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Overview of the testing set-up. Sensor 1 (rotating tooth carrying different attachment design, seen on the right) and Sensor 2 (stable base model, left) in action. Each aligner corresponding to the specific attachment was mounted in the “test position” which was reproduced for all tests by the same FSI software coordinates. The three axes: X: long axis of the tooth; Y: mesio-distal axis; and Z: bucco-lingual axis are represented for intelligibility.
