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Guided access cavity preparation using cone-beam computed tomography and optical surface scans - an ex vivo study
J Buchgreitz1, M Buchgreitz1, D Mortensen2
1Private practice, Allerød, Denmark.
International Endodontic Journal
|July 24, 2015
Summary
This study shows a new guide rail technique accurately prepares teeth with pulp canal obliteration (PCO). The method, using cone-beam computed tomography (CBCT) and optical scans, achieved precise drill paths below a risk threshold.
Area of Science:
- Endodontics
- Dental Technology
- Radiology
Background:
- Pulp canal obliteration (PCO) presents challenges in endodontic retreatment.
- Accurate navigation is crucial for preparing obliterated root canals.
Purpose of the Study:
- To assess the accuracy of a novel preparation technique for PCO using a guide rail system.
- The system integrates cone-beam computed tomography (CBCT) and optical surface scans.
Main Methods:
- A guide rail was designed using merged CBCT and optical surface scans of 48 teeth with simulated apical canal remnants.
- A metal sleeve within the guide rail directed a bur for pathway creation.
- Drill path accuracy was measured against the target apical preparation.
Main Results:
- The mean deviation of the drill path from the target was significantly less than 0.7 mm (P < 0.001).
- Intra- and inter-examiner agreement for measurements was excellent.
- The achieved precision was below the defined risk threshold.
Conclusions:
- Combining CBCT and optical scans for guide rail construction enables precise drilling for PCO.
- This technique offers a valuable approach for navigating partially or completely obliterated root canals.
- The method demonstrates high accuracy and reproducibility in ex vivo testing.
