a. support: resistance of movement towards mucosa
b. retention: resistance of movement away from tissues/along poi
3 types of support in order of pref
tooth
tooth and mucosa
mucosa
if support is mucosa only, how should denture be designs
wide, to spread the occlusal load across the soft tissues:
max extenstion to hamular notch, tuberosities, vibrating line, retromolar pad
3 possible names/locations of rest seats
- occlusal rest: on molar/premolar
- incisal rest: on lower canine
- cingulum rest: on upper canine
explain the 3 ways to gain retention
- mechanical: clasps, precision attachments
- path of insertion
- physical (saliva)
how many retainers ideal in a denture?
2
what denture material is used on patients with a lot of missing teeth?
acrylic
advantages of acrylic dentures 3
- cheap
- relatively easy to construct
- easy to modify
