Accuracy and reliability of mandibular digital model registration with use of the mucogingival junction as the reference.

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Accuracy and reliability of mandibular digital model registration with use of the mucogingival junction as the reference.

Oral Surg Oral Med Oral Pathol Oral Radiol. 2018 Oct 16;:

Authors: Ioshida M, Muñoz BA, Rios H, Cevidanes L, Aristizabal JF, Rey D, Kim-Berman H, Yatabe M, Benavides E, Alvarez MA, Volk S, Ruellas AC

Abstract
OBJECTIVE: The aim of the study was to validate a method of mandibular digital model (DM) registration, acquired from an intraoral scanner, compared with high-resolution voxel-based cone beam computed tomography (CBCT) registration with use of the mucogingival junction as the reference.
STUDY DESIGN: Pre- and post-treatment CBCT and DM images from 12 adults were randomly selected from an initial sample of 40 patients who had undergone orthodontic treatment. The DM registration was performed in 6 steps: (1) construction of 3-dimensional (3-D) volumetric label maps of CBCT scans, (2) voxel-based registration of CBCT scans, (3) prelabeling of CBCT images, (4) approximation and registration of DM models to the corresponding CBCT models, (5) mucogingival-junction registration of pretreatment and post-treatment DM images, 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 = .267; anterior-posterior P = .238; superior-inferior P = .384; and 3-D P = .076). ICC showed excellent intra- and inter-rater correlation (ICC > 0.90).
CONCLUSIONS: The method of DM registration of the mandible with use of the mucogingival junction as the reference is accurate, reliable, and reproducible.

PMID: 30472195 [PubMed - as supplied by publisher]

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