JPS6043452A - Ni alloy with low melting point for adhesive dental bridge - Google Patents

Abstract

PURPOSE:To obtain the titled alloy which can be melted in a conventional equipment and has high bonding strength to an adhesive resin by adding specified amounts of Cu, Co, In and Cr to Ni. CONSTITUTION:This alloy consists of, by weight, 3-30% Cu, 3-25% Co, 0.5- 25% In, 1-20% Cr and the balance Ni. The alloy has <=1,100 deg.C m.p. and can be melted with the heat source of a conventional equipment. The alloy has high bonding strength to an adhesive resin contg. 4-META or the like, and it also passes percolation test.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to (11) adhesive bridges etc. used in dentistry.
The present invention relates to low-melting point alloys, particularly Ni alloys, used for restorations, preservation restorations, orthodontic devices, etc.

Prior art In recent years, adhesive resins containing 4-META and the like have been commercialized, and because they adhere to tooth structure and some alloys, it has become possible to perform restorations without removing too much tooth structure (adhesive bridges). Refers to prosthetic/conservative restorations and orthodontic devices such as adhesive splints (adhesive bridges will be explained below as a representative example).

However, alloys with strong adhesive strength with adhesive resins
1300° such as Co-Cr alloy and Ni-Cr alloy
A high melting point alloy with a melting point around C (-limited).

However, these high melting point alloys (]) Casting shrinkage rate is high.

(2) Buildability is relatively poor.

(3) Casting defects are likely to occur.

(4) Melting requires a high temperature heat source such as a high frequency heating device.

This has disadvantages such as poor operability, and furthermore, the resulting prosthesis has poor compatibility, so when used as an adhesive bridge, there is a high risk of it falling off.

Alloys with a low melting point can be easily melted in a short period of time using a mixed flame made by adding oxygen (or air in some cases) to city gas, which dentists and dental technicians usually have or can easily install. It is possible to have a small number of defects, (
It is possible to obtain a cast body with good quality, and since there is little casting shrinkage, it is possible to easily obtain a cast body with good compatibility, which is most important for adhesive bridges.

Therefore, there has been a strong desire for the emergence of a Ni alloy that can be melted by a heat source obtained by conventional equipment and has a liquidus point of less than r, clO0°C.

By the way, as a guideline for general use as an alloy for adhesive bridges, after bonding the alloys with adhesive resin, they are placed in a water bath maintained at a temperature of 4°C and 60°C alternately (knee-length). The immersion operation is repeated (referred to as barcorayon test), and the adhesive strength after 1000 repetitions is required to be 150 Kp/cr1 or more.

The present invention aims to improve the drawbacks of the above-mentioned known alloys (
2, which has a liquid phase point of 1100°C or less,
4- It is an object of the present invention to provide a low melting point Ni alloy for dental adhesive bridges that has excellent adhesive strength with adhesive resins containing META and the like and satisfies the above-mentioned conditions.

A low melting point Ni alloy for dental adhesive bridges consisting of ~20 cm and the remainder being substantially Ni to T.

(2) Au, Pt, with a total weight ratio of 5 cm as an upper limit
Tribe.

Ag, Si, B, Ca-5i, Mn, T°'
+Mg+v*Nb+''+Ru, the low melting point Ni alloy for adhesive bridges according to item () above, which contains one or more of the above elements.

(= Such things.Here, the components of the alloy of the present invention and the reasons for limiting the components are as follows.

(Ni is one of the most common, popular and economical non-noble metal elements among the base metals constituting alloys for dental prostheses, and it also has the required resistance to discoloration and corrosion. It was selected because it is easy to obtain aesthetic properties and scientific and engineering properties, etc., and also has sufficient adhesive strength for adhesive resins such as 4META.The range of its ingredients is as follows: It was determined in consideration of the desired characteristics, feasibility, practicality, economic efficiency, etc.

(b) Cu is effective in lowering the liquidus point, but
If the content is less than 3% (hereinafter expressed in weight%), the effect cannot be obtained, and if it exceeds 30%, the corrosion resistance will be impaired, so the component ratio was limited to 3% or more and 30q&lt;

f) Co is effective in improving the corrosion resistance of the alloy and increasing the adhesive force with the adhesive resin, but its effect is obvious when the bulk is less than 71%, and when it exceeds 25%, it becomes liquid. Since the phase point is 1100° C. or higher, the temperature was limited to 3 degrees or higher and 25 degrees or lower.

) In increases the adhesive force with the adhesive resin and is effective in lowering the liquidus point, but if it is less than 0.5%, this effect is not observed, and if it exceeds 25%, the alloy becomes brittle. Therefore, the component ratio was limited to 0.5 inch or more and 25φ or less.

(,I;) Cr is effective in improving the corrosion resistance of the alloy and increasing the adhesive strength with the adhesive resin, but 1
If it is less than 20%, the effect cannot be obtained, and if it exceeds 20%, it becomes brittle, so the component ratio was limited to 1% or more and 2% or less.

HAu, Pt group, Ag, V, Nb, Y, R
t+ is added because it improves the scientific and engineering properties mainly by improving the state of the molten metal, making it easier to determine the casting timing, and making the crystals finer.

Also, Si, -B, Ca-5i, Mn, T'i
+ Mg is mainly effective as a deoxidizing agent, and as a result, it is easy to obtain a sound alloy, and it is expected to improve scientific and engineering properties.They are effective even when added alone or in combination. However, in any case, if the total sum does not exceed 5%, the effect will not increase much, and instead the science and engineering properties of the alloy will deteriorate, and defects such as increased brittleness will become noticeable, so It was decided that one or more elements should be added.

The method for producing the alloy of the present invention is as follows.

That is, high purity Ni (JIS-H2
104, Nl), electrolytic copper (JIS-H2121),
Cr (JIS-G2313), Co (99.2% manufactured by Nippon Mining Co., Ltd.), In (999% manufactured by Nippon Mining Co., Ltd.) etc. are used as the main components, and other minor additive elements are commercially available products or high purity JIS products. I used the one from These raw materials were weighed to obtain a desired blending ratio, and melted in an alumina crucible (a Magnesia crucible can also be used) in a high frequency melting furnace in the atmosphere.

The low melting point Ni alloy thus obtained forms a homogeneous-II phase, and its scientific and engineering properties as well as the adhesion strength in a trial in which the metals were bonded together using an adhesive resin containing 4 META are as follows. etc. are as shown in Table 1.

1 Examples of the present invention will be described in detail in Table 1 below.

(Leaving space below) Table 1 (Note) Values without units are weight %. 7I. Materials not listed in Table 1 above among those identified as subcomponent elements of the low melting point Ni alloy of the present invention. If, instead, they are mixed according to the predetermined weight ratio,
No substantial difference was observed between the purpose and effect of the final Ni alloy.

From these results, it is clear that the alloy of the present invention fully achieves the above-mentioned objects and effects and is preferable for dental applications.

Effects' As mentioned above, the alloy of the present invention can be easily melted and cast using commonly available city gas, has excellent operability and processability, and is compatible with adhesive resins. It has strong adhesion between the metals and satisfies the characteristics of a dental alloy in other respects, so it is useful for prosthetics and preservation such as dental adhesive bridges, restorations, and orthodontic devices, and is highly economical. A low melting point Ni alloy can be obtained.

Agent: Patent Attorney Ei 1) Hiroshi -

Claims (2)

[Claims] (1) Weight ratio: Cu: 3-30%, Co: 3-2
5%, In 0.5-25%, Cr 1-20%
+ The balance is substantially (2) A low melting point Ni alloy for dental adhesive bridges consisting of Ni. (2) Au, Pt with a total weight ratio of 5% as the upper limit
Tribe. Ag, Si, B, Ca-8i, Mr+, Ti
, Mg, V, Nb, Y. The low melting point Ni alloy for dental adhesive bridges according to claim 1, which contains one or more of the elements Ru.