63 - bridge restoration accoridng to "Adapta" system

sections

• when is it used?

• pouring sectional plaster model (working cast with removable dies)

• Foil adaption with adjustment

• retainers modelling (wax up)

• pontic modelling (wax up)

• when is it used?

When defect in the dental arch is detected; 2 abutment teeth and we have to make a bridge restoration here.

• pouring sectional plaster model (working cast with removable dies)

• Impression Filling:
  Fill the impression (taken from the patient) with blue or pink die stone. Let it partially harden.

• Placing Pins:
  Insert pins into the areas marked for abutment teeth. Place retention devices (e.g., staples) between pins.
  Pins must be parallel and level.

• Base Formation:
  Once fully hardened, isolate around the pins and add gypsum on top and beside the model.

• Creating the Key:
  Flip the model, add more gypsum to form a key behind the distal teeth at masticatory level.
  Remove excess gypsum before it hardens. Isolate the key.

• Final Layer:
  Apply gypsum on the second half of the impression and over the key. Trim the model to shape it

• Drying and Sectioning:
  Let the model dry completely before cutting the abutment teeth with a saw.
  Cuts must be parallel or slightly divergent.

• Die Preparation:
  Remove dies and shape them using a handpiece.
  Make the dies cylindrical with a 0.5 mm horizontal platform at the margin.
  Mark the preparation margin with a pencil.

• Foil adaption with adjustment

• Heating the Foils:
  Use clasps to hold the foils over a spirit lamp flame to soften them.
  Place the thin (distance) foil over the thick (base) foil, with the thick side facing the flame.
  Heat until transparent—avoid burning yourself or the foils.

• Shaping the Foils:
  Place the softened foils over a silicone-filled cup.
  Press the abutment die into the foils so they mold to its shape.
  The thin foil will be inside (touching the die), and the thick foil on the outside.

• Trimming the Foils:

  • Thick (base) foil: cut 0.5–1 mm above the preparation margin.

  • Thin (distance) foil: cut 1.5–2 mm above the preparation margin.

• Applying Cervical Wax:
  Fill the gap between the foils and the preparation margin with red cervical wax (0.5 mm thick).
  Remove excess wax from the vestibular surface and incisal edge only.

• Removing the Thin Foil:
  After shaping, remove the thin foil (distance foil).
  It must be removed before casting to avoid carbon contamination that can affect the final restoration’s aesthetics.

• retainers modelling (wax up)

• do wax up with blue wax

• must shape masticatory surface, approximal contacts and equator so that it is size and shape of normal crown

pontic modelling (wax up)

• cut small piece of blue wax and place it in between two retainers and shape so it looks like normal crown

• must have contacts w3ith retainers and free space for marginal gingiva

• pontic profile - tangential (semi-hygienic aesthetic). Must be minimal distance between lower surface of pontic and alveolar ridge