Provisionals Flashcards
What are the biological requirements of provisionals?
Pulp Protection Periodontal health maintenance Proper occlusal contacts Maintain tooth position/proximal contacts Prevent enamel fracture
What are the mechanical requirements for provisionals?
Resist functional loads
Resist removal forces
Maintain interabutment alighnment
What the esthetic requirements for provisionals?
Color match
Translucency
Color stability
Easy contour
What are the two materials we need to make for a provisional?
External surface form
Tissue surface form
What are the two types of external surface form?
Custom
Preformed
What are the types of preformed external surface forms?
Resin
Metal
What resins can be used for external surface form?
Polycarbonate
Cellulose acetate
What metals can be used for external surface form?
Aluminum (plain)
Aluminum (anatomic)
Tin-silver
Nickel-chromium
What are the advantages to a direct procedure provisional?
The pt’s prepped teeth and gingiva provide the TSF
This is convinient when office lab facilities are inadequate for efficiently producing an indirect restoration
What are the disadvantages of a direct provisional procedure?
Potential tissue trauma from the polymerizing resin and inherently poorer marginal fit
What are ideal properties of a provisional restoration?
Convenient handling Biocompatibility Dimensional stability Ease of contouring and polishing Adequate strength and resistance Good appearance Acceptable to pt Ease of repair Compatible with luting agents
How far should the ESF be from the gingival margin?
4-5mm
On a #3 prep, what teeth should the ESF cover?
1-4
At what stage of solidification should you start moving the ESF occlusally and back?
Rubbery stage
