CBCT

CBCT

1. Outline Introduction How CBCT works CBCT vs Conventional CT CBCT in dentistry Conclusion

2. Introduction Radiology is important in the diagnostic assessment of the dental patient 3D diagnostic imaging of the jaws has been of interest since introduction of CT as a clinical tool. Because of relatively high cost, high dose, and availability limited to hospitals and medical radiology practices, use of this technology in dentistry has been limited.

3. What is CBCT? It is a technology used to take three dimensional (3-D) images of your teeth, maxillary sinus, nerve pathways, and bone in the maxillofacial region with a single scan.  

4. What is CBCT? The CBCT system rotates around the patient in approximately 30 seconds, capturing data using a cone-shaped x-ray beam.

5. When CBCT? Dental cone beam computed tomography is used when regular two dimensional dental x-rays are not sufficient. 

6. Why CBCT? With CBCT, clinicians can get highly detailed 3-D views of the facial region with lower radiation exposure than a conventional CT scan.

7. Why CBCT? This may help with the diagnosis, treatment planning and evaluation of certain conditions.

8. CBCT volume capture

9. Medical CT vs. CBVT

10. Medical CT vs. CBVT Medical CT: Slices are acquired then reconstructed to create the volume

11. Medical CT vs. CBVT CBCT: The volume is acquired then slices are reconstructed from the volume

12. Advantages Rapid scan time Beam limitation Image accuracy Reduction in patient radiation dose when compared to medical ct (10 times less) Economical comfortable and safe

13. Disadvantages Scatter Motion artifacts due to increased scan time Poor contrast resolution, thus soft tissue cannot be reviewed

14. Use in dentistry Implantology and prosthodontics Oral and maxillofacial surgery Endodontics Periodontics Orthodontics

15. Implantology and Prosthodontics To assess the quantity and quality of bone in edentulous ridges and implant cases. Implant site evaluation, accurate measurements, accurate planning of implant in relation to vital structures , surgical guide, Computerised Prosthesis Evaluation roots of upper posterior teeth in respect to the maxillary sinus, sinus lift.

16. Oral and Maxillofacial surgery CBCT enables the analysis of jaw pathology, the assessment of impacted teeth, supernumerary teeth and their relation to vital structures.

17. The assessment of bone grafts. It is also helpful in analysing and assessing paranasal sinuses

18. Orthognathic surgeries Post treatment esthetic evaluation TMJ, and condyle Tooth auto transplants Cleft palate Craniofacial reconstruction Mid face fracture cases of fractures of the facial bones

19. Endodontics CBCT is a very useful tool in diagnosing apical lesions Crown morphology, pulp chamber, proximal caries Root morphology, number of root canals, course and direction of canals, accessory canals, root resorption , root fractures

20. Endodontics Obturation , filling, under and overfilling, sinus problems Broken instruments Useful in planning periapical endodontic surgery as the anatomical structures such as inferior dental canal, mental foramen, maxillary sinus can be easily differentiated and relation to root can be quantified.

21. Periodontics CBCT can be used in assessing a detailed morphologic description of the bone Measuring of bony defects, furcation involvement, buccal & lingual defects.

22. Orthodontics Orthodontists can use CBCT images in orthodontic Complete hard tissue examination and record, type of dentition present, Arch size, arch shape, symmetry of arches, anteroposterior and transverse maxillo mandibular relationship , number , size of teeth, shape of teeth,

23. Typical doses of various dental radiological procedures Intra-oral 0.001 mSv up to 0.004 mSv Full-mouth set 0.080 mSv Lateral cephalogram 0.002 mSv Dental panoramic technique 0.015 mSv CBCT (both jaws ) 0.068 mSv Hospital CT scan (both jaws) 0.6 mSv

24. Conclusion It is vital or any clinician to remain in touch with latest innovations in the field of one's expertise and apply the same for the benefit of patient care and be ready and willing to accept new trends. CBCT is one such recent advancement in the field of Dentistry which one should learn and adapt into clinical practice .

25. References https://www.oaklandoralsurgery.com/blog/what-is-cbct/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4377156 /