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36 Cards in this Set
- Front
- Back
how can natural and artificial teeth differ? |
proprioceptiondisplaceabilitypositionwearability/efficiencyarea of support
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what is natural tooth proprioception like?
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PDL that has propioceptive receptors that provide neuromuscular system control to avoid prematurities during function
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what is artificial tooth proprioception like?
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proprio receptors lost so not NM system to avoid prematurities during function
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how much do natural teeth displace due to occlusal pressures
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vert: 0.03 mmhor: 0.03 mm
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how much to art teeth displace?
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they are set in a base with no indep movementvert: 0.4 mm (10x more)hor: as much as several mm
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max resorption directions
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up and in
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mand resorption directions
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down and out
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where do you set anteriors due to resorption of ridges over time
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where the natural teeth would be (support of lips and facial esthetics)
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where do you set posteriors due to resorption of ridges over time
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lingually
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do natural teeth show wear under normal conditions?
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no (only in nonphysiologic occlusion)
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are natural or art teeth more efficient for chewing?
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natural
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what can wear art teeth
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abrasive food diet
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the periodontal area of a tooth is approximately __ the area of the mucous membrane of the cervical area of the tooth
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4x
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mutually protected occlusal scheme is...
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canine/anterior guided
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group function occlusal scheme is...
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immediate/progressive
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2 types of occlusal schemes for natural teeth
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mutually protectedgroup function
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2 types of organized occlusal schemes for artificial teeth
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balancednon-balanced
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what is balanced occlusion
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flat set to a curvecross arch set to a curvecross arch/cross tooth set to a curve
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what is non-balanced occlusion
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neutrocentric
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what determines occlusal scheme for setting art teeth
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relationship of ridges (BL and AP)vert/hor overlap of anteriorsexisting ridge supportesthetic requirement for post teethorientation of occlusal planeability to find pts CR
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mounting casts for natural teeth
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CR if indicatedMI if indicated (habitual bite)
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mounting casts for art teeth
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always use CR for c/c or c/rpd
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VDO in nat vs art teeth
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usually established in naturalneeds to be established in artificial
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tooth contacts in nat vs art teeth
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ideally cusp/fossa in naturalcould be cusp/fossa or flat in artificial
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balancing contacts in nat vs art
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not ideal in nat but could be adapted toused to stabilize dentures during function in art
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how do non vertical (aka horizontal) forces affect nat vs art teeth?
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adapted to and asymptomatic in natnot adapted to, symptomatic in art
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overlapping of incisors in nat vs art
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mutually protected counts on ant contact to clear posteriors in excursivescontact of anteriors in excursives will cause destabilizing forces and cause destablizing forces of the c/
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which arch of c/c will incisor contact in excursives affect with destabilizing forces
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upper
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envelope of function for nat vs art
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nat: teardrop, unilateral chewing art: up and down; bilateral chewing
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force of closure for pr with natural teeth
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5-175 lbs
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force of closure in pt with art teeth
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22-24 lbs
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common signs of malocclusion in nat teeth
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wear, widened PDL, mobility, soreness in muscles of mastication/TMJs, advancement of existing perio disease in natural dentition
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common signs of malocclusion in art teeth
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immediate responseulceration, inflammation, proliferation of mucosa, loss of bone
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mc cause of surface roughness on a cast
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adherence of alginate to enamel
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possible reasons for cast roughness
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adherence to enalemsalvia or other fluids on impresison surfacecompressed air useinsufficient spatulation of alginate or stonepremature removalcontaminated stonesingle pour technique
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how long after to remove alginate impresion from stone
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45-60 min otherwise you get etching (soft/chalky)
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