FR2791881A1 - ADAPTABLE MOUTHPIECE ON A SYRINGE FOR DENTAL IMPRESSIONS AS WELL AS A SYRINGE EQUIPPED WITH SUCH A MOUTHPIECE - Google Patents

Abstract

The invention concerns a hub adaptable on a syringe for dental impressions, characterised in that it consists of a curved tubular part (1) essentially tapered in shape, provided with an internal passage (4) whereof the diameter gradually and uniformly decreases towards its free end (5), without any breaks, which may cause pressure losses likely to obstruct the flow of the impression fluid, and whereof the outlet (5) has a diameter (d) less than 0.90 mm, preferably ranging between 0.68 and 0.70 mm so as to enable impressions inside the canal or inside the sulcus.

Description

The present invention relates to an adaptable tip

  ble on a syringe for dental impressions.

  Taking an impression corresponds to an essential step

  of the realization of dental prostheses (crown-

  nes, pivots, bridges ...) and the qualities of these prostheses

  both mechanical and aesthetic depend, to a large extent

  sure, the precision of the imprint.

  However, for an impression to be successful, it is imperative that the fluid, as a rule the elastomer

  imprint, penetrates deep into the gingival groove

  dental. To this end, the first step of taking an impression conventionally corresponds to the placement in force between the tooth to be treated and the gum of a thread called gingival retraction soaked in a hemostatic product, in particular sulfate d aluminum or iron, the main function of which is to spread and dilate the gum in order to facilitate access to the impression fluid in the free zone

  appointed sulcus by specialists.

  After a few minutes, the practitioner removes the gingival retraction wires and immediately injects the impression fluid into the sulcus using a syringe

  which has been previously enlarged.

  The syringes traditionally used for this

  effect have a plunger and a syringe body or holder

  cartridge, preferably transparent, intended to contain the

  impression fluid and at the end of which is fitted a

  injection tip, so that the syringe and its tip

are intimately linked.

  However, these syringes have the drawback of being fitted with a nozzle having an outlet orifice, the diameter of which, at least on the order of a millimeter, is greater than the opening of the sulcus; as a result, the practitioner does not inject the impression fluid into the sulcus but the closest

possible of it.

  This situation poses the problem of the penetration of

  tion of the impression fluid in the sulcus.

  For this purpose, dentists have become accustomed

  to use different devices: compression by the holder

  imprint, finger massage, ...; however, it is

  there are random processes that do not allow systemic success

  matically the first impression, often forcing the practitioner to take it back, which is particularly unpleasant for him and especially for

his patient.

  However, it has not so far been possible to offer syringes with finer tips capable of allowing intrasulular injections: indeed, impression fluids are classically classified according to their fluidity in so-called "light" and in so-called "medium" products; however, these products, which are generally silicone-based elastomers, all, even the "light" ones, have a notable viscosity capable of thwarting their flow in the internal channel of the nozzle, all the more so since the internal channel of the tips currently on the market has discontinuities creating

pressure losses.

  As a result, the thinnest tips, whose outlet has a diameter of the order of a millimeter, already require that the practitioner exerts a strong pressure to push the elastomer, which leads to manual clumsiness

  as well as an irregular and uncontrollable flow and even an im-

  possibility for the weakest of them.

  Another drawback of the tips currently on the market is related to the fact that they do not make it possible to inject the impression fluid into a channel beforehand.

  drilled for the installation of a pivot when the case arises

  smells: in fact, the diameter of the outlet orifice of these tips is also always greater than that of this channel,

  which means that it is not injected but filled with a pivot.

  The object of the present invention is to provide a tip that can be adapted to a syringe for dental impressions.

  likely to remedy these drawbacks.

  This tip is characterized in that it is cons-

  formed by a curved tubular piece of essentially conical shape, provided with an internal channel whose diameter decreases

  gradually and steadily towards its extremi-

  free tee, this without discontinuity such as to create pressure losses liable to impede the flow of the impression fluid, and the outlet orifice of which has a diameter less than 0.90 mm, preferably of the order of 0 .68 to 0.70 mm

  so as to allow the creation of intrasulcu-

laires and / or intraductal.

  The nozzle according to the invention comprises,

  ference, in the immediate vicinity of the outlet, a

  very fine application end, internal diameter and ex-

  constant dull having a length of the order of 10 mm in

  how to make the impression fluid penetrate to the bottom of the sulcus or if necessary a channel previously drilled to

the establishment of a pivot.

  According to the invention, such an injection can be carried out from the bottom of the sulcus or from the canal towards the outside, this

  which has the advantage of removing air bubbles and

  cilitate the cleaning of the cavity in which the impression must be made while also removing impurities

(coagulated blood, ...).

  Given its particular configuration,

  the tip according to the invention therefore allows, thanks to the limitation

  tation of the pressure drops at its internal part, to facilitate the flow of the impression fluid, and therefore to reduce the pushing force to be exerted by the practitioner for a regular and controlled flow so as to allow the injection of that -this, and in parallel thanks to the great fineness of its outlet orifice to reach areas which could not be reached with the tips fitted to traditional syringes. It should be noted that the tip conforms to

  the invention cannot be disposable for economic reasons

  mics; it can be made of any sterilizable material, for example a metal such as nickel which

  has the advantage of being stainless and able to work

to work easily.

  Such all-metal tips have

  However, the disadvantage of being particularly one-

reux.

  Consequently and according to a pre-

  of the invention, the end piece consists, on the one hand, of a front section carrying the outlet orifice and

  the application end which is made of a sterile material

  reusable and stainless, preferably nickel and other

  part, by a rear section preferably equipped with a collar

  flange allowing the attachment of the nozzle to a syringe,

  which is made of sterilizable plastic.

  According to this configuration, the section

  rear is equipped, on its internal periphery, with a shoulder-

  annular dimensioned to allow fixing, in

  especially the gluing of the front section, so that it

  smells like this without creating discontinuities of a nature

  ner the flow of the impression fluid.

  We can thus obtain a "bi-material" tip

  having a continuous and perfectly smooth internal channel.

  According to another characteristic of the invention, the end piece can also advantageously be equipped on its external periphery with a plastic reinforcement ring bonded at the junction zone of the front section and the rear section so as to reinforce the bond

between these two sections.

  The invention also relates to a dental impression syringe comprising a piston and a syringe body or cartridge holder, preferably transparent, intended to contain an impression fluid to be injected into the

a patient's oral cavity.

  Such a syringe is characterized in that it comprises a nozzle having the above-mentioned configuration,

  adapted to the end of the syringe body.

  According to a first variant of the invention, a

  such a syringe is preferably a disposable syringe

  plastic container intended to inject into the sulcus of a pa-

  holds a gingival retraction hydrocolloid also having hemostatic properties, this at a temperature of the order

of 50 C.

  Certain faculties and certain practitioners consi-

  indeed derive that the conventional gingival retraction threads

  only introduced between the teeth and the gum to repel the latter before the impression is made

  itself, are traumatic for the patient and may

  wind even cause posterior retraction of the gum afterwards; they have, therefore, already proposed to replace it with a hydrocolloid called "miracle gel" injected

hot around the tooth to be treated.

  This injection is carried out using a se-

  disposable ring of plastic of the conventional type previously

  fully filled with hydrocolloid and fitted with a nozzle

  traditional with a minimum diameter of around a thousand-

  limeter at its outlet.

  Such a syringe is warmed up in a

  heating belt immediately before use in order to bring the hydrocolloid to the desired temperature at which it is in a softened form sufficiently fluid to

allow injection.

  Given the diameter of the outlet opening of the nozzle, this can however only be carried out around the sulcus, and not at the internal part thereof,

  which means that the hydrocolloid cannot fill correctly-

  its function of replacing the retraction wires

  gingival to dilate and push back the gum before

fluid injection.

  Adaptation on the injection syringe

  the tip according to the invention in place of a traditional tip

  tional overcomes this drawback.

  It has been observed that at a temperature of the order of 50 ° C., the hydrocolloid is sufficiently fluid to be able to be injected through the outlet orifice of this nozzle, the diameter of which is less than 0.90 mm, preferably of the order of 0.68 to 0.70 mm, without the practitioner having to exert excessive pressure to push it for this purpose

towards this orifice.

  According to a second variant of the invention, the se-

  ringue is intended to inject an impression fluid into the

  sulcus of a patient or if necessary in a pre-

  duly drilled for the installation of a pivot.

  As already mentioned, the impression fluids used by dentists to take

  impressions are synthetic elastomers, generally

  rale, based on silicones which have variable viscosities.

  To make intrasulular and / or intraductal impressions, an attempt has been made to mount the nozzle according to the invention at the end of the syringe syringe body.

  conventional single piston with manual actuation.

  However, we realized that it was

  so impossible to inject so-called "medium" products because of their too high viscosity, and that, even in the case of so-called "light" products, the effort to be exerted by the practitioner in order to inject them

  must be very important; it follows that the thrust exerted by

  created on the elastomer must be irregular and weak

  ble compared to its viscosity, which leads to an irregular injection flow sometimes low, sometimes high, impairing good visibility of the practitioner and, consequently, the quality

of the impression made.

  To remedy this drawback, we had the idea,

  in accordance with the invention, to associate with the piston of the syringe-

  gue, a mechanism provided with a lever arm capable of multiplying the forces exerted on it and consequently on the impression fluid. The addition of such a mechanism has the advantage of making it possible to greatly increase the compression of the impression fluid, which, being a

  elastomer based on silicones, therefore of a thixotropic product

  that, leads to its fluidification, thus allowing it to easily exit through the orifice of the nozzle, this, with a flow

sufficient regular and controlled.

  The practitioner can thus always be certain to succeed in his impression, this at the first attempt; the pivot, if it

  exists, is integral with the rest of the imprint.

  It should be noted that the 100% success of the impression is all the better guaranteed, that once placed in the sulcus or the tooth canal, the elastomer based on silicones previously liquefied regains its volume. initial, and relaxes throughout the volume of the sulcus.

  According to a particularly advantageous characteristic

  tagger of the invention, the piston is mounted on a pistol

  effort multiplier known in itself conventionally used

  used to make intraligamentary or intraseptal punctures

  the. The implementation of such a pistol which had

  never been used for personal impression taking

  puts to get particularly faithful fingerprints, and is

  furthermore particularly convenient for the practitioner.

  This gun allows the practitioner to inject the impression fluid gently, with a regular and controlled flow, into the sulcus or a dental canal previously drilled, while retaining all its ability taking into account the low forces required. for

the performance of his act.

  The characteristics of the tip and the tip

  gue which are the subject of the invention will be described in more detail with reference to the accompanying drawings, in which: * Figure 1 is a sectional view of a nozzle,

  * Figure 2 shows a syringe corresponding to the first

first variant of the invention,

  * Figure 3 shows a syringe corresponding to the se-

as a variant of the invention.

  According to Figure 1, the dimensions of the nozzle 1

  have been increased for the sake of clarity.

  In the embodiment shown in the

  Figure 1, this consists of the assembly of a section

  front tubular section 2 in nickel and a rear tubular section

  rière 3 made of sterilizable plastic, glued one

  on the other, so as to define a curved piece of es-

  substantially conical with an internal channel 4, the diameter of which

  meter decreases progressively and steadily

from its outlet 5.

  The impression fluid entering the nozzle through the inlet orifice 6 can thus flow freely according to the

  arrow A in the internal channel 4 without being obstructed by obs-

  tackles or changes of direction likely to create

  load charges. According to Figure 1, the diameter d of the channel 4 at the outlet orifice 5 is of the order of 0.68 to 0.70 mm; this orifice 6 is also immediately adjacent to a very fine application end 7 of length f of the order of 10 mm, the internal and external diameters of which are

  practically constant over its entire length.

  Furthermore, the rear section 3 is equipped, at the level of the inlet orifice 6, with a flange 8 making it possible to fix the nozzle to a syringe for dental impressions, this in a manner which will be described in more detail in the

following this presentation.

  More specifically, and as shown in

  Figure 1, the rear section 3 is equipped, on its periphery

  internal line, of an annular shoulder 9, dimensioned to allow fixing by means of a layer of adhesive 10 of

  the end 11 of the front section 2 opposite the outlet orifice

  tie 5 without creating, in channel 4, discontinuities of na-

  ture to impede the flow of the impression fluid.

  Given this configuration, the section

  front 2 is flush with the rear section 3 through its peripheral periphery

dull at shoulder 9.

  Furthermore, the end piece 1 is also equipped on its outer periphery with a material reinforcement ring

  plastic 12 whose dimensions have been exaggerated on the figure

  gure 1; this reinforcing ring 12 is bonded to the end piece 1 at the junction zone of the front section

  2 and the rear section 3 so as to strengthen the connection between

be these two sections.

  According to Figure 2, the tip 1 is mounted at the end of the syringe body or cartridge holder 14 of a disposable plastic syringe 13 of the traditional type

  fitted with a manually actuated piston 15.

  This piston 15 is equipped at its front end

  a seal 16 for defining a cham-

  injection bre 17 containing a retraction hydrocolloid

  gingival not shown intended to be injected into the sul-

  cus of a patient at a temperature of the order of 50 C in replacement of the gingival retraction threads conventionally introduced between the tooth and the gum before the injection of

the impression elastomer.

  According to Figure 3, the nozzle 1 is mounted at the end of the cylinder body 19 of a syringe 18 adapted

  to the intrasular and / or intercalateral injection of an elas-

  imprint tomera based on silicones.

  As shown, this syringe 18 is fitted with a plunger 20, the end of which is mounted on a pistol

effort multiplier 21.

  This is a device known in itself

  conventionally used by dentists to make injections

  intraligamentary or intraseptal res which, for this reason

  sound, will not be described in detail in the context of this

exposed.

  As shown in Figure 3, the piston 20 is also equipped, at its front part opposite the gun

  force multiplier 21, of a seal 22 deli-

  mitting an injection chamber 23 intended to contain

  the enclosure elastomer based on silicones.

  The syringe body 19 is also equipped at its front part with a threaded end 24 cooperating with a fixing wheel 25 to allow an intimate connection of the syringe 18 and the nozzle 1 via the

flange 8 thereof.

  As already indicated above, the pis-

  Tolet multiplier of efforts 21 allows to exert on the impression elastomer present in the injection chamber 23 sufficient compression to fluidize it taking into account its thixotropy thus allowing to favor its exit by

the outlet orifice 5 of the nozzle.

Claims (4)

CLAIMS) Adaptable tip on a syringe for dental impressions, characterized in that it consists of a curved tubular part (1) of essentially conical shape, provided with an internal channel (4) whose diameter gradually decreases and regularly in the direction of its free end (5), this without discontinuities of a nature to create pressure drops liable to impede the flow of the impression fluid, and the outlet orifice (5) of which has a diameter (d) less than 0.90 mm, preferably of the order of 0.68 to 0.70 mm so as to allow the creation of intrasular and / or intraductal impressions. 2) end piece according to claim 1, characterized in that it comprises, in the immediate vicinity of the outlet orifice (5), a very fine application end (7), of constant internal and external diameters, having a length () of the order of 10 mm so as to allow the impression fluid to penetrate to the bottom of the sulcus or, where appropriate, a channel previously drilled for the installation of a pivot. ) End fitting according to either of claims 1 and 2, characterized in that it is made up: * on the one hand, by a front section (2) carrying the outlet orifice (5) and the end of application (7) which is made of a sterilizable and stainless material, preferably nickel, and * on the other hand, by a rear section (3) preferably equipped with a flange (8) allowing the attachment of the end of a syringe (13, 18), which is made of a sterilizable plastic material, * the rear section (3) being equipped, on its internal periphery, with an annular shoulder (9) dimensioned for per- put the binding, in particular the bonding of the front section (2), so that it is flush with it without creating discontinuities such as to hinder the flow of the impression fluid. 4) end fitting according to claim 3, characterized in that it is fitted on its outer periphery with a plastic reinforcement ring (12). ) Syringe comprises a plunger and a syringe body or cartridge holder, preferably transparent, intended to contain an impression fluid to be injected into the oral cavity of a patient, characterized in that it comprises a nozzle (1) according to any one of claims 1 to 4, adapted to the end of the syringe body (14, 19).   6) Syringe, in particular disposable plastic syringe   that according to claim 5, characterized in that   the impression fluid is a hydrocolloid of retraction gin-   gum intended to be injected into the patient's sulcus at a temperature of the order of 50 C to replace the gingival retraction threads conventionally introduced between the teeth and the gum before the injection of the fluid in particular of the impression elastomer.   7) Syringe according to claim 6, characterized in that the syringe body (14) is previously filled with   the gingival retraction hydrocolloid.   8) Syringe according to claim 5, suitable for injection   intrasular and / or intraductal of a fluid in particular   binding of an impression elastomer, characterized in that the piston (20) is associated with a mechanism provided with an arm   lever capable of multiplying the forces exerted on it and consequently on the impression fluid.   9) Syringe, according to claim 8, characterized in that the piston (20) is mounted on a force multiplier gun (21) known in itself conventionally used for making intraligamentary or intraseptal punctures