this lecture is consist of the principle of CBCT and how to use three dimensional image for diagnosis of intra oral disease

1. BY: Dr. Maryam Salman
Supervised by: Dr. amal

2. What is CBCT ??
Cone Beam Computed Tomography (CBCT) is a relatively new technology to dentistry, used for the three-
dimensional imaging of the teeth and jaws . CBCT is a result of dramatic advances in computer and
electronic technology and (along with similar advances in scanning and manufacturing) is one of the key
components in the rapidly evolving field of digital dentistry. It is becoming widely available and has
applications in implant dentistry, endodontics and oral surgery.

3. Why 3D image ??

4. Why 3D Image ??

5. CT

6. CT

7. CT

8. CBCT

11. Principals of CBCT: Field of view(FOV)
Large
Medium
Focused

12. Principals of CBCT: Field of view (FOV)
Large
Medium
Focused

13. Principals of CBCT: Field of view (FOV)
Large
Medium
Limited

14. Principals of CBCT: Field of view (FOV)
Large
Medium
Limited

15. Principals of CBCT: Field of view (FOV)
Large
Medium
Limited
Stitched

17. Field of view

18. Radiation dose

19. Basic planes
SagittalGtIT
TAL
AxialIAL coronal

20. AXIAL CORONAL SAGITTAL

21. Advantages
• Rapid scan time
• Beam limitation
• Image accuracy
• Reduction in patient radiation dose
when compared to medical ct
• Interactive display modes
• Multiplanar reformatting
• 3 dimensional volume rendering
• Better images with good spatial
resolution
• Economical, comfortable and safe
Disadvantages
• Scatter
• Artifacts
• Poor contrast resolution, thus soft
tissue cannot be viewd
• Image noise is detrimental

22. Clinical application of CBCT

23. Diagnosis of endodontic pathosis
1. Diagnosis of endodontic pathosis
Canal morphology
Assessment of pathosis of non-endodontic
origin
Evaluation of root fractures and trauma
Analysis of external and internal root
resorption and extraradicular invasive
cervical resorption
Pre-surgical planning
Implant planning
Cotton TP, Geisler TM, Holden DT, Schwartz SA, Schindler WG. Endodontic applications of cone beam volumetric tomography, J Endod 2007;33:1121–1132.

24. Canal number

25. Canal length

26. Root fracture

27. surgical planning for impacted teeth.

28. accurate placement of dental implant

29. evaluation of the sinuses

30. Detecting and measuring jaw tumors

31. reconstructive surgery.

32. fracture

33. orthodontics

34. Cephalometric analysis.

35. Hazard of cbct
There is always a slight chance of cancer from excessive exposure to radiation. However, the
benefit of an accurate diagnosis far outweighs the risk.
CT scanning is, in general, not recommended for pregnant women unless medically necessary
because of potential risk to the baby .
Because children are more sensitive to radiation, they should have a CT exam only if it is
essential for making a diagnosis and should not have repeated CT exams unless absolutely
necessary. CT scans in children should always be done with low-dose technique