BACKGROUND: Fluorine used for light-cured fluorine-containing resin can reduce and prevent dental caries, as well as play a long-term effect against tooth decay. However, there are rare reports on the composite preparation and performance.OBJECTIVE: To study the preparation and performance of the light-cured fluorine-containing resin. METHODS: Triethylamine as a catalyst, bisphenol A, bisphenol S, glycidyl methacrylate, trifluoroacetic anhydride and inorganic fillers (modified silicon dioxide, hydroxyapatite or titanium dioxide at mass fraction of 5％, 10％, 15％, 20％)were mixed to prepare the light-cured fluorine-containing resin. Then, the tensile strength, bending modulus,polymerization conversion and water of the composites were tested, and the morphology of the resin was observed under transmission electron microscope.RESULTS AND CONCLUSION: At the same mass fraction, the tensile strength was highest in the titanium dioxide group, higher in the hydroxyapatite group, and lowest in the silicon dioxide group (P < 0.05). At the same mass fraction, there was no difference in the bending modulus between the titanium dioxide group and the hydroxyapatite group (P > 0.05), while the bending modulus in the silica group was significantly higher than that in the other two groups (P < 0.05).At the same mass fraction, the polymerization conversion of the composite resin was higher in the titanium dioxide group than the hydroxyapatite and silicon dioxide groups (P < 0.05), but there was no difference between the latter two groups (P > 0.05). With the increasing of mass fraction, the water absorption of the composite resin kept an increasing trend.Under the transmission electron microscope, the fracture surface of the silicon dioxide group was relatively flat, and the resin body exhibited good biocompatibility with the filler; in the hydroxyapatite group, the fracture surface was rough with obvious ups and downs, and the biocompatibility between the resin body and the filler was relatively poor; in the titanium dioxide group, the fracture surface was layered and the filler settled in the resin body, and moreover, titanium dioxide particles were deposited on the bottom of the resin, resulting in larger voids and filler particles as well as poor biocompatibility. To conclude, the light-cured fluorine-containing resin has good mechanical properties, curable properties and absorption rate.

Cardiomyopathy, Dilated ; Cardiomyopathy, Hypertrophic ; genetics ; Humans ; Mutation

Objective To analyze the clinical and pathologic features in patients with ldiopathic cytopenia of undetermined signif-icance (ICUS) ,and provide the diagnostic basis .Methods 10 ICUS patients who did not fulfil minimal diagnostic criteria for MDS but suffered from constant (>6 months) progressive cytopenia ,with no marked dysplasia (<10% in three-major cell lineages) and abnormal karyotype were reported .Results 2 of 10 patients transited to MDS ,bone marrow review showed that ≥2 cells appeared diagnostic pathology development .Karyotype analysis showed that 1 case was still normal ,1 case lost a normal chromosome 20 (20q-) ,the rest 8 cases had been efollowed up for 6 to 25 months and still maintain ICUS .Conclusion Patients with MDS who fail to meet the diagnostic criteria of ICUS ,must carry out regular follow-up .There are some patients can transition to public MDS after a certain incubation period ,in fact it is Pre-MDS or MDS-early before ,which shows that ICUS should cause clinical attention ,so that avoid missed diagnosis .

Objective To evaluate the value of plastic-embedded bone marrow (BM ) biopsy sections in diagnosing myelodysplas-tic syndrome(MDS) .Methods HGF and Gomori stained .Glycol methacrylate(GMA) embedded BM biopsy specimens were detec-ted from 125 MDS patients with 25 cases in good health as control .Dyshematopoiesis and abnormal stroma cell responses were se-lected as main observed projects .Results Bone marrow biopsy sections gave an exact assessment of cellularity ,19 cases (15 .2% ) showed a decrease of cellularity as hypocellular MDS .66 cases(52 .8% ) of these cases did show abnormal localization of erythro-blastic clusters ,biopsy of 64(62% ) of low risk group 103 cases did show abnormal localization of immature precursors such as blasts and promyelocytes(ALIP positive) .Numeration of megakaryocytes and mast cells within 1mm2 acre of BM tissue were all much in MDS group than in control group .Gomori′s stain revealed moderate increase in reticulin fibres in 65 cases ,10 cases(8 .0% ) showed degree of myelofibrosis were + + + as hyperfibrotic MDS .Among 125 cases ,33 cases(26 .4% ) of bone marrow biopsies showed different types of erythrocytic and granulocytic immature cells with unusual intrasinusoidal bone marrow infiltration .Con-clusion It is clear that GMA embedded BM biopsy section is helpful in making diagnosis of MDS ,and has important clinical appli-cation value .

Arrhythmogenic Right Ventricular Dysplasia ; complications ; Autopsy ; Cardiomyopathy, Hypertrophic ; complications ; Cause of Death ; Coronary Disease ; complications ; Coronary Vessel Anomalies ; complications ; Death, Sudden, Cardiac ; etiology ; pathology ; Humans

Cardiomyopathy, Dilated ; genetics ; Lamin Type A ; genetics

Objective To investigate the similarities and differences of 3 methods for detecting hepatitis B virus S 1(PreS1) ,and select the appropriate method for detecting clinical samples .Methods The PreS1 of the serum samples from chronic hepatitis B pa-tients were tested with enzyme immunoassay analyzer ,time-resolved method and the manual method .To compare the repetition rate ,select PreS1 antigen strongly positive serum and weak positive serum were detected 15 times by three methods ;To compare the explicit rate ,the reaction temperature was raised or lowered by 3 ℃ .Results The positive rate of three methods was 93 .53% , 92 .81% ,92 .81% .Automated ELISA reproducibility CV strong positive CV3 .62% ,weakly positive CV was 13 .42% ,CV of time-resolved method for the 2 kinds of samples were 5 .10% ,7 .92% ,manual methods CV 11 .10% 29 .88% ;changing the reaction incu-bation temperature 3 ℃ ,automatic detection ELISA all specimens S/CO value decreased ,increasing the chance of a false negative . The manual methods and time-resolved detection method for all specimens S/CO values increased ,increasing the chance of a false positive .Conclusion The detection rate and repeatability of automated ELISA were better .The time-resolved method followed and the manual methods were poor .

Arrhythmias, Cardiac ; Humans ; Potassium Channels, Voltage-Gated ; genetics

Objective:To observe the analgesic effect of acupuncture and to explore its central analgesic mechanism in rheumatoid arthritis rabbits.Methods:A total of 60 flap-eared white rabbits were randomly assigned into a normal control group (n=6),a model group (n=6),a body-acupuncture group (n=24),and a buccal acupuncture group (n=24).The later 2 groups were further randomly assigned into 0,0.5,1,and 2 h subgroups,with 6 cases in each group.The rheumatoid arthritis model was established by induction of eggalbumin.In the body acupuncture group,bilateral Xiyan and Zusanli were punctured for 15 s while in the buccal acupuncture group,acupuncture was applied to Xi for 15 s,with the needle retaining for 30 min.The pain threshold was detected with PL-200,taking struggle movements of rabbits as a measurement index,response latency from irradiation to struggling movements as the rabbit's pain threshold.The contents of β-endorplhin (β-EP) and cholecystokinin-8 (CCK-8) in cerebrospinal fluid were examined by radioimmunoassay.Results:Compared with the control group,pain threshold and CCK-8 levels decreased significantly (P＜0.01) and the concentration of β-EP significantly increased (P＜0.05) in the model group.The pain threshold in the body-acupuncture group and the buccal acupuncture group at 0 and 1 h (P＜0.05 or P＜0.01) increased significantly,while the β-EP and CCK-8 contents in the bodyacupuncture group and the buccal acupuncture group were significantly higher than those in the model group (P＜0.01 or P＜0.05).Both β-EP and CCK-8 contents in the buccal acupuncture group at 0 h were significantly higher than those in the body-acupuncture group (P＜0.05).Conclusion:The analgesic effect of buccal acupuncture is superior to that of body-acupuncture.Both buccal acupuncture and body-acupuncture can effectively raise the pain threshold in acute arthritis rabbits,which is closely associated with their effects in the up-regulation of β-EP and CCK-8 contents in cerebrospinal fluid.

Objective To observe blood gas analysis of internal carotid artery and internal jugular vein to calculate the cerebral extraction of oxygen, and to investigate the relationship between oxyhemoglobin in internal jugular vein, cerebral extraction of oxygen, and the prognosis of patients with head injury. Method Seventy patients with acute severe head injury in ICU of Taizhou People Hospital were studied, and another 80 patients with mild head injury were enrolled as controls. Twenty-four hours after first aid such as keeping airway open and circulatory and ventilation support, and emergency craniotomy, the blood samples from internal carotid artery and internal jugular vein were collected for blood gas analysis including SaO2, PaO2, SjvO2, PJVO2 > PaCO2, PJVCO2, SaO2-SjvO2, Pa-jvCCO2, CaO2-CjvO2 and Ca-jvO2/CaCO2 (CEO2, cerebral oxygen extraction). Results There were significant differences in SjvO2, PjvO2, Sa-jvO2, Pa-jvO2 Ca-jvO2 and CEO2 between two groups. Conclusions The SjvO2 and CEO2 represent the cerebral oxygen uptake and oxygen consumption precisely, and they can be used to predict the outcome of patients with severe craniocerebral trauma commendabiy.