cbct2Cone bem 3D Imaging课件

1、a breakthrough imaging technology for dentistrycbctcone beam 3d imagingcbct system 3d image display 3d image processingdental 3d cbct scannera”cone shaped” beam scan around the patients head in a single pass to obtain images.then the software reconstructs the imagestransforming them into a three-dim

2、ensional databasedental cbct images can be reformatted in any drection desired with multiple sections.cbct system classificationbig-field mode small-field mode medium-field modeincluding double jaw, maxillary sinus and part of the nose some of the teeth or single jawl including the entire maxillofac

3、ial region la great choice for orthodontists usage.and also can be used for airway and tmd treatment,as well as complex facial surgeryis design for surgically placing implants and oral surgerycbct imaging is characterized by:extraordinary accuracy rapid scan time only 20 second scanreduced radiation

4、 dose equivalent to 6-7 panoramic radiographsunmatched three-dimensional image reconstruction capabilities cbct vs. cttraditional ct uses a very narrow fan beam that rotates around the patient acquiring one, or more, thin axial slice(s) with each revolution. to image a section of anatomy, many rotat

5、ions must be completed which means high radiation exposure.cbct uses a cone shaped beam to acquire the entire volume in a single pass around the patient, resulting in much less radiation exposure.cbct (right) compared to fan-beam ct (left).1. radiation dose: the medical ct effective dose is about 8-

6、10 times of the cbct effective dose in the same region scanned.region scannedcbct effective dose (sv) icrp 2007medical ct effective dose (sv) icrp 2007mandible75.3503*full head110.51,088.3*what is the difference between a cbct scan and a medical ct scan?2. image resolution:for hard tissues and teeth

7、, cbct offers higher resolution and image sharpness compared to medical ct (multi-slice ct or msct).cbct offers better metal artifact reduction compared to medical ct. this is important because many patients have metallic crowns or restorations that cause streaking artifacts that may interfere with

8、the visualization of the region of interest.3. metal artifact reduction:4. soft tissue contrast:one of the limitations of cbct is the poor soft tissue contrast compared to medical ct or magnetic resonance imaging (mri). while cbct is appropriate to evaluate osteoarthritic changes of the temporomandi

9、bular joint (tmj), it is not suited for evaluation of tmj disc displacement. similarly, tumors within the soft tissue cannot be adequately evaluated using cbct.clinical applicationsimplantologymaxillofacial surgeryorthodonticsendodontics impactionsperiodontics cbct is used by gps and specialists to

10、improve diagnosis and treatment planning in the following cases: cbct combined with professional implant software can be applied to all aspects of implant dentistry clinic, including the planting of training, patient communication, treatment plans, clinical implementation and planting effect evaluat

11、ion.implants location of anatomic structures: mandibular canal, submandibular fossa, incisive canal, maxillary sinus analyze the size and shape of ridge, quantity and quality of bone determine the number, orientation of implants and the need for bone graft, sinus lift we use cbct and the implant sof

12、tware-aided to desigh the implant template and then fabricated in the laboratory. combined with templates to guide the direction and position of the implant surgery, which greatly improved the success rate of implant orthodonticsthe role of cbct in orthodontics lies mainly in the following aspects:1

13、. determine the location of the pathological lesion : impacted teeth (translocations, impacted, deformity, supernumerary teeth ), maxillary cysts, polyps, apical inflammation.cyst on the right maxillary sinusslight shadow can be seen in the panoramic image. the cbct allows for a more precise analysi

14、s of the exact position and orientation of the impacted tooth. further detailed information can be obtained in the image of 3d reconstruction. left maxillary canine impacted 2. tmj evaluation: evaluate the proportion of three joint cavity around the condyle, condylar morphology, whether there is abs

15、orption, abrasion, and even trauma.condylar fracture3.guide the planting of the implant nails, choose the implant site, the height and angle, to ensure the implant security and stability. planting the nail between rootswhile cbct technology is of tremendous value in clinical medicine, its important

16、to remember these scans still expose our patients to radiation and therefore should only be used when indicated and not simply in cases for which there is not a need or indication.impactionscone beam ct can provide a more accurate assessment to provide more predictable treatment results while reduci

17、ng the risks associated with any impacted tooth.better assess the risk of treatment or non-treatment based on more accurate 3-dimensional analysis the regular 2d x-ray image showing no evidence of root fracture;however, the sagittal image of the 3d cbct scan reveals a root facture. root fracturea) clinical aspect of tooth 22; b) periapical radiograph of anterior teeth showing no evidence of root fracture; c,d) cbct i