4results about How to "Strong retention" patented technology

An adhesive composition comprising a copolymer (A), a crosslinking agent (B), and an aqueous medium, wherein the copolymer (A) has structural units derived from a monomer (a1), structural units derived from a monomer (a2) having a carboxyl group, and structural units derived from a monomer (a3) ​​having an alkoxysilyl group, wherein the monomer (a1) is composed of either or both of an alkyl (meth)acrylate having only one olefinic double bond and a hydrocarbon having only one olefinic double bond, wherein the structural units in the copolymer (A) derived from the monomer (a2) are relative to those derived from the monomer (a1). The content of the structural unit in the copolymer (A) is 1.0 part by mass or more and 12 parts by mass or less in 100 parts by mass, and the content of the structural unit derived from the monomer (a3) ​​in the copolymer (A) is 0.010 parts by mass or more and 3.5 parts by mass or less in 100 parts by mass relative to the structural unit derived from the monomer (a1). The crosslinking agent (B) contains one or more selected from polycarbodiimide compounds, polyepoxide compounds and polyisocyanate compounds, and the content of the crosslinking agent (B) is 0.010 parts by mass or more and 10 parts by mass or less in 100 parts by mass relative to the copolymer (A).

The invention discloses a full-dentition anchorage spiral expansion device, and relates to the technical field of orthodontic medical instruments. Comprising a spiral expander, a left anchorage assembly and a right anchorage assembly, the orthodontic device is characterized in that each anchorage assembly comprises a groove-shaped metal full crown covering the occlusal surface, the cheek side surface and the lingual side surface of a plurality of rear teeth on the same side, an arch expansion tongue rod fixedly connected with the near-middle lingual side surface of the metal full crown on the same side, and an arch expansion cheek rod fixedly connected with the near-middle cheek side surface of the metal full crown on the same side; the device is high in retention force, high in bony expansion efficiency, good in tooth protection, high in patient comfort level and wide in application range.

This invention provides a method for detecting trans-4,5-epoxy-2(E)-decaldehyde based on LC-MS / MS. First, trans-4,5-epoxy-2(E)-decaldehyde standards are prepared into standard solutions of different concentrations. Then, the standard solutions are derivatized by solid-phase extraction with 2,4-dinitrophenylhydrazine (DNPH) to obtain analytical samples containing standard solutions of different concentrations. Next, LC-MS / MS analysis is performed on the analytical samples of different concentrations of standard solutions to obtain a standard curve with standard concentration as the abscissa and peak area as the ordinate. The sample to be tested is detected using LC-MS / MS, and the content of trans-4,5-epoxy-2(E)-decaldehyde in the sample is determined using the standard curve. This invention achieves accurate qualitative and quantitative analysis of this compound and establishes a standardized platform for the role of this compound in systemic health and disease.