BACKGROUND: Excessive residue of dental calculus and dental plaque and scratch of Instruments on dental root surface will cause rough root surface, which will accelerate accumulation of dental calculus and dental plaque. Improved scaling can solve this problem, but the operation of ultrasonic subgingival scaling is not regular by some clinical physicians.OBJECTIVE: To study the effect on the root surfaces and the work efficacy following ultrasonic subgingival scaling with different output power and different parts of work tip.DESIGN, TIME AND SETTING: The comparison observational study was performed at the Laboratory of Medical College of Qingdao University from March to May 2009.MATERIALS: Twenty root surfaces from ten teeth extracted for severe periodontal diseases were selected, and the volume of dental calculus was basically equal. Ex vivo teeth were obtained from two male patients aged 40-50 years.METHODS: Twenty root surfaces were randomly divided into group A or group B, the high power was set as "3" gear (group A), and the low power was set as "1" gear (group B), using the side (group A1 and B1) and the top (group A2 and B2) of work tip. The time for scaling was recorded and the surface feature of all the specimens was observed under scanning electron microscope(SEM).MAIN OUTCOME MEASURES: Changes in root surface structure were observed.RESULTS: The damage of root surfaces in groups A1 and B1 was less severe, while more in groups A2 and B2. There were less calculus and plaque residual on root surfaces in group A than in group B. Cementum exfoliation was observed in group A but not in group B. The operating time of group A was significantly shorter than that of group B (P < 0.01). However, there was no significant difference between groups A1 and A2 or groups B1 and B2 (P > 0.05).CONCLUSION: Calculus and plaque can be cleaned more effectively and the damage is less severe by using the side of work tip. Although the calculus can be cleaned more rapidly by using higher power set, the damage is more severe.

To investigate the influence of the difference enhancers on the transport mechanism of chlorogenic acid (CGA) across Caco-2 cells model, a RP-HPLC method was adopted to detect the concentrations of CGA. At the concentrations of 20 to 80 microg x mL(-1), the difference of absorption rate constants (K(a)) was not statistically significant. At the concentrations of 40 and 20 microg x mL(-1), the ratios of apparent permeability coefficients (P(app)) of the apical to basolateral and the basolateral to apical were 1.14 and 1.18, respectively. With the effect of enhancers K(a) and P(app) increased, the absorption half-life (T1/2) decreased. CGA passed through the Caco-2 cell membrane mainly by passive transport. It showed that monocarboxylic acid transporter (MCT) could be involved in the across membrane transport process of CGA. Borneol had no effect on the cell membrane transport processes. The order of increasing absorption of CGA caused by the enhancers was sodium lauryl sulphate > sodium taurocholate > carbomer.

Objective To observe the therapeutic effect of chitosan oral ulcer spray in treatment of recurrent aphthous ulcer(RAU).Methods Sixty patients suffered with RAU were randomly divided into two groups.The test group was treated with chitosan oral ulcer spray,while the control group was given a traditional Chinese medicine named Xileisan.To evaluate the efficacy according to a specialized evaluate standard.Results The disease course of test group was shorter than that of the control group.The test group was more effective in mitigating the pain of RAU than that of the control group.ConclusionThe efficacy of chitosan oral ulcer spray in treatment of RAU is superior to Xileisan.

Objective To evaluate the biocompatibility and antibacterial activities of the Ornidazole Slow-Release Membrane.Methods 1.The lower lips of 12 rats were sewed into 12 pockets and the pockets were immited with extracting solution of the ornidazole membrane, formaldehyde and normal saline respectively once per day.The specimens were examined histologically 7 days later.2.The dorsal muscles of 16 rats were implanted with the membranes or silk threads,and examined histologically 1 week and 2,4,6 weeks later respectively.3. The antibacterial activity against Streptococcus mutans and Fusobacterium nucleatum was observed on solid culture medium in vitro.Results The animal experiments showed the membranes were not irritative to the oral mucosa.It was found that the tissue reaction of the membranes was similar to that of the silk threads after implanted into dorsal muscles and the membranes had been degraded in the second week.And the membranes had effective antibacterial action against Streptococcus mutans and Fusobacterium nucleatum.Conclusion The Ornidazole Slow-Release Membrane possesses favorable biocompatibility and antibacterial activities.

Objective To study the expressions of neuroglobin gene in cellular tissues of human body.Methods Total 13 species tissue RNA, superscription RNA 2 ?g of every tissue was reversed into transcription cDNA and 1 ?l of cDNA was made into PCR template. Total RNA 2 ?g from every specimen equivalently were reversed into transcription cDNA. PCR products experienced agarose gel electrophoresis and electrophoresis and extraviolet-gelatum Image J was quantitatively analyzed. All data were indicated with ?s and treated with Oneway mono agent analysis of variance of stata statistical package,P

Objective:The purpose of our study was to assess the clinical value of ultrasound in the diagnosis of retroaortic left renal vein (RLRV) behind abdominal aorta.Methods:The ultrasound images of patients with RLRV diagnosed by ultrasound in Union Hospital Affiliated to Tongji Medical College of Huazhong University of Science and Technology from 2013 to 2018 were retrospectively analyzed. The general information, clinical symptoms, ultrasound images and other clinical data of the patients were collected and analyzed.Results:RLRV was detected in 16(0.46%) cases of the 3 519 patients from 2013 to 2018 using ultrasonography, and the male to female ratio was 11 to 5. All patients presented with hematuria, including 7 patients with other symptoms, such as left flank pain. Ultrasound were firstly performed in all patients. Of the 16 patients, 15(93.75%) cases were of complete retroaortic type Ⅰ, including 13(81.25%) cases with left renal vein compression and 2(12.5%) cases with complete retroaortic type without left renal vein compression. In 16 cases, 1 case (6.25%) was type Ⅲ, with compression of both branches.Conclusions:Ultrasound may be the preferred method for the left renal vein examination when a clinical suspicion of Nutcracker syndrome is required. Ultrasound can clearly show the left renal vein in most patients, to determine whether the left renal vein is mutated or compressed. Ultrasound has the highest sensitivity for detecting the type Ⅰ, which is not easy to misdiagnose. However, type Ⅲ is easy to misdiagnosis. Whereas the type Ⅱ and type Ⅳ is difficult to detect using ultrasound, which may be related to the limitations of ultrasound imaging.

Objective To provide scientific basis for developing mental interventions for the wounded in major disasters by assessing the mental health status and the mental intervention effect among the Wenchuan earthquake survivors transferred to Chongqing.Methods A total of 389 transferred wounded survivors were examined by using questionnaires including general information questionnaire,Psychological Health Self-rating Questionnaire (PHSQ),Symptom Checklist 90 (SCL-90),Perceived Social Support Scale (PSSS) and Coping Styles Questionnaire (CSQ).According to PHSQ,the wounded were divided into control group and stress group.Then,the stress group was given mental intervention and taken the second mental evaluation one month later.Results Acute stress disorder (ASD) rate (30.08％) was remarkably observed in these transferred wounded,who were subsequently administered a set of mental intervention.The wounded whose PHSQ mark ≥8 were defined as the stress group (Group A) and the others as the control group ( Group B).Compared with Group B,Group A had higher scores in depression ( P ＜ 0.01 ),anxiety ( P ＜ 0.01 ) and consternation ( P ＜ 0.01 ),and lower scores in PSSS (P ＜0.01 ).Group A inclined to negative coping styles mainly including shrink back (P ＜ 0.01 ) and fantasy (P ＜0.01 ),while Group B inclined to coping styles mainly including rationalization and help.The PSSS score in Group A was significant lower than that in Group B (P ＜ 0.01 ).The scores in PHSQ,SCL-90 (anxiety and consternation),CSQ and PSSS were significantly improved after the mental intervention in Group A.Conclusions The incidence of ASD is high in the transferred wounded survivors and is mainly related with mental stress,such as emotional symptoms,negative coping styles and low perception of social support.Early mental interventions will help improve the psychological status of the transferred wounded.

Objective To determine the reference intervals for thyroid function tests during the second half of pregnancy (20-40 gestational weeks),and to assess the relationship between thyroid peroxidase antibody (TPOAb) levels and the incidence of gestational thyroid diseases.Methods Levels of thyroid stimulating hormone (TSH),free thyroxine (FT4),TPOAb and urinary iodine excretion were determined in 4 729 pregnant women,who received prenatal health care at First Affiliated Hospital of Nanjing Medical University from July 2011 to August 2013.Among these women,2 568 were selected using the recommendations of the American National Academy of Clinical Biochemistry,and were divided into five groups according to their gestational age:≥ 20 to ＜24 weeks (682 cases),≥ 24 to ＜28 weeks (1 322 cases),≥ 28 to ＜32 weeks (178 cases),≥ 32 to ＜36 weeks (185 cases) and ≥ 36 to ≤ 40 weeks (201 cases).Reference intervals of thyroid function tests in the second half of pregnancy were calculated.The reference values of thyroid functions in different gestational weeks were compared,and the reference intervals of thyroid functions in the second half of pregnancy were determined.The effects of maternal age and positive TPOAb on gestational thyroid diseases were analyzed.A non-parametric test,analysis of variance or Chi-square test was used for statistical analysis.Results (1) Reference intervals for maternal thyroid function in the second half of pregnancy in our hospital were established [TSH:0.65-5.27 mU/L and FT4:8.74-14.84 pmol/L].(2) The percentage of thyroid diseases was higher using the non-pregnancy reference intervals (TSH:0.27-4.20 mU/L and FT4:12.00-22.00 pmol/L) than using the pregnancy reference intervals [64.0％ (3 025/4 729) vs 16.1％ (763/4 729),x2=47.465,P ＜ 0.01],which manifested as a higher rate of clinical hypothyroidism and simple hypothyroxinemia [5.4％ (255/4 729) vs 0.4％ (20/4 729),x2=14.321;54.1％ (2 560/4 729) vs 9.1％ (429/4 729),x2=47.108;both P＜0.01] and a lower rate of subclinical and clinical hyperthyroidism [1.2％ (58/4 729) vs 3.3％ (155/4 729),x2=6.650;0.3％ (13/4 729) vs 0.6％ (27/4 729),x2=2.062;both P＜0.05].(3) The incidence of clinical hypothyroidism and simple hypothyroxinemia in pregnant women aged ＞30 years was higher than in those aged ≤ 30 years [0.7％ (10/1 377) vs 0.3％ (10/3 352),x2=4.257;11.7％ (161/1 377) vs 8.0％ (268/3 352),x2=16.102;both P＜0.05].The incidence of clinical hypothyroidism and clinical hyperthyroidism in TPOAb positive women was higher than that in TPOAb negative women [2.7％ (9/335) vs 0.3％ (11/4 394),x2=44.009;3.9％ (13/335) vs 1.2％ (52/4 394),x2=16.784;both P＜0.01].Conclusions The established pregnancy-specific reference ranges of thyroid function tests can reduce the missed diagnosis and misdiagnosis of gestational thyroid diseases.Maternal age ＞30 years and positive TPOAb may increase the risk ofgestational thyroid diseases.

AIM: To study the effects of oxidative modification lipoproteins on blood coagulation and fibrino (lysis) in vitro. METHODS: Normal human plasma VLDL, LDL and HDL, which were isolated by density gradient ultracentrifugation method, were oxidatively modified by Cu~(2+) and HOCl method. N-VLDL, Ox-VLDL, N-LDL, Ox-LDL, N-HDL, Ox-HDL were added to the reaction system which consisted of mixed fresh normal plasma respectively, prothrombin time (PT), activated partial thrombplastin time (APTT), plasminogen activator inhibitor 1 (PAI-1), tissue plasminogen activator (t-PA) and platelet aggregation were measured according to the direction of the kits. RESULTS: The relative electrophoretic mobility (REM), absorbance at 234nm and TBARS of oxidized VLDL, LDL and HDL mediated by HOCl or Cu~(2+) were significantly higher than that of the control group (P