J N Walton1. 1. University of British Columbia, Vancouver, B.C., Canada. jnwalton@unixg.ubc.ca
Abstract
STATEMENT OF PROBLEM: Reported incidences of altered sensation after placement of mandibular implants range from a low of 0% to almost 44%, making it difficult to advise subjects regarding risk. PURPOSE: This study involved presurgical and postsurgical assessment of sensation in the lips and chins of 75 subjects, all of whom objectively demonstrated normal sensation before surgery. MATERIAL AND METHODS: Objective and subjective tests were administered before, and at planned intervals for 12 months after, the placement of 2 implants in the anterior mandible. RESULTS: Objective changes were observed in only 1 subject and then only at the 2-week postsurgery interval. There were significant differences for all subjects in subjective sensation changes from baseline to 2 weeks after surgery (P =.007) and from 2 weeks to 6 months (P =.003) or 12 months (P =. 003). There was a higher percentage of subjects with normal sensation before surgery who reported sensory changes 2 weeks after implant placement (34% vs 24% for all subjects), but only 1% of subjects still reported altered sensation 1 year later. Although there were no significant differences between men and women in reports of altered sensation, more women than men noted sensation changes 2 weeks after implants were placed (25% vs 13%). There appeared to be no relationships among gender, the degree of ridge resorption, and reports of altered sensation. CONCLUSION: Thus, although approximately 24% of subjects may report altered sensation in the short-term after implant surgery in the anterior mandible, the problem appears to be a transient one, with only about 1% experiencing sensation changes 1 year after implant surgery.
STATEMENT OF PROBLEM: Reported incidences of altered sensation after placement of mandibular implants range from a low of 0% to almost 44%, making it difficult to advise subjects regarding risk. PURPOSE: This study involved presurgical and postsurgical assessment of sensation in the lips and chins of 75 subjects, all of whom objectively demonstrated normal sensation before surgery. MATERIAL AND METHODS: Objective and subjective tests were administered before, and at planned intervals for 12 months after, the placement of 2 implants in the anterior mandible. RESULTS: Objective changes were observed in only 1 subject and then only at the 2-week postsurgery interval. There were significant differences for all subjects in subjective sensation changes from baseline to 2 weeks after surgery (P =.007) and from 2 weeks to 6 months (P =.003) or 12 months (P =. 003). There was a higher percentage of subjects with normal sensation before surgery who reported sensory changes 2 weeks after implant placement (34% vs 24% for all subjects), but only 1% of subjects still reported altered sensation 1 year later. Although there were no significant differences between men and women in reports of altered sensation, more women than men noted sensation changes 2 weeks after implants were placed (25% vs 13%). There appeared to be no relationships among gender, the degree of ridge resorption, and reports of altered sensation. CONCLUSION: Thus, although approximately 24% of subjects may report altered sensation in the short-term after implant surgery in the anterior mandible, the problem appears to be a transient one, with only about 1% experiencing sensation changes 1 year after implant surgery.