OBJECTIVE: The aim of this study was to evaluate the effect of metal primers and thermocycling on shear bond strength between the orthodontic bracket and gold alloy. METHODS: For this study, 80 specimens made of dental gold alloy were divided into 8 groups based on the combination of metal primers (none, Alloy primer, Metaltite, V-primer) and thermocycling (with and without thermocycling). Shear bond strength testing was performed with a universal testing machine. Bond failure sites were classified by a modified ARI (Adhesive Remnant Index) score. RESULTS: All metal primer treated groups showed a significantly higher shear bond strength than the only sandblasting treated group without thermocycling (p<0.05). There were no significant differences on shear bond strength in the groups with thermocycling (p>0.05). Bond failure sites of the metal primer treated group without thermocycling occurred at gold alloy/adhesive interface, whereas there were no differences on bonding failure sites in the groups with thermocycling. CONCLUSIONS: These findings suggest that using metal primer on gold alloy enhances the initial bracket bond strength. But, this effect was not shown with thermocycling.
Alloys ; Collodion ; Methacrylates ; Orthodontic Brackets ; Thiones ; Thiouracil

OBJECTIVETo investigate the influence of three primers on the shear bond strength between cast titanium (Ti) and composite resin.

METHODSThe disks (n = 40) were cast by commercially pure (CP) Ti, which diameter were 8 mm and thick were 3 mm. The titanium surfaces were polished with silicon carbide sand papers under running water and then treated by sandblasting and acid (4%HF) etching. They were divided into four groups: control group (group A), treated with KH-570 (group B), treated with Alloy Primer (group C), treated with Metal photo primer (group D). After treatment, the specimens were evaluated for their shear bond strengths by universal testing machine. The values were statistically analyzed. The fractured surfaces were observed by scanning electron microscope (SEM).

RESULTSThe shear bond strengths of group A, B, C, D were (9.773 +/- 0.67), (11.463 +/- 0.82), (14.224 +/- 0.75), (13.157 +/- 0.73) MPa. There were significant differences in bond strength between A and B, C, D (P < 0.01). B and C, D had significant differences (P < 0.01). C and D had no significant differences (P>0.05).

CONCLUSIONKH-570, Alloy Primer, Metal photo primer significantly improve the bond strength of ceramage composite resin to cast titanium. KH-570 group bonding strength is lower than the the Alloy Primer group and Metal photo primer group.

Composite Resins ; Dental Bonding ; Materials Testing ; Methacrylates ; Shear Strength ; Silanes ; Silicates ; Thiones ; Titanium

OBJECTIVETo study the effects of two primers on the bond strengths between casting pure titanium and resin cements.

METHODSTwo sizes of specimen were fabricated by casting, which diameter were 4 mm and 5 mm respectively, and then were cut into 3 mm thick titanium discs. The titanium surfaces were polished with silicon carbide sand papers under running water and then treated by sandblasting. The two size of titanium discs were ultrasonic cleaned and treated with Alloy Primer, V-Primer or without primer, and then bonded in pairs with the resin-based cements Super-Bond C&B, Panavia F and Rely X Unicem. The specimens were then stored in distilled water (37 degrees C) for 24 h. Bond strengths were determined before and after 5 000 thermocycling. The titanium surface morphous and failure mode of the teat specimen were observed.

RESULTSThe shear bond strengths of titanium treated by Alloy Primer to Super-Bond C&B were (31.23 +/- 4.86), (34.08 +/- 3.36) MPa before and after 5 000 thermocycling, which higher than that of other combinations of primers and resin cements.

CONCLUSIONBond strengths were influenced by primers, resin cements, and their combinations. The highest bond strengths were the combinations of Alloy Primer and Super-Bond C&B.

Boron Compounds ; Dental Bonding ; Dental Enamel ; Fluorescence ; Methacrylates ; Methylmethacrylates ; Resin Cements ; Thiones ; Titanium ; Triazines

Objective: To establish a high performance liquid chromatography method for the determination of 2-thioxothiazolidine-4-carboxylic acid (TTCA) in urine. Methods: After acidification with hydrochloric acid, TTCA in urine was first extracted by ethyl acetate with excessive sodium chloride, then gradient separated by a symmetry C18 column and then detected by a diode array detector. The quantification was based on a working curve of external standard method. Results: The linear relationship of TTCA in urine was good in the range of 0.03-10.00 mg/L, and the correlation coefficient was 0.9999. The detection limit and minimum quantitative concentration of TTCA in urine were 0.008 mg/L and 0.027 mg/L. The intra-assay precision of the method was 0.9%-1.4%, the inter-assay precision was 1.3%-3.5%, and the average recovery was 85.0%-92.7% while the concentrations of TTCA in urine was 0.8, 2.0 and 8.0 mg/L, respectively (n=6) . Conclusion: The gradient elution high performance liquid chromatography method has simple operation and high sensitivity, and it is suitable for the determination of TTCA on a low level in urine for occupational workers exposure to carbon disulfide.
Carbon Disulfide ; Chromatography, High Pressure Liquid/methods* ; Humans ; Thiazoles/urine* ; Thiazolidines ; Thiones

PURPOSE: The purpose of this study was to evaluate the difference in shear bonding strength between resin cements to dental materials when a universal primer (Monobond plus) was applied in place of a conventional primer. MATERIALS AND METHODS: Four groups of testing materials: gold alloy (Argedent Euro, n = 16), non precious metal (T-4, n = 20), zirconia (Cercon, n = 20) and glass ceramic (IPS e.max press, n = 20), were fabricated into discs, which were embedded in an acrylic resin matrix. The gold alloy specimens were airborne-particle abraded, 8 of the specimens were coated with Metal primer II, while the remaining 8 specimens were coated with Monobond plus. The non precious and zirconia specimen were airborne-particle abraded then, the control group received Alloy primer coating, while the other was coated with Monobond plus. Glass ceramic specimens were etched. 10 specimens were coated with Monobond-S and the remaining specimens were coated using Monobond plus. On top of the surface, Multilink N was polymerized in a disc shape. All of the specimens were thermal cycled before the shear bonding strength was measured. Statistical analysis was done with Two sample t-test or Mann-Whitney U test (alpha=.05). RESULTS: There were no significant differences in bonding strength depending on the type of primer used in the gold alloy and glass ceramic groups (P>.05), however, the bonding strengths of resin cements to non precious metal and zirconia groups, were significantly higher when the alloy primer was used (P<.05). CONCLUSION: Within the limitations of this study, improvement of universal primers which can be applied to all types of restorations is recommended to precious metals and zirconia ceramics. But, the bond strengths of non precious metals and zirconia ceramics were significantly lower when compared to a 10-MDP primer. More research is needed to apply universal primers to all types of restorations.
Alloys ; Ceramics ; Collodion ; Dental Materials ; Glass ; Hypogonadism ; Metals ; Methacrylates ; Mitochondrial Diseases ; Ophthalmoplegia ; Polymers ; Resin Cements ; Thiones ; Zirconium

PURPOSE: There are very few reports of adverse drug reactions (ADR) and almost no study of drug provocation test (DPT) in Korean children. We aimed to assess the role of DPT in children with unpredictable ADRs, and compare the causative drugs and clinical characteristics between detailed history of ADRs and result of DPTs. METHODS: We included 16 children who were experienced ADRs referred to pediatric allergy clinic at Ajou University Hospital (January 2006 to December 2009). With various suspected drugs, 71 DPTs were done in 16 patients using our own protocol, and skin tests to antibiotics were combined in ADRs to antibiotics in medical history. RESULTS: There were 17 (23.9%) positive DPTs results out of 71 individual DPTs, and 11 patients (68.8%) from 16 patients were positive to at least one drug. Drugs causing positive reactions were acetaminophen in 5 (31%), Non-steroidal anti-inflammatory drugs in 4 (25%), penicillin in 3 (19%), cephalosporin in 2 (13%), and cotrimoxazole, macrolide and lactose in 1 each. CONCLUSION: DPT seems a safe and useful procedure to confirm causative drug and identify safely administering alternative drugs in children with ADR.
Acetaminophen ; Anti-Bacterial Agents ; Child ; Drug Toxicity ; Humans ; Hypersensitivity ; Lactose ; Penicillins ; Skin Tests ; Thiones ; Trimethoprim, Sulfamethoxazole Drug Combination

Both Fas and PMA can activate phospholipase D via activation of protein kinase Cbeta in A20 cells. Phospholipase D activity was increased 4 fold in the presence of Fas and 2.5 fold in the presence of PMA. The possible involvement of tyrosine phosphorylation in Fas-induced activation of phospholipase D was investigated. In five minute after Fas cross-linking, there was a prominent increase in tyrosine phosphorylated proteins, and it was completely inhibited by D609, a specific inhibitor of phosphatidylcholine-specific phospholipase C (PC-PLC). A tyrosine kinase inhibitor, genistein, can partially inhibit Fas-induced phospholipase D activation. There were no effects of genistein on Fas-induced activation of PC-PLC and protein kinase C. These results strongly indicate that tyrosine phosphorylation may in part account for the increase in phospholipase D activity by Fas cross-linking and D609 can block not only PC-PLC activity but also tyrosine phosphorylation involved in Fas-induced phospholipase D activation.
Animal ; Antibodies, Monoclonal/immunology/*pharmacology ; Antigens, CD95/immunology/*metabolism ; Bridged Compounds/*pharmacology ; Cell Line ; Cross-Linking Reagents ; Dose-Response Relationship, Immunologic ; Enzyme Activation ; Genistein/pharmacology ; Hydrolysis ; Lymphoma/pathology ; Mice ; Phospholipase C/*antagonists & inhibitors ; Phospholipase D/*metabolism ; Phosphorylation ; Phosphorylcholine/metabolism ; Solubility ; Thiones/*pharmacology ; Tumor Cells, Cultured ; Tyrosine/*metabolism ; Water/chemistry

Both Fas and PMA can activate phospholipase D via activation of protein kinase Cbeta in A20 cells. Phospholipase D activity was increased 4 fold in the presence of Fas and 2.5 fold in the presence of PMA. The possible involvement of tyrosine phosphorylation in Fas-induced activation of phospholipase D was investigated. In five minute after Fas cross-linking, there was a prominent increase in tyrosine phosphorylated proteins, and it was completely inhibited by D609, a specific inhibitor of phosphatidylcholine-specific phospholipase C (PC-PLC). A tyrosine kinase inhibitor, genistein, can partially inhibit Fas-induced phospholipase D activation. There were no effects of genistein on Fas-induced activation of PC-PLC and protein kinase C. These results strongly indicate that tyrosine phosphorylation may in part account for the increase in phospholipase D activity by Fas cross-linking and D609 can block not only PC-PLC activity but also tyrosine phosphorylation involved in Fas-induced phospholipase D activation.
Animal ; Antibodies, Monoclonal/immunology/*pharmacology ; Antigens, CD95/immunology/*metabolism ; Bridged Compounds/*pharmacology ; Cell Line ; Cross-Linking Reagents ; Dose-Response Relationship, Immunologic ; Enzyme Activation ; Genistein/pharmacology ; Hydrolysis ; Lymphoma/pathology ; Mice ; Phospholipase C/*antagonists & inhibitors ; Phospholipase D/*metabolism ; Phosphorylation ; Phosphorylcholine/metabolism ; Solubility ; Thiones/*pharmacology ; Tumor Cells, Cultured ; Tyrosine/*metabolism ; Water/chemistry

Monocyte chemoattractant protein-1 (MCP1) plays a key role in monocyte/macrophage infiltration to the sub-endothelial space of the blood vessel wall, which is a critical initial step in atherosclerosis. In this study, we examined the intracellular signaling pathway of IL-1beta-induced MCP1 expression using various chemical inhibitors. The pretreatment of a phosphatidylcholine (PC)-specific PLC (PC-PLC) inhibitor (D609), PKC inhibitors, or an NF-kappaB inhibitor completely suppressed the IL-1beta-induced MCP1 expression through blocking NF-kappaB translocation to the nucleus. Pretreatment with inhibitors of tyrosine kinase or PLD partially suppressed MCP1 expression and failed to block nuclear NF-kappaB translocation. These results suggest that IL-1beta induces MCP1 expression through activation of NF-kappaB via the PC-PLC/PKC signaling pathway.
Active Transport, Cell Nucleus/drug effects ; Aorta/pathology ; Atherosclerosis/immunology/metabolism ; Bridged Compounds/pharmacology ; Cell Nucleus/*metabolism ; Cells, Cultured ; Chemokine CCL2/*biosynthesis ; Estrenes/pharmacology ; Genistein/pharmacology ; Humans ; Interleukin-1beta/metabolism ; Myocytes, Smooth Muscle/drug effects/immunology/*metabolism/pathology ; NF-kappa B/*metabolism ; Phospholipases/antagonists & inhibitors ; Protein-Tyrosine Kinases/antagonists & inhibitors ; Pyrrolidinones/pharmacology ; Recombinant Proteins/metabolism ; Signal Transduction/*drug effects ; Thiones/pharmacology

OBJECTIVETo investigate the expression of serine protease Omi/HtrA2 in kidneys of postasphyxial neonatal rats, and to study the effects of Ucf-101 on apoptosis and the expression of Omi/HtrA2 in these rats.

METHODSSeventy-two neonatal Wistar rats of 7-10 days old were randomly divided into 3 groups: control, postasphyxial model, Ucf-101-treated postasphyxialThe postasphyxial model was established by normobaric asphyxiaExpression of Omi/HtrA2 was determined with streptavidin-peroxidase immunohistochemistry 2, 24 and 48 hrs after asphyxia. Terminal deoxynuleotidyl-mediated nick end labeling (TUNEL) was used to ascertain the apoptosis of renal cells.

RESULTSCompared with the control group, OmiHtrA2 expression in renal cells began to increase 2 hrs after asphyxia and peaked at 24 hrs. The expression of Omi/HtrA2 in the Ucf-101-treated postasphyxial group was significantly lower than that in the postasphyxial model group (P<0.01). TUNEL-positive cells began to increase 2 hrs after asphyxia and peaked at 24 hrs in the postasphyxial model group when compared with the control group. The number of TUNEL-positive cells in the Ucf-101-treated postasphyxial group was significantly lower than that in the postasphyxial model group at all time points (P<0.01).

CONCLUSIONSThe expression of Omi/HtrA2 in kidneys is increased in postasphyxial neonatal rats. The increased Omi/HtrA2 expression may play an important role in the development of postasphyxial renal injury. Treatment with Ucf-101 can reduce the expression of Omi/HtrA2 in kidneys of postasphyxial neonatal rats and thus reduce renal tububar epithelial cell apoptosis.

Animals ; Animals, Newborn ; Apoptosis ; drug effects ; Asphyxia Neonatorum ; drug therapy ; metabolism ; pathology ; Female ; High-Temperature Requirement A Serine Peptidase 2 ; Humans ; Immunohistochemistry ; In Situ Nick-End Labeling ; Infant, Newborn ; Kidney ; chemistry ; Male ; Mitochondrial Proteins ; analysis ; antagonists & inhibitors ; Pyrimidinones ; pharmacology ; therapeutic use ; Rats ; Rats, Wistar ; Serine Endopeptidases ; analysis ; Thiones ; pharmacology ; therapeutic use