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The purpose of this study was to confirm the length and kind of donor nerves used in nerve grafts for reconstruction of inferior alveolar nerve defects. The authors conducted a retrospective study of surgeries that were performed between 1977 and 1996. A total of 20 patients underwent nerve grafting procedures during this period. The greater auricular nerve was selected as the donor nerve in 16 cases, while the sural nerve was selected in 4. Mean lengths of donor nerves were 7.28 ± 1.6cm and 11.5 ± 3.4cm for the greater auricular and sural nerves, respectively. As indicated, the sural nerves were significantly longer (p<0.01). Mean lengths of donor nerves grafted for partial resection and hemi-mandibulectomy were 7.23 ± 1.6cm and 10.8 ± 3.4cm, respectively. Statistical analysis indicated that grafts used in the hemi-mandibulectomy group were significantly longer (p<0.05). In terms of types of donor nerve used in mandibulectomies, the greater auricular nerve was used in the majority of partial resections, and the sural nerve was employed for hemi-mandibulectomy.