152 P21-1Trigeminal and other nerves histopathologic findings of the regenerated nerve segments were studied. Gross examination revealed tubular structures with regen- erated nerve bundles. Fibrovascular collagenous interfaseicu- lar tissue was more abundant in the 16-weeks-group than in 8- weeks-group. Electron microscopic examination after 16 weeks disclosed more organized nerve structures than after 8 weeks. Creating a tube with e-PTFE membrane for a nerve gap can be a good option to restore nerve injury in the mandibu- lar canal. 10. An Experimental Study of Tubulizafion of Inferior Alveolar Nerve Defects with Artificial Materials, Second report YamagucM, S.-L, Aroma, H., Sasaki, K.-L, Takasaki, Y, Fjikawa, M. The First Department of Oral and Maxillofacial Surgery, Tokyo Dental College, Tokyo, Japan To treat nerve defects resulting from injury or tumorectomy involving the mandibular/facial region, autogenous free nerve grafting with the great auricular nerve or sural nerve is performed in current clinical practice. However, this repair requires anothe/operation to obtain a donor nerve and sac- rifices the functions of the territory under the control of that second nerve. Since 1982, we started studies of lyophilized nerve grafting as an allograft and observed regeneration of the nerve morphologically and physiologically. However allografting has a few immunological clinical problems. In this experiment, the inferior alveolar nerve of Japanese white rabbits is resected 10mm in length and tubulized with polyether alcohol tubes under the operative microscope. The other side of the inferior alveolar nerve was tubulized with sili- cone tubes. The tubulized materials were extracted 4, 8, 12 and 16 weeks and we observed time-dependent regeneration of the inferior alveolar nerve under an optical microscope. 11. Multidimensional Evaluation of Pain in Various Dental Diseases and Examination of Pain Expression Terms Kino, K. l, Sugisaki, M. z, Ito, H. 1, Amagasa, T.l, Tanabe, H. z, Suzuki, PC.. 3, Shiina, iV.. 4, Beppu, S. 5, Suda, H. 6 llst Department of OMS, Tokyo Medical and Dental Univ., 2Department of Dentistry, Jikei Univ. of Medicine, 3Department of Oral Anesthesiology, Tokyo Medical and Dental Univ., 43rd Department of Oral Prosthodontics, Tsurumi Univ., SDepartment of Oral Anesthesiology, Tsurumi Univ., 6Department of Endodontology, Tokyo Medical and Dental Univ., Tokyo, Japan The examination and evaluation of pain in various dental deseases were performed using the Japanese version of the McGill Pain Questionnaire (JMPQ). The patient group was composed of 10 disease groups: pulpitis and apical periodontitis, pain after exodontia, tem- poromandibular disorders, inflammation, lichen planus, tri- geminal neuralgia, denture stomatitis, malignant tumor, atypical facial pain, and trigeminal paralysis. The atypical facial pain group selected the most ex- pression terms. However, the multiple comparison test for the intensities of pain revealed that the pulpitis and apical periodontitis group and the trigeminal neuralgia group se- lected the most intensive expressions. In order to make the specific term clear in the disease groups respectively, a logistic regression analysis was per- formed. The specific expression terms for the disease were decided to be those selected by more than 20% patients and of which the ratio in the logistic regression analysis were a factor of 2.0. The results were as follows: "swelling" and "aching" for the pulpitis and apical periodontitis group, "tender" for the pain after exodontia group, "tugging" and "throbbing" for the TMD group, "aching" for the inflam- mation group, "tingling," "unbearable" and "jien" (in Ja- panese) for the lichen planus group, "pricking" and "bien" (in Japanese) for the trigeminal neuralgia group, "crushing" for the denture stomatitis group, "tender" for the malignant tumor group, "itchy," "tingling" and "sickening" for the atypical facial pain group and "piri piri" (in Japanese) and "tugging" for the trigeminal paralysis group. 12. Muscle Afferent Block by Intramuscular Injection of Lidoeaine for the Treatment of Oromandibular Dystonia Yoshida, K. m, Karl, R. 1, Kubori, T. l, Kohara, N. 1, lizuka, T. 2, Kimura, j.1 1Department of Neurology, 2Department of OMS, Faculty of Medicine, Kyoto University, Kyoto, Japan Oromandibular dystonia is a neurologic disorder that affects the mastieatory and tongue muscles, resulting in spasms due to repetitive, tonic or involuntary movements. We treated 16 patients with oromandibular dystonia by intramuscular injection of lidocaine and alcohol for muscle afferent blocking. Their symptoms had been resistant to other therapeutic modalities, such as pharmacotherapy or dental treatment. Five to 10 ml of 0.5% lidocaine was in- jected at one site using a hollow electromyographic needle for guidance and injection with a standard instrument (Vi- king IV, Nicolet Biomedical, Madison, WI). The initial injec- tion contained lidocaine alone, and 99.5% ethanol was added to the lidocaine at a one to ten volume ratio at the same needle site in later sessions. The muscles for injection were chosen from the masseter, the inferior head of the lat- eral pterygoid muscle, the medial pterygoid muscle, tongue muscle, the anterior belly of the digastric muscle, the trapez- ius muscle and the sternocleidomastoid muscle. All patients showed clinical improvement after this therapy, and the over- all subjective improvement was 64.6 (mean)+21.6% (stan- dard deviation). The mean response of the jaw elevator muscles (73.1+ 10.3%) was higher than that of the depressor muscles (54+-29.9%). The results may be due to the differ- ence in the numbers of muscle spindles supplying the masti-