What Is a Dental CT Scan?
Oral CT can reflect the tissue situation from a three-dimensional perspective, and can find lesions that cannot be found in the oral X-ray projection angle, or more subtle lesions; its three-dimensional reconstruction effect can accurately evaluate the condition of the bone tissue and the condition of the mandible. Assist doctors in the design of preoperative procedures and scientific evaluation after surgery (such as chin correction surgery).
- Chinese name
- Oral CT
- Include
- Reflect the organization from a three-dimensional perspective
- Application
- Application of Oral CT in Orthodontics
- Method
- Oral CT Scanner and ADW4.0 Image Processing
- Oral CT can reflect the tissue situation from a three-dimensional perspective, and can find lesions that cannot be found in the oral X-ray projection angle, or more subtle lesions; its three-dimensional reconstruction effect can accurately evaluate the condition of the bone tissue and the condition of the mandible. Assist doctors in the design of preoperative procedures and scientific evaluation after surgery (such as chin correction surgery).
Oral CT applications
- Application of Oral CT in Orthodontics
- Oral CT is a spiral volume of data collected around a human body. The essential difference between oral CT and conventional CT is that the former obtains three-dimensional information, while the latter obtains two-dimensional information. Oral CT improves scan speed and wide scan coverage
- The oral CT scanner and ADW4.0 image processing workstation were used to discuss the practical methods and techniques of CT dental surface imaging. It is considered that oral CT dental surface imaging technology has important guiding significance in orthodontic treatment. The reasonable selection of scanning and reconstruction parameters and the accurate application of image post-processing methods are the keys to obtaining high-quality 3D images. With the help of DCT, it is possible to display the distance from the labial and bony cortical bone and the direction and position of the impacted teeth through two-dimensional two-dimensional images. The two-dimensional reconstructed image is especially relevant to adjacent structures (such as Alveolar neural tube, maxillary sinus, and adjacent root) have unique advantages, which can make up for many shortcomings of curved surfaces.
- Summarize the significance of oral CT in the diagnosis of impacted teeth and multiple teeth: it can accurately display the number, size and shape of embedded multiple teeth in bone; it can determine the spatial location of impacted multiple teeth (lip buccal, lingual, height And tilt); can determine whether the location of the impacted multiple teeth is soft tissue impaction or intra-jaw impaction; can accurately show the distance or embedded relationship between the impacted multiple teeth and adjacent tooth germs and roots; can show whether adjacent roots occur Absorption and extent of absorption. Reasonable application methods of 3D reconstruction of oral CT in the positioning of impacted teeth: MIP (Maximum Density Projection) can show the overall view of teeth and longitudinal arrangement of teeth; MPR (Multiplanar Reconstruction) The local relationship display is clearer; SSD (Surface Cover Display) can show the external contours, overall shape of teeth and jaws, and the relationship between tooth arrangement and jaws. Therefore, it has extremely important clinical significance and development prospects for orthodontic traction treatment and jaw surgery.
- Application of dental CT in the field of dental correction
- Oral CT can simulate panoramic radiographs and lateral skull radiographs, which will be very convenient for orthodontists. Its specific applications include: Reconstruction of oblique planes of images. This technique generates a two-dimensional image of a non-transverse plane by traversing a stacked cross-section image. This method is very useful in evaluating the structure of TMJ and the ambush third molar, because some features are more obvious than in the MPR image perpendicular to each other; the reconstruction of the curved surface of the image. This method is useful in displaying dental arches and can provide panoramic thin-layer images obtained by aligning the long axis of the imaging plane containing specific anatomical structures. The images will not be deformed and can be used for accurate anatomical morphological measurements. According to the size and angle obtained by them, there are only small errors; continuous reconstruction through the plane. This technique produces a series of sequentially superimposed cross-sectional images that are perpendicular to a beveled or curved image. The image is a thin layer (eg, 1 mm thick) with a known pitch (eg, a distance of 1 mm).
- The final image is useful for specific morphological evaluations, such as measuring the height and width of alveolar bone to estimate the implant site, the lower inferior alveolar neural tube associated with mandibular impacted molars, or the pathological evaluation of diseases affecting the jaw. Honey OB et al. [10] also studied the accuracy of CBCT measurement, and the results showed that the CBCT image has a high degree of reliability, and the accuracy of CBCT diagnosis is significantly higher than that in determining whether the condyles are damaged by cortical bone Linear tomography and panoramic X-ray photography of other two-dimensional joint areas. At the same time, it was found that the two-dimensional cranial lateral radiographs produced by CBCT were more accurate than most traditional cranial lateral radiographs in the measurement of most line spacing (sagittal plane). In short, many scholars believe that the measurement of CBCT images of teeth, jaws, and facial structures is repeatable, and it is significantly more accurate and reliable than traditional cephalometric measurements. This technology will undoubtedly expand the application of 3D imaging technology in the field of orthodontics.
Advantages of oral CT
- Advantages of oral CT
- Oral x-rays are used for routine oral disease examinations. General tooth root inflammation, tooth fractures, and bone conditions can be better reflected. However, its limitation is that it can only be projected from a fixed direction. Some lesions are not easy to be detected due to the coincidence of tissues (for example, a dense bone is blocked in the front, and a lower density bone is not easy to see. Up).
- Advantages of oral CT
- Faced with some serious diseases, CT examination is a clearer and more accurate examination method. It scans the human body to observe tissues and lesions in the body. Dental CT equipment is used by more and more hospitals. Its small size, equipment cost and use cost are lower than whole body CT, but it has the advantage of clearer and more accurate CT.
- Advantages of oral CT
- Oral CT is painless. Due to the reduced scope of exposure, human exposure to radiation is also significantly reduced compared to whole body CT.