The purpose of this article was to evaluate whether neurosensory disturbances such as impaired sensitivity of the lower lip and chin influence patients' final evaluation of the treatment result. Information about the patients' degree of satisfaction and about lip and chin sensivity were obtained from final follow-up doctuments of 215 patients. All patients had undergone sagittal split ramus osteotomy for mandibular advancement. In patients with normal sensitivity on both sides of the lower lip and chin, the degree of satisfaction was equally distributed at a very high level through all age groups. Among those with some degree of numbness on either or both sides of the lower lip and chin, patients in the younger quarter and middle half of the group were as satisfied as those with normal sensitivity, while those in the oldest quarter with impaired sensitivity demonstrated a lower degree of satisfaction than the rest of the patients. Although the difference was not statistically significant, the finding strongly indicates that older patients seem to suffer more from neurosensory disturbances than do younger patients with similar conditions.