FPD Provisional Restorations

Question 1

What is used as a representation of the definitive restoration form, creates outer contour, and is determined at the diagnostic stage?

Answer 1

External Surface Form (ESF)

Question 2

The _______ Surface Form represents prepared hard and soft tissue that receive the restoration and determines the internal contour.

Answer 2

Tissue (TSF)

Question 3

What is the number one problem or concern with placement of provisional materials in the patient?

Answer 3

Heat generation via polymerization reaction

Question 4

Heat generated by _______ materials (Jet), reach a higher temperature than vinyethylmethacrylate (Trim) or Bis-GMA materials.

Answer 4

Methylmethacrylate (PMMA)

Question 5

Which materials produce the highest exothermic reaction temperatures?

Answer 5

PMMA (polymethyl methaacrylate)

Question 6

A small amount of resin ______ will result in poor proximal contacts.

Answer 6

shrinkage

Question 7

In a clinical setting, what must be a consideration prior to direct provisional fabrication?

Answer 7

Monomer allergies and chemical burns

Question 8

What constitutes an “ideal” preparation?

Answer 8

• Proper reduction
• POW
• Clean margins

Question 9

Overcontouring and inadequate marginal adaptation will contribute to ______ _____ and an unhealthy periodontium.

Answer 9

plaque accumulation

Question 10

What is the powder to liquid ratio for Trim (Polyvinyl ethylmethacrylate)?

Answer 10

Powder 2: Liquid 1

Question 11

The ESF should be filled up to the _____ level of the prepared teeth.

Answer 11

Cervical

Question 12

True or False: After filling the ESF with Trim, the surface gloss disappears and indicates that it is ready to seat on the arch.

Answer 12

TRUE.

Jet does not work this way, however

Question 13

When the resin reaches a _______ stage, move the ESF occlusally about _____ and place it back on the teeth.

Answer 13

doughy

2mm

Question 14

What is the purpose of “pumping” the ESF up once it reaches the doughy stage?

Answer 14

Break the seal of resin on gingiva and teeth (typodont)

AVOID THERMAL INJURY (clinic)

Question 15

After marking margins and contact on the resin, gross excess should be trimmed using ________.

Answer 15

Acrylic burs

Question 16

Use _____ with correct angulation when approaching margins and use external tooth surface as a guide.

Answer 16

Sand discs

Question 17

What is the most commonly used pontic design?

Answer 17

Modified Ridge Lap

Question 18

For a modified ridge lap design, mark the pontic so that you are only trimming the _____ half.

Answer 18

Palatal

Question 19

A hygienic pontic must float _______ above the gingiva.

Answer 19

1-2mm

large end of ball-burnisher is ideal 1.5mm

Question 20

Hygienic pontics are used in the _______ arch and in more ______ regions.

Answer 20

Mandibular

Posterior

Question 21

Connectors should be no less than ______ thick buccolingually.

Answer 21

3 mm

Question 22

Vertical dimension of connectors should be ______ occlusocervically.

Answer 22

3-4mm

Question 23

The cervical embrasure should be no more than _____.

Answer 23

1 mm

Question 24

The “ridge lap” pontic should lightly touch the _______ and have a _______ tissue surface.

Answer 24

Alveolar ridge

Convex