Comparison of linear and volumetric measurements obtained from periodontal defects by using cone beam-CT and micro-CT: an in vitro study

Abstract

Objectives

To assess linear and volumetric measurement accuracy of periodontal defects (class 2 furcation, fenestration, dehiscence, and three-wall intrabony defect) by using CBCT and micro-CT images obtained at different voxel sizes.

Material and methods

We created 66 periodontal defects in human dry mandibles. Images of teeth with defects were taken by Planmeca Promox 3D Max (CBCT) at voxel sizes of 0.2 and 0.075 mm and super-argus PET/CT (micro-CT) at voxel sizes of 0.12 and 0.06 mm. All defects were then linearly (depth, width, and height) and volumetrically measured by 3D-DOCTOR software. Differences between voxels were assessed by Wilcoxon signed rank test. Bland-Altman limits of agreement and ICCs were calculated to assess agreement between the methods. Significance was set at p < 0.05.

Results

Volumes measured by micro-CT (0.12–0.06 mm) were higher than those of CBCT (0.2–0.075 mm) measurements regardless of the voxel size. ICC between micro CT and CBCT methods was found to be statistically significant for all types of defects in terms of volume (p < 0.001), height (p < 0.05), width (p < 0.001), and depth measurements (p < 0.001).

Conclusion

CBCT provides useful information regarding linear and volumetric measurement of periodontal defects in vitro.

Clinical relevance

Size and volume of periodontal defects may play an important role in the determination of the most appropriate treatment plan and disease prognosis along with outcome assessment.

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