Please select the most similar patent number from A, B, C and D. Which number is?
An indicator (10, 60) and a dental instrument (100) having the indicator (10, 60), the indicator (10, 60) being used for the dental instrument (100). In one embodiment, the indicator (10) comprises a first indicator (20) and a second indicator (30) which are stacked, the first indicator (20) comprising a first pattern layer (21), and the second indicator (30) comprising a second pattern layer (31). An active substance in the oral cavity sequentially permeates through the first indicator (20) and the second indicator (30), and with the permeation of the active substance in the oral cavity, the first pattern layer (21) and the second pattern layer (31) sequentially display patterns. In another embodiment, the indicator (10) comprises an adsorption layer (11) and a display layer (12), and when the adsorption layer (11) adsorbs an active substance in the oral cavity and reaches a saturated state, the active substance permeates through the adsorption layer (11) and into the display layer (12), and the active substance acts on the display layer (12) to display a pattern. In yet another embodiment, the indicator (60) comprises a pattern layer (61) and a scale (70), the pattern layer (61) forming a change region (L) under the action of an active substance in the oral cavity, and the scale (70) being used for indicating position information of the change region (L). The dental instrument (100) having the indicator (10, 60) can optimize the indication effect and improve wearing compliance.
A: A virtual environment picture display method and apparatus, and a device and a storage medium. The method comprises: displaying a first virtual environment picture (60), wherein the first virtual environment picture (60) comprises a first region obtained by observing a virtual environment with a first observation position serving as an observation center, and the first virtual environment picture (60) displays a main control virtual character (61) located in the virtual environment; in response to receiving an aiming operation, displaying a regional skill indicator (65) for selecting a target region, wherein the regional skill indicator (65) is used for identifying the target region in the virtual environment, and the target region is a skill actioning region when the main control virtual character (61) releases a skill; and displaying a second virtual environment picture, wherein the second virtual environment picture comprises a second region obtained by observing the virtual environment with a second observation position serving as an observation center, the second observation position is a position that is deviated relative to the first observation position, and the second region comprises the target region. The accuracy of target aiming is improved.
B: A dental instrument for adjusting the maxillomandibular relationship, comprising a first housing-like body (10) for accommodating maxillary teeth and a second housing-like body (20) for accommodating mandibular teeth. The buccal side surface of a posterior teeth region of the first housing-like body (10) is provided with a protrusion (11) protruding toward the opposite jaw for adjusting the maxillomandibular relationship; the protrusion (11) comprises an acting end, and the acting end at least partially covers the buccal side surface of the second housing-like body (20) when the first housing-like body (10) and the second housing-like body (20) act stably; a limit portion (21) protruding toward the buccal side is provided along the buccal side surface of the second housing-like body (20); a mesial surface (111) of the protrusion (11) interacts with a distal surface (212) of the limit portion (21) to adjust the maxillomandibular relationship. When the first housing-like body (10) and the second housing-like body (20) act stably, the mesial surface (111) of the acting end forms surface contact with the distal surface (212) of the limit portion (21), the surface contact has a large action area and strong action force, and thus, the maxillomandibular relationship is effectively adjusted to tend to be normal.
C: A knee joint soft tissue balance measurement device and a measurement method thereof. The measurement device comprises: a datum plate (10), a movable plate (20), a base body (30), an actuator (40), a gap indicator (50), an extorsion indicator (60) and a load indicator (70), wherein the datum plate (10) is fixedly connected to the base body (30); the movable plate (20) is rotatably connected to the actuator (40); the gap indicator (50) is connected with the actuator (40); the extorsion indicator (60) is connected with the movable plate (20); the load indicator (70) is connected with the actuator (40); and the actuator (40) is disposed on the base body (30). With the measurement device and the measurement method thereof, comprehensive measurements for a straightening gap, a knee-bending gap, a physiological extorsional angle of femur and the magnitude of an applied load can be carried out at the same time, and prior to the formation of the knee-bending gap, a prejudgment can be produced on the basis of the measured parameters and the original balance condition of soft tissues to determine the knee-bending gap consistent with physiological features, thus attaining the anticipated soft tissue balance.
D: An accelerator optical distance indicator apparatus, a calibration method, and an optical distance indicator generation method, relating to the technical field of medical appliances. The accelerator optical distance indicator apparatus comprises a projector (101), a camera (102), an optical distance indicator calibration plate (103), and an optical distance indicator (104); the projector (101) is configured to project a structured light mode sequence pattern and an optical distance indicator pattern; the camera (102) is configured to collect the structured light mode sequence pattern projected by the projector (101) and an image of the optical distance indicator calibration plate (103); the optical distance indicator calibration plate (103) is configured to calibrate the projector (101) and the camera (102) and verify precision of the optical distance indicator apparatus; the optical distance indicator (104) is configured to indicate a scale of the optical distance indicator apparatus. The accelerator optical distance indicator apparatus may calibrate the camera (102) and the projector (101) by means of structured light to obtain calibration parameters, and may also further generate the optical distance indicator pattern using the obtained calibration parameters. The accelerator optical distance indicator apparatus is convenient to mount, the calibration accuracy of the calibration method is high, and the calibration process of the optical distance indicator apparatus is simplified.
Answer: B