Apparatus for constructing registered teeth castings

A dental tray for holding impression material, said dental tray being adapted to simultaneously obtain registered upper and lower dental impressions, comprising:

• a first U-shaped peripheral retaining wall;
• first dividing means, said first dividing means being attached to one of the U-shaped edges of said first wall, said first dividing means and first wall combination comprising an upper tray section;
• a second U-shaped peripheral retaining wall;
• second dividing means, said second dividing means being attached to one of the U-shaped edges of said second wall, said second dividing means and second wall combination comprising a lower tray section, said upper and lower tray sections being operatively movably placed back-to-back so that said first and second dividing means are in contact with each other,
• said first and second dividing means being non-porous and deformable when bitten to conform to the contours of the biting surfaces without tearing or perforating while at the same time maintaining the deformed relationship after the biting surfaces are removed, said respective dividing means being thin enough to allow all upper and lower teeth to come to full occlusion, the attachment of said dividing means to the respective U-shaped walls combined with the rigidity of the respective dividing means being sufficient to enable said dividing means to support impression material contained in the dental tray;
• means adapted to maintain said upper tray section in position with respect to said lower tray section once they have been positionally adjusted with respect to each other;
• a handle secured to the anterior portion of the U-shaped wall of at least the one tray section adapted to receive overbiting or underbiting teeth, whereby impressions of teeth having overbite or underbite characteristics are obtained without said handle interfering with proper registration;
• and
• a cavity formed in at least one tray section adjacent the anterior portion of the U-shaped peripheral retaining wall, said cavity extending below the plane of the dividing means of at least one tray section to accommodate a gross overbite or underbite condition.