U.S. patent application number 10/263845 was filed with the patent office on 2004-04-08 for glass powder for glass ionomer cement.
This patent application is currently assigned to GC CORPORATION. Invention is credited to Hirasawa, Michiko, Kato, Shinichi, Takuno, Makoto.
Application Number | 20040067359 10/263845 |
Document ID | / |
Family ID | 32738553 |
Filed Date | 2004-04-08 |
United States Patent
Application |
20040067359 |
Kind Code |
A1 |
Hirasawa, Michiko ; et
al. |
April 8, 2004 |
Glass powder for glass ionomer cement
Abstract
To provide a glass powder for glass ionomer cement, which has an
effect for enhancing an adhesive force to a tooth structure as
compared with the conventional glass powders for glass ionomer
cement, and which is particularly suitable for a paste-like glass
ionomer cement composition, the glass powder for glass ionomer
cement is subjected to a surface treatment with at least one silane
coupling agent having at least one group selected from a mercapto
group, an amino group, and an epoxy group, or a surface treatment
with at least one silane coupling agent having at least one group
selected from a mercapto group, an amino group, and an epoxy group
and with at least one vinyl group- or (meth)acryloyl
group-containing silane coupling agent at the same time.
Inventors: |
Hirasawa, Michiko; (Tokyo,
JP) ; Kato, Shinichi; (Tokyo, JP) ; Takuno,
Makoto; (Tokyo, JP) |
Correspondence
Address: |
OBLON, SPIVAK, MCCLELLAND, MAIER & NEUSTADT, P.C.
1940 DUKE STREET
ALEXANDRIA
VA
22314
US
|
Assignee: |
GC CORPORATION
Tokyo
JP
|
Family ID: |
32738553 |
Appl. No.: |
10/263845 |
Filed: |
October 4, 2002 |
Current U.S.
Class: |
428/391 ;
428/406 |
Current CPC
Class: |
A61K 6/891 20200101;
A61K 6/54 20200101; A61K 6/77 20200101; Y10T 428/2996 20150115;
A61K 6/891 20200101; A61K 6/30 20200101; A61K 6/889 20200101; A61K
6/54 20200101; A61K 6/30 20200101; A61K 6/889 20200101; A61K 6/887
20200101; A61K 6/887 20200101; A61K 6/30 20200101; A61K 6/889
20200101; A61K 6/889 20200101; A61K 6/54 20200101; A61K 6/889
20200101; A61K 6/889 20200101; A61K 6/54 20200101; A61K 6/889
20200101; A61K 6/887 20200101; A61K 6/889 20200101; A61K 6/30
20200101; A61K 6/30 20200101; A61K 6/30 20200101; Y10T 428/2962
20150115; A61K 6/54 20200101; A61K 6/887 20200101; A61K 6/54
20200101; A61K 6/887 20200101; A61K 6/30 20200101; A61K 6/54
20200101; A61K 6/887 20200101; C03C 17/30 20130101; C08L 33/14
20130101; C08L 63/10 20130101; C08L 33/14 20130101; C08L 33/068
20130101; C08L 33/068 20130101; C08L 63/10 20130101; C08L 33/14
20130101; C08L 33/14 20130101; C08L 43/04 20130101; C08L 63/10
20130101; C08L 63/10 20130101; C08L 33/14 20130101; C08L 33/068
20130101; C08L 43/04 20130101; C08L 43/04 20130101; C08L 63/10
20130101; C08L 33/068 20130101; C08L 33/14 20130101; C08L 43/04
20130101; C08L 43/04 20130101; C08L 43/04 20130101; C08L 33/068
20130101; C08L 43/04 20130101; C08L 33/14 20130101; C08L 43/04
20130101; C08L 33/14 20130101; C08L 33/068 20130101; A61K 6/833
20200101; A61K 6/54 20200101; A61K 6/836 20200101; A61K 6/30
20200101; C08L 33/068 20130101; C08L 63/10 20130101; C08L 33/068
20130101; C08L 63/10 20130101; C08L 63/10 20130101 |
Class at
Publication: |
428/391 ;
428/406 |
International
Class: |
D02G 003/00 |
Claims
What is claimed is:
1. A glass powder for glass ionomer cement having been subjected to
a surface treatment with at least one silane coupling agent having
at least one group selected from a mercapto group, an amino group,
and an epoxy group.
2. The glass powder for glass ionomer cement according to claim 1,
wherein 100 parts by weight of a surface-untreated glass powder for
glass ionomer cement is subjected to a surface treatment with 0.1
to 10 parts by weight of at least one silane coupling agent having
at least one group selected from a mercapto group, an amino group,
and an epoxy group.
3. The glass powder for glass ionomer cement according to claim 1,
wherein 100 parts by weight of a surface-untreated glass powder for
glass ionomer cement is subjected to a surface treatment with 0.1
to 10 parts by weight of at least one silane coupling agent having
at least one group selected from a mercapto group, an amino group,
and an epoxy group and a surface treatment with 0.1 to 10 parts by
weight of at least one vinyl group- or (meth)acryloyl
group-containing silane coupling agent.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a glass powder for glass
ionomer cement to be used in the medicine, particularly the
dentistry. More specifically, the present invention relates to a
glass powder for glass ionomer cement, which has an effect for
improving an adhesive force to a tooth structure as compared with
the conventional glass powders for glass ionomer cement, and which
is particularly suitable for a paste-like glass ionomer cement
composition.
[0003] 2. Description of the Conventional Art
[0004] A glass ionomer cement is used by making an acid such as a
polycarboxylic acid and a glass powder for glass ionomer cement
reacted in the presence of water and curing the reacted mixture.
This glass ionomer cement has characteristics such that it is
extremely good in bioaffinity; its cured material is translucent
and superior in aesthetics; it has a superior adhesive force to a
tooth structure such as an enamel and a dentin; and that, when a
fluoride is contained in the glass powder, it has a resisting
action to caries by the fluoride. Accordingly, the glass ionomer
cement is a dental material to be widely used in the dental field,
including filling of a caries cavity, cementing of crowns, inlays,
bridges, or orthodontic bands, lining of a cavity, sealing of a
root canal, core construction, and preventive sealing.
[0005] Further, by adding a polymerizable resin component to the
glass ionomer cement, not only the brittleness caused by moisture
at the initial curing, that has hitherto been said to be a drawback
of the glass ionomer cement, is inhibited, but also the mechanical
strengths and physical properties such as adhesiveness to a tooth
structure are improved, nowadays. In addition, resin-reinforced
glass ionomer cements having superior adhesiveness to dental
metals, resins, porcelains, etc. have also been developed.
Moreover, glass ionomer cements, which can be quickly cured by
visible light by using a photopolymerization catalyst as a catalyst
for polymerizing a polymerizable resin component, have been
developed, too. Thus, the utilization thereof has been a lot more
expanded.
[0006] As described above, the glass ionomer cements have various
characteristics and are placing on the market in various forms.
However, general dental glass ionomer cements are constituted of a
powder component and a liquid component, and therefore, one of
disadvantages thereof is complication of operations such as
measuring and mixing. For this reason, there has been developed a
paste-like glass ionomer cement composition comprising two pastes
of a paste comprised of a glass powder for glass ionomer cement and
a polymerizable monomer (or water and a thickener) as major
components and a paste comprised of a polycarboxylic acid and water
(or a polymerizable monomer) as major components, with which a
polymerization initiator is properly compounded according to the
polymerization process of the polymerizable monomer.
[0007] However, though such a paste-like glass ionomer cement is
superior in operation easiness during mixing, it was insufficient
in adhesive force to a tooth structure as compared with the
conventional glass ionomer cements using a mixture of a powder and
a liquid.
SUMMARY OF THE INVENTION
[0008] The invention is aimed to overcome the above-described
defects of the conventional paste-like glass ionomer cements and
provide a glass powder for glass ionomer cement capable of
obtaining a glass ionomer cement cured material having a high
adhesive force to a tooth structure.
[0009] In order to achieve the above-described aim, we, the present
inventors made extensive and intensive investigations. And, they
paid attention to the matter that though a paste-like glass ionomer
cement is superior in operation easiness, in order to maintain a
strength necessary as the glass ionomer cement, it is required to
contain a glass powder for glass ionomer cement in an amount as
high as possible in the composition, and hence, wettability of the
paste to a tooth surface is lowered so that the adhesive force to a
tooth structure is insufficient. As a result, it has been found
that, when the glass powder for glass ionomer cement is subjected
to a surface treatment with a specific silane coupling agent, the
wettability is enhance so that the adhesive force of the glass
ionomer cement to the tooth structure can be enhanced, leading to
accomplishment of the present invention.
[0010] Specifically, the present invention is concerned with a
glass powder for glass ionomer cement having been subjected to a
surface treatment with at least one silane coupling agent having at
least one group selected from a mercapto group, an amino group, and
an epoxy group. It is preferred that 100 parts by weight of a
surface-untreated glass powder for glass ionomer cement is
subjected to a surface treatment with 0.1 to 10 parts by weight of
at least one silane coupling agent having at least one group
selected from a mercapto group, an amino group, and an epoxy group;
and that 100 parts by weight of a surface-untreated glass powder
for glass ionomer cement is subjected to a surface treatment with
0.1 to 10 parts by weight of at least one silane coupling agent
having at least one group selected from a mercapto group, an amino
group, and an epoxy group and a surface treatment with 0.1 to 10
parts by weight of at least one vinyl group- or (meth)acryloyl
group-containing silane coupling agent at the same time.
DETAILED DESCRIPTION OF THE INVENTION
[0011] Examples of a silane coupling agent having at least one
group selected from a mercapto group, an amino group, and an epoxy
group, which can be used for the glass powder for glass ionomer
cement according to the present invention, include
.gamma.-mercaptopropyl trimethoxysilane as a silane coupling agent
having at least one mercapto group; N-.beta.(aminoethyl)
.gamma.-aminopropylmethyl dimethoxysilane, N-.beta.(aminoethyl)
.gamma.-aminopropyl trimethoxysilane, N-.beta.(aminoethyl)
.gamma.-aminopropyl triethoxysilane, .gamma.-aminopropyl
trimethoxysilane, .gamma.-aminopropyl triethoxysilane, and
N-phenyl-.gamma.-aminopropyl trimethoxysilane as a silane coupling
agent having at least one amino group; and .gamma.-glycidoxypropyl
trimethoxysilane, .gamma.-glycidoxypropylmethyl diethoxysilane,
.gamma.-glycidoxypropyl triethoxysilane, and
.beta.-(3,4-epoxycyclohexyl)ethyl trimethoxysilane as a silane
coupling agent having at least one epoxy group.
[0012] In the glass powder for glass ionomer cement according to
the present invention, it is preferred that the surface treatment
with at least one silane coupling agent having at least one group
selected from a mercapto group, an amino group, and an epoxy group
is carried out in a manner such that 100 parts by weight of a
surface-untreated glass powder for glass ionomer cement is
subjected to a surface treatment with 0.1 to 10 parts by weight of
at least one silane coupling agent having at least one group
selected from a mercapto group, an amino group, and an epoxy group.
When the amount of the at least one silane coupling agent having at
least one group selected from a mercapto group, an amino group, and
an epoxy group is less than 0.1 parts by weight, the desired effect
is hardly obtained even when the surface treatment is carried out.
On the other hand, when it exceeds 10 parts by weight, the function
of the glass powder for glass ionomer cement to react with an acid
trends to be inferior.
[0013] The glass powder for glass ionomer cement before the surface
treatment in the glass powder for glass ionomer cement according to
the present invention is a glass powder comprised of silica and
alumina as major components. Specific examples include
fluoroaluminosilicate glasses comprised of silica and alumina as
major components and having, for example, calcium fluoride,
aluminum fluoride, or aluminum phosphate mixed therewith, as
disclosed in Japanese Patent Laid-Open No. 26925/1996. Of these
fluoroaluminosilicate glasses is preferred a dental
fluoroaluminosilicate glass powder containing 10 to 21% by weight
of Al.sup.3+, 9 to 21% by weight of Si.sup.4+ and 1 to 20% by
weight of F.sup.- as components and further containing Sr.sup.2+
and Ca.sup.2+ in a total sum of 10 to 34% by weight. Besides, any
glass powders comprised of silica and alumina as major components
and reactive with an acid can be used as the glass powder for glass
ionomer cement before the surface treatment in the present
invention. Also, an aluminosilicate glass powder comprised of
silica and alumina as major components and having, for example,
phosphorus pentoxide mixed therewith can be used.
[0014] With respect to the glass powder for glass ionomer cement
according to the present invention, 100 parts by weight of a
surface-untreated glass powder for glass ionomer cement may be
subjected to a surface treatment with 0.1 to 10 parts by weight of
at least one silane coupling agent having at least one group
selected from a mercapto group, an amino group, and an epoxy group
and a surface treatment with 0.1 to 10 parts by weight of at least
one vinyl group- or (meth)acryloyl group-containing silane coupling
agent at the same time. When the surface-untreated glass powder for
glass ionomer cement are subjected to a surface treatment with
these at least two silane coupling agents, the reduction of the
physical properties of the cured material can be suppressed. As a
result, the physical properties on an interface with an adherend
are enhanced, leading to an increase in the adhesive force to the
tooth structure. Examples of the polymerizable vinyl group- or
(meth)acryloyl group-containing silane coupling agent that is used
for the surface treatment include vinyl-based silane coupling
agents such as vinyl trimethoxysilane, vinyl triethoxysilane,
.gamma.-methacryloxypropyl trimethoxysilane,
.gamma.-methacryloxypropylmethyl dimethoxysilane, vinyl
trichlorosilane, and vinyl tris-(2-methoxyethoxy)silane; and
unsaturated carboxylic acids such as methacrylic acid, acrylic
acid, and maleic acid.
[0015] In the glass powder for glass ionomer cement according to
the present invention, a process for treating the surface-untreated
glass powder for glass ionomer cement with the silane coupling
agent having at least one group selected from a mercapto group, an
amino group, and an epoxy group can be carried out according to the
conventional silane coupling treatment process. For example, is
employable a process in which the silane coupling agent is
dissolved in a solution such as ethanol, and the resulting solution
is added to the glass powder for glass ionomer cement to form a
dispersion, which is then heat treated at a temperature of about 90
to 160.degree. C. for 0.5 to 5 hours, followed by allowing it to
stand for cooling. In this process, a concentration of the silane
coupling agent to be dissolved in ethanol is preferably 1 to 20% by
weight. When the concentration of the silane coupling agent to be
dissolved in ethanol is less than 1% by weight, the effect to be
brought by the addition of the silane coupling agent is hardly
obtained, whereas when it exceeds 20% by weight, condensation among
the silane coupling agent begins so that the dispersion tends to be
hardly formed. In the case where the surface treatment is carried
out using the silane coupling agent having at least one group
selected from a mercapto group, an amino group, and an epoxy group,
and the silane coupling agent having the vinyl group- or
(meth)acryloyl group-containing silane coupling agent, there are
employable a process in which the both silane coupling agents are
mixed together with ethanol to carry out the silane treatment at
the same time; and a process in which the silane coupling agents
are separately dissolved in a solution such as ethanol, and the
both solutions are added simultaneously to form a dispersion.
[0016] The surface-untreated glass powder for glass ionomer cement
that is used for the glass powder for glass ionomer cement
according to the present invention may be subjected to a surface
treatment with an acid or a fluoride prior to the surface treatment
with the silane coupling agent, in the same manner as in the
conventional glass powder for glass ionomer cement. By the surface
treatment with an acid or a fluoride, not only the fluidity of a
cement slurry increases to improve the operation easiness, but also
the curing can be made sharp. Examples of the acid to be used for
this surface treatment include phosphoric acid, hydrochloric acid,
pyrophosphoric acid, tartaric acid, citric acid, glutaric acid,
malic acid, and acetic acid and also include acidic substance such
as monobasic phosphates and dibasic phosphates. In addition,
examples of the fluoride to be used for the surface treatment
include aluminum fluoride, zinc fluoride, tin fluoride, zirconium
fluoride, acidic sodium fluoride, and acidic potassium
fluoride.
[0017] Since the glass powder for glass ionomer cement according to
the present invention reacts with a polycarboxylic acid that has
hitherto been used for the glass ionomer cement, in the presence of
water and is cured, it can be used in the glass ionomer cement
composition without particular limitations, like the conventional
glass powder for glass ionomer cement. Accordingly, the glass
powder for glass ionomer cement according to the present invention
can be used together with known polycarboxylic acids or
polyphosphonic acids that are used in the conventional dental glass
ionomer cement compositions, such as polyacrylic acid, polymaleic
acid, and vinyl-phosphonic acid, or copolymers thereof.
[0018] As a matter of course, the glass powder for glass ionomer
cement according to the present invention is applicable to the
conventional glass ionomer cement compositions, in which a power
and a liquid are mixed and cured, and resin-reinforced glass
ionomer cements having a polymerizable monomer and a chemical
polymerization catalyst or a photopolymerization catalyst
compounded therewith. In these cases, there is an effect for
enhancing an adhesive force of the glass ionomer cement cured
material to the tooth structure, too. Incidentally, the glass
powder for glass ionomer cement according to the present invention
may be properly compounded with usually employed pigments, etc., if
desired.
[0019] (Adhesive Strength Test)
[0020] A tooth root portion of bovine mandibular anterior teeth was
cut off, and after extirpation of pulp, an adherent enamel was
exposed using an SiC paper of #600. To the enamel, was stuck a
masking tape bored with a hole having a diameter of 3 mm. A
silicone-made mold having an inner diameter of 5 mm and a height of
1 mm was placed on the bored position, and a paste-like glass
ionomer cement prepared by mixing 1 g of a first paste and 1 g of a
second paste, or a glass ionomer cement prepared by mixing 2 g of a
powder and 1 g of a liquid, was filled therein. In the case where
the glass ionomer cement to be filled is of a light-curing type,
the surface of the test sample was brought into press contact with
a celluloid plate and cured upon irradiation with light for 40
seconds by means of a visible light curing unit (a trade name: GC
New Light VL-II, manufactured by GC Corporation), followed by
placing in a thermostat chamber at a temperature of 37.degree. C.
and at a humidity of 100%. In the case where the glass ionomer
cement to be filled is not of a light-curing type, the surface of
the test sample was brought into press contact with a celluloid
plate and cured, followed by placing in a thermostat chamber at a
temperature of 37.degree. C. and at a humidity of 100%. Twenty-four
hours after placing in the thermostat chamber, the test sample was
subjected to a tensile adhesive force test at a crosshead speed of
1 mm/min. using a universal tester (a trade name: Autograph,
manufactured by Shimadzu Corporation). An average value of eight
test samples and a standard deviation were obtained. The results
obtained are summarized and shown in Table 1.
[0021] (Preparation of Surface-Untreated Glass Powder for Glass
Ionomer Cement)
[0022] Twenty-two grams of aluminum oxide, 43 g of anhydrated
silica, 12 g of calcium fluoride, 15 g of calcium phosphate, and 8
g of strontium carbonate were thoroughly mixed, and the mixture was
molten while keeping in a high-temperature electric furnace at
1,200.degree. C. for 5 hours. Thereafter, the melt was cooled and
pulverized using a ball mill for 10 hours. The resulting product
was made to pass through a 200-mesh (ASTM) sieve. The thus obtained
powder was used as a surface-untreated glass powder for glass
ionomer cement.
[0023] (Silane Treatment Process of Examples 1 to 14)
EXAMPLE 1
[0024] To 100 g of the surface-untreated glass powder for glass
ionomer cement, was added 20 g of an ethyl alcohol solution of 5%
.gamma.-aminopropyl trimethoxysilane. The mixture was thoroughly
mixed in a mortar and subjected to a silane treatment by drying
under the temperature condition as shown in Table 1 using a steam
dryer.
EXAMPLES 2 AND 9
[0025] To 100 g of the surface-untreated glass powder for glass
ionomer cement was added 20 g of an ethyl alcohol solution of 10%
.gamma.-aminopropyl trimethoxysilane. The mixture was thoroughly
mixed in a mortar and subjected to a silane treatment by drying
under the temperature condition as shown in Table 1 using a steam
dryer.
EXAMPLES 3 AND 10
[0026] To 100 g of the surface-untreated glass powder for glass
ionomer cement was added 20 g of an ethyl alcohol solution of 20%
.gamma.-aminopropyl trimethoxysilane. The mixture was thoroughly
mixed in a mortar and subjected to a silane treatment by drying
under the temperature condition as shown in Table 1 using a steam
dryer.
EXAMPLES 4 AND 11
[0027] To 100 g of the surface-untreated glass powder for glass
ionomer cement was added 20 g of an ethyl alcohol solution of 10%
.gamma.-aminopropyl trimethoxysilane and 10% vinyl triethoxysilane.
The mixture was thoroughly mixed in a mortar and subjected to a
silane treatment by drying under the temperature condition as shown
in Table 1 using a steam dryer.
EXAMPLES 5 AND 12
[0028] To 100 g of the surface-untreated glass powder for glass
ionomer cement was added 40 g of an ethyl alcohol solution of 20%
.gamma.-glycidoxypropyl trimethoxysilane. The mixture was
thoroughly mixed in a mortar and subjected to a silane treatment by
drying under the temperature condition as shown in Table 1 using a
steam dryer.
EXAMPLES 6 AND 13
[0029] To 100 g of the surface-untreated glass powder for glass
ionomer cement was added 20 g of an ethyl alcohol solution of 5%
.gamma.-glycidoxypropyl trimethoxysilane and 5%
.gamma.-methacryloxypropy- lmethyl dimethoxysilane. The mixture was
thoroughly mixed in a mortar and subjected to a silane treatment by
drying under the temperature condition as shown in Table 1 using a
steam dryer.
EXAMPLES 7 AND 14
[0030] To 100 g of the surface-untreated glass powder for glass
ionomer cement was added 20 g of an ethyl alcohol solution of 10%
.beta.-(3,4-epoxycyclohexyl)ethyl trimethoxysilane. The mixture was
thoroughly mixed in a mortar and subjected to a silane treatment by
drying under the temperature condition as shown in Table 1 using a
steam dryer.
EXAMPLE 8
[0031] To 100 g of the surface-untreated glass powder for glass
ionomer cement was added 40 g of an ethyl alcohol solution of 20%
.gamma.-mercaptopropyl trimethoxysilane. The mixture was thoroughly
mixed in a mortar and subjected to a silane treatment by drying
under the temperature condition as shown in Table 1 using a steam
dryer.
[0032] (Paste-Based Glass Ionomer Cement Composition A (Examples 1
to 8))
[0033] Ten % by weight of hydroxyethyl methacrylate, 15% by weight
of glycidyl methacrylate, 15% by weight of
2-hydroxy-1-acryloxy-3-methacrylo- xypropane
di-2-methacryloxyethyl-2,2,4-triethylhexamethylene dicarbamate, and
60% by weight of the glass powder for glass ionomer cement
according to the present invention were mixed to prepare a first
paste. On the other hand, 25% by weight of an acrylic polymer
having a weight-average molecular weight of 25,000, 30% by weight
of distilled water, 43% by weight of a silane-treated silica sand
powder prepared by adding 20 g of an ethyl alcohol solution of 10%
vinyl ethoxysilane to 100 g of finely powdered silica sand having a
means particle size of 2 .mu.m, thoroughly stirring the mixture in
a mortar, and then drying at 110.degree. C. for 2-hours, and 2% by
weight of sodium benzenesulfonate, to prepare a second paste. From
the first paste and the second paste, was prepared a paste-based
glass ionomer cement composition A.
[0034] (Paste-Based Glass Ionomer Cement Composition B (Examples 9
to 11))
[0035] A paste-based glass ionomer cement composition B was
prepared in the same manner as in the case of the paste-based glass
ionomer cement composition A, except that the amount of the
2-hydroxy-1-acryloxy-3-metha- cryloxypropane
di-2-methacryloxyethyl-2,2,4-triethylhexamethylene dicarbamate in
the first paste was changed to 14% by weight and that 1% by weight
of camphor quinone was added.
[0036] (Glass Ionomer Cement Composition (Examples 12 to 14))
[0037] A glass ionomer cement composition was prepared, which is
cured upon mixing 3.0 g of the glass powder for glass ionomer
cement according to the present invention with 1.0 g of a
commercially available glass ionomer cement curing liquid (a trade
name: Fuji IILC Liquid, made by GC Corporation).
Comparative Example 1
[0038] A paste-based glass ionomer cement composition was prepared
in the same manner as in the case of the paste-based glass ionomer
cement composition A, except that a commercially available glass
powder for glass ionomer cement (a trade name: Fuji IILC Powder,
made by GC Corporation) was used as the glass powder for glass
ionomer cement.
Comparative Example 2
[0039] A paste-based glass ionomer cement composition was prepared
in the same manner as in the case of the paste-based glass ionomer
cement composition A, except that a surface-untreated glass powder
for glass ionomer cement was used as the glass powder for glass
ionomer cement.
1 TABLE 1 Silane treatment condition Addition Treatment Treatment
Adhesive amount temperature time strength Silane coupling agent
(parts) (.degree. C.) (h) (MPa) Example 1 .gamma.-Aminopropyl
trimethoxysilane 1 110 2 14 .+-. 4 Example 2 .gamma.-Aminopropyl
trimethoxysilane 2 110 2 13 .+-. 3 Eample 3 .gamma.-Aminopropyl
trimethoxysilane 4 110 2 16 .+-. 5 Example 4 .gamma.-Aminopropyl
trimethoxysilane 2 120 2 14 .+-. 2 Vinyl triethoxysilane 2 Example
5 .gamma.-Glycidoxypropyl trimethoxysilane 8 100 2 11 .+-. 4
Example 6 .gamma.-Methacryloxypropylmethyl 1 110 2 14 .+-. 1
dimethoxysilane 1 .gamma.-Glycidoxypropyl trimethoxysilane Example
7 .beta.-(3,4-Epoxycyclohexyl)ethyl 2 120 2 17 .+-. 5
trimethoxysilane Example 8 .gamma.-Mercaptopropyl trimethoxysilane
8 110 2 13 .+-. 6 Example 9 .gamma.-Aminopropyl trimethoxysilane 2
110 2 14 .+-. 3 Example 10 .gamma.-Aminopropyl trimethoxysilane 4
110 2 14 .+-. 2 Example 11 .gamma.-Aminopropyl trimethoxysilane 2
120 2 10 .+-. 1 Vinyl triethoxysilane 2 Example 12
.gamma.-Glycidoxypropyl trimethoxysilane 8 110 2 15 .+-. 3 Example
13 .gamma.-Methacryloxypropylmethyl 1 110 2 15 .+-. 3
dimethoxysilane 1 .gamma.-Glycidoxypropyl trimethoxysilane Example
14 .beta.-(3,4-Epoxycyclohexyl)ethyl 2 120 2 16 .+-. 4
trimethoxysilane Comparative -- -- -- -- 6 .+-. 3 Example 1
Comparative -- -- -- -- 4 .+-. 2 Example 2
[0040] As described above in detail, the glass powder for glass
ionomer cement according to the present invention has a superior
adhesive force to a tooth structure as compared with the glass
ionomer cement using a surface-untreated glass powder for glass
ionomer cement, and hence, the present invention is greatly
valuable in contributing to the dental remedy field.
[0041] While the present invention has been described in detail and
with reference to specific embodiments thereof, it will be apparent
to one skilled in the art that various changes and modifications
can be made therein without departing from the spirit and scope
thereof.
* * * * *