OBJECTIVEThis study aims to investigate the caries status of the first permanent molar and primary tooth among 7- to 9-year-old children in Tangshan city and the correlation between caries of primary tooth and the first permanent molar.

METHODSA stratified cluster sampling method was used on the basis of the Basic Approach of Oral Health Survey of WHO and the Guideline of the Third National Oral Health Survey. A total of 10 primary schools were randomly sampled in clusters that included 51 primary school sampling spots in Tangshan. The caries status of 1 794 children aged 7 years to 9 years was examined.

RESULTSThe prevalence rate of the first permanent molar caries was 47.49% (852/1 794), the mean number of DMFT was 1.30 ± 1.59, the mean number of DMFS was 1.96 ± 3.40, and the filling rate was only 2.35% (20/852). The preva- lence rate and mean DMFT of the first permanent molar caries showed significant difference between different ages and genders (P < 0.05). However, the mean DMFS of the first permanent molar caries only showed significant difference between the various ages (P < 0.05). The prevalence rate of the primary tooth caries was 83.11% (1 491/1 794), the mean number of dmft was 4.82 ± 3.55, the mean number of dmfs was 6.51 ± 5.61, and the filling rate was 12.41% (185/1 491). Caries of primary tooth was the first permanent molar caries risk factor [r = 0.277, OR = 5.736, P = 0.00, 95% CI (4.175, 7.881)]. Significant correlation was found between the caries of primary tooth and first permanent molar (r = 0.274, P < 0.001).

CONCLUSIONCaries status of the first permanent molar among 7- to 9-year-old children in Tangshan city is serious. Caries status of primary tooth may play an important role in predicting the first permanent molar caries in clinic and prevention.

Child ; DMF Index ; Dental Caries ; Humans ; Molar ; Risk Factors ; Tooth, Deciduous

Agricultural Workers' Diseases ; Humans ; Musculoskeletal Diseases

Objective:To evaluate the effects of the flowable resin used as pit and fissure sealant using different etching adhesive systems.Methods:60 caries-free extracted human premolars were randomly divided into 4 groups(n =1 5)and treated by Gluma, NT and 3M-Z350 flowable resin(group A);Clearifil SE Bond adhesive and 3M-Z350 flowable resin(group B),phosphoric acid etching,3M-Z350 flowable resin and phosphoric acid etching(group C)and 3Mconcise sealant(group D)respectively.After pro-cessing the tooth surface the pit and fissue of 1 0 sample in each group were sealed.The microleakage was measured by 1 % methyl-ene blue staining(n =8).The material-enamel interface was observed by SEM(n =2).The shear bond strength of the column-shaped samples with the diameter and the height of 3 mm(n =5)on the mesial or dental surface was examined by a test machine. The sealant cartridges and flowable resin cartridges with the diameter and height of 4 mm were used for the crushing strength exami-nation(n =1 0).Results:There was no significant difference in the microleakage among the 4 groups.SEMobservation showed that the resin tags of group A were long and dense and the resin tags of group B were short and sparse,bubbles and cracks were found on the local site in group A and B.The resin tags of group C were long and thin,but combined with tooth tightly;the resin tags of group D were short and dense;the penetration was poor at the bottom of the fissures in the 4 groups.The shear bond strength of Group A was the highest(P <0.01 ),that of group C was higher than that of group B and D(P <0.05).There was no significantly difference between group B and D(P >0.05).The compressive strength of flowable resin groups was higher than that of fissure seal-ant group(P <0.05).Conclusion:The shear bond strength and compressive strength of all-etching bonding system combined with flowable resin is superior to that of self-etching bonding system combined with flowable resin and the traditional sealant.Using Prime&Bond NT bond after acid etching may improve the shear bonding strength.

In this paper, we described basic connotations of comparative effectiveness research (CER), expounded the application of CER in chronic obstructive pulmonary disease (COPD). In addition, on the basis of research practice of Chinese medical treatment for COPD in recent years, we put forward the thought of the junction point of Chinese medicine in CER on COPD from the perspective in screening effective Chinese herbs, establishing treatment program/methods/technologies, and outcomes evaluation.
Comparative Effectiveness Research ; Humans ; Medicine, Chinese Traditional ; Outcome Assessment (Health Care) ; Pulmonary Disease, Chronic Obstructive ; therapy

AIM:To compare the accuracy of conventional contact A-scan and IOL Master in measuring axial length and anterior chamber depth, and to evaluate the characteristics of these two different methods.METHODS:Totally 145 cases (189 eyes) who underwent phacoemulsification and intraocular lens implantation in our hospital from January 2015 to December 2016 were observed prospectively.They were divided into five groups according to ocular axial length measured by IOL Master(Group A:AL≤22mm, Group B:22mm28mm).The axial length and anterior chamber depth were measured by A-scan and IOL Master respectively before operation, corneal curvature was measured by IOL Master.AL≤22mm using Hoffer Q formula to calculate the crystal degree, AL>22mm using Haigis formula to calculate the crystal degree.Analysis of axial length, anterior chamber depth and mean absolute refractive error at 3mo after surgery.RESULTS:The axial length measured by A-scan and IOL-master:Group A were 21.48±0.41mm and 21.46±0.40mm (P>0.05);Group B were 23.13±0.62mm and 23.14±0.63mm(P>0.05);Group C were 25.24±0.56mm and 25.27±0.59mm(P>0.05);Group D were 26.97±0.59mm and 27.03±0.64mm(P>0.05);Group E were 30.76±1.40mm and 31.01±1.53mm(P<0.05).Mean absolute refractive error (MAE) at 3mo after surgery by A-scan and IOL Master:Group A were 0.50±0.30D and 0.43±0.27D(P>0.05);Group B were 0.48±0.34D and 0.45±0.32D(P>0.05);Group C were 0.56±0.32D and 0.49±0.40D(P>0.05);Group D were 0.64±0.16D and 0.50±0.22D(P>0.05);Group E were 0.91±0.47D and 0.62±0.29D(P<0.05), MAE≤±0.50D were 38.7% and 65%(P<0.05), MAE≤±1.00D were 69.2% and 83.3%(P>0.05).Anterior chamber depth measured by A-scan and IOL Master:Group A were 2.81±0.35mm and 2.82±0.41mm (P>0.05);Group B were 3.04±0.50mm and3.10±0.47mm (P>0.05);Group C were 3.55±0.62mm and 3.60±0.52mm (P>0.05);Group D were 3.42±0.24mm and 3.51±0.30mm(P>0.05);Group E were 3.50±0.28mm and 3.61±0.34mm(P>0.05).CONCLUSION:IOL Master and contact A-scan have a high degree of consistency in the biological measurement, IOL Master has higher accuracy for patients with high myopia and long axis.It is a simple, accurate, good-repeatable and non-contact measurement tool.

Objective To report the integrated progress of the hydatid disease information management system,and to pro-vide the reference for further system improvements by analysis of results on simulation test feedback. Methods The work of in-stitutional code matching by collecting fundamental and integrated information of the system in epidemic areas of hydatid disease was carried out,and professional control agencies were selected to carry out the simulation test. Results The results of agen-cies code matching at stage indicated the average completion rate was 94.30% on administrative agencies,69.94% on registered professional agencies and 56.40% on professional institutions matching related to hydatid disease prevention and control imple-ments in seven provinces(autonomous regions)and Xinjiang Production and Construction Corps. Meanwhile,the response rate of open-ended proposals was 93.33% on fifteen feedbacks,and the statistics showed 21.43% believed the system was low fluen-cy,64.29% considered the system was inconvenience for data inputs and 42.86% considered it would be improved on system sta-tistics functions,of which 27.78% were provincial users,22.22% were the city users and 50.00% were the county users. Con-clusion The hydatid disease prevention information management system meets the fundamental needs of the majority agencies in hyperendemic areas of echinococcosis,it needs to develop the further test with more agencies joining after the work of the in-stitutional code matching completion and the system service improvement in the next stage.

Objective To explore the diagnostic value of LUNX gene to marrow micrometastases of lung cancer.Methods To detect LUNX mRNA of marrow samples of 51 patients of lung cancer,4 patients of breast cancer,6 patients of lymphadenoma,3 patients of liver cancer and 22 patients of benign disease by real-time RT-PCR.Results The positive detection rate and meso-copies of lung cancer were 58.8% (30/51) and 35copies/ml respectively.The positive detection rate and meso-copies of other diseases were all 0,The positive detection rate and meso-copies of lung cancer was significantly higher than that of patients with other diseases (x~2=11.12,U_c=3.7329,P

Objective To investigate the protective effect of sevoflurane on the brain against focal ischemia-reperfusion(I/R)injury and its mechanism.Methods Twenty-four male SD rats weighing 250-300 g were randomly allocated into 3 groups(n=8 each):group Ⅰ sham operation;grouop Ⅱ I/R and group Ⅲ I/R + sevoflurane.The rats were anesthetized with intraperitoneal chloral hydrate 300 mg?kg~(-1).Middle cerebral artery occlusion(MCAO)was produced by insertion of a 4-0 mono-filament nylon thread with rounded tip at bifurcation of right common carotid artery into internal carotid artery.The nylon thread was advanced cranially until resistance was felt.The depth of insertion was 18-20 mm.After 3 h MCAO the thread was withdrawn to allow reperfusion.In group Ⅲ the animals inhaled 1.0 MAC sevoflurane for 30 min at 30 min before reperfusion.The rectal temperature of the animals was kept at 36.5-37.5℃.At the end of 24 h reperfusion the animals were weighed again.The animals'neurological deficit was evaluated using Zea Longa score(0=no defcit,4=unable to walk and unconscious).The animals were then killed.The neuronal apoptosis in striatum was assessed(TUNEL)and the PKC protein expression in striatum was determined by immunocyto-chemistry.Results The body weight of the animals in I/R group was significantly reduced after 24h reperfusion as compared to the body weight before ischemia (P＜0.01),while in control group and sevoflurane group there was no significant difference in the body weight before and after sham operation or I/R.The neurological deficit scores were significantly higher in I/R group than in sevoflurane group.The number of apoptotic neurons in striatum was significantly higher in I/R group than in sevoflurane group.The PKC expression in striatum was significantly higher in sevoflurane group than in I/R group (P＜0.01).Conclusion 1.0 MAC sevoflurane inhalation has protective effect on the brain against I/R injury. Upregulation of PKC expression in striatum decreased by I/R is involved in the mechanism.

Compared with normal tissues and cells, the tumor microenvironment has significant differences. For example, glutathione-related metabolic enzymes and reactive oxygen species are highly expressed in different subcellular structures, resulting in an unbalanced redox state. Aiming at the specific redox state in tumor tissues and cells, a series of small molecule prodrug self-assembled nanoparticles can be designed and connected by intelligent response linkers including disulfide bonds, sulfide bonds, and selenium bonds, thioketal bonds, etc. The in vitro and in vivo efficiency and metabolic mode of these nanoparticles are related to the type of linker. This review will summarize the tumor redox microenvironment, the design of intelligent responsive small molecule prodrug nanoparticles, and the metabolic pathways of small molecule prodrug nanoparticles with different connecting linkers and their relationship with drug efficacy.

OBJECTIVEThis study was performed to determine whether recombinant human angiopoietin-1 (rhAng-1) decreases the permeability of the blood-brain barrier (BBB) in focal cerebral ischemia and reperfusion rats, whether RhAng-1 opens the BBB by affecting tight junction associated proteins zonnula occludin-1 (ZO-1), occludin and adherens junction protein vascular endothelial (VE)-cadherin.

METHODSThe rats were divided into eight groups randomly( n = 10): (1) sham-operated group; (2) ischemia group; (3)-(5) ischemia/reperfusion (middle cerebral artery occlusion and reperfusion (MCAO/R) 12 h, 48 h, and 7 days) and 0.9% saline groups; (6)-(8) ischemia/reperfusion (MCAO/R 12 h, 48 h, and 7 days) and rhAng-1 groups. The Bee permeability was assessed by Evans blue extravasation. The messenger RNA and protein expressions of ZO-1, occludin, and VE-cadherin were determined by reverse transcription-polymerase chain reaction, Western blot, and immunohistochemistry assays.

RESULTSThe BBB permeability and the brain infarct volume were significantly decreased after rhAng-1 injection. The expressions of ZO-1, occludin, and VE-cadherin were increased after rhAng-1 injection.

CONCLUSIONrhAng-1 may decrease the permeability of BBB in MCAO/R rats by upregulation of ZO-1, occludin, and VE-cadherin.

Angiopoietin-1 ; pharmacology ; Animals ; Antigens, CD ; metabolism ; Blood-Brain Barrier ; cytology ; metabolism ; Brain Ischemia ; metabolism ; Cadherins ; metabolism ; Endothelium, Vascular ; cytology ; drug effects ; Humans ; Male ; Occludin ; metabolism ; Rats ; Rats, Wistar ; Recombinant Proteins ; pharmacology ; Reperfusion Injury ; metabolism ; Zonula Occludens-1 Protein ; metabolism