AU2020101357A4

AU2020101357A4 - Dental separator

Info

Publication number: AU2020101357A4
Application number: AU2020101357A
Authority: AU
Inventors: Carolina Montes
Original assignee: Montes Carolina Dr
Current assignee: Montes Carolina Dr
Priority date: 2020-07-14
Filing date: 2020-07-14
Publication date: 2020-08-20
Anticipated expiration: 2028-07-14

Abstract

OF THE DISCLOSURE A dental separator, which has a bar assembly having first and second bars, a supporting structure, a holder assembly having first 5 and second holders, and a matrix strip. The matrix strip is made of the Polytetrafluoroethylene. The supporting structure has a bottom base, and first and second lateral walls. The first lateral wall has a supporting base having an upper face and a lower face. The first and second bars perpendicularly extend from the upper face o separated a predetermined distance each other. The second lateral wall defines first and second protrusions, which have first and second holes respectively. The first and second holes secure a string. The first and second holder mounts onto the first and second bars respectively to secure the matrix strip. The matrix strip 5 remains extended and stretched between the first and second bars. The matrix strip and the string are each inserted between sets of adjacent teeth. 5 25 80 64 58 7 10 o 76- 56 78 50 54F52 Fig. 7

Description

80 64

58 7 o 76- 56 78 50

54F52

Fig. 7

I. TITLE: DENTAL SEPARATOR II. BACKGROUND OF THE INVENTION

1. Field of the Invention.

The present invention relates to dental instruments, and more particularly, to a dental separator.

2. Description of the Related Art.

Applicant believes that one of the closest references corresponds to U.S. Patent No. 5,975,906 A issued to Eric J. Knutson on November 2, 1999 for Soft polymer dental strip and process therefor. However, it differs from the present invention because Knutson teaches a dental strip comprised of uniformly thick, dead soft polymer, for use as a molding hardenable restorative materials. Matrixing processes for the strip permits the formation of interproximal contacting restorations without wedging, ?0 and the formation of composite restorations with smooth interproximal margins. Other processes for the strip permit the formation of removable restorations, which are separated from prepared tooth surfaces by the strip; the formation of restorations with reduced resin excess, and stabilization of the strip on dental ?5 surfaces by affixing with a temporary adhesive.

Applicant believes that another reference corresponds to U.S. Patent No. 3,108,377 A issued to Alvin Meyer on October 29, 1963 for Matrix for interproximal anterior restorations. However, it differs from the present invention because Meyer teaches a formed plastic strip, which a dentist may use to seal off the area between two teeth at the gum line when a restoration of a plastic nature is being performed.

Applicant believes that another reference corresponds to U.S. Patent No. 4,259,070 A issued to Soelberg, et al. on March 31, 1981 for Dental wedge system. However, it differs from the present invention because Soelberg, et al. teach a dental wedge system that has two interfitting circular-bodied wedges adapted to extend between adjacent teeth and to abut and hold a matrix disposed around one of the teeth.

Applicant believes that another reference corresponds to U.S. Patent No. 4,337,041 A issued to John D. Harsany on June 29, 1982 for Dental wedge. However, it differs from the present ?0 invention because Harsany teaches a dental wedge, for interproximal insertion in the interdental space between teeth for fixing a matrix band in position, including depressions in the lateral surfaces thereof for positively engaging the teeth and locking the wedge therebetween. Means are also provided for simulating the ?5 contour of the concave bulbous papillia of the gingiva disposed in the interdental space when the matrix band is affixed about the tooth and the wedge is interproximal positioned.

Applicant believes that another reference corresponds to U.S. Patent No. 4,563,152 A issued to Scott G. McClure on January 7, 1986 for Combination matrix and interproximal sanding device. However, it differs from the present invention because McClure teaches a combination matrix and interproximal sanding strip for use in preparing, implanting an finishing curable dental o restorations, especially of the light curable type, comprising a flexible strip having opposed sides, each side having a surface coextensive therewith, adapted for insertion between proximal tooth of the side, having a smooth surface portion on one surface for contact with the proximal surfaces surrounding the prepared cavity and the restoration material to be received therein and further having a roughened surface portion on the same side for later use in abrading and removing excess, cured restorative material that has escaped the cavity preparation, without removing the strip from interproximate teeth.

Applicant believes that another reference corresponds to U.S. Patent No. 5,035,615 A issued to Franklin Din on July 30, 1991 for Dental filling band and method of use. However, it differs from the present invention because Din teaches a dental matrix band that is ?5 flexible and bondable to resin based restorative materials. This matrix band will permanently bond to the filling and the tooth. It becomes a permanent part of the composite restoration and may be wholly retained, partially retained, or completely removed depending upon the needs of the dentist, patient and the specific purpose for which this band is used. The dentist forms a prepared cavity. The thin, flexible composite matrix band is then inserted between the tooth and the adjacent tooth. The band is firmly held against the tooth with the surface of the band passively abutting the adjacent tooth. A bonding agent is applied to the appropriate tooth surfaces, the cavity and the band. The agent is cured, the prepared cavity is filled with a composite resin, the resin is cured and the excess portion of the band is removed.

Applicant believes that another reference corresponds to U.S. Patent No. 5,385,469 A issued to Bernard Weissman on January 31, 1995 for Method for forming a coronal replacement for a tooth and product for casting the crown. However, it differs from the present invention because Weissman teaches a tubular dental mold form with at least one scalloped end and a method, utilizing the form, for forming a universal crown in situ on a tooth stump. In a ?0 preferred form, scalloped edges, of different depths, are formed at both ends and are circumferentially offset on one end with respect to the other end.

Applicant believes that another reference corresponds to U.S. ?5 Patent No. 5,403,885 A issued to Voigt, et al. on April 4, 1995 for Transparent material for dental applications. However, it differs from the present invention because Voigt, et al. teach a transparent material based on addition-crosslinking polysiloxanes, which is used as occlusal print for molding side teeth composites.

Applicant believes that another reference corresponds to U.S. Patent No. 5,425,635 A issued to Theodore P. Croll on June 20, 1995 for Matrix band segment and restoration procedure. However, it differs from the present invention because Croll teaches a matrix segment of sufficient size to cover the interproximal area of a tooth restoration is shaped for patient comfort, easy application, and easy removal. The smooth tapered shape of the segment sides provides adequate tooth coverage and minimizes potential gingival laceration. An aperture is located in the segment so that it may be conveniently pulled away after use with a string-like material, such as dental floss.

Applicant believes that another reference corresponds to U.S. Patent No. 5,788,487 A issued to Alvin Meyer on August 4, 1998 for Dental shim. However, it differs from the present invention because ?0 Meyer teaches a dental shim insertable between two adjacent teeth adapted in the restoration procedure of a decayed tooth comprises a unitary, flexible metallic body having an arcuate top portion and an arcuate bottom portion. The shim comprises at least one notch in the edge of the top portion thereof to facilitate positioning of the ?5 shim between the two teeth and to provide a release of strain induced by adapting the shim to a tooth curvature. The shim may include an apron member formed in the bottom portion and a lining veneer covering the concave surface of its bottom. The shim is easily removable after the tooth restoration is complete.

Applicant believes that another reference corresponds to U.S. Patent No. 6,619,956 B1 issued to C. Douglas Weir on September 16, 2003 for Dental matrix strip. However, it differs from the present invention because Weir teaches an elongated flexible dental matrix strip. The strip includes a raised portion extending outward from the surface of the strip. The raised portion tapers towards the distal end of the strip in one embodiment and tapers toward both ends of the strip in another embodiment. The raised portion is sized so that when the strip is inserted between adjacent teeth an interference fit occurs. A light force is used to slide the strip into position between adjacent teeth in such a fashion as to anchor the strip in position. The strip serves to contain filling material in a tooth cavity while the filling material or resin hardens.

Applicant believes that another reference corresponds to U.S. Patent No. 6,712,608 B2 issued to Dan J. Bills on March 30, 2004 for Anatomically contoured matrix bands for use in dental restoration procedures. However, it differs from the present invention because Bills teaches an asymmetrically shaped matrix band. The asymmetrical shape of the matrix band provides form for ?5 molding a dental filling into a shape that closely approximates the asymmetrical and generally trapezoidal shape of a tooth. The matrix band comprises a cross-sectional area that curves asymmetrically in the vertical direction along a curve that is constrained by two radii. The first radius is applied near the top of the matrix band and has a magnitude that is approximately one third of the magnitude of the second radius that is applied at the bottom of the matrix band. The curvature of the cross-sectional area enables the matrix band to also provide form for molding a dental filling with a contact point in the anatomically correct location on a restored tooth.

Applicant believes that another reference corresponds to U.S. Patent No. 8,272,869 B2 issued to Jeffrey Galler on September 25, 2012 for Dental matrix. However, it differs from the present invention because Galler teaches a dental matrix including a band with an edge for placement toward the gingival margin of a tooth to be restored, and a strip of material such as dental floss, attached to and extending along an edge of the band. In the preferred embodiment, buccal and lingual extensions are located beyond a central portion of the band along the edge. The extensions are folded over the strip of material so as to secure the strip of dental ?0 floss to the edge. The strip of material facilitates the insertion of the band in the interproximal space between two teeth.

Applicant believes that another reference corresponds to U.S. Patent No. 8,529,258 B2 issued to Doenges, et al. on September 10, ?5 2013 for Dental implement for tooth restoration. However, it differs from the present invention because Doenges, et al. teach a dental implement that includes a biasing ring and a pair of opposing tines. The biasing ring includes a substantially hoop-like configuration terminating at two opposing ends, which are spaced apart from each other a distance. The pair of opposing tines extends inwardly from each of the two ends of the biasing ring toward each other. Each of the pair of opposing tines is coupled to the respective opposing end about a central region thereof and extends radially outwardly therefrom. Each tine includes a front face having opposing sides, a top end and a bottom end. The front face is defined by two inwardly inclined surfaces which start at the opposing sides and incline inwardly toward each other and intersect to form a peak that extends at least partially between the top end and the bottom end of the front face. The peaks of the opposing tine assemblies face each other.

Applicant believes that another reference corresponds to U.S. Patent Application Publication No. 2005/0287491 Al, published on December 29, 2005 to Charles E. Slone for Bi-laminate matrix and method of use. However, it differs from the present invention ?0 because Slone teaches a dental matrix apparatus that provides a retaining surface for a filling material placed into a tooth preparation in a class II, III or IV restoration. The matrix is made up of a foil strip providing a window covered by an infrared light transparent film. A method provides for placement of the foil and ?5 film strip in contact with a tooth to be filled and shining UV light through the window in order to harden the filling material that abuts the strip.

Applicant believes that another reference corresponds to U.S. Patent Application Publication No. 2006/0019217 Al, published on January 26, 2016 to David W. Yates for Anterior composite matrix dental restoration system. However, it differs from the present invention because Yates teaches an anterior composite matrix dental restoration system that provides a matrix for holding a composite filling material in place as it cures, and a tool for holding the matrix in place during the curing of the filling material. The matrix comprises a thin, flat, flexible, and transparent sheet of plastic material with parallel tubular extensions on the opposite ends. The distal ends of the specialized forceps tool are inserted into the tubular ends of the matrix and used to install, hold, and remove the matrix. The relatively small and narrow tool greatly increases the comfort of both patient and dentist or dental technician by precluding need to insert and hold the fingers in the mouth of the patient to install, hold, and remove the matrix. The matrices may be ?0 provided in different sizes, with at least the tubular end components being optionally color coded to indicate the corresponding size.

Applicant believes that another reference corresponds to U.S. ?5 Patent Application Publication No. 2007/0148613 Al, published on June 28, 2007 to Walter Stoll for Dental strip. However, it differs from the present invention because Stoll teaches an elongated flexible dental strip, which includes front and rear surfaces defining a thickness therebetween. The strip also includes first and second edges defining a lateral width therebetween. A first portion of the strip further is spaced from a second portion along the length of the strip, wherein the thickness of the first portion is different from the thickness of the second portion. The strip has a constant thickness across a lateral width defined between the first and second edges.

Other patents describing the closest subject matter provide for a number of more or less complicated features that fail to solve the problem in an efficient and economical way. None of these patents suggest the novel features of the present invention.

III. SUMMARY OF THE INVENTION

The present invention is a dental separator comprising a bar assembly having first and second bars, a supporting structure, a holder assembly having first and second holders, and a matrix )0 strip. The matrix strip is made of polytetrafluoroethylene.

The first and second bars comprise first and second bar external walls respectively, and first and second bar internal walls respectively. The first and second bars further comprise first and .5 second bar tops respectively and first and second bar bottoms respectively.

The first bar external wall and the first bar internal wall define respective first and second notches, and the second bar external wall and the second bar internal wall define respective third and fourth notches. The first and second bars are T-shaped.

The supporting structure comprises a bottom base, and first and second lateral walls. The first lateral wall comprises a supporting base having an upper face and a lower face. The first and second bars perpendicularly extend from the upper face separated a predetermined distance each other.

The second lateral wall defines first and second protrusions, whereby the first and second protrusions comprise first and second holes respectively.

The first and second protrusions are defined by respective lateral edges and separated by an interior edge. A string extends and is secured at the first and second holes between the first and ?0 second protrusions respectively.

The first and second holders comprise first and second holder tops respectively and first and second holder bottoms respectively. The first holder comprises a first holder external wall, extending ?5 from the first holder external wall are first and second holder lateral walls having first and second lips respectively, whereby the first and second holder lateral walls are perpendicular to the first holder external wall, and the first and second lips are parallel to the first holder external wall.

The second holder comprises a second holder external wall, extending from the second holder external wall are third and fourth holder lateral walls having third and fourth lips respectively, whereby the third and fourth holder lateral walls are perpendicular to the first holder external wall, and the first and second lips are o parallel to the second holder external wall. At least one of the holder lateral walls comprises ruler markings thereon.

The first and second holders mount onto the first and second bars respectively to secure the matrix strip. The matrix strip remains extended and stretched between the first and second bars. The matrix strip and the string are each inserted between sets of adjacent teeth.

It is therefore one of the main objects of the present invention .0 to provide a dental separator.

It is another object of this invention to provide a dental separator having a polytetrafluoroethylene strip as a separator.

It is another object of this invention to provide a dental separator, which is disposable.

It is another object of this invention to provide a dental separator that is volumetrically efficient for carrying and storage.

It is another object of this invention to provide a dental separator, which is of a durable and reliable construction.

It is yet another object of this invention to provide a dental separator that is inexpensive to manufacture and maintain while retaining its effectiveness.

Further objects of the invention will be brought out in the following part of the specification, wherein detailed description is for the purpose of fully disclosing the invention without placing limitations thereon.

IV. BRIEF DESCRIPTION OF THE DRAWINGS

With the above and other related objects in view, the invention ?0 consists in the details of construction and combination of parts as will be more fully understood from the following description, when read in conjunction with the accompanying drawings in which:

Figure 1 is an isometric view of the present invention. ?5

Figure 2 is an isometric view of a bar assembly and a supporting structure of the present invention.

Figure 3 is an isometric view of a holder assembly having a matrix strip.

Figure 4 is an isometric view of a holder of the present invention.

Figure 5 is a front view of a first embodiment of the present invention.

Figure 6 is a front view of a second embodiment of the present invention.

Figure 7 is a front view of the present invention inserted between adjacent teeth while a supporting structure keeps a lower jaw and upper jaw separated.

?0 Figure 8 is a front view of present invention inserted between adjacent teeth wherein a lateral wall is extended to be positioned between a next pair of teeth while a supporting structure keeps the lower jaw and the upper jaw separated.

?5 V. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring now to the drawings, the present invention is a dental separator, and is generally referred to with numeral 10. It can be observed that it basically includes bar assembly 20, supporting structure 50, holder assembly 80, and matrix strip 120.

As seen in figure 1, bar assembly 20 comprises first and second bars 30 and 30', respectively. Holder assembly 80 comprises first and second holders 90 and 90', respectively. Bar assembly 20 and holder assembly 80 secure matrix strip 120. In a preferred embodiment, matrix strip 120 is made of polytetrafluoroethylene or a material having similar characteristics.

Supporting structure 50 comprises bottom base 52, first lateral wall 54, and second lateral wall 56. Second lateral wall 56 comprises first protrusion 64 and second protrusion 66 defined by lateral edges 74, and separated by interior edge 72. First protrusion 64 comprises hole 68, and second protrusion 66 comprises hole 70. String 130 extends and is secured at holes 68 and 70 between )0 first and second protrusions 64 and 66 respectively. In a preferred embodiment, string 130 is made of polytetrafluoroethylene or a material having similar characteristics.

First bar 30 comprises first bar top 36 and first bar bottom !5 38. Second bar 30' comprises second bar top 36' and second bar bottom 38'.

First holder 90 comprises first holder top 92 and first holder bottom 94. Second holder 90' comprises second holder top 92' and second holder bottom 94'. First and second holders 90 and 90' mount onto first and second bars 30 and 30' respectively to secure matrix strip 120, whereby matrix strip 120 remains extended and stretched between first and second bars 30 and 30'.

As seen in figure 2, in a preferred embodiment, first bar 30 is T-shaped, comprising first bar external wall 32, first bar internal wall 34, first bar top 36, and first bar bottom 38. First bar 30 further comprises first and second notches 40.

Similarly in a preferred embodiment, second bar 30' is also T shaped, comprising second bar external wall 32', second bar internal wall 34', second bar top 36', and second bar bottom 38'. Second bar 30' further comprises third and fourth notches 40'. First lateral wall 54 comprises supporting base 58. Supporting base 58 has upper face 60 and lower face 62. First bar 30 and ?0 second bar 30' perpendicularly extend from upper face 60, and are separated a predetermined distance from each other.

As seen in figures 3 and 4, first holder 90 comprises first holder top 92, first holder bottom 94, and first holder external wall ?5 100.

Extending from first holder external wall 100 is first holder lateral wall 102 having first lip 96. In a preferred embodiment, first holder lateral wall 102 is perpendicular to first holder external wall 100, and first lip 96 is parallel to first holder external wall 100.

Extending from first holder external wall 100 is second holder lateral wall 104 having second lip 98. In a preferred embodiment, second holder lateral wall 104 is perpendicular to first holder external wall 100, and second lip 98 is parallel to first holder external wall 100.

Second holder 90' comprises second holder top 92', second holder bottom 94', and second holder external wall 100'.

Extending from second holder external wall 100' is third holder lateral wall 102' having third lip 96'. In a preferred embodiment, third holder lateral wall 102' is perpendicular to second holder external wall 100', and third lip 96' is parallel to second holder external wall 100'. ?0 Extending from second holder external wall 100' is fourth holder lateral wall 104' having fourth lip 98'. In a preferred embodiment, fourth holder lateral wall 104' is perpendicular to second holder external wall 100', and fourth lip 98' is parallel to ?5 second holder external wall 100'.

At least one of first holder lateral wall 102, second holder lateral wall 104, third holder lateral wall 102', or fourth holder lateral wall 104' comprise ruler markings thereon for measuring in millimeters, inches, and / or any markings for measuring distance. In a preferred embodiment, first holder lateral wall 102 and third holder lateral wall 102' are marked in millimeters.

As seen in figure 5, in one embodiment, supporting structure 50 comprises supporting base 58 that perpendicularly extends from both sides, inwardly and outwardly from first lateral wall 54 to define a T-shape.

As seen in figures 5 and 6, present invention 10 is flexible, whereby second lateral wall 56 may be slightly pulled away from or pushed towards first lateral wall 54, in order for matrix strip 120 and string 130 to be inserted between sets of adjacent teeth T as seen in figures 7 and 8. In a preferred embodiment, bottom base 52 comprises inner channel 76 and exterior channel 78 to enable second lateral wall 56 to be pulled away from or pushed towards ?0 first lateral wall 54 without breaking.

As seen in figure 6, in another embodiment, supporting structure 50 comprises supporting base 58 that perpendicularly extends from one side, outwardly from first lateral wall 54 to define ?5 an L-shape.

As seen in figures 7 and 8, present invention 10 is used to separate, or divide pairs of teeth T, whereby matrix strip 120 and string 130 are each inserted between sets of adjacent teeth T, enabling present invention 10 to remain suspended and in place on its own with tension force. The tension force is created by supporting structure 50, matrix strip 120 and string 130. Matrix strip 120 separates adjacent teeth T during a dental procedure and is adjusted according to size of teeth T. Supporting base 58 is useful to define or establish a lower tooth limit or line during tooth / teeth or dental reconstruction. Present invention 10 is disposable. In addition, supporting structure 50 keeps upper and lower jaws separated during a dental procedure, whereby bottom base 52 keeps lower jaw separated a predetermined distance from the upper jaw.

It is noted that the ruler markings thereon are for measuring a tooth to be prepared / repaired and an adjacent tooth T or teeth. The ruler markings are in millimeters, inches, and / or any markings for measuring. In a preferred embodiment, first holder M lateral wall 102 and third holder lateral wall 102' are marked in millimeters.

Present invention 10 comprises the following advantages:

1) Teeth T are separated during restorations procedures, crowns and veneers.

2) Teeth T are isolated, avoiding chemical adhesion during the preparation and/or material(s) adhesion. 3) Unitary pieces ready to use without the aid of an assistant and used solely by the operator. 4) Matrix strips 120 are held. 5) Easy handling, without the need of any tools. 6) Exact contact point is reproduced for each tooth. 7) Contralateral adjacent tooth is visible. 8) Retained by itself without getting attached to other teeth T. 9) Adaptable to all anterior teeth T. 10) Disposable. 11) Biocompatible. 12) Easy removing. 13)Resistant materials. 14)Easy removal of excess material. 15)Teeth T measurement. 16)Measurement reference for other teeth T.

The foregoing description conveys the best understanding of .0 the objectives and advantages of the present invention. Different embodiments may be made of the inventive concept of this invention. It is to be understood that all matter disclosed herein is to be interpreted merely as illustrative, and not in a limiting sense.

Claims

VI. CLAIMS What is claimed is:

1. A dental separator comprising:

A) a bar assembly having first and second bars;

B) a supporting structure;

C) a holder assembly having first and second holders; and

D) a matrix strip.

2. The dental separator set forth in claim 1, further characterized in that said matrix strip is made of polytetrafluoroethylene.

3. The dental separator set forth in claim 1, further .0 characterized in that said first and second bars comprise first and second bar external walls respectively, and first and second bar internal walls respectively.

4. The dental separator set forth in claim 1, further .5 characterized in that said first and second bars comprise first and second bar tops respectively, and first and second bar bottoms respectively.

5. The dental separator set forth in claim 3, further characterized in that said first bar external wall and said first bar internal wall define respective first and second notches, and said second bar external wall and said second bar internal wall define respective third and fourth notches.

6. The dental separator set forth in claim 1, further characterized in that said first and second bars are T-shaped.

7. The dental separator set forth in claim 1, further characterized in that said supporting structure comprises a bottom base, and first and second lateral walls.

8. The dental separator set forth in claim 7, further characterized in that said first lateral wall comprises a supporting base having an upper face and a lower face.

9. The dental separator set forth in claim 8, further ?0 characterized in that said first and second bars perpendicularly extend from said upper face separated a predetermined distance each other.

10. The dental separator set forth in claim 7, further ?5 characterized in that said second lateral wall defines first and second protrusions, whereby said first and second protrusions comprise first and second holes respectively.

11. The dental separator set forth in claim 10, further characterized in that said first and second protrusions are defined by respective lateral edges and are separated by an interior edge.

12. The dental separator set forth in claim 10, further characterized in that a string extends between said first and second protrusions.

13. The dental separator set forth in claim 12, further characterized in that said string is secured at said first and second holes.

14. The dental separator set forth in claim 4, further characterized in that said first and second holders comprise first and second holder tops respectively, and first and second holders bottoms respectively. ?0

15. The dental separator set forth in claim 14, further characterized in that said first holder comprises a first holder external wall, extending from said first holder external wall are first and second holder lateral walls having first and second lips ?5 respectively, whereby said first and second holder lateral walls are perpendicular to said first holder external wall, and said first and second lips are parallel to said first holder external wall.

16. The dental separator set forth in claim 15, further characterized in that said second holder comprises a second holder external wall, extending from said second holder external wall are third and fourth holder lateral walls having third and fourth lips respectively, whereby said third and fourth holder lateral walls are perpendicular to said first holder external wall, and said first and second lips are parallel to said second holder external wall.

17. The dental separator set forth in claim 16, further characterized in that at least one of said holder lateral walls comprises ruler markings thereon.

18. The dental separator set forth in claim 1, further characterized in that said first and second holders mount onto said first and second bars respectively to secure said matrix strip.

?0

19. The dental separator set forth in claim 1, further characterized in that said matrix strip remains extended and stretched between said first and second bars.

20. The dental separator set forth in claim 12, further ?5 characterized in that said matrix strip and said string are each inserted between sets of adjacent teeth.

36' 80 120 90' 92' 10 90 30' 36 94' 38' 92 130 20 66 60 2020101357

30 62 70 94 64 38 74 54 74 72 58 68 50 52 56 76 78 Fig. 1 10 36' 32' 40' 34' 20 30' 32 40' 40 36 34 38' 40 30 66 60 62 70 38 64 74 54

74 72 58 68 50 52 56 76 78 Fig. 2

100' 92' 104' 80 98'

90' 102' 104 100 96' 2020101357

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102 Fig. 3 120

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102 92 100

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Fig. 4 98

92 120 10 130 80 20 90 94 58 2020101357

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76 56 50

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78 52

Fig. 5 92 120 10 130 80 20 90

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Fig. 6

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Fig. 7

80 64 120 2020101357

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Fig. 8