Accuracy of radiographic measurements for implant planning using cone-beam and helical computer tomography.
AIM
The aim of the present study was to compare the accuracy of radiographic measurements for dental implants planning using cone-beam computed tomography (CBCT) and helical computed tomography (HCT).


METHODS
Six pig ribs were wrapped by putty impression material, with radiographic markers placed. Two CBCT and an HCT were taken following the standard protocols. Twenty-five locations were selected, with vertical and horizontal dimensions measured using the default software, as well as on the processed HCT films by a digital caliper. The actual dimensions of the ribs measured by the digital caliper served as the control. Differences between radiographic dimensions and the actual dimensions were tested by two-way analysis of variance.


RESULTS
No differences were found between measurements made by CBCT and HCT images using the default software (P > 0.05). However, both measurements were statistically-significantly lower than the control (P < 0.001), and the mean difference was 0.3 mm. Measurements made on HCT films were statistically-significantly greater than the control (P < 0.001), and the mean difference was 0.5 mm.


CONCLUSION
The accuracy of CBCT and HCT are similar, and both are reliable tools for implant planning. It is preferable to perform the planning using default software, rather than making direct measurements on films.
['Leung|Carl K K|CKK|', 'Pow|Edmond H N|EHN|', 'Li|Thomas K L|TKL|', 'Lo|Edward C M|ECM|', 'Chow|Tak W|TW|']
D000818:Animals D054893:Cone-Beam Computed Tomography D003758:Dental Implantation, Endosseous D061827:Dimensional Measurement Accuracy D013552:Swine D013813:Therapy, Computer-Assisted D036542:Tomography, Spiral Computed
accuracy helical computed tomography dental implant cone-beam computed tomography pre-operative planning