砄bjective: To summarize the clinical characteristics of basal cell nevus syndrome (BCNS) and the treatment experience of cysts in jaws. Methods: 24 patients of BCNS from Mar. 1981 to Sept. 1999 were retrospectively investigated. Results: Of all the cases, the mean age for the first examination was 17 years old. The respective incidence of the main symptoms were multiple nevi in 9 cases (37.5%), palmar and/or plantar pits in 7 (29.2%), spine and/or ribs deformity in 17 (70.8%), intracranial calcification in 19 ( 79.2% ), specific facial profile in 16(66.7%). The cysts of jaws were the main causes for early examination, which were characterized by their multiple and preadolescent occurrences. The cysts were surgically removed and the postoperative recurrence rate of the cysts was 22.0%. Conclusion: Much attention should be paid to the cysts of jaws, the main symptoms, and cause of the physiological and psychological impairment in the patients of BCNS.

Objective: To study the difference between the facial nerve injury by gun-shot and that by blast. Methods: 40 adult dogs were divided into 2 groups, with 20 dogs in each. In the blast group, the impact wave was simulated by detonator blast in the distance of 10 cm over the dog's masseter. At the same time,a steel ball was projected to the dog's face by a rifle to imitate segments in blast. In the gun-shot group, only the steel ball was used. Then the facial nerve was taken at the time of immediateness, 6 hours, 1 day, 3 days and 7 days following the injury for HE or immunocytochemical staining. And the facial nerve conduction velocity was examined 6 hours, 3 days and 7 days after injury.Results: The facial nerve edema was found in both groups just after injury. There was scattering hemorrhage and little hematoma below the spineurium in the gun-shot wound, as well as the diffusing bleeding and larger hematoma in blast wound. In the blast group, the severe edema could be found by light microscope in the whole extracranial facial nerve. Axonal fragments, infiltrating imflammatory cells and few neurofilament protein NF positive axons were observed. In the gun-shot group, only scattering damage was found within 2 cm from the wound track.Conclusion: The facial nerve injury by gun-shot bacomes less severe with the increase of distance from the wound track, but the blast injury is wider and more severe.

Objective:To analyse the methord and effects of intermaxillary traction(IMT)screws used in the treatment of jaw frac-ture.Methods:In the treatment of 1 68 cases of jaw fracture IMT screws were used for the restoration of normal and stable occlusion. The screw number,position,traction effect and postoperative complications of the treatment were analysed.Results:705 screws were used in 168 patients,4 screws were used in each of 147 cased (88%),6 in 12(7%),5 in 9(5%).336(47.7%)screws were fixed between the roots of first and second premolar,292(41 .4%)between the roots of canine and first premolar,50 (7.1%)be-tween the roots of second premolar and first molar,27(3.8%)between the other tooth roots.Normal postoperative occlusion relation was achived by the use of screws in 92 cases without traction.Occlusion disharmony or deviation was found in 76 cases by the used of screws and was restored to normlal by 1 4-day traction in 71 cases.The total efficiency of the treatment was 97%.Pain of the mucosa surrounding the screws was observed in 23 cases (1 3.7%).Root damage,traction screw loosening and adjacent tooth dislocation were observed in 1 3(1 .8%),1 1 (1 .6%)and 2(0.3%)cases respectively.Conclusion:For the fixation of IMT screws,the posi-tions between tooth root from canine to first molar were most common and safe.The fixation point should be in 5 ~8mm below the gin-gival margin.Use of 4-6 screws can meet treatment need.

Objective:To study the effects of the surgical treatment of nerve avulsion inside and outside the mandibular cannel.Methods:34 patients with trigeminal neuralgia of the third division,received neurotomy and avulsion of inferior alveolar nerve in the mandibular cannel above the lingual or through the mental foramen,concurrently with the avulsion of buccal nerve.Patients were fol-lowed up for 2-4 years.Results:All the operations were successfully completed,The wounds were well-healed.All patients felt that pain disappeared in the area innervated by inferior alveolar nerve.During the 2-4 years of follow-up,no recurrence was found.Conclusion:Inferior alveolar nerve neurotomy and avulsion in the mandibular cannel is simple,safe and effective in the treatment of trigeminal neuralgia of the third division.

Objective:To analyse the effects of mandibular swing approach in the treatment of the tumors in infratemporal fossa. Methods:11 patients with tumors in infratemporal fossa treated by the surgical operation with mandibular swing approach. The mandi-ble cut was at the front of foramina mentale in 5 cases, at the front of mandible angle in 4 cases and at the middle of chin in 2 cases re-spectively. Results:According to the nature, location, size and the relationship of the tumors with peripheral nerve and blood vessels, flexible selection of the position of mandibular cut could fully expose and completely remove the infratemporal fossa tumor. Conclusion:Surgical treatment of the tumors in infratemporal fossa by mandibular swing approach is safe and effective.

Objective To determine ecdysterone content in Radix Achyranthis Bidentalae by near-infrared diffuse reflectance spectroscopy (NIRDRS) combined with partial least squares (PLS). Methods NIRDRS and PLS. Results The correlation coefficient of the quantitative mathematics model between the prediction and the true values was 0.948 9. It is feasible to appling the above established method to determination of chemical constituents in Chinese materia medica. Conclusion Compared with other methods, the method is simple, rapid, high efficient, low expenditure, no pollution and with preparation undone and is suit for large quantity of unknown samples.