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. 2017 Mar 20;18:8. doi: 10.1186/s40510-017-0162-4

Fig. 3.

Fig. 3

Altered black triangles between the maxillary central incisors in 0.5-increments. 1 no black triangle; 2 0.5 mm; 3 1.0 mm; 4 1.5 mm; 5 2.0 mm; and 6 2.5 mm