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In fact no paresthesia is reported by the patient the following morning. It is possible that lingual implant placement (Fig.7 green area) avoids violation of the mental loop (Fig.3 L). The overlapping mentioned above may be caused by angulation of X-ray projection (Fig.7 arrow).
In contrast, straight placement is more likely associated with mental loop injury (Fig.8). Paresthesia is present in this case.
Xin Wei, DDS, PhD, MS 1st edition 03/20/2015, last revision 03/21/2015