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19 Cards in this Set
- Front
- Back
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Requirements for provisional restorations compared to permanent?
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Same except for logevity and sophistication of color.
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Requirements to protect prepared tooth?
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-irriation from bacterial plaque and saliva
-exposure to irritating and painful stimuli -abrasion or breakage of prepared tooth surfaces |
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Requirements to maintain periodontal health?
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-non impinging margins
-maintaining proper contours -maintaining proper surface texture and finish |
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Requirements to maintain intra- and inter arch tooth stability?
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-occlusal contacts
-proximal contacts -inter abutement stabillity |
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Requirements to restore masticatory function?
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-centric occulusal contacts
-lateral and protrusive guidance |
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Requirements to maintain phonetics?
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-tooth position
-tooth length -facial support -pontic form |
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Restore esthetics?
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-proper contours for facial support
-proper tooth form for dental appearance -tooth shade compatible with the remaining teeth |
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Direct technique
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-Used 90% of time
-for 4 or less -time requried for fabrication |
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Indirect technique
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-decreased irritation to pulpal and gingival tissues
-patient comfort/allergies -presence of multiple undercuts (on adjacent teeth) -Long span or multiple unit prostheses (5 or more) |
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Preformed crowns types?
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-single unit restorations
-Polycarbonate, aluminium or tin silver, Nickel chormium or stainless steel (pediatric dentistry), cellulose acetate |
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Custom molded crown or Fixed partial denture forms types?
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Vacuum formed matrix, silicone putty matrix, alginate impression, etc
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Provisional preformed restorations advantages and disadvantages?
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-limited to single units
-must be lined with autopolymerizing resin -considerable amount of modification -used for first visit emergency when crown is missing |
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Custom molded crown or bridge forms advantage or disadvantages?
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-less time consuming
-must be used for multiple units -improved contours and esthetics -simulates planned restoration (when used in combination witha diagnostic wax up) |
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Custom provisional restoration materials
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Acrylic resins
-polymethyl methacrylates -poly R methacrylates Bis Acryl composites -chemically activated -visible light activated -dual activated |
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PMMA acrylic resins advantages?
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Advantages:
-low cost -good wear resistance -good esthetics -high polishability -can be relined and repaired |
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PMMA acrylic resins disadvantages?
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-exothermic rxn
-high degree of shrinkage (8%) -strong, objectionable odor -must be hand mixed -radiolucent (doesn't show up on radiograph) |
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Bis acryl composite advantages?
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-less shrinkage
-minimal heat generated during setting -minimal odor -most products use automix delivery -easy to trim -radiopaque |
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Bis acryl composite dis advantages?
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-increased cost
-air inhibited layer present after polymerization -looses surface luster with time -more brittle than acrylics -difficult to reline/repair |
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Problems associated with provisional restorations?
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-time requried for fabrication
-time provisional is in the oral cavity -materials availiable for provisional restorations |
