Korean J Orthod.  2020 Jul;50(4):229-237. 10.4041/kjod.2020.50.4.229.

Construction reproducibility of a composite tooth model composed of an intraoral-scanned crown and a cone-beam computed tomography-scanned root

Affiliations
  • 1Department of Orthodontics, School of Dentistry, Chonnam National University, Gwangju, Korea
  • 2Department of Oral Anatomy, School of Dentistry, Chonnam National University, Gwangju, Korea
  • 3Department of Orthodontics, School of Dentistry, Seoul National University, Seoul, Korea

Abstract


Objective
To evaluate the construction reproducibility of a composite tooth model (CTM) composed of an intraoral-scanned crown and a cone-beam computed tomography (CBCT)-scanned root.
Methods
The study assessed 240 teeth (30 central incisors, 30 canines, 30 second premolars, and 30 first molars in the maxillary and mandibular arches) from 15 young adult patients whose pre-treatment intraoral scan and CBCT were available. Examiner-Reference (3 years’ experience in CTM construction) and Examiners-A and Examiner-B (no experience) constructed the individual CTMs independently by performing the following steps: image acquisition and processing into a three-dimensional model, integration of intraoral-scanned crowns and CBCT-scanned teeth, and replacement of the CBCT-scanned crown with the intraoral-scanned crown. The tooth axis angle in terms of mesiodistal angulation and buccolingual inclination of the CTMs constructed by the three examiners were measured. To assess the construction reproducibility of CTMs, intraclass correlation coefficient (ICC) assessments were performed.
Results
The ICC values of mesiodistal angulation and buccolingual inclination among the 3 examiners showed excellent agreement (0.950–0.992 and 0.965–0.993; 0.976–0.994 and 0.973–0.995 in the maxillary and mandibular arches, respectively).
Conclusions
The CTM showed excellent construction reproducibility in mesiodistal angulation and buccolingual inclination regardless of the construction skill and experience levels of the examiners.

Keyword

Construction reproducibility; Composite tooth model; Intraoralscanned crown; Cone-beam computed tomography-scanned root

Figure

  • Figure 1 Clinical application of the composite tooth model (CTM). The CTMs constructed at the pre-treatment stage by combining cone-beam computed tomography (CBCT) and intraoral scan data can be used for evaluation of the root position at the mid- and post-treatment stages.

  • Figure 2 Evaluation of root position at the mid-treatment stage by superimposing individual composite tooth models onto the mid-treatment intraoral-scanned image using the crown as an index.

  • Figure 3 Study design for evaluation of inter-examiner reliability in construction of individual composite tooth models (CTMs). Examiner-Reference (Examiner-Ref), Examiner-A, and Examiner-B independently constructed the individual CTMs using the intraoral-scanned crown and the cone-beam computed tomography (CBCT)-segmented teeth.

  • Figure 4 Construction procedure of the individual composite tooth models. A, Intraoral-scanned crown. B, Segmented cone-beam computed tomography (CBCT)-scanned teeth. C, Integration of A and B by crown registration. D, Intraoral-scanned crown with CBCT-scanned root. E, Individual composite tooth models. 3D, Three-dimensional.

  • Figure 5 Verification of the integration accuracy. Registration errors were evaluated by measuring the absolute values of the three-dimensional Euclidean distances between the surface points on the two images. CBCT, Cone-beam computed tomography.

  • Figure 6 Measurements of tooth axis angle. The mesiodistal angulation was measured at the distal angle in conjunction with the occlusal plane and the tooth axis plane (upper row). The buccolingual inclination was measured at the lingual angle in conjunction with the occlusal plane and the tooth axis plane (lower row). The green square-shaped plane presents tooth axis planes constructed by two points in the crown and one point in the root apex.


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Mirinae Park, Veerasathpurush Allareddy, Phimon Atsawasuwan, Min Kyeong Lee, Kyungmin Clara Lee
Korean J Orthod. 2023;53(1):26-34.    doi: 10.4041/kjod22.105.


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