Effect of dental restorations materials on the voxel density value of CBCT

Document Type : Original articles

Authors

1 oral and maxillofacial radiology, dentistry, Ain shams University, Cairo, Egypt

2 Oral and Maxillofacial Radiology, Faculty of Dentistry, Ain shams university, Cairo, Egypt.

3 oral radiology department faculty of dentistry Ain shams university

10.21608/asdj.2025.358072.1836

Abstract

Aim: To assess the effect of various dental restorations positioned outside the field of view (FOV) on voxel Density Value (VDV) in CBCT scans, specifically examining variations of VDV in low- and high-dose imaging protocols.
Materials and methods: An ex-vivo study was conducted using dentate human skull and mandible with missing lower right second premolar. A layer of pink baseplate wax was applied to simulate soft tissues. Different restorations (implants, porcelain-fused-to-metal (PFM) bridges, and zirconium bridges) were placed sequentially in three distinct locations outside the FOV. Standardized CBCT scans for lower right premolar region were acquired using both low-dose (90 kV, 3.2 mA) and high-dose (90 kV, 6.3 mA) protocols in absence and presence of different restorations in the three locations outside of FOV, both protocols were applied. Standardized CBCT scans of all specimens were taken using a GENDEX GDXP-700 (KAVO, Biberach, Germany).  Two calibrated and blinded oral radiologists measured VDV, comparing high-dose and low-dose images without (gold standard group) and with (test group) restorations outside the FOV.
Results: Significant differences in VDV were observed between control and experimental groups, particularly at the apex of the region of interest, with varying effects based on the restoration type and imaging dose. High-dose imaging generally showed more pronounced differences compared to low-dose imaging (p< .001). Among all restorations, titanium implants provided the most significant difference, ensuring affected outcomes and overall efficacy in dental practice.
Conclusion: Different restorations outside the FOV significantly impact VDV in CBCT imaging with both high and low dose protocols.

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