In the first sequence of aligners we closed the space without worrying about the black triangle that would arise between 1.1 and 2.1
This space was due to the dental shape and the bone defect in the area between the teeth
The aim was to observe the gingival height gain, and then to program a second sequence of aligners to require a minimum of IPR.
In the second sequence of aligners an IPR of 0.7 mm was programmed between 1.1 and 2.1, however, we did only 0.5 mm to ensure a strong contact point between 1.1 and 2.1.
To avoid IPR in the lower arch, spaces were left in the distal region of 2.2 and 1.2 for posterior aesthetic restorations.
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