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Module 6 - Fixed Pros > Provisional Restorations > Flashcards

Provisional Restorations Flashcards

1
Q

5 methods of providing a PROVISONAL restoration?

A
  • Pre-operative putty impression.
  • Pre formed crown.
  • Pre-operative wax up followed by duplication and a vacuum formed stent.
  • Free-hand bis-acrylic resin.
  • Use the old crown if there is one.
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2
Q

5 functions of a provisional restoration?

A
  • Protect the pulp from mechanical, thermal, electrical and chemical trauma.
  • Maintain the position of the tooth in occlusion.
  • Maintain the periodontal health of the tooth.
  • Restore the aesthetic appearance of the tooth.
  • Protect any root canal filling from CORONAL LEAKAGE.
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3
Q

4 materials a preformed crown can be made of?

A
  • Polycarbonate
  • Cellulose-acetate.
  • Composite
  • Metal
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4
Q

4 steps to the putty impression provisional crown technique WITH modification.

A
  1. Make PRE-OP MODELS in stone with WAX REGISTRATION of bite.
  2. Technician does a WAX UP to improve the SHAPE and AESTHETICS of the teeth.
  3. The wax up can be DUPLICATED in STONE and a VACUUM FORMED STENT MADE.
  4. STENT/MOULD used after crown preparation to make PROVISONAL CROWNS
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5
Q

What can the vacuum stent mould made in the modified putty impression technique be used for other than providing provisional crowns?

A

Can be used PRIOR to crown preparation to make COMPOSITE ADDITIONS to the teeth.

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6
Q

What material goes into the pre-operative putty/ the stent?

A

chemically cured bis-acrylic composite resin

protemp, integrity

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7
Q

Which preformed crowns are most commonly used?

A

POLYCARBONATE crowns (directa)

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8
Q

What is added into polycarbonate crowns prior to cementation?

A

a COLD CURE ACRYLIC RESIN (ex. TRIM).

It is a pema

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9
Q

3 benefits of trim?

A
  • bonds to crown.
  • does not fall apart when trimmed.
  • can be polished.
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10
Q

3 tips on manipulating trim?

A
  • Lift slightly off the preparation at initial set to pull over any undercuts.
  • Do not fully remove until almost set (otherwise will not go back on)
  • Acrylic burs more effective at cutting than abrasive discs.
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11
Q

what is used to cement temporary polycarbonate crowns in place?

A

TEMPORARY LUTING CEMENT (EX. tempbond).

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12
Q

9 Steps to the provision of a temporary cellulose acetate crown?

A
  • Cut to size with crown shears
  • Perforate incisal corner to let out trapped air
  • Fill with ProTemp
  • Place over prep and allow to cure
  • Remove from prep
  • Remove cellulose acetate
  • Polish margins
  • Check occlusion
  • Cement
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13
Q

What is used to fill the cellulose acetate crown?

A

PROTEMP

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14
Q

Why are metal provisional crowns not encouraged?

A

Poor margins that form PLAQUE TRAPS

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15
Q

5 steps to providing a provisional metal crwown?

A
  • Select.
  • line with Protemp.
  • Check margins
  • Check occlusion
  • cement with temporary luting cement (tempbond).
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16
Q

Technique to provide a temporary bridge when the abutment tooth is prepared and there is no pre-operative putty without using the lab (6)?

A
  • Mould some soft wax over the abutment and gap.
  • make a putty index over the wax.
  • Place protemp into the putty and place over the tooth.
  • Trim up the protemp temporary bridge.
  • Check the occlusion .
  • Polish and fit with temporary luting cement (tempbond)b
17
Q

When is a pre-operative wax up followed by duplication and a vacuum formed stent used?

A

When making temporary restorations for MULTIPLE TEETH and wanting to CHANGE OCCLUSION or GUIDANCE.

18
Q

Technique to provide a temporary bridge when the abutment tooth is prepared and there is no pre-operative putty WITH using the lab (9)?

A

aka post-operative wax up followed by duplication and vacuum formed stent.

  • Take an impression.
  • Technician makes the wax.
  • Technician duplicates the cast.
  • Technician makes a vacuum formed stent.
  • Fill stent with tprotemp.
  • Trim
  • Check occlusion
  • Polish
  • Cement with temporary luting cement (Protemp).
19
Q

When is a free hand bis-acrylic resin temporary restoration used?

A

As a LAST RESORT as it requires A LOT OF TRIMMING and is VERY TIME CONSUMING.

20
Q

2 diagnostic benefits of provisional restorations?

A

Help check for UNDERCUTS ON CROWN:
- will not withdraw from preparation.
- rstoration will tear as it is withdrawn.

Help check if prep is ADEQUATELY REDUCED:
- did you cut through the provisional crown when checking the occlusion.
- is the provisional crown less than 0.5mm thick?

21
Q

why do we make our provisional restoration before taking our final impression?

A
  • Provisional restoration tells us if CROWN PREP IS UNDERCUT.
  • Tells us if prep is ADEQUATELY REDUCED.
22
Q

When do we make our provisional restoration?

A
  • AFTER the tooth preparation (to check the tooth preparation is satisfactory)
  • BEFORE the impression (so you can modify the preparation BEFORE the impression is taken.
23
Q

3 THERAPEUTIC benefits of provisional restorations?

A
  1. improve PERIODONTAL health.
  2. improve SEECH DIFFICULTIES.
  3. improve AESTHETICS (+ confirm patient is happy with aesthetics).

Module 6 - Fixed Pros (8 decks)

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