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12 Cards in this Set
- Front
- Back
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Provisonals used for?
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crown preps b/w peprearing a tooth for a grown and cementing the crown
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Provision requirements
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1. sedate/protect pulp
2. Prevent Tooth Movement: proxmial/eruption 3. Provide occlusal fxn 4. Easily cleaned 5. Protect free gingiva-non impinging margins 6. strength and retention 7. Esthetics 8. adjust occlusion in some cases |
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types of provisional restorations
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-Prefabricated
-stock aluminum cylinders -anatomic metal crowns: soft moldable metal/reline -polycarbonate crown forms(tooth colored) -custom: direct/indirect techniques |
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Direct Techniques
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-Direct Acrylic Resin(self curing)
-fabricated on preped tooth -potentially faster -technique sensitive(can lock on tooth) -expreience shrinkage-less accurate -potential pulpal irritation -Direct Bis-Acryl(Integrity) -Direct Materials -IRM, Glass ionomer, Resins |
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Indirect Techniques
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-Indirect Acrylic Resin(self curing)
-Fabricated on fast-set plaster cast -May seem slower -More accurate fit -protects pulp -strength -delegated axuiliary personel -ucla technique |
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Direct vs. Indirect
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Direct: faster, less accurate, irritates pulp
Indirect: slower, more accurate, protects pulp |
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Procedure Overview
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1. Fabricate acrylic splint on:
-overimpression of unprepared tooth -Diagnostic cast with defets waxed in cast duplicated -alternate-alginate impression store in damp aper towl 2. prepare tooth for crown 3. impression of prep with alginate 4. Pour impression with FAST SET plaster 5. Trim cast/adapt stent to cast 6. Paint rubber sep on cast(alcote/tin) 7. Mix self-curing acrylic and place in stent 8. place cast in stent with acrylic and allow to set 9. Remove stent, insepct cast and fill in voids as indicated 10. remove excess acrylic and pry provisonal crown from cast 11. trim falsh with acrylic bur 12. try provisional on prepared tooth and adjust interproximal and occlusal contacts 13. Polish provisional 14. cement temporary cement and rmeove excess after it has set |
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Initial triming of excess acrylic
and adjust proximal contacts on casts |
acrylic bur
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contour & smooth occlusal & axial walls with large polishing points, sequence:
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dark pink, light pink, yellow
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Check proximal contacts on cast if open...
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add acrylic to close contact
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occlusion of provisonal
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adjust with 7404, eliminate high spots
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cement with?
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Temp-bond
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