Comparison of mandibular index values determined from standard panoramic versus CBCT reconstructed images

Publication date: Available online 19 October 2018

Source: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology

Author(s): Cansu Koseoglu Secgin, Ayse Gulsahi, Yasemin Yavuz, Kivanc Kamburoglu

Abstract

Objectives

To compare the mandibular index values including mandibular cortical index (MCI), mental index(MI), and panoramic mandibular index (PMI) determined from cone-beam computed tomography(CBCT) and panoramic images.

Study design

Panoramic and CBCT images of 182 patients were retrospectively analyzed. Cross-sectional (CS) and panoramic reconstructed (PR) images were obtained from CBCT data. The MCI, MI, and PMI were assessed on CS, PR, and panoramic images and evaluated for intra- and interobserver agreement by kappa or intraclass correlation coefficient (ICC) analysis. Agreement among measurement methods was assessed by Bland–Altman analysis, with CS images as the gold standard for linear measurements.

Results

Measurements from PR and CS images agreed with those from panoramic images in 66.7% and 53.8% of C3 classifications of MCI (porous cortices forming many endosteal residues), respectively. Panoramic and CBCT images exhibited good agreement in MI findings (ICC, 0.91) and moderate (PR and panoramic images: ICC, 0.79) to good (CS and panoramic images: ICC, 0.87) agreement in PMI findings.

Conclusions

Because of the overlapping of buccal and lingual cortices, panoramic images are especially inadequate for determining the C3 category of MCI. However, CS images obtained from available CBCT data provide better visibility than panoramic images and can, therefore, be used for evaluating mandibular indices.

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