• CBCT introduced in implant dentistry in 1980, by rotating the radiation source 3D image generated as multiple axial slices.
• CBCT is used to enhance the safety and precision of implant procedure
• TECHNIQUE USED : Computer aided planning and computer aided manufacturing.

 

ROLE OF CBCT IN DENTAL IMPLANT PROCEDURE:

PRESURGICAL DIAGNOSIS:

1. TO ANALYSE ANATOMICAL LANDMARKS:

Damage to the nerves and canals during implant procedure can leads to partial or complete numbness of soft tissues. The surgeon can clearly locate the position of inferior alveolar canal, naso palantine canal, mandibular lingual undercut and maxillary sinus in CBCT which enables safety implant procedure. It helps in zygoma implants by analysing the location and extent of maxially sinus.

 

2. SELECTION OF IMPLANT SIZE:

The surgeon can select the size of implant more precisely by accurately measuring the available bone height and bone width to get good cortical support.

 

 3. PLACEMENT OF IMPLANT IN GOOD CORTICAL BONE:

Bone density can be interpreted digitally by using Houns field unit (HU) in CBCT.  Placing implants in good cortical  will increase the longevity of implants and withstands occlusal force.

 

FOLLOWUP:

CBCT can also be used to check the healing of implants(osseointegration)  in followup visits of implant patients.

 

ADVANTAGES OF CBCT OVER CONVENTIONAL X-RAYS:

• Low level of radiation compared to spiral CT
• High contrast resolution
• Images can be rotated and tilted
• Axial, Cross sectional and Panoramic section can be viewedz in single screen
• superimposition of images can be avoided
• upper and lower arch can be created and adjusted manually
• Bone height and width can be measured
• Bone density can be measured
• Nerves and canals can be located
• Same magnification for both anterior and posterior areas
• Trauma in jaw bone and joints can be detected
• Size and extent of periapical pathology can be analysed