FR2693101A1 - Tray and modular cassette tray for operative dental procedure and instrumentation recycling. - Google Patents

Abstract

A modular tray for operative dentistry, including a tray (1) with a receiving surface (10) having a suitable size and shape for receiving a plurality of releasable modular instrument holders (3a, 3b, 3c, 3d...) with a horizontal cross-section or area matching that of one basic square module (M) or a multiple thereof. Furthermore, a lid (2) is combined with said tray (1) to form a cassette tray, and the covering surface (10) of the lid has a suitable size and shape for receiving a plurality of releasable modular holding caps each having a horizontal cross-section or area matching that of one basic square module or a multiple thereof, and thus matching that of the basic square module (M) of the instrument holders (3).

Description

Tray and modular cassette tray for the operative dental procedure and the recycling of instrumentation.

 The present invention relates to a tray and a modular cassette tray for the operative dental procedure and the recycling of instrumentation. More specifically, it is aimed at a set ~ tp Lateau-cassette "standardized comprising a tray and a cover and which allows, on its own, on the one hand, storage and making available to the practitioner the instrumentation necessary for a determined operating procedure and, on the other hand, after the intervention, the recycling of this instrumentation, that is to say its transport, its cleaning in an ultrasonic tank, its sterilization, and finally its storage awaiting a new use.

Traditionally, dentists use, for the various acts that they are called upon to perform, trays of various materials (metallics, different plastics, sterilizable or not) and of variable dimensions (variable standards) in which they have the instruments of the operating procedure, as and when required, without any prior organization. In addition to the embarrassment and loss of time which causes such a situation, this generates still other much more significant drawbacks. Indeed, when the practitioner has completed his operating procedure, the dental assistant clears the tray. She then manipulates soiled instrumentation with risk of injury, the consequences of which are known (contamination by Hepatitis
B, Herpes, AIDS, etc.) Thereafter, she deposits the instrumentation in bulk in a basket which will pass into an ultrasonic tank, then into a sterilizer. At the end of sterilization, the instruments are sorted and stored in the non-sterile drawers of the dental cabinet storage units.

 It is understood that these multiple successive manipulations of bulk instrumentation generate loss of time, alteration or potential loss of instruments and finally, above all, risk of contamination by injury.

 Cassettes are known which solve the problem posed by the various transfers of instruments, as well as that of sterilization.

 We know, for example, cassettes comprising a tray and a cover provided with openings allowing the passage of cleaning liquids and arranged, internally, in a non-transformable manner, to receive a certain number of determined instruments of the operating procedure, some of which only are held in place, when closing said cassettes, by rails made of flexible silicone.

 Unfortunately, in their operating theater version, such cassettes, as well as the various materials currently offered, are not very rational because of an entirely questionable internal organization and a total absence of standardization. Consequently, the instruments are still not stored according to fundamental ergonomic principles. Practitioners still do not have trays or cassette trays suited to the different operating procedures that they have to perform and to a practice that is personal to them.

 The object of the invention is in particular to remedy the various drawbacks mentioned above.

 According to a first characteristic arrangement of the invention, the tray for instruments of the operative dental procedure is remarkable in that it comprises a tray whose receiving surface is dimensioned and arranged in a modular frame, to receive a plurality of door - removable modular instruments, the surface or horizontal section of which corresponds to a square base module or to a multiple of this square base module.

 Thanks to this tray designed according to a modular concept, each practitioner can organize the tray so that it is suitable for their own exercise; this tray thus pre-prepared will always consist of the same instruments arranged in the same order for the same type of act. This ready-to-use tray makes it possible to avoid the loss of time as well as the errors occasioned by the traditional method of the tray formed during a therapeutic procedure.

 From a square base module, it is possible to equip the tray with removable instrument holders whose horizontal section corresponds to this module and / or with larger instrument holders whose horizontal sections correspond to multiples of this basic module, these horizontal sections can have very varied dimensions and shapes, square, rectangular, L, U, etc. In this way, the filling of all or part of the receiving surface of the tray can be carried out with a very wide variety of combinations.

According to another characteristic arrangement of the invention, a cover is associated with the tray intended for the reception of the instruments, with which it constitutes a cassette tray, and the cover surface of this cover is dimensioned and arranged according to a modular frame, for receive a plurality of removable modular retaining caps whose surface or horizontal section corresponds to a square base module or to a multiple of this square base module which corresponds to the surface or horizontal section of the square base module of the instrument holders. Advantageously, the cover comprises a plurality of removable modular retaining caps, the horizontal surfaces or sections of which correspond to the horizontal surfaces or sections of the removable modular instrument holders associated therewith.
This system allows the practitioner to easily open the cassette tray "and to have, on the one hand, a complete instrumental tray adapted to the act he will have to perform and also, on the other hand, a very useful serving tray (for example: removable patient prosthesis, caps or bridges before sealing, instruments no longer to be used, waste), which doubles the usable base surface At the end of the intervention, the assembly is closed to allow complete blocking of all the instruments (small or large) contained inside and, thereafter, the various cleaning and sterilization operations can follow one another easily.

It is understood that the standardized and modular cassette tray according to the invention allows ergonomic work for the dental surgeon, in its "pre-prepared" operating tray version, then ultrasonic cleaning and sterilization of the instruments without any risk of injury and / or contamination for the dental assistant
According to another characteristic arrangement of the invention, the actual tray or tray for receiving the instrument holders and the cover intended for fixing the retaining caps, are constituted by strictly identical trays capable of being closed. One on
The other and whose assembly in the closed position can be obtained by various means and, for example, by quick locking plugs engaged in the corners of said trays shaped and arranged for this purpose.

 Independently of its interest from the point of view of asepsis and ergonomics, The system according to the invention has a non-negligible economic interest; indeed, the presentation in identical double trays, allows a use in "simple tray for the practitioner who wishes to start the system by a reduced investment.

 It can then evolve towards the integral system "p Lateau-cassette". as and when required, by assembling and locking trays between them.

 We understand that this system allows you to start and evolve freely, which excludes the concept of "all or nothing".

The overall format of the cassette tray can be advantageously standardized. This format can be, for example,
The A4 format (21 x 29.7 cm), so that it can be integrated into the already standardized storage systems ("Office Storage11" standards). In addition, this format allows optimization of the ergonomic characteristics compatible with the size of the ultrasonic tanks. and sterilization chambers currently available on the market.

The adoption of a standardized format makes it possible to provide for the storage of stacks of "Cassette Trays" thus constituted in trolleys or storage furniture which will be standardized in A4 format which corresponds to the standard "Office Storage
The device of the invention therefore makes it possible to develop a standardization chain which starts in the dental chair, continues in the sterilization room to end in the storage area, which is fully in line with the concept of ergonomic working of the dentist.

 The tray-cassette assembly according to the invention constitutes the keystone of an ergonomic concept which interests both the rationalization of the clinical acts of the dental surgeon and the sterilization of small instrumentation. The concepts of modularity and standardization ensure complete therapeutic and economic freedom for each practitioner.

 It is emphasized that if a particularly interesting application of the invention is described in the present description for the presentation and recycling of the instrumentation of the operative dental procedure, this destination is not limiting, the invention being able to indeed be implemented advantageously in other medical procedures (surgery, ophthalmology, ENT, etc.) or in certain industries which, for example, have the obligation to clean small parts by ultrasound or otherwise, without these parts do not deteriorate with each other, such as electronics, mechanics, jewelry, etc.

The foregoing objects, features and advantages, and others, will become more apparent from the following description and the accompanying drawings in which
Figure 1 is a perspective view of an exemplary embodiment of the cassette tray according to the invention.

 Figure 2 is a schematic view, in plan and partially broken away, illustrating an example of occupation of the receiving surface of the tray; the fine dotted line shows the modular grid defining the basic modules and the arrangement of said receiving surface. This figure illustrates an example of theoretical occupation of the tray, the aim of which is to explain the modular design of the device according to the invention.

 FIGS. 2A, 2B, 2C and 2D are plan views and on a reduced scale, illustrating examples of occupation of the tray corresponding to different more concrete cases of arrangement of the latter.

 FIG. 2A represents an example of arrangement making it possible to receive a large number of long instruments, while FIG. 2D illustrates an example of occupation of the tray allowing the positioning of a small number of such instruments.

 FIGS. 2B and 2C illustrate two examples of intermediate arrangements.

 Figure 3 is a partial plan view of the actual tray without instrument holder.

 FIG. 4 is a cross-sectional view along the line IV-IV of FIG. 3.

 Figure 5 is a partial top view of the tray shown in Figure 3, with partial cutaway, showing the mounting pads which are respectively provided with the upper surface of the tray and the lower surface of the instrument holders.

 FIG. 6 is a cross-sectional view along line VI-VI of FIG. 5.

 Figure 7 is a partial perspective view illustrating the mode of cooperation of the main components of the device according to the invention.

 FIG. 8 is a partial plan view illustrating the positioning of a cutter holder module on a receiver plate.

 Figure 9 is a sectional view along line IX-IX of Figure 8.

 Figure 10 is a partial plan view of a receiving plate, illustrating the positioning of an instrument holder module on which is positioned a long instrument.

Figure It is a sectional view along the line
XI-XI of figure 10.

 FIG. 12 is a partial plan view showing the positioning of a modular retaining cap on the lower surface of the cover of the cassette tray shown in FIG. 14, this retaining cap being intended to cooperate with a carrier module. strawberry.

 FIG. 13 is a view similar to FIG. 8 showing the positioning of a cutter holder module on the receiving plate of this cassette plate.

 Figure 14 is a cross-sectional view of the cassette tray formed by the combination of the cover and the receiver tray illustrated in Figures 12 and 13; the upper half-part of this figure is a transverse section along line XIV-XIV of FIG. 12, while its lower half-part is a transverse section along line XIV'-XIV 'of FIG. 13.

Figure 15 is a partial plan view illustrating
The positioning of a modular retaining cap on the lower surface of the cassette tray shown in FIG. 17, this retaining cap being intended to cooperate with a long instrument holder module.

FIG. 16 is a partial plan view of a receiver plate provided with an instrument holder module on which a long instrument is placed
Figure 17 is a cross-sectional view of the cassette tray formed by the combination of the cover and the receiver tray illustrated in Figures 15 and 16; The upper half-part of this figure is a transverse section along the line XVII-XVII of figure 15, while its lower half-part is a transverse section along the line XVII'-XVII 'of figure 16.

 Figure 18 is a front view of an instrument holder module and an additional modular retaining cap for positioning and locking a long instrument.

 FIG. 19 is a side view of FIG. 18.

 FIG. 20 is a view of the external face of the two half-parts of a long instrument holder or of two long instrument holding caps, each consisting of a half-module.

 Figure 21 is a plan view of Figure 20, illustrating the two half-parts of a long instrument holder module.

 FIG. 22 is a plan view of FIG. 20, showing two caps for holding long instruments.

 FIG. 23 is a view in vertical section and on a larger scale of a "bucket" module and of its associated retaining cap.

 FIG. 24 is a view in vertical section and on a larger scale of a strawberry support module and of its complementary retaining cap.

 FIG. 25 is a view in vertical section and on a larger scale of a module for supporting canal instruments and its associated retaining cap.

 Figure 26 is a cross-sectional view illustrating different instrument holder modules and their associated retaining caps positioned on the receiving tray and under the cover, respectively, of a cassette tray.

 Figure 27 is a plan view and on a larger scale, of the angle of a tray.

 FIG. 28 is a sectional view along line a-b-c-d of FIG. 27.

 Figure 29 is a perspective view of an interlocking piece for ensuring the stability of a stack of trays.

 Figure 30 is a detail view, in vertical section, showing the use of this interlocking part.

 Figure 31 is a longitudinal sectional view of a locking plug usable for ensuring the assembly of the receiving tray and the cover of a cassette tray.

 Figure 32 is a top view of Figure 31.

 Reference is made to said drawings to describe an interesting, although in no way limiting, embodiment of the tray and the cassette tray according to the invention.

 This cassette tray mainly comprises - two trays, preferably identical, 7, 8; - A plurality of instrument supports 3 shaped to be able to be installed, in a removable manner, on the reception area of one of the trays, so as to constitute a receiver tray 1; - A plurality of retaining caps 4 arranged to be fixed, removably, under the second plate, so as to constitute a cover plate 2; - connecting members 5 making it possible to assemble, preferably in a separable manner, the receiver plate 1 and the cover plate 2.

 In addition, preferably, the device according to the invention also comprises interlocking parts 6 making it possible to stabilize stacked receiver plates.

The above components of the cassette tray according to the invention are preferably made of a heat-resistant plastic material in particular because of - the ease of molding of the stud systems described in the following of this description and allowing the detachable fixing of the instrument holder modules and of the holding cap modules, on their respective support plates; - the flexibility of friction of these studs between them; - Lightness - low noise resulting from handling, impact or falling; - the speed of cooling after sterilization; - the possibility of coloring in the mass to give
The possibility of coding by the color of the plates.

 The receiver tray 1 and the cover tray 2 each comprise a tray respectively 7 and 8, which, according to a characteristic arrangement of the invention, are strictly identical.

 These trays preferably have standardized dimensions, for example a length of 29.7 cm and a width of 21 cm corresponding to the standardized A4 format.

 The plates 7 and 8 have a flat appearance and have a projecting peripheral border 9 rising towards the interior and a central useful surface 10 delimited by this border. The border 9 ensures the rigidity of the plate while the useful surface 10 is intended, as the case may be, for the removable fixing of the instrument holders 3 or of the retaining caps 4.

 Although hollow, to ensure permeability to liquids and also to reduce the weight of the plate 7, 8, the peripheral edge 9 considerably stiffens, by hull effect, the whole of said plate.

Furthermore, and as will be seen in the remainder of this presentation, the border 9 constitutes a space which can be used for multiple functions such as - self-blocking stacking of stackable receiver trays 1; - locking of the receiving trays 1 and cover 2 in the assembly position; - Production of a self-supporting tray positioned without support thanks to a fixing core locked at the user's choice over the entire periphery of the rigid border;
The ergonomic advantage of this concept is the liberation of all the space occupied after removal of the cervical operating platform.

 According to the invention, the useful surface 10 of the plates 7 and 8 is dimensioned to correspond to a frame T consisting of a plurality of meshes or square modules M (FIG. 2).

 Interestingly, the useful surface 10 has a length of 27 cm, a width of 18 cm, and it is divided into meshes or square modules M of 3 x 3 cm, said surface thus being made up of 54 meshes or square modules.

 The useful surface 10 of the plates 7 and 8 is provided with circular orifices 11 arranged in parallel alignments and having, for example, a diameter of 11 mm, the center of these orifices being 15 mm. The edge 9 of the plates is also provided with lateral orifices 12, preferably circular, opening inside.

 These orifices 11 and 12 allow the circulation of cleaning and sterilization fluids, draining and drying (for example in a ventilated tank).

 The internal face of the useful surface 10 of the plates 7 and 8 and the rear faces of the instrument holders 3 and / or of the retaining caps 4 are provided with complementary means to allow the removable fixing of said instrument holders 3 and / or of said caps holding 4 on said useful surface.

 According to the very advantageous embodiment illustrated in the drawings, the internal face of the useful surface 10 of the plates 7 and 8 has a plurality of studs or pins 13 constituted by small cylinders aligned in two perpendicular directions. Interestingly, these studs 13 are hollow and arranged coaxially with the orifices II; they rise inward from the edge of said orifices. These cylindrical studs have for example a height of 5 mm, a center distance of 15 mm, an internal diameter of 11 mm, an external diameter of 13 mm and, consequently, a thickness of 1 mm.

 Each plate 7 or 8 has for example a total height of 25 mm and it has a useful height of 20 mm, delimited by the free end of its studs 13 and the height of its border 9.

 In this way, the height of the cassette tray in the closed position will be 5 cm, thus leaving a useful height of 4 cm between the two plates 7 and 8, which is sufficient to receive the vertical storage of any of the dental instruments. and, in particular, canary instruments.

 The receiving tray 1 according to the invention comprises a plurality of removable and interchangeable instrument holders 3, the dimensions and conformation of which depend on the nature of the instruments which they are to receive, a particularity of these instrument holders being that '' they are modular, that is to say that some of them are dimensioned to correspond to a square basic module M and that the others are dimensioned and shaped to correspond to multiples or submultiples of this basic module.

 According to the example chosen, the basic module occupies an area of 3 cm x 3 cm, or 9 cm2, so that the surface of certain instrument holders corresponds to this module, while the surface of the other instrument holders corresponds to a multiple of the basic module. Thus, in Figure 2, we see that the receiver plate 1 supports - four instrument holders 3a corresponding to the basic module; - two instrument holders 3b corresponding to two basic modules; - two instrument holders 3c corresponding to three basic modules; - two 3d instrument holders corresponding to four basic modules; - a 3rd instrument holder corresponding to five basic modules; - three instrument holders 3f corresponding to six basic modules; - a 3g instrument holder corresponding to nine basic modules.

 The base surface (3 cm x 3 cm) is ergonomic, because it allows the positioning of the instruments with a center distance of 15 mm, which allows a good grip of small instruments (files, strawberries, stuffers, ...) between the thumb and forefinger, without using a tweezer.

 Instrument holders with more than two M modules can have various shapes as shown in Figure 2, including shapes including directional changes (L, U shapes, etc.).

 Figures 23, 24, 25, 18 and 19 show examples of configuration of instrument holder modules. According to Figure 23, the modular instrument holder 3 is made in the form of a bucket, according to Figure 24 this instrument holder is shaped. to constitute a support for strawberries F or analog instruments, while according to FIG. 25, it is constituted by a support for canal instruments C.

According to FIGS. 18 and 19, the instrument holders 3 are produced in the form of multiple cradles intended to support one or more long instruments L. In this case, the instrument holder can consist of two half-parts having a generally elongated shape and each having a surface corresponding to one or more halves of the surface of a module. FIGS. 20 and 21 show, respectively in bottom view and in top view, the two half-parts of a modular support d long instruments, each having a surface corresponding to half the surface of a basic module;
These two half-parts have been brought together to show that they belong to the modular system of the invention, but are arranged at a distance from one another. When in use, as seen in particular in FIGS. 16 to 18 .

 The external face of the bottom of the instrument holders 3 is provided with small studs or hollow studs 14 preferably constituted by small cylinders extending in the direction of the exterior from said face. These studs 14 have an external diameter, a center distance and a height which are a function of the external diameter, the center distance and the height of the studs 13 of the plate itself 7 of the receiving plate 1. Given the above indications given by way of example, during the description of the pads 13, the pads 14 of the modular instrument holders can advantageously have. a height of 5 mm, a center distance of 15 mm, an external diameter of 8 mm and an internal diameter of 6 mm.

 In other words, the studs 14 and the studs 19 mentioned below have a diameter allowing their friction engagement in the inter-stud spaces 15 of the useful surface 10 of the plates 7, 8, so as to achieve the removable fixing of the doors -instruments 3 and holding caps 4.

 Each instrument holder 3a, 3b, 3c, 3d,. - -, may include four blocks 14 per modular space occupied by this or a single block arranged in the vicinity of each of their angles, depending on their size.

 The instrument holders 3a, 3b, 3c, 3d, ..., thus produced can be fixed, in a removable manner, on the useful surface of the plate 7, by plugging their studs 14 into the inter-stud spaces 15 of said surface. useful. For example, there is shown by a fictitious circle, the inter-stud spaces 15 in which can engage, by friction, the studs 14 of the instrument holder module 3, in FIG. 7.

 The side walls of the instrument holders 3 are provided with holes 16 opening out inside said instrument holders and which, when the latter are positioned on the useful surface 10 of the plate 7, are placed in correspondence and alignment with the orifices 12 external side walls of the edge 9 of said plate, these holes ensuring perfect permeability to ultrasound and sterilization fluids, while playing a role of sieve when the type of content of the module requires it.

 For the same purpose, holes 17 opening into the cylindrical studs 14 are formed in the bottom 18 of the instrument holders.

 FIGS. 2A, 2B, 2C, 2D have shown different examples of occupation of the receiving plate 1. It can be seen that the practitioner can choose to place his long instruments parallel to the small side of the plate (FIGS. 2A, 2B, 2D), or parallel to the long side of said plate (FIG. 2C), which remains oriented so as to be facing the operator in the direction of its length. This possibility of changing the orientation of the axes of long instruments modifies manual entry and leaves the operator free choice of grip.

 The cover plate 2 comprises a plurality of retaining caps 4 or blocking counterparts which, according to the invention, are dimensioned and shaped according to the dimensions, conformation and destination of the instrument holders 3a, 3b, 3c, 3d, that they are called upon to cover.

 The modular retaining cap 4 shown in FIG. 16 is produced in the form of a cup identical to the instrument holder 3 which it covers.

 FIG. 17 illustrates two possible arrangements of the retaining caps intended for blocking the cutters.

Next The left part of the figure, The retaining cap comprises a flexible lining 20 (plastic foam) ensuring tolerance for slight differences in height of the instruments positioned on the instrument holder. According to the left part of the figure, the retaining cap comprises a rigid conical centering stop 21.

 The retaining cap shown in Figure 18 is constituted by a simple plate.

 The retaining cap 4 illustrated in FIGS. 18, 19 and 22 is constituted by a bar provided with support hares 25 divided into strips and provided with an elastic deformation capacity. In this case also, the retaining caps have an elongated shape and occupy a surface corresponding to one or more halves of the base module.

 These various modular retaining caps 4 are provided with studs 19 oriented towards the outside and identical to the studs 14 of the instrument holders 3, as regards their height, their diameter and their distribution.

 It is understood that the modular retaining caps 4a, 4b, 4c, ..., thus produced can be fixed, in a removable manner, on the useful surface of the plate 8, by friction engagement of their studs 19 in the interplot spaces 15 of said useful surface.

 The cover walls or bottom 26 of the retaining caps 4 are provided with holes 22 opening into the cylindrical studs 19.

 The plates 7 and 8 are shaped and arranged to allow - their assembly in the closed position and their separation in the open position, quickly and easily; - or their superposition, so as to constitute a stable stack.

 Figures 27 to 32 illustrate a very interesting arrangement of the angles of the plates to allow their assembly or stacking.

 Each angle of the peripheral edge 9 of the plates 7, 8 is thinned. This thinned corner portion 23 is arranged opposite the useful surface 10 of the plate 7, 8, and its internal surface 23a is located in the plane of the internal surface 9a of the border. In other words, each thinned corner portion 23 is disposed in the plane of the free edge of the edge 9. In this way, when the receiving tray 1 and the cover tray 2 are closed one on the other, their thinned corners 23 are pressed against each other (Figure 31).

 The thinned corners 23 are provided with at least one hole teL, for example a circular central hole 24.

 The corner holes 24 allow - either the engagement of a quick locking plug 5 (Figures 31 and 32); - Or the engagement of the post 6a of an interlocking piece 6 (Figures 29 and 30).

 The quick locking plugs 5 allow the two trays 1 and 2 constituting a cassette tray according to the invention to be easily and quickly assembled. These quick locking plugs comprise, for example, a central body Sa and two flexible lateral branches 5b slightly spaced from said central body and provided, laterally, with a lug 5c disposed in their intermediate part. A helical spring 5d is arranged around the rear part of the body Sa, this spring bearing, by means of one of its ends, against a circular shoulder Se which the said rear part has. This spring also allows for tolerance. as to the thickness of the instruments housed in the cassette tray When the latter occupy a volume slightly larger than the space reserved for them inside said cassette tray.

 This spring could be replaced by any equivalent elastic system or device.

 The front portions of the flexible branches 5b comprise, laterally, a slope 5f having the effect of automatically bringing said branches together when the plug 5 is engaged and pushed into the holes 24 aligned with two thinned angles 23 of two plates (7, 8) closed l 'one on the other, the branches then deviating as soon as the pins 5c have crossed the passage formed by the two successive holes. On the other hand, the flexible branches 5b also have, from and above the locking lugs 5c, a slope 5g facilitating the retraction of the locking plug, under the action of the spring 5d, after having pinched said flexible branches, When we want to separate the trays 1 and 2.

 The plates 7 and 8 could be otherwise shaped or arranged to allow them to be assembled and separated easily and quickly, while retaining the basic principle of two strictly identical plates. For example, they could be provided with asymmetrical hinges or ball systems molded in one piece with said plates or attached to them after molding.

 The interlocking pieces 6 or removable corner counterparts have the shape of the depression resulting from the prediction of the thinned angles 23 of the plates 7, 8.

 This fitting piece comprises, at its top, a tenon 6a whose diameter is barely less than the diameter of the holes 24 and whose height is slightly greater than the thickness of the thinned angles 23 of the plates 7, 8.

On the other hand, the bottom of the fitting parts 6 includes a cavity 6b sized to receive
The free end of the post 6a of an identical underlying fitting piece.

 These interlocking pieces 6 allow centering and nesting of a plurality of receiving trays 1 stacked on top of each other, thereby ensuring the stability of the stack.

 In addition, this fitting piece can be made with different colors, so as to allow coding for rapid identification, by color, of the contents of the trays.

Claims (17)

1. - Modular tray for the operative dental procedure, characterized in that it comprises a tray (7), the receiving surface (10) of which is dimensioned and arranged to receive a plurality of removable modular instrument holders (3a, 3b, 3c, 3d, ...) whose surface or horizontal section corresponds to a square basic module (M) or to a multiple of this module. 2. - Modular tray for the operative dental procedure, according to claim 1, characterized in that it comprises a plurality of removable instrument holders (3a, 3b, 3c, 3d, ...) whose surface or horizontal section corresponds to a square basic module (M) or to a multiple of this module. 3. - Modular tray for the operative dental procedure, according to one of claims 1 or 2, characterized in that a cover (2) is associated with said tray (1) with which it constitutes a cassette tray, and in that that the cover surface (10) of this cover is dimensioned and arranged to receive a plurality of removable modular retaining caps (4) whose surface or horizontal section corresponds to a square base module or to a multiple of this base module square which corresponds to the surface or horizontal section of the square basic module (M) of the instrument holders (3). 4. - Modular tray for the operative dental procedure, according to claim 3, characterized in that it comprises a plurality of removable modular retaining caps (4) whose surface or horizontal section corresponds to a square base module or to a multiple of this square base module which corresponds to the surface or horizontal section of the square base module (M) of the instrument holders (3). 5. - modular cassette tray according to claim 3, characterized in that the actual tray or tray for receiving the instrument holders (3) and the cover for the removable fixing of the retaining caps (4), are constituted by rigorously identical plates (7, 8). 6. - Modular tray according to one of claims 3 or 5, characterized in that the plates (7, 8) are shaped and arranged so as to allow their rapid assembly in the closed position.  7. - modular tray according to any one of claims I, 3, 5 or 6, characterized in that the plates (7, 8) are shaped and arranged so as to allow their stable stacking. 8. - Modular tray according to any one of claims I to 7, characterized in that the internal face of the useful surface (10) of the actual tray (7, 8) and the rear faces of the instrument holders (3) and / or retaining caps (4) are provided with complementary means (13, 14, 19) to allow the removable fixing of said instrument holders (3) and / or said retaining caps (4) on said useful surface (10 ). 9. - Modular plate according to claim 8, characterized in that the internal face of the useful surface (10) of the plate itself (7, 8) is provided with a plurality of cylindrical pads (13) rising towards The interior, from said surface, and in that the rear faces of the instrument holders (3) and / or the rear faces of the retaining caps (4) are provided with cylindrical studs (14, 19) having a diameter allowing their friction engagement in the inter-stud spaces (15) of said useful surface. 10. - Modular tray according to claim 9, characterized in that the cylindrical studs (13) of the plates (7, 8) are hollow and arranged coaxially to circular orifices (11) that has the useful surface (10) of said plates. 11. - Modular tray according to one of claims 9 or 10, characterized in that the cylindrical studs (14, 19) of the instrument holders (3) and / or retaining caps (4), are hollow, and in that holes (17) opening into said cylindrical studs (14, 19) are formed in the bottom (18, 36) of said instrument holders (3) and / or said retaining caps (4). Lateral (12), preferably circular, opening inside.  12 - Modular tray according to any one of claims I to 11, the tray itself comprises a projecting peripheral border (9) and a central useful surface (10) delimited by this border, characterized in that said border is provided with '' orifices 13. - Modular tray according to any one of claims 1 to 12, characterized in that the side walls of the instrument holders (3) are provided with holes (16) opening into the interior of said instrument holders. 14. - Modular tray according to one of claims 6 or 7, the tray itself comprises a projecting peripheral border (9) and a central useful surface (10) delimited by this border, characterized in that said peripheral border (9 ) of the actual tray (7, 8) has thinned corners, the thinned corner portions (23) being arranged in the plane of the free edge (9a) of said edge and comprising at least one hole (24). 15. - Modular cassette tray according to claims 6 and 14, characterized in that it comprises locking plugs (5) comprising a central body (5a) and two flexible lateral branches (5b) slightly spaced from said central body and provided , laterally, of a lug (5c) disposed in their intermediate part, the anterior portions of said flexible branches (5b) laterally having a slope (5f) ensuring their automatic approach when said locking pins (5) are engaged and pushed into the aligned holes (24) of two tapered angles (23) of two plates (7, 8) closed against each other in the closed position. 16. - Modular cassette tray according to claim 15, characterized in that the locking pins (5) comprise a helical spring (5d) disposed around the rear portion of their central body and bearing against a shoulder (5e) that has said rear portion, and in that the flexible arms (5b) have, from and above their locking lug (5c), a slope (5g) facilitating the retraction of said locking plugs under the action of said spring (5d).  17. - Modular tray according to claims 7 and 14, characterized in that it comprises dimpling parts (6) or removable corner counterparts comprising, on the one hand, at their top, a tenon (6a) of which The diameter is hardly less than the diameter of the corner holes (24) and the height of which is slightly greater than the thickness of the thinned angles (23) of the plates (7, 8) and, on the other hand, in its bottom, a cavity (6b) dimensioned to receive the upper portion of the post (6a) of a part dt identical underlying socket.