[Application of periodontal microsurgery in the augmentation of attached gingiva around an implant].

OBJECTIVE: This study aimed to evaluate the clinical effect of periodontal microscopic surgery on the augmentation of attached gingiva and determined the clinical principle on how to use minimally invasive surgery to improve the surgery success rate. METHODS: Twenty patients with insufficient attached gingiva around implants were selected. Periodontal microscopic surgery for free gingival graft was performed to increase the width of the attached gingiva around the implants. The survival state of the free gingiva was observed after surgery, and the width of the attached gingiva around the implants was recorded before and after surgery and 1 year after surgery. The shrinkage rate of the free gingival flap 1 year after surgery was analyzed to evaluate the stability of the flap. RESULTS: The flaps of the 20 cases all survived. One year after the operation, the width of the attached gingiva was (3.05±0.44) mm, which increased compared with that of preoperation (2.56±0.31) mm
and decreased compared with that of postoperative day (2.13±0.28) mm. The shrinkage rate of the attached gingiva was 41.22%±5.04%. CONCLUSIONS: The application of microscopic surgery on the augmentation surgery of attached gingiva can increase the success rate and improve the quality and quantity of attached gingiva around implants.

Effects of non-surgical periodontal therapy combined with emodin on insulin resistance and serum inflam-matory factors in obese rats / 实用医学杂志

Objective To investigate the effect of emodin on insulin resistance and serum inflammatory factors in obese rats. Methods 16 obese rats with experimental periodontitis were selected and then randomly di-vided into periodontal treatment group(control group)and periodontal therapy combined with emodin group(medi-cation group). All the rats were sacrificed 2 weeks after treatment. Before the rats were killed,the orbital vein blood was taken to detect fasting blood glucose,fasting insulin;levels of serum C-reactive protein(CRP)and tu-mor necrosis factor-α(TNF-α)were detected by enzyme linked immunosorbent assay.Results 2 weeks after peri-odontal treatment,level of CRP was significantly lower in the medication group than in the control group(t =2.170,P = 0.044);TNF-α was significantly lower in the medication group than in the control group(t = 3.074, P=0.007).Fasting blood glucose level was lower in the medication group than in the control group,and HOMA-β was higher than the control group,no statistical differences were found between the two groups.Conclusions Non-surgical periodontal treatment combined with local administration of emodin can help repair of periodontal epitheli-al barrier and reduce levels of serum inflammatory factors.

The influence of ultraviolet irradiation on sandblasted and acid-etching surface adsorbing human fibronectin / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To study the influence of ultraviolet (UV) irradiation on physical and chemical properties of sandblasted and acid-etched (SA) titanium surface and their ability to adsorb human fibronectin (HFn).</p><p><b>METHODS</b>SA and UV-SA surfaces were separately prepared. Surface morphology, roughness, elemental composition, wettability and HFn adsorption assay were performed for comparative analysis of these two surfaces.</p><p><b>RESULTS</b>SA and UV-SA surface had a similar morphology with multi-holes, and average roughness. UV-SA surface had a lower C content (22.83%) and higher O content (51.20%) and presented hydrophilicity, while SA surface showed hydrophobicity. But the quantity of adsorbed HFn on SA surface at 10 min assay point [(0.41 ± 0.07) µg] was statistically higher than that on UV-SA surface [(0.26 ± 0.08) µg](P = 0.007).</p><p><b>CONCLUSIONS</b>UV irradiation would not change the morphology and roughness of SA surface. However, it could reduce the hydrocarbon and increase the hydroxyl groups, and the absorption of HFn on UV-SA surface at 10 min assay point was statistically lower than that on SA surface. Therefore, the in-vitro bioactivity of UV-SA surface was not as good as that of SA surface.</p>

The high risk factors and clinical analysis of respiratory distress syndrome in neonates at different gestational age / 临床儿科杂志

Objective To compare the high risk factors, complications, treatment and prognosis of respiratory distress syndrome (NRDS) in neonates at different gestational age (GA). Methods Between August 2012 and July 2013, 156 neonates with RDS were selected and distributed into 3 groups, 42 early preterm (GA<34weeks), 52 late preterm (GA 35 to 36 weeks), and 62 in term group (GA≥37 weeks). Retrospectively analysis was performed for high risk factors, complications, treatment and prognosis of the three groups. Results In 156 neonates with RDS, the male and female proportion was 2.25:1. All groups had more males, but the gender difference has no statistical signiifcance in three groups (P=0.923). The onset time of RDS and the hospitalization time both show an increasing trend of statistical signiifcance (P<0.05). Comparing the difference of high risk factors for RDS of the 3 groups, birth asphyxia, placental abnormalities, multiple pregnancy, premature rupture of membranes was most common in early preterm group, and followed by late preterm group, and C-section was most common in term group and unexplained preterm was more common in early preterm group than that in late preterm group (all P<0.05). Among the three groups, the ratio of pulmonary surfactant application was the lowest in the term group, the ratio of X-ray grade over II was high-est in early preterm group, oxygen and hospitalization time were the longest in early preterm group (P<0.05). The risks of com-plicated with pulmonary infection, intracranial hemorrhages and bronchopulmonary dysplasia were the highest in early preterm group and the risk of complicated pneumothorax was the highest in term group. Among three groups, the recovery rate was the lowest in the early preterm group (P<0.01). Conclusion The clinical characteristics, high risk factors, complications and treat-ment responses of RDS in neonates with different GA were different, so GA should be considered for diagnose and treatment. For the term infants, the elective caesarean section should be strictly controlled, in order to reduce the incidence of RDS.

Protective effect of amyloid-beta 42 protein and its subunit vaccines immunization on spatial learning and memory of APPSWE transgenic mice / 中国组织工程研究

BACKGROUND: It has been demonstrated that amyloid-beta 42 protein (Aβ42) immunization in transgenic mouse models of Alzheimer disease(AD)can induce specific Aβ42 antibody, clear Aβ from the brain, and thereby improve spatial learning and memory. It has been a promising treatment strategy for AD.OBJECTIVE: To explore the effect of Aβ42 and its subunit vaccines immunization on spatial learning and memory of APPSWE transgenic mice.DESIGN: A randomized controlled experiment with mice as subjects.SETTING: The brain research laboratory of the anatomy department in a the medical college of a univeristy.MATERIALS: The experiment was conducted in the Experimental Animal Center and the Anatomy Department of Sun Yat-sen University from April 2003 to February 2004. Thirty-two APPSWE transgenic mice of 5 months old were bought from Taconic Company, USA. The second generation of mice were successfully reproduced in the Anatomy Department. These mice were randomly assigned into four groups: control group, Aβ42 group, Aβ1-15group, and Aβ36-42 group. Each group contained 8 in each group.INTERVENTIONS: Aβ42 and its subunits combined with MF59 adjuvant were subcutaneously injected for fundamental immunity and then applied in nasal mucosa for intensified immunization. The immunization period was 8 months. Y-maze was used for behavior test before immunization and Morris water maze was used after immunization.MAIN OUTCOME MEASURES: Spatial learning and memory, mean escape latency, times of passing through the platform point, swimming distance percentage of the first quadrant, and swimming distance percentage of the 20% marginal area.RESULTS: The correct reaction times in Y-maze behavior test were 7.50 ±0. 81, 7.06 ±0.71, 7.19 ±0.91, and 7.50 ±0.86 respectively in the control, Aβ42, Aβ1-15, Aβ36-42 groups and there was no significant difference ( P ＞ 0. 05) . After immunization, the mean escape latencies in 8 units of localized navigation test were(67.3 ±2. 8) s, (23.6 ± 1.6) s, (26.4 ±2.0) s,and (36.5 ± 2.2) s. The results in three experiment groups were different from that in control group and there was no difference between the three experiment groups ( P ＞ 0. 05 ) . The mean times of passing through the platform point in the 4 groups were 0.71 ±0.29, 8.14 ± 1.37, 7.28 ± 1.34,and 3.29 ± 0. 67. Swimming distance percentage of the first quadrant in the4 groups were(24.3 ±2.9)%, (50.6±11.6)%, (49.9±9.3) %,and(35.4±7.0)% and the swimming distance percentages of 20%marginal area were (46.4 ± 7.3 ) %, ( 11.6 ± 3.9) %, ( 14.4 ± 2. 6) %, and (25.8 ± 3.3)%. The mice in three experiment groups showed increase in the times of passing through platform point, swimming distance percentage of the first quadrant, and decrease in distance percentage of 20% marginal area compared with control group. The results in three experiment groups were no significantly different( P ＜ 0. 05).CONCLUSION: Immunization with A342 and its subunits can effectively ameliorate impairment of spatial learning and memory in APPSWE transgenic mice.

Specific humoral immune responses in adult rhesus monkeys vac cinated with A?_(1-15) peptide vaccine / 中国病理生理杂志

AIM: To observe the humoral immune response in adult rhesus monkey induced by A? 1-15 vaccine. METHODS: 5 adult male rhesus monkeys were injected intramuscularly with A? 1-15 vac cine at baseline and at week 2, 6, 10, 14, 18, 22. The titer and IgG isotypes of the antibody against A? 1-42 in the serum were measured with ELISA. The specificity of the antibody against A? 1-42 was determined by Wester n blotting. The A? plaques in Tg2576 transgenic mouse brain were stained with t he antisera using immunohistochemistry method. RESULTS: At the eighth week after the vaccination, antibody against A? 1-42 bega n to develop significantly i n the serum. The titers of the antibody increased following vaccine boosted and reached 1: 3 840 at the twenty-fourth week, then decreased after the terminat ion o f inocunation. The IgG1 was accounted for the highest level in the antisera pool . The antibody against A? 1-42 showed high specificity. The A? plaques in Tg2576 transgenic mouse brain were labeled with the antisera. CONCLUSION: A? 1-15 vacci ne could induce vigorously specific humoral immune responses in adult rhesus mon key.