provisional restorations Flashcards
(19 cards)
When are provisional restorations required for fixed prosthodontics?
Provisional crowns, bridges and dentures/overdentures
Provisional restorations are temporary solutions that help maintain function and aesthetics until the definitive restoration is placed.
name 3 methods to create a provisional restoration?
Pre-operative putty impression
pre-formed crown
pre-operative wax up followed by duplication and vacuumed formed stent
free-hand bis-acrylic resin
use the old crown if there is one
This method involves reproducing the tooth in its current shape or modifying it as needed.
What material is used to make a provisional crown using a pre-operative putty impression?
Chemically-cured bis-acryl composite resin (Protemp, Integrity)
This resin is used for its ease of manipulation and setting properties.
pre-formed crowns can be made of what 4 materials?
polycarbonate
cellulose acetate
composite
metal
What type of teeth can polycarbonate crowns be used for?
Premolars and incisors
Polycarbonate crowns are not suitable for molars.
what is used to bond polycarbonate preformed crowns?
Only work with cold cure acrylic resin (TRIM)
polymethylmethacrylate
What is the bonding characteristic of polyethylmethacrylate in provisional restorations?
Bonds to the inside of the crown and doesn’t fall apart when trimmed
This property allows for easy shaping and polishing of the crown.
How is cellulose-acetate used in creating provisional restorations?
Cut to size, perforate incisal corner, fill with Pro-temp, place over prep, cure, remove, polish margins, check occlusion, cement
This method allows for quick fabrication of provisional crowns.
what teeth are composite pre-formed provisional restorations used for? how?
Used on molars
patient closes into position and are light cured
Composite material allows for a quick setting and adaptation to the tooth.
Why are metal pre-formed provisional restorations rarely used?
Bad margins where plaque accumulates
Metal crowns can lead to hygiene issues due to plaque retention.
what is used to line pre-formed metal provisional crowns before cementation?
protemp
when is a pre-operative wax-up followed by duplication and vacuum-formed stent used?
When wanting crowns on multiple teeth and changing the occlusion/guidance
This method provides a template for accurate provisional restorations.
What is the last resort method for making a provisional restoration?
Free-hand bis-acryl resin
This method is time-consuming as it requires polishing down the material.
When are provisional post crowns suitable?
When the existing root canal filling is satisfactory
e.g. just obturated or simple replacement of post crown
Provisional post crowns are not suitable during root canal treatment.
2 diagnostic uses of provisional restorations?
To check if the crown prep has undercuts or if there is enough interocclusal clearance
This helps in assessing the fit and function before final impressions.
What therapeutic uses do provisional restorations have? 3
Improve gingival/periodontal health by allowing better cleaning access
improve speech difficulties
improve appearance
This is crucial before taking impressions for definitive restorations.
How can provisional restorations help with speech difficulties?
By changing contours of palatal surfaces of upper anteriors
Adjustments can facilitate better articulation.
What is easier to change, provisional restorations or definitive ones?
Provisional restorations
This flexibility allows for adjustments to be made based on the patient’s needs.
When should the provisional restoration be made?
When you are happy with the tooth preparation and before the impression stage (so can modify the prep if required)
This timing allows for any necessary modifications to the preparation.
