Infrazygomatic mini-implant penetration into the maxillary sinus

We read with interest the article "Influence of orthodontic mini-implant penetration of the maxillary sinus in the infrazygomatic crest region" in the May 2018 issue of the AJO-DO,1 and we believe that this topic is relevant for current orthodontic practice. We want to point out some misunderstandings in the methodologic section and conclusions.

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