RESULTS	The results showed that on the computer-assisted SSRO sides , patients had lower postoperative abnormal thresholds for the Semmes-Weinstein monofilaments on lower lip and chin ( p < 0.05 at 3months ) and for the two-point discrimination on lower lip ( p < 0.05 at 1week ) and chin ( p < 0.05 at 6months ) , with fewer abnormal self-reported changes in lower lip sensation ( p < 0.05 at 1week ) after surgery .\