Advantages of CBCT?

Dental cone beam CT (cone beam CT), also known as digital volumetric tomography (digital volumetric tomography) is a new technology developed in the late 1990s. Because it can display normal tissue structure and diseased tissue in three dimensions (axial, coronal, and sagittal), and avoids the shortcomings of overlapping images on two-dimensional images, it has been widely used in clinics once it was launched. Compared with traditional CT, CBCT has several significant advantages: ①Extremely low radiation dose ②Extremely wide application range ③High spatial resolution and good imaging quality ④Easy to apply.

1.1 Application in dental implants

In dental implant surgery, the perfect preoperative design is the key to the success of the implant, and the perfect design comes from a comprehensive and accurate understanding of the jawbone. Selecting a suitable implant and placing the implant in an accurate position is the key to the success of the implant. key. In the past, stomatologists routinely inspected the jawbone before dental implant surgery using curved surface tomography, which encountered many difficulties in judging whether the jawbone had enough bone tissue to accommodate the implant. Studies have shown that curved surface tomography There is an error in the height of the alveolar bone, and it is not suitable to use curved plane slices before implant surgery. The post-processed multi-plane reconstruction images of CBCT technology can clearly display the positional relationship between the inspection site and the surrounding important anatomical structures, and can accurately locate important structures such as the mandibular canal, mental foramen, mandibular foramen, incisor foramen and maxillary sinus floor, and even These data can also be used to measure bone density on special software, select the appropriate artificial implant, and place it in the best position to avoid bone side penetration, penetration of the nasal cavity, maxillary sinus floor, and damage to important structures such as nerves and blood vessels. Reduce complications.

1.2 Guidance for impacted teeth

CBCT technology uses the volume data collected by one-time exposure to perform three-dimensional reconstruction of images from any angle. By cutting the axial surface at different angles, the impacted teeth can be observed from multiple directions, and the observation range suitable for human vision can be adjusted at will according to the needs of diagnosis. The spatial sense and realism of the image are enhanced, the anatomical relationship is clear, and the relationship between the three-dimensional shape of the anatomical structure and the position of the adjacent space is fully displayed, which is helpful for the surgeon to judge the specific position, type, eruption direction, and The displacement, the depth of the buccal and lingual side, and the relationship with the surrounding structures are of great significance to the formulation of the surgical path and treatment plan.

1.3 Differentiation of jaw cysts and tumors

The anatomical structure of the oral and maxillofacial region is complex, with many overlapping tissues. Although conventional X-ray photography can reflect the overall information of certain lesions (such as jaw tumors), and can also accurately display the relationship between lesions and teeth, but because of its imaging Two-dimensional images, images overlap a lot, and jaw cysts and tumors often invade the orbit, nasal cavity, maxillary sinus, pterygopalatine recess, and even the skull base, which has certain limitations in the early diagnosis of cysts, benign and malignant tumors. The biggest feature of CBCT technology is to perform three-dimensional reconstruction and cutting of the scanned original image, display the anatomical structure of the complex area of the human body in a three-dimensional form, and understand the adjacent relationship between the lesion and important anatomical structures such as the maxillary sinus, neural tube, and skull base. It is helpful for early detection of jaw lesions and clarification of the range of lesions in three-dimensional space, especially the involvement of the buccolingual bone plate, which is of great significance for determining the scope of surgery and formulating detailed and accurate surgical plans.

1.4 Application in endodontics

Because the arrangement of oral teeth is not on the same plane and has a certain physiological curvature, ordinary intraoral X-rays are often projected from different angles, and the three points of the film, teeth, and X-ray tube cannot be perpendicular to a straight line. The images overlap each other and cannot clearly show the direction of the root, which is misleading to the clinician and causes the root canal to be missed during root canal treatment. In the diagnosis of molar root lesions, it is difficult to judge which root has lesions, the degree and location of lesions, and whether there is any abnormality in the bone between and around the roots. However, after the CBCT technology obtains the original data through one-time exposure, because of its high spatial resolution, the obtained images are finely layered, with clear boundaries, and the root canal and side accessory root canals are clearly developed, and there are good images from the medullary cavity to the apex. The root canal image can also show the microstructure of the tooth body, periodontal ligament, and bone trabecula more clearly. The results show that analyzing the changes of the root canal from a three-dimensional perspective has important guiding significance for root canal treatment.

1.5 Application in temporomandibular joint disease

Temporomandibular joint disorders (Tempoomandiular disorders, TMD) is a frequently-occurring and common disease with complex pathogenic factors. Although traditional (TMJ) X-ray examination method is simple, cost-effective and has a long application history, it is the most commonly used method in TMJ radiology examination. However, because it is a two-dimensional image and is affected by complex anatomical positions, there are many overlapping parts of bone in X-ray images. Observations of key parts such as: changes in joint space, changes in condylar motion, changes in bone quality, and clinical Many condyle shape variations and fractures appear on the body, which will be deformed and blurred due to improper body position and projection angle, which will affect the diagnosis. When scanning with CBCT technology, through the correct positioning method, the scanned tomograms can clearly show the true images of the joint nodules, joint condyles, and condyles, and truly reflect the joint space in the middle of the joint, without being affected by it. The influence of the projection angle. At the same time, the three-dimensional reconstruction technology can be used to obtain the coronal and sagittal positions of the long axis of the condyle, the change of the double condyle surface and the fracture of the condyle.

1.6 Application in oral and maxillofacial trauma examination

Due to the complex anatomical structure of the oral and maxillofacial region, conventional X-ray images have many bone overlaps and are affected by the relationship between projection angles. Reliable clinical image information is often not obtained, which in turn affects the effects of diagnosis and surgical treatment. The volume data obtained by the CBCT examination is processed by the workstation. The image can not only clearly and three-dimensionally display the fracture location, shape and fracture displacement characteristics, but also intuitively reflect the length and direction of the fracture line, the distance of bone displacement and fracture fracture. Anatomical relationship of adjacent bones.