Temporary Restoration

Question 1

Which properties temporary crown should have ?

Answer 1

1. Pulpal protection
2. fabricated of a material that will prevent the conduction of temperature extremes
3. The margins should be adapted well enough to prevent leakage of saliva
4. Positional stability
5. The tooth should not be allowed to extrude or drift in any way
6. Any such movement will require adjustments or a remake of the definitive restoration at the time of cementation.

Question 2

Why should the restoration be not over impinging margins ?

Answer 2

Cause it will resulting inflammation could cause :
1. gingival proliferation, recession
2. at the very least hemorrhage during the impression or cementation

**A damaging overhang can result from a preformed metal or resin provisional restoration that has not been contoured properly, while a custom resin provisional crown can produce a horizontal overhang if it is incorrectly trimmed

Question 3

A restoration with drastically underextended margins complications ?

Answer 3

proliferation of gingival tissue.

Question 4

A broken temporary fixed partial denture can accelerate ?

Answer 4

tooth movement

Question 5

What’s the role of esthetic in temporary crown ?

Answer 5

**In some cases, the restoration must provide a good esthetic effect, particularly on anterior teeth and premolars
**Aesthetics – when gross morphological changes are planned

Question 6

How does Provisionals based on diagnostic wax-ups help in preparation ?

Answer 6

1. are minimally invasive, and are ideal for assessing aesthetics and function before carrying out irreversible tooth preparation
2. sufficient tooth removal in order to accommodate restorative materials using intra-oral guides for precise and calculated tooth reduction

Question 7

What’s types of temporary restoration for inlays and small restorations to crowns and bridges ?

Answer 7

These range from zinc oxide– eugenol cement for small intracoronal inlay preparations to provisional crowns and provisional fixed partial dentures.

Question 8

Which types of temporary restorations do we have ?

Answer 8

prefabricated or custom made

Question 9

What’s the prefabricated types ? When to use ?

Answer 9

Prefabricated forms include :
1. stock aluminum cylinders (“tin cans”)
2. anatomical metal crown forms
3. clear celluloid shells
4. tooth-colored polycarbonate crown forms.

They can be used only for single tooth restorations

Question 10

What’s the direct technique in crown fabrication ?

Answer 10

1. Based on existing tooth morphology, using a rigid and dimensionally stable impression material,before tooth preparation
2. Based on envisaged tooth morphology from the diagnostic wax-up using a vacuum-formed thermoplastic matrix Pre-formed metal or plastic shell crowns