pros need to know Flashcards
what is the vibrating line?
junction between the hard palate and soft palate
what is the occlusal plane?
- horizontal surface occupied by upper teeth
- extends from tip of mesioincisal edge of upper central incisor to tip of mesiobuccal cusp of upper 1st molar on each side
what is the neutral zone?
a specific area where the function of the musculature will not unseat the denture and where forces generated by the tonque are neutralised by the forces generated by the lips and cheeks
how is denture stability achieved?
- by making sure the peripheries of denture are extended to the right depth
- by making sure the occlusion is balanced
what is the occlusal rim?
a wax structure with occluding surfaces attached to temporary or permanent denture bases
what is an occlusal rim used for?
- used for recording the relation of the maxilla to the mandible
- positioning the teeth
which articulator is preferred for use?
fixed condylar articulator
why are non arcon articulators inaccurate?
- condylar inclination changes as articulator is open
- can lead to inaccuracies when a protrusive record is being used to determine articulator settings
why would you need to rebase and reline a denture?
- bone resorption
- multiple denture fractures
- denture base deterioration
what features should be present on maxillary definitive impressions?
- tuberosity
- hamular notch
- extension anterior to the vibrating line for post dam
- functional depth and width of sulcus to create a food peripheral seal and ensure hard palate and residual ridge are functional for primary support
what features should be present on a mandibular definitive impression?
- coverage of pear-shaped pad and buccal shelf
- retro-molar pad and extension into the lingual pouch should occur
- functional width and depth of the sulcus
- ensure there is area of primary support of buccal shelf and retromolar pad
what general features should be present on definitive impressions?
- ensure denture bearing areas are covered
- ensure there is good functional sulcus present
- ensure there is good surface detail with no air blows
what indicates the posterior border of the maxillary denture?
- post dam- sits 1-2mm anterior of vibrating line
where should a maxillary denture sit in order to creat a good posterior seal?
- at the level of the hamular notch-located between distal surface of tuberosity and hamular process of medial pterygoid plate of maxilla
what impression materials are used for primary impressions?
impression compound
alginate
