AIM: To study the possible role of nitric oxide (NO) in the development of periodontitis and the relationship between the NO concentration and the attachment loss. METHODS: Seventy- two Sprngue- Dawley rats were randomly assigned to two groups, the control group and periodontitis group. Experimental periodontitis in rats was produced by a ligature of braided silk. The nitric oxide concentration was indirectly ascertained by the concentration of nitrite (NO2-) and nitrate (NO3-)in the gingival tissue, which was assayed by spectrophotometry. The attachment loss (AL) was measured by the technology of the cellular graphics engineering research. The histopathologic change in periodontium was observed under a light microscope by using the histotomy. RESULTS: Compared to control group, the NO2-/NO3 - concentration in gingival tissue was significantly higher in periodontitis group at four weeks and eight weeks following ligation (P＜0.01). In periodontitis group, the NO2-/NO3 - concentration in gingival tissue was higher at eight weeks than that at four weeks following ligation (P＜0.01). At four weeks and eight weeks, the AL in experimental periodontitis in rats was significantly increased than that at one week after ligation ( P＜0.01); and the AL was also much higher at eight weeks than that at four weeks (P＜0.01). CONCLUSIONS: The NO2-/NO3- concentration in the gingival tissue in periodontitis group was significantly higher than that in control group. These results demonstrate that the NO2-/NO3- concentration is related to the severity of AL, and NO synthesis is very important to the process of inflammation and lesion in periodontium. Reducing NO production may be of great therapeutic value in the treatment of periodontitis.

AIM: To study the effect of local application of indomethacin on acute pulpitis. METHODS: Traumatic pulpitis model in rats was established by means of pulp exposure, radioimmunoassay (RIA) was used to measure the kinetic changes of the levels of PGE_2、6-keto-PGF_~1? and TXB_2 of pulpal tissues. RESULTS: Local application of indomethacin could more effectively inhibit the cyclo-oxygenase pathway than zinc oxide engenol in the early stage of pulpitis and reduce the production of prostaglandins. CONCLUSION: Local application of indomethacin may have a therapeutic effect on acute pulpitis. [

Objective:To explore the curative effect and safety of unilateral radical thyroidectomy via axillary approach endoscope without air insufflation.Methods:The clinical data of 80 patients with unilateral thyroid cancer in Huaibei People's Hospital in Anhui Province from June 2017 to June 2019 were retrospectively analyzed. The patients were divided into the control group (40 cases) and the observation group (40 cases) according to the surgical method. The observation group was treated with unilateral radical thyroidectomy via axillary approach endoscope without air insufflation, and the control group was treated with open surgery plan. The dissection number of lymph nodes in the central area, the time of flap separation and cavity establishment, the total operation time, the drainage volume and the days of hospital stay in patients of two groups were recorded, and the postoperative complications were evaluated and recorded. The neck and chest pain of patients were investigated with visual analogue scoring method (VAS) at 3 days, 1 month and 3 months after surgery. The white blood cell count (WBC), interleukin 6 (IL-6) and C-reactive protein (CRP) levels were measured before and 24 hours after treatment. The cosmetic satisfaction of the patients was investigated at 3 months after surgery.Results:The time of flap separation and cavity construction, total operation time, drainage volume and hospitalization days in the observation group were (34.27±4.38) min, (130.75±12.28) min, (143.49±15.48) ml, and (7.21±1.95) days, and they were (12.43±1.83) min, (90.38±8.65) min, (87.48±12.11) ml, and (5.48±1.32) days in the control group, and the differences between the two groups were statistically significant ( t values were 29.098, 17.002, 18.024, and 3.576, all P < 0.01). The VAS score of chest pain in the observation group was higher than that in the control group at 3 days after surgery ( P < 0.05); the CRP and WBC levels in the observation group were lower than those in the control group at 24 hours after treatment (both P < 0.05). The cosmetic satisfaction rating grade in the observation group was 6 cases of grade Ⅰ, 31 cases of grade Ⅱ, 2 cases of grade Ⅲ and 1 case of grade Ⅳ, and there were 1 case of grade Ⅰ, 10 cases of grade Ⅱ, 24 cases of grade Ⅲ and 5 cases of grade Ⅳ in the control group, the cosmetic satisfaction of the observation group was better than that of the control group ( P < 0.05). There was no significant difference in the incidence of postoperative wound infection, temporary recurrent laryngeal nerve paralysis and subcutaneous hematoma between the two groups (all P > 0.05). Conclusion:The radical thyroidectomy via axillary approach endoscope without air insufflation has good therapeutic and cosmetic effects, and it can effectively reduce the inflammatory response in patients.

When the use of root canal retreatment and apical surgery experiences difficulty in treating endodontic diseases, intentional replantation is an optional clinical technique used to retain the tooth. A 28-year-old female complained of chewing discomfort at the mandibular second molar after undergoing root canal treatment 3 month ago. History record and radiographic examination revealed that a C-shaped root canal system was filled with gutta-percha in the mandibular second molar. A radiolucency area existed at the root furcal area with a thin canal wall in the distal and mesial roots. Intentional replantation was used to treat this tooth. The clinical and radiographic results showed that intentional replantation and nano-biomaterial application facilitated infection control, tooth retention, and periodontal tissue regeneration.
Female ; Humans ; Adult ; Tooth Replantation ; Root Canal Therapy ; Dental Pulp Cavity ; Gutta-Percha/therapeutic use* ; Tooth Root ; Molar/surgery* ; Retreatment