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CN-122005137-A - Thin film sensor detection device for tooth adjacent surface contact area

CN122005137ACN 122005137 ACN122005137 ACN 122005137ACN-122005137-A

Abstract

The invention belongs to the technical field of detection of tooth adjacent surface contact areas, and particularly discloses a thin film sensor detection device of a tooth adjacent surface contact area, which comprises a thin film pressure sensor module, a data acquisition module, a signal processing module, a display module and a data storage and transmission module, wherein the thin film pressure sensor module is connected with the data acquisition module, and the signal processing module is respectively connected with the data acquisition module, the display module and the data storage and transmission module; the film pressure sensor module is an array structure composed of a plurality of sub-sensors, each sub-sensor is provided with a unique position code and is used for collecting pressure signals of adjacent surface contact areas of teeth and outputting resistance change signals with position information. The invention solves the problems that the existing sensor array cannot form a high-precision morphological profile, cannot be spliced into a continuously measurable contact form and cannot output morphological parameters of a tooth adjacent surface contact area, and is difficult to meet the requirements of orthodontics, repair and the like on accurate design of the adjacent surface contact form.

Inventors

  • HU WEI
  • Jin Zhenning
  • ZHAO BIN

Assignees

  • 中国人民解放军总医院第一医学中心

Dates

Publication Date
20260512
Application Date
20260326

Claims (10)

  1. 1. The thin film sensor detection device for the tooth adjacent surface contact area is characterized by comprising a thin film pressure sensor module (1), a data acquisition module (2), a signal processing module (3), a display module (4), a data storage and transmission module (5) and a power supply module (6), wherein the thin film pressure sensor module (1) is connected with the data acquisition module (2), the signal processing module (3) is respectively connected with the data acquisition module (2), the display module (4) and the data storage and transmission module (5), and the power supply module (6) is connected with the thin film pressure sensor module (1), the data acquisition module (2), the signal processing module (3), the display module (4) and the data storage and transmission module (5); the film pressure sensor module (1) is of an array structure composed of a plurality of sub-sensors, each sub-sensor is provided with a unique position code and is used for collecting pressure signals of adjacent surface contact areas of teeth and outputting resistance change signals with position information; The data acquisition module (2) is used for acquiring resistance change signals of all the sub-sensors; the signal processing module (3) is used for converting the resistance change signal into a pressure value, calculating the area and morphological parameters of the contact area based on the position code and generating a two-dimensional morphological contour of the tooth adjacent surface contact area; the display module (4) is used for visually displaying the two-dimensional morphological outline and morphological parameters; The data storage and transmission module (5) is used for storing the history detection data and transmitting the data to the external terminal equipment; and the power supply module (6) is used for supplying power to all the modules.
  2. 2. The thin film sensor detection apparatus of the tooth proximity surface contact area according to claim 1, wherein the thin film pressure sensor module (1) has a square structure of 1cm×1cm, 400 sub-sensors are arranged in a 20×20 array, and the center-to-center distance of adjacent sub-sensors is 0.5mm.
  3. 3. The device for detecting the thin film sensor in the contact area of the adjacent surface of the tooth according to claim 1, wherein each sub-sensor is of a three-layer composite structure, the upper layer and the lower layer are respectively a polyethylene terephthalate PET sheet with the thickness of 0.008mm, and the middle layer is a high-temperature-resistant carbon slurry layer with the thickness of 0.008 mm.
  4. 4. A device for detecting a thin film sensor in a contact area of a tooth surface according to claim 3, wherein the resistance of the high temperature resistant carbon paste layer changes with the pressure applied by the sub-sensor, the high temperature resistant carbon paste layer is surrounded by silver conductors, and the silver conductors are connected with lead-out electrodes for transmitting resistance change signals to the data acquisition module (2).
  5. 5. The thin film sensor detection apparatus for tooth abutment surface contact area according to claim 3, wherein the calculation formula of the pressure value is: Wherein, the Represent the first The pressure value of the sub-sensor, The sensitivity coefficient is represented by a value representing the sensitivity, The amount of change in the resistance is indicated, Indicating the zero pressure offset.
  6. 6. The thin film sensor detection device for a tooth surface contact area according to claim 1, wherein the method for generating the two-dimensional morphological outline of the tooth surface contact area by calculating the area and morphological parameters of the contact area based on the position code specifically comprises the following steps: Calculating the center coordinates of each sub-sensor in a preset coordinate system according to the position codes of each sub-sensor; marking a central coordinate corresponding to a sub-sensor with a pressure value larger than or equal to a preset threshold value as an effective contact point to form an effective point set; denoising the effective point set, removing abnormal points with the distance from the average point being more than 2 times of standard deviation, and obtaining a cleaned point set; performing boundary extraction on the cleaned point set by adopting a convex hull algorithm to obtain a boundary point set; And calculating the contact area and the morphological parameters based on the boundary point set, and completing the two-dimensional morphological contour reconstruction of the tooth adjacent surface contact area.
  7. 7. The device for detecting a thin film sensor in a tooth surface contact area according to claim 6, wherein the method for removing abnormal points with a distance of more than 2 times of standard deviation from a mean point by denoising the effective point set comprises the following steps: Calculating the mean coordinates of the active point set : Wherein, the Representing the total number of active contact points, Represent the first The abscissa of the effective contact point, Represent the first The ordinate of the effective contact points; calculating Euclidean distance from each effective contact point to mean coordinate : And removing points with the distance being more than 2 times of standard deviation to obtain a cleaned point set.
  8. 8. The device for detecting the thin film sensor in the contact area of the adjacent surface of the tooth according to claim 6, wherein the method for extracting the boundary of the cleaned point set by adopting the convex hull algorithm comprises the following steps: the cleaned point sets are arranged in ascending order according to the abscissa; sequentially calculating the vector cross products among the three points according to the arrangement, if the vector cross products are smaller than or equal to 0, eliminating the points positioned at the inner sides among the three points, if the vector cross products are larger than 0, reserving the points, and traversing the ordered points in the forward direction to finish the construction of the lower convex hull; Reversely traversing the ordered points, calculating a vector cross product, and constructing an upper convex hull; And removing repeated endpoints of the lower convex shell and the upper convex shell, and combining the upper convex shell and the lower convex shell to obtain a complete contact area boundary point set.
  9. 9. The device for detecting tooth proximity contact area of claim 8, wherein the contact area is The calculation formula of (2) is as follows: Wherein, the Indicating contact area number The abscissa of the individual boundary points, Indicating contact area number The ordinate of the individual boundary points, Indicating contact area number The abscissa of the individual boundary points, Indicating contact area number The ordinate of the individual boundary points.
  10. 10. The thin film sensor inspection device of tooth abutment surface contact areas according to claim 1, wherein the morphological parameters include major axis, minor axis, eccentricity and center coordinates.

Description

Thin film sensor detection device for tooth adjacent surface contact area Technical Field The invention belongs to the technical field of detection of tooth adjacent surface contact areas, and particularly relates to a thin film sensor detection device for a tooth adjacent surface contact area. Background Normal tooth abutment is critical to oral health. The shape, the tightness, the contact area and the stress distribution of the contact area of the adjacent surfaces of the teeth are important indexes for orthodontic treatment, restoration, occlusion reconstruction and periodontal health assessment. Parameters such as tightness, position, shape, area and the like are common indexes for quantitatively evaluating the adjacent surface contact area. At present, the clinical practice mainly aims at qualitatively evaluating the tightness. Dental floss is the most commonly used method of clinical assessment of abutment tightness. The method is considered to be relatively subjective, poor in stability, unable to quantify, and too complex in quantitative equipment, and limited in intraoral application. Sheet metal is another method of clinical assessment of adjacency tightness. The method is controversial for defining the thickness of the metal sheet and cannot be accurately quantified. At present, pressure detection is mainly used for detecting the contact state of the adjacent surface of the tooth in clinic and scientific research, and two-dimensional or three-dimensional morphological contours of the contact area of the adjacent surface are difficult to directly and accurately obtain. The existing scheme of adopting a sensor to detect the stress of the contact area of the adjacent surface of the tooth has the core aim of obtaining the contact pressure of the whole area. The traditional sensor has the following defects that the density of a sensor array is insufficient, a high-precision morphological outline cannot be formed, an independent position coding and coordinate mapping mechanism is not available, only a pressure cloud image can be obtained, the pressure cloud image cannot be spliced into a continuous and measurable contact form, morphological parameters such as the shape, the boundary, the area, the length-width ratio, the contact point position and the like of a tooth adjacent surface contact area cannot be output, and the requirements of orthodontics, restoration and the like on accurate design of the adjacent surface contact form are difficult to meet. Disclosure of Invention The invention aims to solve the problems that the existing sensor array cannot form a high-precision morphological outline, cannot be spliced into a continuously measurable contact form and cannot output morphological parameters of a tooth adjacent surface contact area, and cannot meet the requirements of orthodontics, restoration and the like on accurate design of the adjacent surface contact form, and provides a thin film sensor detection device of the tooth adjacent surface contact area. The technical scheme of the invention is that the thin film sensor detection device for the tooth adjacent surface contact area comprises a thin film pressure sensor module, a data acquisition module, a signal processing module, a display module, a data storage and transmission module and a power module, wherein the thin film pressure sensor module is connected with the data acquisition module, the display module and the data storage and transmission module, the power module is connected with the thin film pressure sensor module, the data acquisition module, the signal processing module, the display module and the data storage and transmission module respectively; The film pressure sensor module is of an array structure formed by a plurality of sub-sensors, each sub-sensor is provided with a unique position code and is used for collecting pressure signals of adjacent surface contact areas of teeth and outputting resistance change signals with position information; The data acquisition module is used for acquiring resistance change signals of all the sub-sensors; The signal processing module is used for converting the resistance change signal into a pressure value, calculating the area and morphological parameters of the contact area based on the position code and generating a two-dimensional morphological contour of the tooth adjacent surface contact area; the display module is used for visually displaying the two-dimensional morphological outline and the morphological parameters; the data storage and transmission module is used for storing the history detection data and transmitting the data to the external terminal equipment; and the power supply module is used for supplying power to all the modules. Preferably, the film pressure sensor module has a square structure of 1cm×1cm, 400 sub-sensors are arranged in a 20×20 array, and the center-to-center spacing of adjacent sub-sensors is 0.5mm. Preferably, each sub-sensor is of a three-layer com