Invisible orthodontic treatment method designing integral movement of teeth based on morphology of alveolar bones

A technology of invisible correction and overall movement, which is applied in the field of malocclusion correction, can solve problems such as neglected crown arrangement, falling off, bone cracking, etc., and achieve the effect of ensuring personal safety and ensuring safety

Inactive Publication Date: 2016-08-10
边专
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AI-Extracted Technical Summary

Problems solved by technology

[0004] However, the above method has a fundamental defect: the design of the invisible orthodontic scheme only pays attention to the arrangement of the crown and ignores the importance of the overall position of the teeth in the alveolar bone during the orthodontic process
Thus, there will be great hidden dangers in the process of patients accepting the above-menti...
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Method used

[0057] According to the data of the three-dimensional position adjustment of the teeth, the preset accessories are selected and placed on the crown to simulate the situation that the real accessories are bonded on the tooth surface. Wherein, the accessory is a light-cured lig...
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Abstract

The invention provides an invisible orthodontic treatment method designing integral movement of teeth based on the morphology of alveolar bones. The method comprises the following steps: S1, acquiring CBCT data; S2, acquiring STL data; S3, acquiring combining data of integral teeth; S4, reconstructing and restoring an original occlusion form in the mouth of a patient; S5, adjusting three-dimensional positions of the teeth; S6, carrying out simulated orthodontic treatment according to the adjustment data of the three-dimensional positions of the teeth; S7, generating a dentition model adjusting sequence; and S8, producing an invisible appliance meeting requirements. According to the invention, accurate morphological data of a dental crown is acquired through the digital dentition model, three-dimensional morphological data of teeth roots and alveolar bones are acquired through CBCT, and the morphological data of the dental crown and the three-dimensional morphological data are combined and matched; thus, the positional relationship between the teeth roots and the alveolar bones can be clearly seen in real time in designing of an invisible orthodontic treatment scheme and in generation of the dentition model sequence capable of simulating movement of teeth, and the problems of periodontal fenestration defects, periodontal cracks and obvious absorption of teeth roots caused by close collision between the teeth roots and the alveolar bones are overcome.

Application Domain

Technology Topic

DentitionBite registration +3

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  • Invisible orthodontic treatment method designing integral movement of teeth based on morphology of alveolar bones

Examples

  • Experimental program(1)

Example Embodiment

[0036] The present invention will be described in detail below in conjunction with the embodiments shown in the drawings, but it should be noted that these embodiments are not a limitation of the present invention, and those of ordinary skill in the art make functional, method, or structural improvements based on these embodiments. Equivalent changes or substitutions fall within the protection scope of the present invention.
[0037] The present invention mainly uses CBCT to match the digital dentition model to reconstruct the three-dimensional shape of the tooth. In the design of the invisible correction scheme and the generation of the dentition model sequence that simulates the movement of the tooth, the tooth root relative to the alveolar bone can be clearly seen in real time. The positional relationship avoids the close collision between the tooth root and the alveolar bone causing bone opening and bone cracking, thereby realizing the design of the overall tooth movement.
[0038] Such as figure 1 As shown, the invisible correction method for overall tooth movement design based on the shape of the alveolar bone of the present invention includes the following steps S1 to S8:
[0039] S1. Obtain the CBCT data of the three-dimensional shape of the patient's tooth crown, tooth root, and alveolar bone.
[0040] Among them, CBCT is the abbreviation of Cone beam CT, that is, cone beam CT. It is a cone-beam projection computer recombination tomographic imaging device. Its principle is that the X-ray generator uses a low radiation dose (usually the tube current is about 10 mA) to make a ring DR (digital projection) around the projection body. . Then the data obtained in the "intersection" of multiple digital projections around the projected body is reorganized in the computer to obtain a three-dimensional image.
[0041] Therefore, based on CBCT, the step S1 specifically includes:
[0042] S10. Obtain the patient's oral and maxillofacial soft and hard tissue data through CBCT, and perform 3D reconstruction of the overall shape of teeth and alveolar bone;
[0043] S11. Through the segmentation method, according to the overall shape of the reconstructed tooth and alveolar bone, the patient's crown, tooth root, and alveolar bone are modeled separately to obtain the CBCT data of the patient's crown, tooth root, and alveolar bone.
[0044] S2. Obtain the STL data of the three-dimensional shape of the gingival surface of the patient's crown and peri-coronal side.
[0045] This step is used to obtain accurate crown shape data through the digital dental model. Specifically, the step S2 specifically includes: obtaining the STL data of the patient's crown and peri-coronal gingiva through intraoral scan or model scan.
[0046] S3. According to the CBCT data and the STL number, perform a three-dimensional reconstruction of the CBCT data, and perform precise registration with the STL data to obtain composite data of a complete tooth formed by the CBCT root data and the STL crown data.
[0047] Specifically, the step S3 includes:
[0048] S31. Segment the crown data in the STL data to obtain the crown data in the STL data separately;
[0049] S32. Perform three-dimensional reconstruction of the CBCT data, and register the segmented crown data and the crown data in the reconstructed CBCT data through a registration method, and then remove the CBCT crown data, and replace the CBCT tooth root The data and the STL crown data are spliced ​​together to obtain the composite data of the complete tooth formed by the CBCT root data and the STL crown data.
[0050] In step S32, according to the imaging principle of CBCT, the crown data of CBCT cannot be reconstructed into a flat and smooth shape, which will affect the production of subsequent appliances. Therefore, after the registration is completed, the crown data of CBCT needs to be removed to achieve CBCT The splicing of the root data and the crown data of STL.
[0051] S4. According to the alveolar bone data and composite data in the CBCT data, reconstruct and restore the original occlusal shape of the patient's mouth.
[0052] S5. Determine whether the patient needs a pre-correction tooth extraction. If necessary, perform a simulated tooth extraction, and then adjust the three-dimensional position of the teeth according to the patient's original occlusal form. Otherwise, directly adjust the three-dimensional position of the teeth according to the patient's original occlusal form.
[0053] Specifically, in the step S5, when the three-dimensional position of the teeth is adjusted, it is performed as follows:
[0054] According to the correction requirements, simulate the design of the final dentition occlusion, adjust the root and crown positions in the composite data, observe the position of the tooth root in the alveolar bone in real time during the adjustment process, and set the allowable position of the tooth root in the alveolar bone. Realize the adjustment of the three-dimensional position of the teeth. Among them, when adjusting the three-dimensional position of the tooth, if the tooth root adjustment has moved out of the allowed position, a warning or prompt is issued.
[0055] S6. Perform simulated correction according to the data adjusted by the three-dimensional position of the tooth.
[0056] Specifically, in the step S6, when performing the simulation correction, proceed as follows:
[0057] According to the data of the adjustment of the three-dimensional position of the teeth, the preset attachments are selected and placed on the crown to simulate the situation where the real attachments are bonded to the tooth surface. Wherein, the attachment is a light-cured composite resin for dental restoration with a color similar to the tooth. In this way, the attachment positioning template is bonded to the teeth to facilitate the retention of the appliance, assist the movement of the teeth, and ensure the correction effect.
[0058] S7. According to the patient's original occlusal shape and the adjusted data of the three-dimensional position of the teeth, a dentition model adjustment sequence that simulates the movement of the teeth is generated.
[0059] Among them, in all the sequences, the positional relationship between the tooth root and the alveolar bone can be clearly observed.
[0060] S8. Adjust the sequence according to the dentition model, and produce invisible appliances that meet the requirements.
[0061] Specifically, as an implementation manner, in the step S8, the production of an invisible appliance that meets the requirements is carried out as follows:
[0062] Adjust the sequence according to the dentition model to produce the real model of each sequence, and then produce the invisible aligner through the film pressing method.
[0063] As another embodiment, according to the dentition model adjustment sequence, the 3D printing data of the invisible appliance is generated by the surface thickening method, and then the invisible appliance is produced by 3D printing.
[0064] To sum up, the invisible correction method of the present invention based on the shape of the alveolar bone to design the overall movement of the tooth obtains accurate crown shape data through the digital dentition model, and obtains the three-dimensional shape data of the tooth root and alveolar bone through CBCT, and Combine the two to match. In this way, in the design of the invisible correction plan and the generation process of the dentition model sequence that simulates the movement of the tooth, the position relationship of the tooth root relative to the alveolar bone can be clearly seen in real time, and the close collision of the tooth root and the alveolar bone can avoid bone opening. , The problem of bone cracking. Then, according to the precise crown shape obtained by the digital model, 3D printing is designed to produce invisible appliances. The invention ensures the safety of the patient's treatment during the entire invisible correction process and guarantees the patient's personal safety.
[0065] For those skilled in the art, it is obvious that the present invention is not limited to the details of the foregoing exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description, and therefore it is intended to fall within the claims. All changes within the meaning and scope of equivalent elements of are included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.
[0066] In addition, it should be understood that although this specification is described in accordance with the implementation manners, not each implementation manner only includes an independent technical solution. This narration in the specification is only for clarity, and those skilled in the art should consider the specification as a whole The technical solutions in the embodiments can also be appropriately combined to form other implementations that can be understood by those skilled in the art.
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