Volume 24, Issue 104, July - August, 2020

In vitro effect of head position on the accuracy of linear measurements of implants at the sites of maxillary lateral incisors and first molars on cone-beam computed tomography scans

Sanaz Sharifi Shoshtari¹, Atefeh Sheikhi^2♦

¹Assistant professor, Department of Oral and Maxillofacial Radiology, School of Dental Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
²Oral and Maxillofacial Radiology Resident, Department of Oral and Maxillofacial Radiology, School of Dental Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.

^♦Corresponding author
Oral and Maxillofacial Radiology Resident, Department of Oral and Maxillofacial Radiology, School of Dental Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran

ABSTRACT

Objectives: This study assessed the effect of head position on the accuracy of linear measurements of implants at the sites of maxillary lateral incisors and first molars using cone-beam computed tomography (CBCT). Materials and Methods: This in vitro study evaluated seven dry human skulls. Four titanium implants were bilaterally placed at the sites of maxillary lateral incisors and first molars. CBCT scans were obtained following tipping of the skulls by +20°, +10°, 0°, -10°, and -20°. The change in height of implants visualized on each CBCT scan was calculated compared with their actual height measured by a caliper. Data were analyzed using ANCOVA and Wilcoxon test. Results: On CBCT scans, the height of posterior implants in +20° (P=0.032) and +10° (P=0.017) tipping positions was significantly higher than the actual value; but no significant difference was noted in other positions. The mean height of anterior implants in the right side on CBCT scans was significantly higher than the left side in -10° (P=0.025) tipping position. The mean implant height in the right side was significantly lower than the left side in +10° (P=0.017) and 0° (P=0.041) tipping positions. In the posterior region, the mean implant height in the right side was significantly lower than the left side in -20° (P=0.025) and +10° (P=0.017) tipping positions. Conclusion: Backward tipping of the head by 20° and 10° affects the implant height on CBCT scans. The possibility of change in linear measurements in the posterior implants is higher than in the anterior implants.

Keywords: Dimensional Measurement Accuracy; Cone-Beam Computed Tomography; Dental Implants; Patient Positioning

Medical Science, 2020, 24(104), 2655-2662

PDF