Dental handpiece

Abstract

The invention relates to a dental handpiece comprising a handle and a housing on which a first light emitting diode and a first optical sensor are arranged. According to the invention, the housing comprises a second light emitting diode, a second optical sensor and a shielding window for each optical sensor. The dental handpiece includes a mechanism to supply compressed air on each shielding window. The housing includes an opening for supplying compressed air to each shielding window. A diffuser is arranged in each opening and is used for generating air jet flow forming an air curtain. The technical problem is that an optical sensor is reliably protected through an air curtain, and a high-quality three-dimensional image of the oral cavity is obtained when the dental handpiece is used for operating the oral cavity.

Description

Technical Field

[0001] The present invention relates to a dental device, more specifically to a dental handpiece comprising a handle and a housing, with an optical emission source represented by at least one light emitting diode connected to an electrical power supply, said handpiece having an optical sensor adapted to be connected to a visualization device, said handpiece being usable by a dentist during a dental procedure. Background Art

[0002] A known example of the prior art is a dental handpiece comprising: a handle and a housing with an optical emission source represented by at least one light emitting diode connected to an electrical power supply, said housing comprising an optical sensor adapted to be connected to a visualization device, see the description of utility model RU114603U1.

[0003] The device is the closest technology to the claimed invention and is considered a prototype. Therefore, the claimed invention should be described based on the differences from the prototype.

[0004] The disadvantage of the device is that it has a camera (optical sensor) which allows to project an image of the oral cavity onto an external screen but does not ensure that no particles from the oral cavity reach its surface during dental procedures. Indeed, certain tools, such as a drill, can generate high-speed flying solid fragments which can pass through the ambient air and reach the camera.

[0005] Another major drawback of the prototype is that it does not allow obtaining high quality three-dimensional images of the oral cavity in which the dental handpiece operates. Summary of the invention

[0006] The main purpose of the present invention is to provide a dental handpiece comprising a handle and a housing, with an optical emission source represented by at least one first light emitting diode connected to an electrical power supply, said dental handpiece having a first optical sensor thereon adapted to be connected to a visualization device, said dental handpiece being able to ensure a high quality stable three-dimensional image, which is the stated technical problem.

[0007] To this end,

[0008] a housing having a second light emitting diode connected to an electrical power supply, said housing having a second optical sensor connected to the visualization means,

[0009] The housing has a first transparent shielding window for the first optical sensor and a second transparent shielding window for the second optical sensor,

[0010] the handpiece has a mechanism for supplying compressed air on the first and second transparent shielding windows,

[0011] The housing has a first opening for supplying compressed air to the first transparent shielding window and a second opening for supplying compressed air to the second transparent shielding window, the two openings being connected to a device for supplying compressed air,

[0012] • A diffuser is positioned in each opening, said diffuser being designed such that an air jet is generated to form an air curtain in front of the screened window.

[0013] In addition to simply blowing air on the transparent shielding window of the optical sensor to prevent fogging, these useful features can also form a strong air curtain to protect the shielding window from contamination by solid particles and droplets generated during the preparation of patient biopsy tissue, that is, to protect the shielding window from contamination by any particles on the external optical elements, in other words, due to the implementation of the air curtain, reliable protection of the optical sensor is ensured. The second optical sensor is also reliably protected from any particles on the external optical elements, which makes it possible to generate a stereoscopic image of the oral cavity.

[0014] In addition, pre-rendered CT images can be used to generate a virtual 3D model. The virtual 3D model can be combined with CT images using optical sensors to view hidden tooth cavities so that it is understood how the cutting tip is positioned relative to these cavities.

[0015] There is also an alternative embodiment of the invention, in which the housing has a third light emitting diode connected to the electrical power supply, said housing having a third optical sensor adapted to be connected to the visualization means.

[0016] These useful features allow for embodiments of the dental handpiece that produce three optical sensors that generate better quality three-dimensional images.

[0017] There is also an alternative embodiment of the present invention, wherein the housing has a fourth light emitting diode connected to the electrical power supply, and the housing has a fourth optical sensor adapted to be connected to the visualization device.

[0018] These useful features make it possible to propose an alternative form of dental handpiece in which four optical sensors generate three-dimensional images of even better quality.

[0019] There is also an alternative embodiment of the invention in which each diffuser is located from the working end of the housing and is designed so as to direct the air jet away from the housing end.

[0020] These useful features make it possible to propose an alternative form of dental handpiece in which the optical sensor is located further from the housing end than the drill bit. In this case, the air jet is directed tangentially to the shielding windows and leaves the working end of the housing, i.e., in operating conditions, the patient's mouth.

[0021] In addition, there is a possible alternative embodiment of the invention in which each diffuser is positioned from the housing handle and is designed so as to direct the air jet away from the handle. Under these conditions, the housing has a protrusion positioned from the working end, the surface shape of the protrusion causing the air jet to turn 120°-140°.

[0022] These useful features allow an alternative form of dental handpiece to be proposed in which the drill bit is located further from the housing end than the optical sensor. The air jet is directed tangentially onto the shielding window and towards the housing end and then rotated through the projection, ie, in the operating condition, out of the patient's mouth.

[0023] Furthermore, since the housing has a protrusion positioned from the working end, the surface shape of the protrusion turns the air jet by 120°-140°, so that the formed jet consists of two echelons with different flow directions. This complex flow of the high-speed jet can improve the interception efficiency by expanding the speed and density range of the flying particles. This additionally prevents contamination of the optical device.

[0024] There is another possible embodiment of the invention in which each diffuser is oriented vertically toward the handle. The diffuser is designed to direct the air jet to be ejected laterally from the handle. Under these conditions, the housing has a protrusion positioned from the working end, the surface shape of the protrusion causing the air jet to rotate 120°-140°.

[0025] These useful features allow for an alternative form of dental handpiece in which the optical sensor is positioned to the side of the drill bit and the air jet is directed from the central axis of the housing and rotated similarly to the above described embodiments.

[0026] Finally, there is a possible embodiment of the invention in which each diffuser is designed so as to generate an air jet with an outflow velocity of from 6 m / s to 50 m / s, which forms an angle of from 0° to 15° with the plane of the transparent shielding window.

[0027] These useful characteristics make it possible to propose an alternative optional form of diffuser with targeted specifications and ensuring maximum protection effect for the optical sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Other notable features and advantages of the present invention will become apparent from the following description, which includes for illustration but not limitation the following features, with reference to the accompanying drawings, in which:

[0029] ● Figure 1 and Figure 2represents a dental handpiece designed according to a first embodiment of the invention, wherein according to the invention two optical sensors are longitudinally (along the axis MN of the handle 5, Figure 2 ) is located; Figure 1 Represents a side view of a dental handpiece (partial cross section A of the housing 50 element with the MN axis of the handle 5, Figure 2 ), Figure 2 A plan view representing a dental handpiece;

[0030] ● Figure 3 A vertical longitudinal cross-sectional view (along the MN axis of the handle 5, BB plane, see FIG. 5 ) of a dental handpiece according to a first embodiment of the present invention. Figure 2 ), with two optical sensors positioned longitudinally (along the MN axis of the handle 5, see Figure 2 );

[0031] ● Figure 4 and Figure 5 Represents a dental handpiece according to the present invention (see Figure 1 ) an enlarged cross section A of the housing 50 element showing the direct air jet and the reverse air jet blowing on the transparent shielding window;

[0032] ● Figure 6 and Figure 7 represents a dental handpiece according to a second embodiment of the invention, wherein two optical sensors are positioned transversely (through the axis MN of the handle 5, see Figure 7 ); Figure 6 Represents a side view of a dental handpiece, Figure 7 A plan view representing a dental handpiece;

[0033] ● Figure 8 and Fig. 9 represents a dental handpiece according to a third embodiment of the invention, wherein the two optical sensors are positioned at an angle of 90° relative to each other (and at an angle of 45° to the longitudinal axis MN of the handle 5, see Fig. 9 ); Figure 8 Represents a side view of a dental handpiece, Fig. 9 a plan view representing a dental handpiece;

[0034] ● Fig.10 and Fig.11 Representing a cross section of a dental handpiece according to a fourth embodiment of the invention, the three optical sensors show a "direct" position, wherein the first optical sensor and the second optical sensor are positioned at an angle of 90° relative to each other (and at an angle of 45° to the longitudinal axis MN of the handle 5, see Fig.11), and the third optical sensor is positioned from the handle 5 along the longitudinal axis MN, the angle between the first optical sensor and the second optical sensor is equal to the angle between the second optical sensor and the third optical sensor and corresponds to 135° ( Fig.11 ); Fig.10 Represents a side view of a dental handpiece (partial cross section of the housing 50 element with the axis MN of the handle 5, Fig.11 ), Fig.11 A plan view representing a dental handpiece;

[0035] ● Fig.12 and Fig.13 A cross section representing a dental handpiece according to a fourth embodiment of the invention with three optical sensors showing an "inverted" position, wherein a first optical sensor is positioned along the longitudinal axis MN, towards the handle 5 ( Fig.13 ), the second optical sensor is positioned from one side of the longitudinal axis MN ( Fig.13 The third optical sensor is positioned at an angle of 120° from the handle 5 to the longitudinal axis MN. Fig.13 The left side of the middle), the angle is 120° outward from the handle 5 relative to the longitudinal axis MN, and the angle between the second optical sensor and the third optical sensor is also equal to 120°; Fig.12 Represents a side view of a dental handpiece (partial cross section of the housing 50 element with the axis MN of the handle 5, Fig.13 ), Fig.13 A plan view representing a dental handpiece;

[0036] ● Fig.14 and Fig.15 Represents a dental handpiece according to a fifth embodiment of the invention, with four optical sensors showing positions "vertically intersecting, symmetrical with respect to the longitudinal axis MN, longitudinal to the longitudinal axis MN" (see Fig.15 ), wherein the first optical sensor is positioned along the longitudinal axis MN in the direction of the handle 5 ( Fig.15 ), the second optical sensor is positioned to be positioned from one side of the longitudinal axis MN ( Fig.15 The third optical sensor is positioned perpendicular to the longitudinal axis MN from the direction of the handle 5 outward along the longitudinal axis MN ( Fig.15 ), the fourth optical sensor is positioned from the other side of the longitudinal axis MN ( Fig.15 on the left side, in front of the second optical sensor), perpendicular to the longitudinal axis MN ( Fig.15 ); Fig.14 Represents a side view of a dental handpiece (with a partial cross section of the housing 50 element including the axis MN of the handle 5, Fig.15 ), Fig.15 A plan view representing a dental handpiece;

[0037] ● Fig.16 and Fig.17 The dental handpiece according to the sixth embodiment of the present invention is represented, wherein the four optical sensors are shown positioned "perpendicularly crossed, symmetrical with respect to the longitudinal axis MN, at an angle of 45° with respect to the longitudinal axis MN" (see Fig.17 ), wherein the first optical sensor is positioned from the side of the longitudinal axis MN ( Fig.17 on its right side), along the longitudinal axis MN toward the handle 5 ( Fig.17 ), at an angle of 45° relative to the axis MN, the second optical sensor is positioned laterally from the longitudinal axis MN ( Fig.17 on its right side), along the longitudinal axis MN, in the direction from the handle 5 ( Fig.17 ), the third optical sensor is positioned at a 90° angle relative to the first optical sensor and is located on the side of the longitudinal axis MN ( Fig.17 on its left side), toward handle 5 ( Fig.17 ), with respect to the axis MN at an angle of 45°, the fourth optical sensor is positioned on the side of the longitudinal axis MN ( Fig.17 ), along the longitudinal axis MN, in the direction from the handle 5 ( Fig.17 ), at an angle of 90° relative to the third optical sensor; Fig.16 Represents a side view of a dental handpiece, Fig.17 A plan view representing a dental handpiece.

[0038] like Figures 1 to 17 As shown:

[0039] S-Dental Handpiece;

[0040] MN - preferred axis of the dental handpiece;

[0041] 1-Rotor set

[0042] 2-Drill bit

[0043] 3-Chuck clamping button;

[0044] 4-Dental handpiece cover;

[0045] 5-Dental handpiece handle;

[0046] 50 - dental handpiece housing;

[0047] 6- Optical sensor sleeve;

[0048] 7- Optical sensor board latch;

[0049] 8-"Midwest4" adapter;

[0050] 9- Optical sensor board protection;

[0051] 10- Optical sensor board;

[0052] 11- Air supply line;

[0053] 12- first optical sensor;

[0054] 120 - second optical sensor;

[0055] 13- a first light emitting diode;

[0056] 14- Second diffuser

[0057] 15-First transparent shielding window

[0058] 16- protrusion;

[0059] 17-connector socket;

[0060] 18-Injection supply line.

[0061] The compressed air source (dental kit compressor) and the dental unit are not shown in the figure. DETAILED DESCRIPTION

[0062] according to Figures 1 to 17 , the dental handpiece comprises a handle 5 and a housing 50 with an optical emission source represented by at least one first light emitting diode 13 connected to an electrical power supply. Said housing 50 comprises a first optical sensor 12 adapted to be connected to a visualization device.

[0063] The housing 50 (more precisely, its optical source) comprises a second light emitting diode connected to an electrical power supply. The housing 50 comprises a second optical sensor adapted to be connected to a visualization device. The housing 50 comprises a first transparent shielding window 15 ( Figures 4 to 5 ) and a second transparent shielding window for a second optical sensor. The handpiece has a mechanism for supplying compressed air to the first and second shielding windows. The housing 50 includes a first opening for supplying compressed air to the first shielding window and a second opening for supplying compressed air to the second shielding window, the two openings being connected to the mechanism for supplying compressed air. Each opening has a diffuser designed to generate an air jet, the air jet forming an air curtain in front of the transparent shielding window. See Figures 1 to 9 .

[0064] The housing 50 optionally comprises a third light emitting diode connected to an electrical power supply. The housing 50 (more precisely, its optical source) comprises a third optical sensor adapted to be connected to the visualization means. Figures 10 to 13 .

[0065] The housing 50 further comprises a fourth light emitting diode connected to the electrical power supply. The housing 50 (more precisely, its optical source) comprises a fourth optical sensor adapted to be connected to the visualization means. Figures 14 to 17 .

[0066] Each diffuser may be positioned on the side of the working end of the housing and may be designed so as to direct the air jet away from the working end of the housing. Figure 4 .

[0067] Each diffuser may be positioned on the side of the handle of the housing and may be designed so as to direct the air jet away from the handle of the housing. Under these conditions, the housing has a protrusion positioned from the working end, the surface shape of which turns (deflects) the air jet by 120°-140°. See Figure 5 .

[0068] Each diffuser can be oriented vertically toward the handle of the housing and can be designed so that the directed air jet leaves from the handle of the housing. Under these conditions, the housing has a protrusion positioned from the working end, the surface shape of the protrusion turns the air jet 120°-140°.

[0069] Each diffuser may be designed so as to generate an air jet having an outflow velocity from 6 m / s to 50 m / s and forming an angle from 0° to 15° with the plane of the transparent shielding window.

[0070] The dental handpiece is also designed with several air supply options: direct and reverse (rotating air curtain), as well as different positions of the optical sensors (from two to four, depending on their number).

[0071] The operation of the dental handpiece is as follows: The following is the most detailed example of the embodiment of the present invention, but the example does not limit other applications of the present invention.

[0072] Compressed air is supplied from the dental unit compressor to the housing 50 in a channeled air jet (inside the handle 5) through the compressed air supply pipe 11. As the air passes through the housing 50, it enters the directional diffuser 14, forming a flat jet with an angle of up to 15 degrees relative to the housing surface, with an outflow velocity of from 6 m / s to 50 m / s. The high-speed jet does not allow foreign particles with a density and velocity typical for dental interventions to pass through its core and moves them away from each shielding window of each optical sensor.

[0073] By varying the geometry of the protrusions and the diffuser, the quantitative properties of technical parameters such as the air jet turning angle, the air jet outflow velocity and the angle between the air jet outflow and the transparent shielding window plane can be adjusted within a continuously variable range.

[0074] The selection of the specific technical parameter value range is determined experimentally and depends on the blowing efficiency of the optical sensor (camera) shielding window. The blowing efficiency control method should be a visual control of the readability of the image transmitted from the optical sensor and contaminated by artifacts caused by foreign particles and droplets entering the shielding window. The number of image artifacts should be considered as a standard for the blowing efficiency to be divided into four levels: "None" - no visible artifacts caused by foreign particles and droplets; "Mild" - foreign particles and droplets are not retained on the surface of the transparent shielding window and do not affect the readability of the transmitted image; "Moderate" - foreign particles and droplets remain on the surface of the shielding window and affect the image transmitted from the optical sensor, with sufficient readability for guiding the dental handpiece in the operating environment; "Severe" - foreign particles and droplets remain on the surface of the shielding window, making the image transmitted from the optical sensor unreadable and unsuitable for correct positioning of the dental handpiece in the operating environment.

[0075] By adjusting the shape of the surface of the projection towards the diffuser, the air jet rotation angle can be adjusted in the range from 120° to 140°. The value of the projection inclination angle should be the geometric parameter for the air jet rotation angle. The projection inclination angle is found between the tangent line of the concave edge and the plane of the transparent shielding window. For the relationship between the air jet rotation angle, the image artifact level and the above-mentioned geometric parameters, see Table 1. For examples of embodiments of the present invention with boundary values ​​of the above-mentioned ranges, see Figure 1 .

[0076] Table 1 Correlation between the air jet rotation angle and image artifact level and the protrusion tilt angle

[0077] No Air jet rotation angle, degrees Protrusion inclination angle value, degree Image artifact level 1 115 85 medium 2 120 80 mild 3 125 75 mild 4 130 70 none 5 135 65 none 6 140 60 none

[0078] By adjusting the diffuser outlet cross-sectional area, the air jet outflow velocity is adjusted in the range from 6m / s to 50m / s. The geometric parameter characterizing the air jet velocity is the value of the circular cross-sectional diameter equal to the diffuser outlet cross-sectional area. The relationship between the air jet outflow, the image artifact level and the above geometric parameters is shown in Table 2.

[0079] Table 2 Correlation between air jet outflow velocity and image artifact level and equivalent circular cross-section diameter

[0080]

[0081]

[0082] By adjusting the opening angle of the diffuser outlet cross section, the angle between the air curtain outflow direction and the shielding window plane is adjusted in the range of 0 to 15 degrees. The opening angle of the diffuser outlet cross section is considered to be a characteristic geometric parameter. The relationship between the angle between the air curtain outflow direction and the shielding window plane, the image artifact level and the above geometric parameters is shown in Table 3.

[0083] Table 3. Correlation between the angle between the air curtain outflow direction and the shielding window plane, the image artifact level and the opening angle of the diffuser outlet cross section

[0084]

[0085] Several optical sensors can obtain a three-dimensional image of the oral cavity. In other words, the operator of the dental handpiece according to the invention will be able to see a three-dimensional image on the screen during any intervention in the oral cavity.

[0086] In addition, a virtual three-dimensional (3D) model can be generated using pre-rendered CT images. The virtual three-dimensional (3D) model can be combined with the CT image through the optical sensor. Under these conditions, the operator of the dental handpiece according to the present invention will be able to view hidden tooth cavities and understand how the cutting tip is positioned relative to these tooth cavities.

[0087] A person skilled in the art can implement the claimed dental handpiece in practice and ensure that the claimed objectives are met after implementation, which leads to the conclusion that the invention meets the requirement of “industrial applicability”.

[0088] A series of practical tests were performed to confirm the operability of the proposed dental handpiece. The tests showed that, throughout the operation, the optical windows were not contaminated and all optical sensors continued to transmit clear images, which allowed for three-dimensional imaging of the oral cavity.

[0089] Therefore, these novel features can achieve the required technical result, namely, ensuring reliable protection of the optical sensor and obtaining high-quality three-dimensional images of the patient's oral cavity by implementing the air curtain when the operator uses the dental handpiece of the present invention.

[0090] Therefore, (see Figure 1-17 ), the present invention relates to a dental handpiece, comprising:

[0091] a handle 5 extending along an axis MN and exhibiting a first end adapted to be connected to a dental unit (dental unit), and a second free end axially opposite the first end,

[0092] A housing 50 rigidly connected to the second free end of the handle 5 and comprising:

[0093] o an optical emission source represented by at least one first light emitting diode 13 connected to an electrical power supply,

[0094] o A first optical sensor 12 adapted to be connected to a visualization device.

[0095] According to the invention, the optical emission source further comprises a second light emitting diode different from the first light emitting diode 13. The second light emitting diode is connected to an electrical power supply. Under these conditions, the housing 50 further comprises:

[0096] a second optical sensor 120 different from the first optical sensor 12, which is adapted to be connected to a visualization device,

[0097] a first transparent shielding window 15 adapted to protect the first optical sensor 12,

[0098] A second transparent shielding window different from the first transparent shielding window 15 adapted to protect the second optical sensor 120 .

[0099] Under these conditions, the dental handpiece S also includes a mechanism 11 for supplying compressed air on the first shielding window 15 and on the second transparent shielding window. The housing 50 also includes:

[0100] a first opening adapted for supplying compressed air to the first transparent shielding window 15, said first opening being connected to the means 11 for supplying compressed air,

[0101] A second opening different from the first opening, said second opening being adapted to supply compressed air to the second transparent shielding window, said second opening being connected to the means 11 for supplying compressed air.

[0102] Under these conditions, a first diffuser 14 is positioned in the first opening. The first diffuser 14 is adapted to generate an air jet to form an air curtain in front of the first transparent shielding window 15. A second diffuser different from the first diffuser 14 is positioned in the second opening. The second diffuser is adapted to generate an air jet to form an air curtain in front of the second transparent shielding window.

[0103] Preferably, the optical emission source further comprises a third light emitting diode different from the first light emitting diode and the second light emitting diode. The third light emitting diode is connected to an electrical power supply. The housing 50 further comprises a third optical sensor different from the first optical sensor 12 and the second optical sensor 120. The third optical sensor is adapted to be connected to a visualization device.

[0104] Preferably, the optical emission source further comprises a fourth light emitting diode different from the first light emitting diode, the second light emitting diode and the third light emitting diode. The fourth light emitting diode is connected to an electrical power supply. The housing 50 further comprises a fourth optical sensor different from the first optical sensor 12, the second optical sensor 120 and the third optical sensor. The fourth optical sensor is adapted to be connected to the visualization device.

[0105] In the first embodiment of the present invention ( Figure 4 ), each of the first diffuser 14 and the second diffuser is positioned from the working end of the housing 50. Each of the diffusers is adapted to guide the air jet to leave from the working end of the housing 50 along the axis MN of the handle 5.

[0106] In an alternative (relative to the above-mentioned first embodiment) second embodiment of the present invention ( Figure 5 ), each of the first diffuser 14 and the second diffuser is positioned from the working end of the housing 50. Each of the diffusers is adapted to direct an air jet to leave from the working end of the housing 50 along the axis MN of the handle 5. The housing 50 includes a protrusion 16 positioned from the working end of the housing 50. The protrusion has a surface shape that causes the air jet outgoing from the corresponding diffuser to rotate at a first angle, the first angle being included in a first interval from 120° to 140°.

[0107] In an alternative third embodiment of the present invention (relative to the first and second embodiments described above), each of the first diffuser 14 and the second diffuser is positioned perpendicular to the handle 5. Each of the first diffuser 14 and the second diffuser is adapted to direct the air jet to be ejected laterally from the handle 5. The housing 50 includes a protrusion positioned from the working end. The protrusion has a surface shape that causes the air jet outgoing from the corresponding diffuser to rotate at a first angle, the first angle being included in a first interval from 120° to 140°.

[0108] Preferably, each of the first diffuser 14 and the second diffuser is adapted to generate an air jet with an outflow velocity from 6 m / s to 50 m / s. The outflow velocity of the air jet forms a second angle with the transparent shielding window plane corresponding to each diffuser, and the second angle is included in a second interval from 0° to 15°.

[0109] Any of the first, second, third and fourth light emitting diodes described above may have a precise geometric shape. However, preferably, any of the light emitting diodes from the above specifically has a Figure 4 and Figure 5Annular pattern as shown in the example in: According to the applicant's observation, this annular pattern ensures the most uniform (without hot spots and / or shadows) illumination of the oral cavity, sufficient to obtain high-quality three-dimensional images.

Claims

1. A dental handpiece(S), comprising: a handle (5) extending along an axis (MN) and exhibiting a first end adapted to be connected to the dental unit and a second free end axially opposite the first end, A housing (50) rigidly connected to the second free end of the handle (5) and comprising: o an optical emission source represented by at least one first light emitting diode (13) connected to an electrical power supply, o a first optical sensor (12) adapted to be connected to the visualization device, The optical emission source further comprises a second light emitting diode which is different from the first light emitting diode (13), wherein the second light emitting diode is connected to an electrical power supply, The housing (50) further comprises: a second optical sensor (120) different from the first optical sensor (12), the second optical sensor being adapted to be connected to a visualization device, a first transparent shielding window (15) adapted to protect the first optical sensor (12), ● a second transparent shielding window different from the first transparent shielding window (15) adapted to protect the second optical sensor (120), The dental handpiece (S) further comprises a mechanism (11) for supplying compressed air to the first shielding window (15) and the second transparent shielding window, In that the housing (50) additionally comprises: a first opening adapted for supplying compressed air to the first transparent shielding window (15), said first opening being connected to a means (11) for supplying compressed air, a second opening different from the first opening, the second opening being adapted to supply compressed air to the second transparent shielding window, the second opening being connected to means (11) for supplying compressed air, In that the first diffuser (14) is positioned in the first opening, In that the first diffuser (14) is adapted to generate an air jet to form an air curtain in front of the first transparent shielding window (15), in that a second diffuser different from the first diffuser (14) is positioned in the second opening, In that, the second diffuser is adapted to generate an air jet to form an air curtain in front of the second transparent shielding window.

2. The dental handpiece (S) according to claim 1, characterized in that The optical emission source further includes a third light emitting diode different from the first light emitting diode and the second light emitting diode, in that the third light emitting diode is connected to an electric power supply, In other words, the housing (50) further comprises a third optical sensor different from the first optical sensor (12) and the second optical sensor (120), wherein the third optical sensor is adapted to be connected to the visualization device.

3. The dental handpiece (S) according to claim 1, characterized in that The optical emission source further includes a fourth light emitting diode different from the first light emitting diode, the second light emitting diode and the third light emitting diode, in that the fourth light emitting diode is connected to an electric power supply, In other words, the housing (50) further comprises a fourth optical sensor different from the first optical sensor (12), the second optical sensor (120) and the third optical sensor, and the fourth optical sensor is adapted to be connected to the visualization device.

4. The dental handpiece (S) according to any one of claims 1 to 3, characterized in that Each of the first diffuser (14) and the second diffuser is positioned from the working end of the housing (50), each diffuser being adapted to direct a jet of air away from the working end of the housing (50) along an axis (MN) of the handle (5).

5. The dental handpiece (S) according to any one of claims 1 to 3, characterized in that Each of the first diffuser (14) and the second diffuser is positioned from the working end of the housing (50), each diffuser being adapted to direct a jet of air away from the working end of the housing (50) along the axis (MN) of the handle (5), In that the housing (50) includes a protrusion (16) positioned from a working end of the housing (50), and The invention is characterized in that the protrusion (16) has a surface shape which causes the air jet outgoing from the corresponding diffuser to turn at a first angle, the first angle being included in a first interval from 120° to 140°.

6. The dental handpiece (S) according to any one of claims 1 to 3, characterized in that Each of the first diffuser (14) and the second diffuser is oriented perpendicular to the handle (5), In that each of the first diffuser (14) and the second diffuser is adapted to direct the air jet to be ejected laterally from the handle (5), In that the housing (50) includes a protrusion positioned from the working end, and In that the protrusion has a surface shape which turns the air jet outgoing from the corresponding diffuser at a first angle which is included in a first interval from 120° to 140°.

7. The dental handpiece (S) according to any one of claims 1 to 3, characterized in that Each of the first diffuser (14) and the second diffuser is adapted to generate an air jet having an outflow velocity in the range of 6 m / s to 50 m / s, and The outflow velocity forms a second angle with a plane of the transparent shielding window corresponding to each diffuser, and the second angle is included in a second interval from 0° to 15°.

Images