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Method for establishing standard median sagittal plane by applying bone markers for craniofacial deformity

A sagittal and craniomaxillofacial technology, applied in the field of maxillofacial plastic surgery, can solve the problems of different types of deformities, no unity, and large errors in the median sagittal plane, so as to improve accuracy and reduce operation time.

Inactive Publication Date: 2017-11-24
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no uniform standard for selecting landmarks at present, and there is no method of forming a unified regularity because of the different types of deformities
The second is to apply the ICP algorithm, that is, the computer iterative algorithm to maximize the overlap between the mirror image and the original image, but this method often causes a large error in the determined median sagittal plane due to craniomaxillofacial bone deformities

Method used

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  • Method for establishing standard median sagittal plane by applying bone markers for craniofacial deformity
  • Method for establishing standard median sagittal plane by applying bone markers for craniofacial deformity
  • Method for establishing standard median sagittal plane by applying bone markers for craniofacial deformity

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Embodiment 1

[0030] The present invention proposes a new method for determining the median sagittal plane by applying bony landmarks according to different types of cranio-maxillofacial deformities, and applying data image processing software (Mimics software, geomagic software) to establish and apply bony landmarks to locate the median sagittal plane The specific method is as follows:

[0031] (1) Data acquisition: Spiral CT data of 10 patients with cranio-maxillofacial deformities (cranio-maxillofacial fractures, tumors, bone defects) in West China Stomatological Hospital in 2015 were selected.

[0032] A 16-slice thin-layer spiral CT (Philips MX16 EVO CT, Holland) was used, and the parameters were set to: voltage 120kv, current 7700mAs, pixel size: 512×512, layer spacing: 0.5mm, field of view: 250mm, layer thickness: 1.0mm). During the shooting, the patient also asked for a relaxed expression, with both eyes looking forward, and the occlusion in the mouth was cusp interlacing, without chewin...

Embodiment 2

[0062] Patient Zhang, male, 19 years old. High falls in January. Diagnosis: Comminuted fracture of mandibular chin; fracture of left condyle.

[0063] The patient only had a mandibular fracture, which was characterized by the displacement of the mandibular landmarks along with the fracture, and the remaining landmarks remained unchanged.

[0064] Determine the mid-sagittal plane: Generally speaking, the base of the nose is selected for the upper area, the anterior nasal spine or the upper central incisor point is preferred for the lower area, and the skull base or posterior nasal spine is preferred for the posterior area. If the anterior nasal spine or the upper central incisor point is obviously deviated, consider using a posterior nasal spine instead.

[0065] After determining the median sagittal plane, locate the anterior chin, chin or incisor point, and guide the fracture block so that these three landmark points are located on the median sagittal plane. Specific steps are as...

Embodiment 3

[0072] The patient Jiang Mou, male, 43 years old. Injured for 2 days. Diagnosis: Left zygomatic orbital maxilla and zygomatic arch fracture.

[0073] The patient had a unilateral middle fracture, which was characterized by no deviation of all landmarks.

[0074] Determine the mid-sagittal plane: choose the nasal root point in the face area, the anterior chin point or the chin point in the subface area, and the skull base point in the posterior area. By determining the median sagittal plane to mirror the normal side to the fractured side, the reduction of the fractured block on the fractured side can be known. Specific steps are as follows:

[0075] (1) Spiral CT was taken in the supine position of the patient, and the data was imported into MIMICS software to reconstruct the skull image and segment the fracture.

[0076] (2) The patient had a unilateral middle fracture, and the occlusal relationship was basically normal. Choose the nasal root point, the anterior chin point, and the...

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Abstract

The present invention relates to the medical field of maxillofacial plastic surgery, in particular to a method for establishing a standard median sagittal plane by using bony landmarks according to different types of craniofacial deformities, after data acquisition, data processing, and screening of commonly used landmarks and standard median sagittal plane According to the establishment steps of different fracture classifications, select three landmark points, establish a standard median sagittal plane, and the average distance after registration is <1.5mm as the qualified standard. The method of the present invention applies the above-mentioned method of classifying craniomaxillofacial deformities so as to select different landmark points, which can regularize and simplify the determination of the median sagittal plane, thereby reducing the time for clinicians to operate in the process of determining the median sagittal plane, and The accuracy of mirror image results is improved, which in turn improves the accuracy of preoperative computer-aided surgery design.

Description

Technical field [0001] The invention relates to the medical field of maxillofacial plastic surgery, in particular to a method for cranio-maxillofacial deformities to establish a standard median sagittal plane by applying bony landmarks according to different types of deformities. Background technique [0002] Fracture displacement and bone defects secondary to cranio-maxillofacial trauma are one of the important causes of cranio-maxillofacial deformities. The abnormalities of facial morphology and function caused by them seriously affect the physical and mental health of patients. How to reduce fractures accurately and minimally To restore the patient's facial shape and occlusal function has always been the most difficult point of clinical research in oral and maxillofacial surgery. In recent years, based on CT three-dimensional reconstruction technology, medical virtual surgery design software and surgical navigation technology have developed rapidly. Clinicians can apply medica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B34/10
CPCA61B34/10A61B2034/105A61B2034/107
Inventor 汤炜田卫东廉小天青海曾维周忠伟
Owner SICHUAN UNIV
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