Accuracy and Reliability of Mandibular Digital Model Registration Using the Mucogingival Junction as a Reference

Publication date: Available online 16 October 2018

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

Author(s): Marcos Ioshida, Brian Andres Muñoz, Hector Rios, Lucia Cevidanes, Juan Fernando Aristizabal, Diego Rey, Hera Kim-Berman, Marilia Yatabe, Erika Benavides, Maria Antonia Alvarez, Sarah Volk, Antonio C. Ruellas

Abstract

Objective

To validate a method of mandibular digital model (DM) registration, acquired from an intraoral scanner, compared to high-resolution voxel-based cone beam computed tomography (CBCT) registration using the mucogingival junction as a reference.

Materials and Methods

Pre- and post-treatment CBCTs and DMs of 12 adults were randomly selected from an initial sample of 40 patients who underwent orthodontic treatment. The DM registration was performed in six steps: (1) construction of 3D volumetric label maps of CBCT scans; (2) voxel-based registration of CBCT scans; (3) pre-labeling of CBCT; (4) approximation and registration of DM to the corresponding CBCT models; (5) mucogingival-junction registration between pre-treatment and post-treatment DM; and (6) measurements. The Mann-Whitney U test was used to calculate the significance of differences between the CBCT and DM registrations. The intraclass correlation coefficient (ICC) was performed to assess reproducibility of the registration method.

Results

When registered CBCT models and registered DM models were compared, no statistically significant differences in the measurements were found (right-left p=0.267; anterior-posterior p=0.238; superior-inferior p=0.384; and 3D p=0.076). ICC showed excellent intra- and inter-rater correlation (ICC>0.90).

Conclusion

The method of digital model registration of the mandible using the mucogingival junction as a reference is accurate, reliable, and reproducible.

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