Korean J Orthod.  2017 Nov;47(6):394-400. 10.4041/kjod.2017.47.6.394.

Three-dimensional structural analysis of the morphological condition of the alveolar bone before and after orthodontic treatment

Affiliations
  • 1Division of Oral Health Sciences, Department of Orofacial Development and Function, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan. y.shimizu.orts@tmd.ac.jp

Abstract

Assessing the condition of the alveolar bone before and after orthodontic treatment is important. Recently, cone-beam computed tomography has been widely accepted as a useful tool for orthodontic treatment. Moreover, using a three-dimensional (3D) structural analysis software enables gathering detailed information and quantifying data. The aim of this study was to introduce various quantitative analyses performed before and after orthodontic treatment by using a 3D structural analysis software for evaluating the morphological condition of the alveolar bone of a patient with gingival recession around the canines.

Keyword

Computed tomography; Three-dimensional structural analysis; Alveolar bone

MeSH Terms

Cone-Beam Computed Tomography
Gingival Recession
Humans

Figure

  • Figure 1 A, Pretreatment frontal/lateral profiles of the patient aged 60 years and 1 month. B, Pretreatment intraoral photographs.

  • Figure 2 A, Posttreatment frontal/lateral profiles of the patient aged 62 years and 9 months. B, Posttreatment intraoral photographs.

  • Figure 3 A, Cortical bone surrounding the lower canine (red area). B, Three-dimensional reconstructed images of the cortical bone surrounding the canines. C, The bone volume before treatment, bone volume per tissue volume (BV/TV), and connectivity of the cortical bones before/after treatment. Blue bar, before treatment; red bar, after treatment. D, Diagram of “connectivity,” which is defined as the average volume from the point in the trabecular bone to the end of the trabecular bone in all directions. The shaded area, bone; P, a point. UL, Upper left; UR, upper right; LL, lower left; LR, lower right; M, medial; D, distal.

  • Figure 4 A, Trabecular bone surrounding the lower canine (red area). B, Three-dimensional reconstructed images of the trabecular bone surrounding the canines. C, The bone volume per tissue volume (BV/TV), trabecular thickness (Tb.Th, mm), trabecular number (Tb.N, per mm), marrow space star volume (Vm, mm3), and trabecular star volume (Vtr, mm3) before/after treatment, and a diagram of those parameters. Blue bar, before treatment; red bar, after treatment. D, Diagram of Tb.Th and Tb.N. E, Diagram of Vm. F, Diagram of Vtr. The shaded area, bone; P, a point. UL, Upper left; UR, upper right; LL, lower left; LR, lower right; M, medial; D, distal.


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