Data acquisition methods commonly used in clinical jaws

The commonly used data acquisition methods for clinical jaws are as follows:

1. Collect oral soft and hard tissue information: oral soft and hard tissue includes maxillary and mandibular teeth including alveolar bone, dentition, gingiva and the occlusal relationship between maxillary and mandibular teeth. Non-digital information collection means include apical X-ray photos and traditional impressions. At present, oral and maxillofacial cone-beam CT, digital intraoral scanning and extraoral scanning are usually used to collect relevant information.

2. Digital intraoral scanning: Digital intraoral scanning is a way to obtain morphological information of oral soft and hard tissues, which consists of optical photography, computer processing and virtual imaging. The main principle is that the soft and hard tissues in the oral cavity are reflected on the computer through the optical information of laser and visible light, and a visual three-dimensional model is presented under the fusion of information. Digital intraoral scanning used in clinic can be divided into two types. One is the indirect scanning method, that is, the scanner or scanning bin scans the plaster model to obtain the oral information of the patient indirectly. The second is chair side scanning method, that is, the scanning head is placed in the patient's mouth and directly scanned to obtain oral information in real time. The chair side scanning method can directly obtain the occlusal relationship and motion trajectory of the maxilla and mandible, and measure the occlusal space of the maxilla and mandible in real time.

3. Digital extraoral scanning: Extraoral scanning is to obtain the positional relationship between soft and hard tissues such as dentition and facial tissues in the patient's mouth through optical photography and virtual imaging technology of extraoral scanner. This technique is usually applied to the treatment of edentulous patients: after multiple implants are implanted, a specific scanning rod is connected to the implants, and the extraoral scanning equipment can identify several specific marking points on all scanning rods at the same time, so as to accurately obtain the implant position corresponding to the scanning rod.