초록 ▼

The invention relates to a photo-cured dental pit and fissure sealant composition for caries prevention: i) based on the multifunctional prepolymer mixture of 2,2-bis-(4-(2-hydroxy-3-methacryloyloxypropoxy)phenyl)propane ("Bis-GMA"), which has conventionally been used as dental pit and fissure seala

The invention relates to a photo-cured dental pit and fissure sealant composition for caries prevention: i) based on the multifunctional prepolymer mixture of 2,2-bis-(4-(2-hydroxy-3-methacryloyloxypropoxy)phenyl)propane ("Bis-GMA"), which has conventionally been used as dental pit and fissure sealant for caries prevention, and a multifunctional prepolymer formed by substituting hydrogen atoms in hydroxyl group with methacrylate groups in the Bis-GMA molecules; and ii) comprising a diluent, an inorganic filler, a photoinitiation system, and other additives. The dental pit and fissure sealant composition of the present invention is based on a multifunctional prepolymer mixture and has better physical and mechanical properties and biocompatibility than a conventional composition based on Bis-GMA only.

대표청구항 ▼

The invention relates to a photo-cured dental pit and fissure sealant composition for caries prevention: i) based on the multifunctional prepolymer mixture of 2,2-bis-(4-(2-hydroxy-3-methacryloyloxypropoxy)phenyl)propane ("Bis-GMA"), which has conventionally been used as dental pit and fissure seala

The invention relates to a photo-cured dental pit and fissure sealant composition for caries prevention: i) based on the multifunctional prepolymer mixture of 2,2-bis-(4-(2-hydroxy-3-methacryloyloxypropoxy)phenyl)propane ("Bis-GMA"), which has conventionally been used as dental pit and fissure sealant for caries prevention, and a multifunctional prepolymer formed by substituting hydrogen atoms in hydroxyl group with methacrylate groups in the Bis-GMA molecules; and ii) comprising a diluent, an inorganic filler, a photoinitiation system, and other additives. The dental pit and fissure sealant composition of the present invention is based on a multifunctional prepolymer mixture and has better physical and mechanical properties and biocompatibility than a conventional composition based on Bis-GMA only. method for producing polyols according to claim 1, wherein (variant (I)) a second step, called esterification, following to the first step of glycolysis comprises introducing into the glycolyzed medium a polyacid (PLA) and/or its derivatives and the deactivating agents (DES), then bringing the reactive medium to a temperature comprises between 170 and 240° C. under inert atmosphere, by distilling the formed water, and in that the last step comprises in distilling the free glycols under vacuum (3 mm HG35% higher oligomers (n>3): 35%. 7. The polyol according to claim 6, comprising at least at the trace state at least one of the bodies of the group comprising the manganese (Mn) and the zinc (Zn), as rest of the catalyst (CAT), and phosphorous (P) as rest of the deactivating agent (DES). 8. The method for producing polyols according to claim 1, wherein (variant III), before introduction of the deactivating agent and distillation of the free glycols: one proceeds following to the glycolysis to a distillation at high temperature of one part of the free glycols, which allows elimination of a large proportion of MEG, and secondly, one proceeds to a new step of transesterification following an addition of glycols and of polyalcohols having a functionality of f>2. 9. The method for producing polyols according to claim 8, wherein a polyalcohol having a functionality higher than two is the glycerol (GLR). 10. The method for producing polyols according to claim 1, wherein (variant IV) one carries out to perform the glycolysis, in addition to the DEG and to the DPG, polyalcohols having a functionality of f>2 and in the following a transesterification by means of a mixture of dimethyl esters. 11. A method for producing polyols comprising reacting polyalcohols on polyethylene terephthalate (PET) in the presence of a catalyst (CAT) of transesterification for performing a glycolysis reaction; deactivating the catalyst (CAT) of transesterification by a deactivating agent (DES); distilling off free glycols without rebalancing, under low vacuum (3 mmHg