JP2626811B2 - Curable glue root canal filling material - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a curable glue root canal filling material used as a root canal filling material after treatment of a medullary root canal or an infected root canal in dental treatment.

[Conventional technology]

In the root filling operation in dental treatment, the root canal cavity after the removal of the medulla or after the treatment of the infected root canal is sealed by applying a root canal filling material to protect and heal the apical wound, and to prepare the tooth after the operation. This is a treatment aimed at preservation of

Conventionally, such treatments include non-hardening glue root canal filling materials (for example, formalin-based) and hardening glue root canal filling materials (for example, for promoting healing of root apical tissue or treating bone scars). , Zinc oxide-eugenol system) or the use of a solid root canal filler (eg, gutta-percha point) for physical occlusion, or the use of a solid root canal filler
In order to fill the dead space between the root canal wall and the master point, a method of using a glue root canal filling material (sealer) in combination is used.

Among these, the non-hardening glue root canal filling material can be expected to heal the tissue, but it is not hardened in the root canal, so there is concern about long-term application. In addition, the solid root canal filling material only physically closes, and tissue healing cannot be expected.

On the other hand, a curable glue root canal filling material that hardens in the root canal after a certain period of time after kneading can be expected to achieve both the purpose of tissue healing and root canal occlusion. Also, when used together with a solid root canal filler as a sealer, the solid root canal filler such as gutta-percha point is fixed to the root canal wall,
It can be expected that there will be no dead space.

As the curable glue root canal filling material, zinc oxide-eugenol cement, which is mainly composed of zinc oxide and kneaded with eugenol, has been widely used.
However, since the components of the cement are chemically different from the components of the teeth, they are not necessarily satisfactory materials in terms of biocompatibility.

In order to solve this problem, recently, α-tricalcium phosphate powder having a tissue similar to the main components of bones and teeth, or α-tricalcium phosphate powder and hydroxyapatite powder as main components, and guaiacol A curable glue root canal filler used by kneading the above is proposed (for example, JP-A-62-255403).

[Problems to be solved by the invention]

However, in the above-mentioned known art, there is a problem that the collapse rate of the cured product is high and the required performance as a root canal filler is not satisfied.

[Means for solving the problem]

The present invention relates to a curable composition comprising a powder containing tetracalcium phosphate powder as a main component and a liquid formulation containing eugenol, which has a composition similar to that of bone and teeth as in α-tricalcium phosphate. It relates to a glue root canal filling material. The curable glue root canal filler of the present invention has excellent tissue affinity,
It has a low disintegration rate of the cured product and has high performance as a root canal filler.

That is, the present invention comprises tetracalcium phosphate having excellent tissue affinity as a main component, and calcium hydroxide, which is an active ingredient for tissue healing, as a hardener, and as a water repellent and an operability improver. The present invention relates to a powder-liquid kneading type curable glue root canal filler composed of a powder containing rosin and an X-ray contrast material and a liquid containing eugenol.

Each component of the powder in the curable paste root canal filler of the present invention is 40 to 50 tetracalcium phosphate based on the total weight of the powder.
Wt%, calcium hydroxide 2-15 wt%, rosin 15-35
% By weight, and preferably 15 to 35% by weight of bismuth subcarbonate and / or barium sulfate as an X-ray contrast medium.

Although Eugenol is used as the liquid agent, clove oil containing Eugenol as a main component can also be used.

Powder (weight: unit g) and liquid (capacity: unit ml) are 2.
Knead and use at a ratio of 5 to 5.5 (g / ml) (this ratio is called powder-liquid ratio). If the ratio is within this range, kneading and root canal filling operations are easy, and the dental science and engineering properties as the curable glue root canal filling material, that is, the curing time and the coating thickness are appropriate, especially The disintegration rate is extremely low, and excellent performance after curing is maintained for a long time.

 Hereinafter, the present invention will be described in more detail by way of examples.

(Examples and Comparative Examples)

(Production Example 1) Calcium hydrogen phosphate dihydrate and calcium carbonate are uniformly mixed at a molar ratio of 1: 1 and calcined at a temperature of 1600 ° C. for 2 hours and then quenched to synthesize tetracalcium phosphate. did.
This tetracalcium phosphate is finely pulverized with a ball mill,
The powder was passed through a mesh sieve to obtain tetracalcium phosphate powder having a predetermined particle size.

(Examples 1 to 4) Powders shown in Table 1 were mixed with a powder prepared by mixing other powder components in the proportions shown in Table 1 with the tetracalcium phosphate powder produced in Production Example 1 and Eugenol as a liquid. The mixture was kneaded at the liquid ratio, and the curing time, the coating thickness and the disintegration rate were measured in accordance with ISO-6876. The results are shown in Table 1.

The root canal filling material of the present invention has a very low disintegration rate and does not dissolve in tissue fluid after hardening, and is an extremely excellent root canal filling material having excellent dental engineering and engineering properties.

(Comparative Examples 1 and 2) An α-tricalcium phosphate-based powder mixed at a ratio shown in Table 1 and a liquid were kneaded at a powder-liquid ratio of 3.0, and the curing time and coating film thickness were determined in accordance with ISO-6876. The bulk and the decay rate were measured. The results are shown in Table 1.

The root canal filler of the comparative example has a high disintegration rate and dissolves in the tissue fluid after hardening, and is no longer useful as a filler.

[Effect of the Invention] The curable glue root canal filling material of the present invention has excellent biocompatibility because tetracalcium phosphate as a main component is finally converted into hydroxyapatite in the root canal. The antimicrobial properties of Eugenol and the medicinal properties of calcium hydroxide are expected to promote the protection and healing of root wounds. Further, the root canal filling material of the present invention is used for a root canal filling operation by kneading a powder and a liquid agent, but the operability at that time is easy, and the root canal is filled up to the details of the root canal. Since the curing is completed at this point, it is also useful as a sealer for filling the root canal together with the gutta-perture point, and complete closure of the root canal can be achieved. Furthermore, since the disintegration rate of the cured product is low, there is no possibility that the root canal filling material is dissolved in the tissue fluid after curing. Further, by blending bismuth subcarbonate and / or barium sulfate as the X-ray contrast material, the composition has a suitable X-ray contrast property, and the state of root canal filling can be easily observed.

Claims (1)

(57) [Claims] 1. A curable glue root canal filling material comprising tetracalcium phosphate powder, calcium hydroxide, rosin, X-ray contrast material and eugenol.