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. 2020 Aug 1;42(1):24. doi: 10.1186/s40902-020-00269-0

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© The Author(s) 2020

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Fig. 2 — Bilateral ear-rods made according to the cephalogram. The head position is defined using the ear rod and guide beam (arrow). Scanning with ear-rods helps to define the position of the head (parallelism) and makes STL data creation easier