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Патент USA US3082541

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March 26, 1963
Filed Oct. 23, 1961
Roé en‘ 27. Jacoésazz
United States Patent 0 "ice
Robert J. Jacobson, 1039A Elm St., Fayetteville, N.C.
Filed Oct. 23, 1961, Scr. No. 146,805
1 Claim. (‘CL 32-63)
Patented Mar. 26, .1963
which material is workable at room temperature is para?in
wax, beeswax, or spermaceti. These waxes display ad
hesive properties, and when applied to the strip 11 in the
form of a pad 12, will adhere thereto. Likewise, the pads
12 will adhere to the teeth to which they are applied
under pressure. A pad 12 is therefore pressed onto the
My invention relates to dental matrix strips generally,
strip 11 at opposite ends of the same side of the strip
and speci?cally to a dental matrix strip including a means
11, but near the ends thereof. The middle portion 13
for securing it in place.
of the strip 11 is then wrapped around a tooth 14 so that
It is an object of my invention to provide a dental 10 the mid-portion 13 covers a cavity 15 into which a ?lling
matrix strip for retaining porcelain ?lling material and
16 has been packed. The cooperative wax pads 12 are
the like in a cavity in a tooth into which it is packed.
‘disposed on the side of the strip 11 adjacent to a second
it is another object of my invention to provide a
tooth 17. Upon application of pressure to the strip 11
dental matrix strip which is easy to handle, use, apply,
at the point of the pads 12, the pads are molded to con
and ?x in place.
form to the external surface of the tooth 17 as shown in
It is yet another object of my invention to provide a
FIGURE 3 and adhere thereto. The pads 12 may be
dental matrix strip which conforms to the con?guration
rendered more adhesive with respect to a tooth by mix
of the tooth and con?nes the ?lling packed into the
ing the wax with gum damar or any of the similar resinous
exudates or synthetic resins which display adhesive prop
Yet another object of my invention is to provide a
erties. Gum tragacanth will also enhance the adhesive
dental matrix strip which incorporates selfeadhering
properties of the Wax. In addition, a quantity of gum
properties by which it secures itself to teeth adjacent to
karaya may be sprinkled on the surface of the pads 12,
the tooth being ?lled.
12 or kneaded into the wax. Either of these materials
Yet another object of my invention is to provide a
may also be added in powder form to the melted wax,
dental matrix strip which requires no external aid, either
and then allowing it to harden. A desiccant is useful to
mechanical or manual to maintain it in position during
encourage adhesion of the wax to moist tooth surfaces.
the period in which the ?lling material is to set. These
Gum karaya has been found to display moisture absorbent
objects and advantages as well as other objects and ad
properties so that the moist surface of the tooth (which
vantages may be attained by the device shown in the
might have a tendency to resist adherence of the pads 12,
drawings in which:
12) will be dried and the pads 12, 12 will adhere thereto
FIGURE 1 is a view in perspective of the inside of a
without any dif?culty. By exerting manual pressure upon
dental matrix strip.
the strip 11 it may be brought into tight engagement with
FIGURE 2 is a top plan view thereof.
FIGURE 3 is a top plan view thereof showing the strip
the surface of the tooth 14 adjacent the cavity 15 so
the ?lling material 16 is tightly contained until it
applied to teeth; and
sets. There is no necessity for mechanical appliances to
FIGURE 4 is a view in perspective showing the dental
retain the strip in operative position, and a minimum of
matrix strip in operative position, retaining a ?lling packed
discomfort is thereby imposed upon the dental patient.
in a cavity, with the strip secured to an adjacent tooth.
The dental matrix strip is intended primarily for use
Referring now to the drawings in detail, my dental 40
on interproximal restorations of anterior teeth i.e. upper
matrix strip consists of a band or strip 11, generally rec
and lower centrals, laterals, and cuspids; the teeth shown
tangular in shape. It may be approximately two inches
in the ?gures are merely intended as illustrative. The
long and three-eighths of an inch wide. The strip may be
dental matrix strip is intended for use with a wide variety
formed of a transparent ?lm such as cellophane, although
of ?llings, for example, plastic or silicate ?llings and its
there are numerous other relatively unresilient, water re
sistant, vilexible materials which will serve just as well.
It is preferred that the strip or band 11 should be trans
use is not intended to be limited to those mentioned. The
thickness of the strip should :be of such an order that it
parent in order that the e?icacy of its performance and
positioning may be determined by visual examination.
Thus, when the porcelain ?lling material is packed into
the cavity, the strip should be applied so as to engage
may be readily inserted between adjacent teeth in the
mouth and will yet have the requisite strength to perform
its function of containing a ?lling. Cellophane and
similar transparent strip materials have slick surfaces,
the ?lling material ‘from discharge from the cavity, and
which are incompatible with the ?lling materials com
the determination of its e?icient functioning in this man
ner can best be arrived at by visual examination through
a transparent strip 11.
The means by which the dental matrix strip 11 is held
monly used in dentistry. Thus, the problem of adherence
in place is a pair of pads 12 having adhesive qualities.
These pads 12 may be approximately one-half inch square
parts have been shown and described. They each may
have substitutes which may perform a substantially similar
and one thirty-second to one-sixteenth of an inch thick.
function; such substitutes may be known as proper sub
stitutes for the said components and may have actually
been known or invented before the present invention;
these substitutes are contemplated as being within the
The pads are self-sustaining at ordinary temperatures, yet
soft and flexible and capable of being molded upon the
application of pressure to conform to the surface con
?guration of a tooth to which they are applied with pres
sure. Material suitable for such rectangular pads 12
of the strip to the ?lling is not acute.
The foregoing description is merely intended to illus
trate an embodiment of the invention.
The component
scope of the appended claim, although they are speci?cally
catalogued herein.
What is claimed:
A dental matrix strip comprising
(a) a generally rectangular, ?exible, relatively thin,
non-resilient, moisture resistant transparent band
of material non-adhesive to dental ?lling material; 5
(e) the band longitudinally dimensioned to wrap
around a tooth with the pads disposed on opposite
sides of an adjacent tooth,
References Cited in the ?le of this patent
(b) a pair of generally rectangular, soft, ?exible, self
sustaining, moldable pads of material adherent to
teeth, the pads adhered to one side of the band;
(c) an adhesive incorporated with the material of the
Miner ——————————————— -- M3)’ 23, 1922
BHIIBW ______________ __ Aug. 18, 1925
(d) a desiccant incorporated with the material of the
Dvorak ______________ __ Apr. 9, 1940
Christie _____________ __ July 28, 1953
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