[Studies on corrosion property of the anodic coating on the Mg alloy by micro-FTIR mapping].

Micro-FTIR mapping technology was used to monitor the amount and distribution of Mg(OH)2 on the anodic coating of magnesium alloy which was immersed in the 7.3 Wt% Na2SO4 solution for different time. In the solution, part of the MgO on the surface of the Mg alloy could gradually transform into Mg(OH)2 which could be detached from the Mg alloy surface and dis- solved into the solution. With immersion time of 2 h in 7.3 Wt% Na2SO4 solution 2h, FTIR mapping results showed that FTIR absorption signal of Mg(OH)2 was strongest and Mg(OH)2 was most on the surface of the anodic coating. After 4 hours, the content of Mg(OH)2 began to decrease, and the Mg alloy was etched gradually. The FTIR mapping results of another component Al2O3 with immersion time were almost similar to those of Mg(OH)2. The impedance of the oxide film was also analyzed using electrochemical impedance spectroscopy. It showed that the impedance changed with the immersion time and conformed to the corrosion law of the oxide coating. This research has a good guidance and application value for characterization of the anodic coating on magnesium alloy.

[Application of the fiber-reinforced resin in transitional denture after implantation].

PURPOSE: To evaluate the clinical effect of transitional restoration by the fiber-reinforced resin bonded bridge in the anterior zone after implantation. METHODS: Twenty-three cases with missing upper/lower central incisor, lateral incisor or canine were collected and randomly divided into the experimental group and the control group. One week after implant operation, the patients in the experimental group were repaired with the fiber-reinforced resin bonded bridge; while 2 weeks after implant operation, the patients in the control group were repaired with the removable partial denture. Then, the clinical effect was evaluated. The data was analyzed with SPSS18.0 software package for X(2) test. RESULTS: Patients in the experimental group were more satisfied with pronunciation than in the control group. The incidence of adverse reactions in the experimental group was significantly lower than that in the control group(P<0.05). Patients in both groups were quite satisfied with the esthetic effect(P>0.05). CONCLUSIONS: There are comfortable feeling and satisfactory aesthetic result with the fiber-reinforced resin bonded bridge. It didn't affect wound healing and could meet the requirement of transitional repair after implantation.

Morpholinium 4-amino-5-meth-oxy-2-methyl-benzensulfonate.

In the crystal structure of the title compound, C(4)H(10)NO(+)·C(8)H(10)NO(4)S(-), the components are linked by N-H⋯O hydrogen bonds, forming a centrosymmetric 2:2 aggregate. The aggregates are further connected by N-H⋯O hydrogen bonds between the anions, forming a double-tape structure along the a axis.

Hydrogen bonding and pi-pi interactions in a laminar structure: benzene-1,3-dicarboxylic acid-4-methylpyridine (1/2).

The title complex, C8H6O4.2C6H7N, consists of two crystallographically independent 1:2 clusters of benzene-1,3-dicarboxylic acid and 4-methylpyridine. Each cluster, the components of which are linked by O-H...N hydrogen bonds, is almost planar by alignment of C-H...O hydrogen bonds. Herring-bone ribbons of clusters are formed by other C-H...O hydrogen bonds, and these ribbons are further packed to form a laminar structure by pi-pi interactions.

Diethyl 3,8-dimethyl-4,7-diazadeca-2,8-dienedioate.

The title compound, C14H24N2O4, consists of two symmetric moieties related through a twofold axis. The whole molecule has a cis conformation. Both the ionic enol form and the non-ionic keto form make comparable contributions to the structure. In the crystal structure, infinite supramolecular chains are formed through N-H...O hydrogen bonds.

Ribbons of hydrogen-bonded rings in the 1:2 complex of pyromellitic acid and dimethyl sulfoxide.

In the title complex, pyromellitic acid-dimethyl sulfoxide (1/2), C(10)H(6)O(8).2C(2)H(6)OS, molecules of pyromellitic acid (1,2,4,5-benzenetetracarboxylic acid) and dimethyl sulfoxide, the latter being well ordered, are linked to each other by O-H.O hydrogen bonds. The formula unit displays crystallographic inversion symmetry. The packing consists of ribbons of hydrogen-bonded rings that can be described by graph set C(2)(1)(10)R(4)(2)(18).