Fig.4': A good preop PA should be able to show the relationship of the root (R) of the lower right 2nd premolar with the mental nerve loop (red dashed line: upper border).

This PA may be tilted, since preop panoramic X-ray shows that there is clearance between the root tip and the mental loop.

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Xin Wei, DDS, PhD, MS 1st edition 05/31/2013, last revision 06/01/2014