FPD Provisional Restorations Flashcards
What is used as a representation of the definitive restoration form, creates outer contour, and is determined at the diagnostic stage?
External Surface Form (ESF)
The _______ Surface Form represents prepared hard and soft tissue that receive the restoration and determines the internal contour.
Tissue (TSF)
What is the number one problem or concern with placement of provisional materials in the patient?
Heat generation via polymerization reaction
Heat generated by _______ materials (Jet), reach a higher temperature than vinyethylmethacrylate (Trim) or Bis-GMA materials.
Methylmethacrylate (PMMA)
Which materials produce the highest exothermic reaction temperatures?
PMMA (polymethyl methaacrylate)
A small amount of resin ______ will result in poor proximal contacts.
shrinkage
In a clinical setting, what must be a consideration prior to direct provisional fabrication?
Monomer allergies and chemical burns
What constitutes an “ideal” preparation?
- Proper reduction
- POW
- Clean margins
Overcontouring and inadequate marginal adaptation will contribute to ______ _____ and an unhealthy periodontium.
plaque accumulation
What is the powder to liquid ratio for Trim (Polyvinyl ethylmethacrylate)?
Powder 2: Liquid 1
The ESF should be filled up to the _____ level of the prepared teeth.
Cervical
True or False: After filling the ESF with Trim, the surface gloss disappears and indicates that it is ready to seat on the arch.
TRUE.
Jet does not work this way, however
When the resin reaches a _______ stage, move the ESF occlusally about _____ and place it back on the teeth.
doughy
2mm
What is the purpose of “pumping” the ESF up once it reaches the doughy stage?
Break the seal of resin on gingiva and teeth (typodont)
AVOID THERMAL INJURY (clinic)
After marking margins and contact on the resin, gross excess should be trimmed using ________.
Acrylic burs
Use _____ with correct angulation when approaching margins and use external tooth surface as a guide.
Sand discs
What is the most commonly used pontic design?
Modified Ridge Lap
For a modified ridge lap design, mark the pontic so that you are only trimming the _____ half.
Palatal
A hygienic pontic must float _______ above the gingiva.
1-2mm
large end of ball-burnisher is ideal 1.5mm
Hygienic pontics are used in the _______ arch and in more ______ regions.
Mandibular
Posterior
Connectors should be no less than ______ thick buccolingually.
3 mm
Vertical dimension of connectors should be ______ occlusocervically.
3-4mm
The cervical embrasure should be no more than _____.
1 mm
The “ridge lap” pontic should lightly touch the _______ and have a _______ tissue surface.
Alveolar ridge
Convex
