40results about How to "Low polymerization shrinkage" patented technology

The invention relates to a radically polymerizable monomer of formula (I)whereinW1 and W2 in each case independently represent H or X—R—Y—PG, wherein at least one of W1 and W2 represents X—R—Y—PG,X in each case independently is missing or represents an ether, ester, amide, urethane or urea group,Y in each case independently is missing or represents an ether, ester, amide, urethane or urea group,R in each case independently is missing or represents a C1-C16 alkylene radical which can be interrupted by one or more O atoms, wherein R can be missing only if X and / or Y is simultaneously also missing, andPG in each case independently represents a cyclic, ring-opening polymerizable group,a, b, c and d independently of each other can take the values 3 to 10.The invention also relates to polymerizable compositions which comprise the monomers according to the invention, as well as their use as dental materials and for the preparation of dental materials, in particular composites, cements, adhesives or coatings.

The present invention discloses a methacrylate macromonomer containing a fluorine structure but not containing a bisphenol A structure, preparation method therefor and application thereof. The prepared methacrylate macromonomer containing fluorine structure not containing bisphenol A structure can be used as an organic monomer component of a dental restorative material. The macromonomer has the advantages of large molecular weight, large molecular volume, not containing a bisphenol A structure and containing a fluorine structure. Therefore, when the macromonomer is polymerized, the polymerization volume shrinkage is small and a polymerization product has a good mechanical property.

Radically polymerizable, difunctional phenylene sulfide according to Formula Iin which X, Y independently of each other in each case are absent or are O or NR6, R1, R2 independently of each other in each case are H, a linear or branched C1 to C10 alkyl radical, —OR7, —SR8, Cl or Br, R3 is absent or is a C1-C10 alkylene radical which can be interrupted by O or S, R4 is absent or is a C1-C10 alkylene radical which can be interrupted by O or S, wherein R3 and R4 cannot be absent at the same time, R5 is H or a C1-C5 alkyl radical, R6, R7, R8 independently of each other in each case are H or a linear or branched C1 to C10 alkyl radical, a, b, c, d independently of each other in each case are 0 or 1 and e is 1 or 2.

The invention discloses a nano-composite resin with low shrinking percentage for dental repair and a preparation method thereof. The composite resin comprises an organic matrix, an initiator system and inorganic filler. The composition resin is characterized by further comprising oligomeric polysilsesquioxane nano particles. The composition comprises the components in percentage by weight as follows: 18-29% of organic matrix, 1-2% of initiator system, 59-78% of inorganic filler and 2-20% of oligomeric polysilsesquioxane nano particles. The preparation method comprises the following steps of: uniformly mixing all the components to obtain un-cured nano composite resin paste; then, vacuumizing to remove bubbles out of the composite resin paste material; and finally, placing into a mould and curing by visible lights to obtain the nano-composite resin with low shrinking percentage for dental repair. Due to addition of POSS (Polysilsesquioxane), the polymerization shrinking percentage of the composite resin is remarkably reduced and the polishing retentivity and the wear-resisting durability of the material are further improved. The composite resin provided by the invention has the advantages that raw materials are low in price, equipment requirement is low, and the preparation process is simple, easy to operate and suitable for industrialized production.

The invention relates to a bile acid-containing cross-linking monomer and a preparation method thereof. The bile acid-containing cross-linking monomer is a compound of formula (I), wherein, R1=H or CH3; R2=H, OH or OOCC (R1)=CH2; R3=H, OH or OCOC (R1)=CH2; R4 =CH3 or (CH2CH2)nOOCC(R1)=CH2, n=1-3. Vinyl-containing acid chlorides react with bile acid derivatives in the presence of organic tertiary amines to give crosslinking monomers containing two, three and four polymerizable groups. This type of cross-linking monomer has a small polymerization shrinkage, and can be used to replace the organic matrix of dental filling composite materials and prepare the matrix of other hard tissue (bone, joint, tooth, etc.) repair materials. ∴

The invention relates to a preparation method of dental restoring resin taking silicon dioxide and cluster of the silicon dioxide as stuffing. The method comprises the following steps: (1) preparing the cluster of the silicon dioxide by using the reaction between bonded groups on the surface of silicon dioxide; (2) adding the silicon dioxide, the cluster of the silicon dioxide, an amine catalyst, and a double-bond-containing silane coupling agent in a cyclohexane solvent, thus obtaining surface-functionalized inorganic general stuffing after reaction; and (3) uniformly mixing the surface-functionalized inorganic general stuffing and an organic resin matrix with a light initiator and finally carrying out photo-curing for 40-120s, thus obtaining the dental restoring resin. The method is simple in preparation technology, easy to operate and suitable to industrial production; the raw materials are cheap in price; and the obtained dental restoring composite resin has a low polymerization-shrinkage ratio and excellent wear-resistant performance and is expected to be used clinically.