Affixing the Bases to the Maxillary Cast

• Place the assembled record bases on the maxillary cast
  
• Seal the bases in place with small amounts of baseplate wax

Seating and Affixing the Mandibular Cast

To seat and affix the mandibular cast to the record base, the operator will:

• Seat the mandibular cast
  
• Seal it in place on the record base
  
• When the mandibular cast cannot be seated correctly onto its record base without contacting the maxillary cast, carefully reduce the land area with a lab knife
• Close the articulator to ensure that at least 3 mm clearance exists between the inferior surface of the mandibular cast and the mandibular mounting ring. If this is not so, the undersurface of the mandibular cast must be adjusted until sufficient clearance is achieved. Care may need to be taken to avoid accidentally perforating the cast in the greatest depths of the lingual vestibules.

Mounting the Mandibular Cast

To mount the mandibular cast, the operator will:

• Notch the undersurface of the mandibular master cast, taking care not to perforate it, especially when the patient's mandible is severely resorbed.
  
• Moisten the base of the cast
  
• Place a thin mix of impression plaster in the retentive slots on the mounting ring
  
• Place a small mound of plaster on the base of the cast