dental treatment unit

Abstract

To provide a dental treatment unit reliably preventing erroneous irradiation of a human body with ultraviolet light having sufficient intensity for sterilization.SOLUTION: A dental treatment chair 110 includes a seating sensor 113g for detecting seating of a patient. A shadowless lamp 140 includes a shadowless lamp body 141 having a visible light source 141A for illuminating an oral cavity of the patient, a germicidal light source 141C disposed on the opposite side of the visible light source 141A and applying ultraviolet light, and a gripping handle 142 freely attachable to the shadowless lamp body 141. The shadowless lamp body 141 includes a handle attachment detection sensor 141c for detecting attachment of the gripping handle 142. In a state where the seating sensor 113g does not detect the seating of the patient and the handle attachment detection sensor 141c does not detect the attachment of the gripping handle 142, a control device 150 turns on the germicidal light source 141C of the shadowless lamp 140.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a dental treatment unit, and more particularly to a dental treatment unit equipped with a shadowless lamp having an integrated germicidal light source. [Background technology]

[0002] Generally, dental treatment units are provided with a shadowless lamp to illuminate the affected area. As such a shadowless lamp, a shadowless lamp that has a germicidal lamp (sterilizing light source) integrated behind a lamp (visible light source) and effectively sterilizes the treatment room to prevent hospital infections, etc., has been known (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 5-20717 (see, for example, FIG. 1) Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned shadowless lamp, the germicidal lamp does not necessarily need to be kept on all the time. For example, the germicidal lamp may be automatically turned on only when the lamp is facing downward within a certain angle range, and automatically turned off when the lamp is used in a horizontal or upward orientation. Furthermore, a manual switch may be provided so that when not in use, the shadowless lamp is pointed downward within the predetermined angle range and the manual switch is operated to turn on the germicidal lamp.

[0005] However, with the above-mentioned shadowless lamp, the germicidal lamp is turned on when the lamp is facing downwards or when the manual switch is activated, so there is a risk that ultraviolet light will be accidentally emitted from the germicidal lamp if a patient is seated in the dental treatment unit, or if a patient or staff member is within the irradiation range of the germicidal lamp even when no patient is seated in the dental treatment unit. This problem becomes particularly serious when the intensity of ultraviolet light is strong enough to sterilize the substance.

[0006] Therefore, the present invention solves the problems of the prior art as described above, and the object of the present invention is to provide a dental treatment unit that reliably prevents the human body from being accidentally exposed to ultraviolet rays that are strong enough to cause sterilization. [Means for solving the problem]

[0007] The invention of claim 1 is a dental treatment unit comprising a dental treatment chair in which a patient sits, a shadowless lamp that irradiates light toward the dental treatment chair, and a control device that controls the on / off of the shadowless lamp, wherein the dental treatment chair has a seating sensor that detects whether the patient is sitting, the shadowless lamp has a shadowless lamp body that has a visible light source that illuminates the inside of the patient's mouth and a germicidal light source that is positioned on the opposite side of the visible light source and irradiates ultraviolet light, and a grip handle that can be attached to the shadowless lamp body, the shadowless lamp body has a handle attachment detection sensor that detects whether the grip handle is attached, and the control device turns on the germicidal light source of the shadowless lamp when the seating sensor has not detected that the patient is sitting and when the handle attachment detection sensor has not detected that the grip handle is attached, thereby solving the above-mentioned problem.

[0008] The invention according to claim 2 is the dental treatment unit according to claim 1, further comprising the shadowless lamp. detects that the visible light source of the shadowless lamp body is facing the dental treatment chair and that the sterilizing light source of the shadowless lamp body is facing the dental treatment chair. The above-mentioned problem is further solved by having a posture detection sensor, multiple grip handles attached to the shadowless lamp body, and the control device turning on the sterilizing light source of the shadowless lamp when the handle attachment detection sensor has not detected the attachment of all of the grip handles and the sterilizing light source of the shadowless lamp is facing the dental treatment chair.

[0009] The invention according to claim 3 is, in addition to the configuration of the dental treatment unit according to claim 1 or claim 2, characterized in that the shadowless lamp body has a human body detection sensor that detects a human body, and the control device is configured to detect when the handle attachment detection sensor detects that the grip handle is attached. When the human body detection sensor detects a human body, the visible light source of the shadowless lamp is turned on, and when the human body detection sensor does not detect a human body, the visible light source of the shadowless lamp is turned off. This further solves the above-mentioned problems. [Effects of the Invention]

[0010] According to the dental treatment unit of the invention of claim 1, the control device turns on the sterilizing light source of the shadowless lamp when the seating sensor does not detect that the patient is seated, thereby preventing the patient from being accidentally exposed to ultraviolet light of a strength sufficient to sterilize during treatment.Furthermore, when the handle attachment detection sensor does not detect that the grip handle is attached, i.e., when the grip handle is detached from the shadowless lamp body, the control device turns on the sterilizing light source of the shadowless lamp, so that ultraviolet light is only emitted after treatment when it is difficult to grasp the shadowless lamp body, i.e., when the patient cannot be seated in the dental treatment chair to perform dental treatment.This reliably prevents the human body from being accidentally exposed to ultraviolet light of a strength sufficient to sterilize.

[0011] According to the dental treatment unit of the invention of claim 2, in addition to the effects achieved by the dental treatment unit of the invention of claim 1, when the handle attachment detection sensor has not detected that all of the grip handles are attached, that is, when all of the grip handles have been removed from the shadowless lamp body and the shadowless lamp's sterilizing light source is facing the dental treatment chair, the control device turns on the shadowless lamp's sterilizing light source, and ultraviolet light is irradiated onto the dental treatment chair and floor only after treatment when dental treatment cannot be performed.This makes it possible to sterilize the dental treatment chair and floor while reliably preventing the sterilizing light source from being irradiated towards the human body by mistake.

[0012] According to the dental treatment unit of the invention of claim 3, in addition to the effects achieved by the dental treatment unit of the invention of claim 1 or claim 2, the control device: When a human body is detected by the human body detection sensor, the visible light source of the operating light is turned on, and when a human body is not detected by the human body detection sensor, the visible light source of the operating light is turned off. This means that the detection results of the gripping handle by the handle attachment detection sensor are used not only to turn on the sterilizing light source but also to turn on or off the visible light source, preventing the visible light source from being turned on by mistake after treatment. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a perspective view of a dental treatment unit according to an embodiment of the present invention; [Figure 2] FIG. 2 is a rear perspective view of the shadowless lamp shown in FIG. 1. [Figure 3] FIG. 2 is a front view of the shadowless lamp shown in FIG. 1. [Figure 4] IV-IV cross section of Figure 3. [Figure 5] VV cross-sectional view of Figure 3 showing the treatment posture. [Figure 6] VI-VI cross section of Figure 3 of the shadowless lamp showing the sterilization position. [Figure 7] FIG. 2 is a diagram showing an operational flow for turning on the germicidal light source of the shadowless lamp shown in FIG. 1. [Figure 8] FIG. 2 is a diagram showing an operational flow for turning on the visible light source of the shadowless lamp shown in FIG. 1. DETAILED DESCRIPTION OF THE INVENTION

[0014] The present invention provides a dental treatment unit comprising a dental treatment chair in which a patient sits, a shadowless lamp that shines light toward the dental treatment chair, and a control device that controls the on and off of the shadowless lamp, wherein the dental treatment chair has a seating sensor that detects whether the patient is sitting, the shadowless lamp has a shadowless lamp body that is provided with a visible light source that illuminates the patient's oral cavity and a germicidal light source that is positioned on the opposite side of the visible light source and emits ultraviolet light, and a grip handle that can be attached to the shadowless lamp body, the shadowless lamp body has a handle attachment detection sensor that detects whether the grip handle is attached, and the control device turns on the germicidal light source of the shadowless lamp when the seating sensor does not detect whether the patient is sitting and the handle attachment detection sensor does not detect that the grip handle is attached, so long as the control device reliably prevents the human body from being accidentally exposed to ultraviolet light of a strength sufficient for sterilization. [Example]

[0015] A dental treatment unit 100 according to one embodiment of the present invention will now be described with reference to FIGS.

[0016] <1. Overview of the dental treatment unit> First, an overview of a dental treatment unit 100 according to an embodiment of the present invention will be described based on FIG. 1, which is a perspective view of the dental treatment unit according to an embodiment of the present invention.

[0017] As shown in FIG. 1, the dental treatment unit 100 includes a dental treatment chair 110 on which a patient sits, a spitting receptacle 120 disposed adjacent to a side of the dental treatment unit 100, a work table 130 and a shadowless lamp 140 attached to the cuspidor 120, and a controller 150 for controlling the operations of these devices.

[0018] As shown in Figure 1, the dental treatment chair 110 has a base 111 that is placed on the floor F, a lifting section 112 that is provided on the top of the base 111 and can be raised and lowered freely, and a seat section 113 that is provided on the top of the lifting section 112. As shown in FIG. 1, the seat section 113 has a contoured seat 113a that is arranged approximately horizontally with respect to the floor F and supports the patient's buttocks, a backrest 113b that is provided behind the contoured seat 113a and supports the patient's back, a headrest 113c that is provided above the backrest 113b and supports the patient's head, an armrest 113d that is provided on the side of the contoured seat 113a and supports the patient's arms, a legrest 113e that is provided in front of the contoured seat 113a and supports the patient's legs, and a footrest 113f that is provided below the legrest 113e and supports the patient's feet.

[0019] As shown in FIG. 1, the seat portion 113 further includes a seating sensor 113g inside the contoured seat 113a for detecting whether a patient is seated. The seating sensor 113g is "ON" when the patient is seated, and is "OFF" when the patient is not seated.

[0020] The spitting receptacle 120 supplies water necessary for a patient to gargle, etc., and is driven by power from a commercial power source supplied to the dental treatment unit 100. In addition, the spitting receptacle 120 includes a spitting receptacle body 121 incorporating a power source and a water supply source, a water supply device 122 provided on the upper part of the spitting receptacle body 121, a basin 123 for receiving water used by a patient to gargle, and a support rod 124 provided on the upper part of the spitting receptacle body 121 and extending vertically.

[0021] The work table 130 is attached to a work table arm 124a attached to the support 124, and holds various dental instruments. As an example, the control device 150 is incorporated into the work table 130 as shown in FIG.

[0022] <2.Surgical light> Next, the shadowless lamp 140 will be described with reference to FIGS. 2 is a rear perspective view of the shadowless lamp shown in FIG. 1, FIG. 3 is a front view of the shadowless lamp shown in FIG. 1, FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3, FIG. 5 is a cross-sectional view taken along line VV in FIG. 3 showing the treatment posture, and FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 3 of the shadowless lamp showing the sterilization posture.

[0023] The shadowless lamp 140 emits light toward the dental treatment chair 110, and its blinking is controlled by the control device 150. As shown in Figure 2, this shadowless lamp 140 is composed of a shadowless lamp body 141, a gripping handle 142 that can be attached to the shadowless lamp body 141, and a connecting member 143 that connects the shadowless lamp arm 124b attached to the support 124 to the shadowless lamp body 141.

[0024] <2.1. Operating light body> As shown in Figures 2 and 3, shadowless lamp body 141 is a rectangular parallelepiped member and includes visible light source 141A that emits visible light to illuminate the inside of the oral cavity of a patient seated in dental treatment chair 110, visible light source cover 141B that covers visible light source 141A, sterilizing light source 141C that emits light rays in a wavelength range that has sterilizing power to kill bacteria and viruses (sterilizing rays), and sterilizing light source cover 141D that covers sterilizing light source 141C.

[0025] Visible light source 141A is an LED or a light bulb that emits visible light, and visible light source cover 141B is formed of a member that can transmit the light emitted from visible light source 141A. Germicidal light source 141C emits sterilizing light (ultraviolet light with a wavelength of around 260 nm) such as a fluorescent lamp or LED without a fluorescent substance coated on the inside of the glass tube, and sterilizing light source cover 141D is formed of a material (for example, quartz glass or metal mesh) that can transmit the light emitted from sterilizing light source 141C.

[0026] As is clear from Figures 2, 3 and 5, visible light source 141A and visible light source cover 141B, and germicidal light source 141C and germicidal light source cover 141D are arranged on either side of connecting shaft 141a which extends from both sides of shadowless lamp body 141 and connects to connecting member 143. Therefore, germicidal light source 141C is located opposite visible light source 141A. Hereinafter, for convenience, the side on which visible light source cover 141B is provided will be referred to as the "front" and the side on which sterilizing light source cover 141D is provided will be referred to as the "rear".

[0027] Furthermore, as shown in FIG. 4 and other figures, the shadowless lamp body 141 is formed with a handle attachment base 141b that protrudes forward from the connecting shaft 141a. The handle attachment base 141b is provided with a handle attachment detection sensor 141c that detects the attachment of the grip handle 142 as shown in FIG. 4, and a human body detection sensor 141d as shown in FIG.

[0028] The handle attachment detection sensor 141c is a microswitch having a leaf spring 141c1, and when no weight is applied to this leaf spring 141c1, it is in the "off state", and when the leaf spring 141c1 is pressed down, it is in the "on state". As shown in FIG. 4, in this embodiment, the leaf spring 141c1 bends in the direction in which the connecting shaft 141a extends. Hereinafter, the direction in which the leaf spring 141c1 is pressed down will be referred to as the "inner side," and the direction in which the leaf spring 141c1 bounces up will be referred to as the "outer side."

[0029] Human body detection sensor 141d is a non-contact sensor that detects a human body (for example, the hand or arm of a dentist, dental hygienist, or dental assistant). As shown in FIG. 1, the human body detection sensor 141d is exposed to the inside. That is, as shown in FIG. 4, a human body detection region R of the human body detection sensor 141d provided on one handle attachment base 141b is formed toward the other handle attachment base 141b.

[0030] <2.2.Grip handle> The grip handles 142 are attached to the handle attachment bases 141b of the shadowless lamp body 141, respectively. That is, a plurality of grip handles 142 (two in this embodiment) are attached to the shadowless lamp body 141. As shown in FIG. 2, the grip handle 142 is L-shaped. 1 and 5, windows 142a are formed on both side surfaces of the grip handle 142 to expose the human body detection sensor 141d of the shadowless lamp body 141.

[0031] <2.3. Connecting parts> The connecting member 143 is a U-shaped member as shown in FIG. 2, and as shown in FIGS. 4 and 5, has a posture detection sensor 143a that detects the posture of the shadowless lamp body 141, an annular ring 143b that abuts against this posture detection sensor 143a, and a retaining ring 143c that prevents this ring 143b from falling off.

[0032] The attitude detection sensor 143a is a microswitch having a leaf spring 143a1. As shown in FIG. 5, this leaf spring 143a1 bends in a direction perpendicular to the direction in which the connecting shaft 141a extends.

[0033] As shown in FIGS. 4 and 5, the ring 143b has the connecting shaft 141a of the shadowless lamp body 141 inserted therein and is positioned in the circumferential direction relative to the connecting shaft 141a. Furthermore, a recess 143b1 recessed in the radial direction is formed on the front side of the ring 143b. Therefore, when the leaf spring 143a1 of the posture detection sensor 143a is pressed down by contacting with the ring 143b as shown in FIG. 5, the visible light source 141A faces the dental treatment chair 110, which is the "treatment posture." Furthermore, when no weight is applied to the leaf spring 143a1 of the posture detection sensor 143a as shown in FIG. 6, the sterilizing light source 141C faces the dental treatment chair 110, which is the "sterilizing posture."

[0034] The retaining ring 143c is inserted onto the connecting shaft 141a of the shadowless lamp body 141 to determine the position of the ring 143b in the axial direction (the direction in which the connecting shaft 141a extends).

[0035] <3. Operation related to turning on the shadowless lamp> Next, an example of the operation of lighting the shadowless lamp 140 will be described with reference to FIGS. FIG. 7 is a diagram showing the operational flow of turning on the germicidal light source of the shadowless lamp shown in FIG. 1, and FIG. 8 is a diagram showing the operational flow of turning on the visible light source of the shadowless lamp shown in FIG.

[0036] <3.1. Operation related to lighting of the germicidal light source> First, an example of the operation of turning on the germicidal light source 141C of the shadowless lamp 140 will be described with reference to FIG.

[0037] (Step S10) The control device 150 of the dental treatment unit 100 first determines whether the dental treatment unit 100 is in the maintenance mode. If the dental treatment unit 100 is in the maintenance mode, the process proceeds to step S11. If dental treatment unit 100 is not in the maintenance mode, the process continues to determine whether dental treatment unit 100 is in the maintenance mode.

[0038] The "maintenance mode" here refers to a mode for performing maintenance on the dental treatment unit 100, and is, for example, a mode for draining water from the dental treatment unit 100 before a consultation. Furthermore, the dental treatment unit 100 can be put into the maintenance mode by operating the work table 130 or by remote control.

[0039] (Step S11) In step S11, the control device 150 determines whether the seating sensor 113g is OFF (i.e., a patient is not seated in the dental treatment chair 110) or ON (i.e., a patient is seated in the dental treatment chair 110). If the seating sensor 113g is OFF, it is determined that no patient is seated in the dental treatment chair 110, and the process proceeds to step S12. If the seating sensor 113g is ON, the determination as to whether the seating sensor 113g is ON or not continues.

[0040] (Step S12) In step S12, the control device 150 determines whether or not all the handle attachment detection sensors 141c are turned off (that is, whether or not all the grip handles 142 have been removed from the shadowless lamp body 141). If even one of the handle attachment detection sensors 141c is ON, it means that at least one grip handle 142 is attached to the shadowless lamp body 141, and the process returns to step S11. If all of the handle attachment detection sensors 141c are OFF, it is determined that all of the grip handles 142 have been removed from the shadowless lamp body 141 and the treatment has ended (i.e., there is no patient in the treatment room), and the process proceeds to step S13.

[0041] (Step S13) In step S13, control device 150 determines whether or not there is an instruction to turn on sterilizing light source 141C. If there is an instruction to turn on sterilizing light source 141C, the process proceeds to step S14. If there is no instruction to turn on sterilizing light source 141C, the determination of whether there is an instruction to turn on sterilizing light source 141C continues. The instruction to turn on sterilizing light source 141C may be given from work table 130 or remotely.

[0042] (Step S14) In step S14, it is determined whether the shadowless lamp body 141 is in the sterilization position. If the position of shadowless lamp body 141 is the sterilizing position (that is, if leaf spring 143a1 of position detection sensor 143a is fitted in recess 143b1 of ring 143b), sterilizing light source 141C is turned on for a predetermined time (step S15). If the position of the shadowless lamp body 141 is not the sterilization position, that is, if the position of the shadowless lamp body 141 is the medical treatment position (in other words, if the leaf spring 143a1 of the position detection sensor 143a is in contact with the ring 143b), the determination of whether the position of the shadowless lamp body 141 is in the sterilization position continues.

[0043] As described above, in the dental treatment unit 100 of this embodiment, the control device 150 turns on the sterilizing light source 141C of the shadowless lamp 140 for a predetermined time when "the seating sensor 113g of the dental treatment chair 110 has not detected that a patient is seated," "the handle attachment detection sensor 141c has not detected that all of the grip handles 142 have been attached, i.e., all of the grip handles 142 have been removed from the shadowless lamp body 141," and "the sterilizing light source 141C of the shadowless lamp 140 is facing the dental treatment chair 110 (i.e., the sterilizing position)."

[0044] <3.2. Visible light source lighting operation> Next, an example of the operation of lighting the visible light source 141A of the shadowless lamp 140 will be described with reference to FIG.

[0045] (Step S20) The control device 150 of the dental treatment unit 100 first determines whether or not all of the handle attachment detection sensors 141c are ON (that is, whether or not all of the grip handles 142 are attached to the shadowless lamp body 141). If all of the handle attachment detection sensors 141c are ON, it is determined that all of the grip handles 142 are attached to the shadowless lamp body 141, and the process proceeds to step S21. If all the handle attachment detection sensors 141c are not ON, the determination as to whether all the handle attachment detection sensors 141c are ON continues.

[0046] (Step S21) In step S21, it is determined whether the shadowless lamp body 141 is in the treatment position. If the posture of the shadowless lamp body 141 is the medical treatment posture (that is, if the leaf spring 143a1 of the posture detection sensor 143a is in contact with the ring 143b), the process proceeds to step S22. If the position of the shadowless lamp body 141 is not the medical treatment position, that is, if the position of the shadowless lamp body 141 is the sterilization position, the determination of whether the position of the shadowless lamp body 141 is the medical treatment position continues.

[0047] (Step S22) In step S22, the control device 150 determines whether any one of the human body detection sensors 141d has detected a human body. If any one of the human body detection sensors 141d detects a human body, the visible light source 141A is turned on (step S23). If none of the human body detection sensors 141d detects a human body, the determination of whether any one of the human body detection sensors 141d has detected a human body continues.

[0048] As described above, the control device 150 of the dental treatment unit 100 of this embodiment turns on the visible light source 141A of the shadowless lamp 140 in response to the detection of a human body by the human body detection sensor 141d only when the handle attachment detection sensor 141c detects the attachment of the grip handles 142, i.e., when all of the grip handles 142 are attached to the shadowless lamp body 141. The same applies to turning off the visible light source 141A; that is, the control device 150 turns off the visible light source 141A of the shadowless lamp 140 in response to the detection of a human body by the human body detection sensor 141d, only when all of the grip handles 142 are attached to the shadowless lamp body 141.

[0049] <4. Effects of the Dental Treatment Unit 100> According to dental treatment unit 100 of this embodiment as described above, when seating sensor 113g does not detect that a patient is seated, control device 150 turns on sterilizing light source 141C of shadowless lamp 140, thereby preventing the patient from being accidentally exposed to ultraviolet light of a strength sufficient for sterilization during treatment. Furthermore, when handle attachment detection sensor 141c does not detect that grip handle 142 is attached, that is, when grip handle 142 is detached from shadowless lamp main body 141, control device 150 turns on sterilizing light source 140C of shadowless lamp 140, thereby irradiating ultraviolet light only after treatment when it is difficult to grasp shadowless lamp main body 141, that is, when the patient is seated in dental treatment chair 110 and dental treatment cannot be performed. This reliably prevents the human body from being accidentally exposed to ultraviolet light of a strength sufficient for sterilization.

[0050] Furthermore, the control device 150 turns on or off the visible light source 141A of the shadowless lamp 140 in response to the detection of a human body by the human body detection sensor only when the handle attachment detection sensor 141c detects that the grip handle 142 is attached, that is, only when the grip handle 142 is attached to the shadowless lamp body 141. This means that the detection result of the grip handle 142 by the handle attachment detection sensor 141c is used not only to turn on the sterilizing light source 141C but also to turn on or off the visible light source 141A, thereby preventing the visible light source 141A from being turned on by mistake after treatment.

[0051] <Modification> Although the dental treatment unit 100 according to one embodiment of the present invention has been described above, the dental treatment unit of the present invention is not limited to the dental treatment unit 100 according to the above-described embodiment.

[0052] For example, if the control device can turn on the sterilizing light source of the shadowless lamp when the seating sensor does not detect that the patient is seated and the handle attachment detection sensor does not detect that the grip handle is attached, the operational flow for turning on the sterilizing light source of the shadowless lamp is not limited to the operational flow described above.

[0053] For example, an audible alarm may sound when the germicidal light source is on to indicate this. [Explanation of symbols]

[0054] 100 Dental Treatment Units 110 ··· Dental treatment chair 111 ... base 112 Lifting section 113 Seat section 113a ··· Contour sheet 113b Backrest 113c ··· Headrest 113d ··· Armrest 113e Leg rest 113f ··· Footrest 113g ··· Seat sensor 120 Cuspidor 121 Cuspidor body 122... Water supply equipment 123 ··· Pot 124 ··· Pillar 124a ··· Work table arm 124b ··· Operating light arm 130 ··· Work table 140 ... operating light 141... Operating light body 141A... Visible light source 141B Visible light source cover 141C... Sterilizing light source 141D Sterilization light source cover 141a...Connection shaft 141b Handle mounting base 141c Handle attachment detection sensor 143c1 ··· Leaf spring 141d ··· Human body detection sensor 142 ··· Grip handle 142a Window 143 Connecting member 143a ··· Attitude detection sensor 143a1 ··· Leaf spring 143b ··· Ring 143b1 ··· Recess 143c ··· Retaining ring 150 Control device F...floor R Human body detection area

Claims

1. A dental treatment unit comprising a dental treatment chair in which a patient sits, a shadowless lamp that irradiates light toward the dental treatment chair, and a control device that controls the flashing of the shadowless lamp, the dental treatment chair has a seating sensor that detects whether the patient is sitting on it, The shadowless lamp has a shadowless lamp body provided with a visible light source that illuminates the oral cavity of the patient and a germicidal light source that is disposed on the opposite side of the visible light source and irradiates ultraviolet light, and a grip that can be attached to the shadowless lamp body, The shadowless lamp body has a handle attachment detection sensor that detects attachment of the grip handle, A dental treatment unit characterized in that the control device turns on the sterilizing light source of the shadowless lamp when the seating sensor does not detect that the patient is seated and the handle attachment detection sensor does not detect that the grip handle is attached.

2. the shadowless lamp has a posture detection sensor that detects that a visible light source of the shadowless lamp body is facing the dental treatment chair and that a germicidal light source of the shadowless lamp body is facing the dental treatment chair, A plurality of grip handles are attached to the shadowless lamp body, The dental treatment unit according to claim 1, characterized in that the control device turns on the sterilizing light source of the operating lamp when the handle attachment detection sensor does not detect the attachment of all of the grip handles and when the sterilizing light source of the operating lamp is facing the dental treatment chair.

3. The shadowless lamp body has a human body detection sensor that detects a human body, The dental treatment unit described in claim 1 or claim 2, characterized in that the control device turns on the visible light source of the shadowless lamp when the human body detection sensor detects a human body while the handle attachment detection sensor detects the attachment of the grip handle, and turns off the visible light source of the shadowless lamp when the human body detection sensor does not detect a human body.

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