Root apex filling material and preparation method thereof

Abstract

The invention relates to a root apex filling material which comprises the following components in mass percent: 35%-44% of natural hydroxyapatite, 35%-44% of tetracaicium phosphate of which the particle size is 0-50mu m and the mean particle size is 2-8mu m, 7%-9% of polyacrylic acid of which the mean molecular weight is 30000-50000, 1.5%-2.5% of citric acid and 1.5%-2.5% of sodium citrate. The natural hydroxyapatite, the tetracaicium phosphate, the polyacrylic acid, the citric acid and the sodium citrate are mixed, ground and sieved by a 200-mesh sieve to form the root apex filling material.The preparation method comprises the following concrete steps of: mixing, grinding and sieving the natural hydroxyapatite, the tetracaicium phosphate, the polyacrylic acid, the citric acid and the sodium citrate by a 200-mesh sieve to obtain the root apex filling powder, preserving the root apex filling powder in a dry place for later use; using ionized water, polyethylene glycol (PEG) 400 or glycerol as a liquid phase, mixing the prepared powder with the liquid phase in a mass ratio of (4-5):1, and filling into a mold to prepare the root apex filling material.

Description

technical field [0001] The invention relates to a preparation of a hard tissue repair material and a method thereof, in particular to a tooth root apex filling material and a preparation method thereof. Background technique [0002] Pulp disease and periapical disease are not only common clinical diseases in oral medicine, but also oral diseases that cause severe pain to patients. If they are not diagnosed and treated in time or treated improperly, they can cause severe pain to the patient, lead to the extraction of the affected tooth, affect the patient's chewing and aesthetic functions, etc.; and even become oral lesions, causing subacute bacterial endocarditis , rheumatic or rheumatoid arthritis, glomerulonephritis, etc., thus causing great pain to the patient's physical and mental health. [0003] Root canal therapy (root canal therapy, RCT) is a method for the treatment of pulp disease and periapical disease, and its success rate is over 85%. However, there are still ...

AI Technical Summary

Problems solved by technology

For example: silver amalgam is now a material that will be eliminated due to the toxicity of mercury and poor biocompatibility; although materials such as zinc oxide, glass ionomer cement, and composite resin have good biocompatibility and physical and chemical properties, It can form a better physical sealing of the cavity prepared by root canal surgery, but their common defect is that they do not have biological activity, cannot promote the deposition of cementum on its surface, and cannot achieve the effect of physiologically sealing the root tip; MTA Although it is an ideal bioactive material, it has significant advantages such as moisture curability, good sealing, biocompatibility and bioactivity, but it also has long curing time (3h), high alkalinity (pH value, etc.) : 10-12), low adhesion to tooth tissue, high price (about 800 yuan / g), all imported materials and other defects

Therefore, so far, there is no ideal apical filling material

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