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A “Compound Move” is when an aligner performs both a vertical correction by shimming and a horizontal correction by moving a MTBM (movable machine) simultaneously.
Traditionally, during the alignment process, after a rough alignment is made, the aligner will shim the movable machine until it is within the vertical alignment tolerance. Once within vertical tolerance, the aligner will then make the horizontal correction. Sometimes this will result in several moves until the tolerance is reached for both vertical and horizontal.
The “Compound Move” has been used successfully by many aligners for 20+ years. The success of making a vertical and horizontal correction simultaneously is dependent on when to perform this step.
The following steps should be performed before making a Compound Move:

  1. All pre-alignment checks and corrections completed.
  2. Rough align the MTBM.
  3. Perform Rough (Initial) Soft Foot.
  4. Perform Final Soft Foot.
  5. Now, perform the Compound Move and you will find that many times, you will complete the final alignment in just one or two moves.

The benefit of performing a Compound Move is saving time.

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, by Pedro Casanova CRL