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. 2020 Jun 5;20:165. doi: 10.1186/s12903-020-01145-z

Fig. 1.

Fig. 1

Photograph of the patient’s face with cheek retractors in place. The picture wsd taken with semi-disclosed dental arches, to correctly evaluate the parallelism between the bi-pupillary line and occlusal planes as well as and the congruence between the median and interincisive lines