Fig.4: A good preop PA should be able to show the relationship of the root of the lower right 2nd premolar with the mental nerve loop.

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