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CN-121987365-A - Method and device for determining relationship between teeth

CN121987365ACN 121987365 ACN121987365 ACN 121987365ACN-121987365-A

Abstract

The embodiment of the invention provides a method and a device for determining a tooth-tooth relationship, wherein the method and the device comprise the steps of obtaining a three-dimensional tooth digital model of a patient in at least one correction stage or from the patient, determining tooth characteristic information of at least one tooth according to the three-dimensional tooth digital model, determining a datum line of a first tooth and an auxiliary line corresponding to the datum line according to the tooth characteristic information of the first tooth, wherein the datum line and the auxiliary line form at least one dividing region, the first tooth is one tooth in the three-dimensional digital model, determining a tooth surface region corresponding to the same dividing region according to the datum line and the auxiliary line corresponding to the datum line, and determining the tooth relationship between the first tooth and other teeth in the tooth surface region according to the tooth characteristic information. The corresponding tooth surface area is determined from the tooth characteristic information through the accurate determination reference line and the auxiliary line, so that the tooth space relation can be accurately determined according to the tooth surface area.

Inventors

  • LI BAORUI
  • HE SHIJIU
  • YE CHANFENG

Assignees

  • 无锡时代天使生物科技有限公司

Dates

Publication Date
20260508
Application Date
20241107

Claims (19)

  1. 1. A method of determining relationships between teeth, comprising: acquiring a three-dimensional dental digital model of the patient during at least one stage of the correction or from a patient acquisition; Determining tooth characteristic information of at least one tooth according to the three-dimensional tooth digital model, wherein the tooth characteristic information is used for representing the spatial characteristics of the tooth; Determining a reference line of a first tooth and an auxiliary line corresponding to the reference line according to tooth characteristic information of the first tooth, wherein the reference line and the auxiliary line form at least one divided area; And determining a tooth surface area corresponding to the same dividing area from the tooth characteristic information according to the datum line and the auxiliary line corresponding to the datum line, wherein the tooth surface area is used for determining the tooth relationship between the first tooth and other teeth.
  2. 2. The method of claim 1, wherein determining dental data located in the same partitioned area from the dental feature information to obtain a dental surface area corresponding to the partitioned area, comprises at least one of: Determining tooth data positioned in a first screening boundary from the tooth characteristic information so as to obtain the occlusal surface of the tooth, wherein the first screening boundary comprises at least one of a tooth ridge line serving as a reference line and a bite line serving as an auxiliary line; Determining tooth data located in the second screening boundary from the tooth characteristic information to obtain front and rear tooth surfaces of the tooth, wherein the second screening boundary comprises at least one of a tooth ridge line, a root crown boundary line and a middle side line as auxiliary lines, wherein the tooth ridge line is used as a reference line; And determining tooth data positioned in a third screening boundary from the tooth characteristic information so as to obtain the medial side of the tooth, wherein the third screening boundary comprises at least one of a root crown boundary line serving as a reference line and a bite line and a medial side line serving as auxiliary lines.
  3. 3. The method of claim 2, wherein determining at least one reference line and an auxiliary line corresponding to the at least one reference line based on the tooth characteristic information comprises at least one of: Determining a tooth ridge line and a tooth root crown boundary line serving as a reference line according to the tooth characteristic information; and determining a bite line and a middle lateral line serving as auxiliary lines according to the tooth characteristic information and the datum line.
  4. 4. The method of claim 2, wherein the tooth ridge lines comprise lingual ridge lines and labial ridge lines, and wherein the bite lines comprise mesial and distal bite lines; the first screening boundary includes at least one of the lingual ridge, the labial ridge, the mesial bite line and the distal bite line.
  5. 5. The method of claim 4, wherein said determining a bite line as an auxiliary line based on said tooth characteristic information and said reference line comprises at least one of: Determining a mesial bite line with the distance between the first endpoint and the second endpoint meeting a first preset range from the tooth characteristic information according to a first endpoint of the labial ridge line at the first end and a second endpoint of the lingual ridge line at the first end; and determining a long-middle bite line with the distance between the third end point and the fourth end point meeting a second preset range from the tooth characteristic information according to the third end point of the labial ridge line at the second end and the fourth end point of the lingual ridge line at the second end.
  6. 6. The method of claim 2, wherein the tooth type of the first tooth is posterior, the reference line further comprises a mesial sulcus line, a mesial bite line comprises a mesial labial line, a mesial lingual line, and a distal bite line comprises a distal labial line and a distal lingual line; the first sub-screening boundary comprises at least one of the labial ridge line, the far labial line, the near labial line and the medial fossa line, and is used for determining a labial slope surface of the occlusal surface; The second sub-screening boundary comprises at least one of the lingual ridge line, the distal lingual line, the proximal lingual line and the medial fossa line, and is used for determining a lingual slope of the occlusal surface.
  7. 7. The method of claim 6, wherein the mesial lip line, the distal lip line, the mesial tongue line, and the distal tongue line are each determined by at least one of: According to the fifth endpoint of the medial fossa line at the first end, determining a near-medial labial line, wherein the distance between the fifth endpoint and the first endpoint meets a third preset range, from the tooth characteristic information; according to the fifth endpoint of the medial fossa line at the first end, determining a near-medial lingual line with the distance between the fifth endpoint and the second endpoint meeting a fourth preset range from the tooth characteristic information; according to the sixth endpoint of the second end of the medial fossa line, determining a far medial labial line, the distance between the sixth endpoint and the third endpoint of which meets a fifth preset range, from the tooth characteristic information; And determining a far-middle lingual line with the distance between the sixth end point and the fourth end point meeting a sixth preset range from the tooth characteristic information according to a sixth end point of the medial fossa line at the second end.
  8. 8. The method of claim 6, wherein the first tooth is a posterior tooth having a tooth number 6, 7, or 8, wherein the reference line further comprises a labial fossa line and a lingual fossa line, wherein the labial fossa line is positioned between the medial fossa line and the labial fossa line, wherein the lingual fossa line is positioned between the medial fossa line and the lingual fossa line, wherein the labial fossa line is divided into a mesial labial line and a distal labial line, wherein the medial fossa line is divided into a mesial labial fossa line and a distal labial fossa line based on the labial fossa line, wherein the lingual fossa line is divided into a mesial lingual fossa line and a distal lingual fossa line based on the lingual fossa line, wherein the labial slope comprises a mesial occlusal surface, a distal labial occlusal surface, wherein the lingual slope comprises at least one of: Determining a third sub-screening boundary comprising at least one of the mesial labial ridge line, the mesial labial line, the labial fossa line and the mesial labial fossa line, wherein the third sub-screening boundary is used for obtaining the mesial labial occlusal surface; determining a fourth sub-screening boundary comprising at least one of the far and intermediate labial ridge line, the far and intermediate labial fossa line, the labial fossa line, and the far and intermediate labial fossa line, the fourth sub-screening boundary being for obtaining the far and intermediate labial occlusal surface; determining a fifth sub-screening boundary comprising at least one of the mesial lingual ridge line, the mesial lingual line, the lingual fossa line, and the mesial lingual fossa line, the fifth sub-screening boundary being for obtaining the mesial lingual occlusal surface; and determining a sixth sub-screening boundary comprising at least one of the distal lingual ridge line, the distal lingual line, the lingual fossa line and the distal lingual fossa line, wherein the sixth sub-screening boundary is used for obtaining the distal lingual occlusal surface.
  9. 9. The method of claim 8, wherein the mesial labial ridge, the distal labial ridge, the mesial labial fossa line, the distal labial fossa line, the mesial lingual ridge, the distal lingual ridge, the mesial lingual fossa line, and the distal lingual fossa line are each determined by at least one of: dividing the labial ridgeline into a mesial labial ridgeline and a distal labial ridgeline according to the labial fossa line; dividing the medial fossa groove line into a proximal medial fossa groove line and a distal medial fossa groove line according to the labial fossa groove line; dividing the lingual ridge line into a mesial lingual ridge line and a distal lingual ridge line according to the lingual fossa line; according to the lingual fossa groove line, the medial fossa groove line is divided into a proximal lingual fossa groove line and a distal lingual fossa groove line.
  10. 10. The method of any one of claims 1 to 9, wherein the second tooth is a tooth in the three-dimensional digital model that has a correspondence with the first tooth, and wherein determining the relationship between the first tooth and the teeth of the other teeth comprises: acquiring the contact surface of the first tooth and the second tooth; acquiring a first contact area where the first tooth is in contact with the second tooth, and a second contact area where the second tooth is in contact with the first tooth; And determining the occlusion relation between the first teeth and the second teeth according to the first tooth surface area corresponding to the first contact area and the second tooth surface area corresponding to the second contact area.
  11. 11. The method of claim 10, wherein the first tooth is a maxillary tooth, the second tooth is a mandibular tooth corresponding to the first tooth, and the tooth types of the first tooth and the second tooth are posterior teeth; Determining an occlusion relationship of the first tooth and the second tooth according to a first tooth surface area corresponding to the first contact area and a second tooth surface area corresponding to the second contact area, including: If the first tooth surface area corresponding to the first contact area is the lingual slope or the lingual surface, the first contact area is located in a first lingual ridge setting area of the first tooth surface area, the second tooth surface area corresponding to the second contact area is the labial slope or the lingual slope, and the second contact area is located in a first fossa ridge setting area of the second tooth surface area, then the occlusion relationship between the first tooth and the second tooth is a normal occlusion relationship; The first lingual ridge line setting area is a partial area of the lingual slope surface, which is close to the lingual ridge line, or a partial area of the lingual side surface, which is close to the lingual ridge line, and the first fossa groove line setting area is a partial area of the labial slope surface, which is close to the fossa groove line, or a partial area of the lingual slope surface, which is close to the fossa groove line.
  12. 12. The method of claim 10, wherein determining the bite relationship of the first tooth with the second tooth based on the first facing region corresponding to the first contact region and the second facing region corresponding to the second contact region comprises: If the first tooth surface area corresponding to the first contact area is the lingual surface, the first contact area is located in a first fossa line setting area of the first tooth surface area, the second tooth surface area corresponding to the second contact area is the labial slope surface or the labial surface, the second contact area is located in a labial ridge line setting area of the second tooth surface area, the occlusion relationship between the first tooth and the second tooth is a normal occlusion relationship, the first fossa line setting area is a partial area of the labial slope surface, which is close to the fossa line, or a partial area of the lingual slope surface, which is close to the fossa line, and the labial ridge line setting area is a partial area of the labial slope surface, which is close to the labial ridge line, or a partial area of the labial side surface, which is close to the lingual line.
  13. 13. The method of claim 10, wherein determining the bite relationship of the first tooth with the second tooth from a first facing region corresponding to the first contact region and a second facing region corresponding to the second contact region comprises at least one of: If the first tooth surface region corresponding to the first contact region is the labial slope or the labial surface, the first contact region is located in a labial ridge setting region of the first tooth surface region, the second tooth surface region corresponding to the second contact region is the lingual slope or the lingual surface, and the second contact region is located in a first lingual ridge setting region of the second tooth surface region, the occlusion relationship between the first tooth and the second tooth is an abnormal occlusion relationship, the labial ridge setting region is a partial region of the labial slope near the labial ridge or a partial region of the labial surface near the lingual ridge, and the first lingual ridge setting region is a partial region of the lingual slope near the lingual ridge or a partial region of the lingual surface near the lingual ridge; If the first tooth surface area corresponding to the first contact area is the lingual slope or the lingual surface, the first contact area is located in a first lingual ridge setting area of the first tooth surface area, and the second tooth surface area corresponding to the second contact area is the labial surface, the occlusion relationship between the first tooth and the second tooth is an abnormal occlusion relationship; And if the first tooth surface area corresponding to the first contact area is the labial side surface and the second tooth surface area corresponding to the second contact area is the lingual side surface, the occlusion relationship between the first tooth and the second tooth is an abnormal occlusion relationship.
  14. 14. The method of claim 10, wherein the first tooth is a maxillary tooth, the second tooth is a mandibular tooth corresponding to the first tooth, the tooth types of the first tooth and the second tooth are posterior teeth, and the tooth number of the first tooth is 6, 7 or 8; Determining an occlusion relationship of the first tooth and the second tooth according to a first tooth surface area corresponding to the first contact area and a second tooth surface area corresponding to the second contact area, including: If the first tooth surface area corresponding to the first contact area is the mesial lingual occlusal surface, the distal lingual occlusal surface or the lingual surface, and the first contact area is located in a second lingual ridge setting area of the first tooth surface area, the second tooth surface area corresponding to the second contact area is the labial slope or the lingual slope, and the second contact area is located in a second fossa ridge setting area of the second tooth surface area, determining that the occlusal relationship between the first tooth and the second tooth is a normal occlusal relationship; The second lingual setting area is a partial area of the mesial lingual occlusal surface near the lingual ridge line, a partial area of the distal lingual occlusal surface near the lingual ridge line, or a partial area of the lingual surface near the lingual ridge line, and the second fossa line setting area is a partial area of the labial slope near the fossa line or a partial area of the lingual slope near the fossa line.
  15. 15. The method of claim 10, wherein the mesial side of the first tooth is adjacent the distal side of the second tooth, wherein for the adjacent first tooth and second tooth, the determining the relationship between the first tooth and the other teeth comprises at least one of: if a gap or an overlapping part exists between a first tooth surface area of the first tooth and a second tooth surface area of the second tooth, determining that the relationship between the teeth is abnormal; And if no gap exists between the first tooth surface area of the first tooth and the second tooth surface area of the second tooth, determining that the relationship between the teeth is normal.
  16. 16. An apparatus for determining relationships between teeth, comprising: the acquisition unit is used for acquiring a three-dimensional tooth digital model acquired by the patient in at least one correction stage or from the patient; The processing unit is used for determining tooth characteristic information of at least one tooth according to the three-dimensional tooth digital model, wherein the tooth characteristic information is used for representing the space characteristics of the tooth, determining a datum line of a first tooth and an auxiliary line corresponding to the datum line according to the tooth characteristic information of the first tooth, wherein the datum line and the auxiliary line form at least one dividing area, the first tooth is one tooth in the three-dimensional digital model, determining a tooth surface area corresponding to the same dividing area from the tooth characteristic information according to the datum line and the auxiliary line corresponding to the datum line, and the tooth surface area is used for determining the tooth relationship between the first tooth and other teeth.
  17. 17. A computer readable non-transitory storage medium comprising computer readable instructions which, when read and executed by a computer, cause the computer to perform the steps of the method of any of claims 1 to 15.
  18. 18. A computing device, comprising: A memory for storing a computer program; Processor for invoking a computer program stored in said memory, performing the steps of the method according to any of claims 1 to 15 in accordance with the obtained program.
  19. 19. A computer program product comprising computer programs/instructions which, when executed by a processor, implement the steps of the method of claim 1.

Description

Method and device for determining relationship between teeth Technical Field The present invention relates to the field of image analysis technology, and in particular, to a method and apparatus for determining relationships between teeth. Background During orthodontic treatment, the relationship between the teeth of a patient, which may be either an occlusal relationship or an interproximal relationship between the teeth, is generally considered a problem that requires significant attention and correction. The occlusion relationship of the teeth in the traditional orthodontic treatment has important significance for evaluation of the malocclusion, denture restoration design, measurement of occlusion contact area and observation of tooth abrasion, provides accurate occlusion relationship, has guiding effect on invisible orthodontics, accurately judges the relationship among the teeth, and is helpful for formulation and adjustment of subsequent treatment plans. At present, digital oral technology is rapidly developed, and a digital treatment auxiliary system can help to establish a digital tooth model and provide data support for the design of an orthodontic treatment scheme. However, it is difficult to determine the interdental relationship more accurately by three-dimensional images such as CBCT, which may affect the creation or use of subsequent tooth models and thus treatment planning. Disclosure of Invention The embodiment of the invention provides a method and a device for determining an interdental relationship, which are used for solving the problem that the interdental relationship cannot be determined accurately in the prior art. In a first aspect, an embodiment of the present invention provides a method for determining a relationship between teeth, including obtaining a three-dimensional digital model of teeth collected by a patient in at least one correction stage or from the patient, determining tooth characteristic information of at least one tooth according to the three-dimensional digital model of teeth, the tooth characteristic information being used for characterizing a spatial characteristic of the tooth, determining a reference line of the first tooth and an auxiliary line corresponding to the reference line according to the tooth characteristic information of the first tooth, the reference line and the auxiliary line forming at least one divided region, the first tooth being one tooth in the three-dimensional digital model, determining a tooth surface region corresponding to the same divided region from the tooth characteristic information according to the reference line and the auxiliary line corresponding to the reference line, and determining a relationship between the first tooth and other teeth in the tooth surface region. According to the technical scheme, through the tooth characteristic information formed by the plurality of tooth data, at least one datum line and the auxiliary line corresponding to the at least one datum line can be accurately determined, and then the tooth data of the screening boundary formed by the datum line and the auxiliary line corresponding to the datum line can be accurately screened out from the tooth characteristic information, so that the tooth data conforming to the screening boundary can be combined to obtain the corresponding tooth surface area, and the tooth interdental relationship can be accurately determined according to the tooth area between the first tooth and other teeth conveniently. Optionally, the tooth data in the same dividing region is determined from the tooth characteristic information, so that a tooth surface region corresponding to the dividing region is obtained, wherein the tooth surface region comprises at least one of determining tooth data in a first screening boundary from the tooth characteristic information, so that an occlusal surface of the tooth is obtained, the first screening boundary comprises at least one of a tooth ridge line as a reference line and a biting line as an auxiliary line, determining tooth data in a second screening boundary from the tooth characteristic information, so that front and rear tooth surfaces of the tooth are obtained, the second screening boundary comprises at least one of a tooth ridge line as a reference line, a tooth crown boundary line and a middle side line as an auxiliary line, and determining tooth data in a third screening boundary from the tooth characteristic information, so that a middle side surface of the tooth is obtained, wherein the third screening boundary comprises at least one of a tooth crown boundary as a reference line and a biting line as an auxiliary line and a middle side line. Optionally, the determining at least one reference line and the auxiliary line corresponding to the at least one reference line according to the tooth characteristic information comprises at least one of determining a tooth ridge line and a tooth root crown boundary line serving as the refe