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. Author manuscript; available in PMC: 2015 Jun 13.
Published in final edited form as: Otolaryngol Head Neck Surg. 2014 Jan 27;150(4):638–645. doi: 10.1177/0194599813519747

Figure 8.

Figure 8

CT scan of Specimen 4. The large air cell present during the transition from the wide to thin drill bit may have caused the thin drill bit to deviate on hitting the hard bone surface.