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. 2019 Sep;48(6):20180330.
doi: 10.1259/dmfr.20180330. Epub 2019 Mar 28.

Influence of cone beam CT volume orientation on alveolar bone measurements in patients with different facial profiles

Eliana Dantas Costa  1 , Priscila Dias Peyneau  1 , Glaucia Maria Bovi Ambrosano  2 , Matheus Lima Oliveira  1
Affiliations
Free PMC article

Influence of cone beam CT volume orientation on alveolar bone measurements in patients with different facial profiles

Eliana Dantas Costa et al. Dentomaxillofac Radiol. 2019 Sep.
Free PMC article

Abstract

Objectives: To evaluate the influence of cone beam CT (CBCT) volume orientation on alveolar bone measurements for dental implant planning using CBCT in patients with different facial profiles.

Methods: 74 CBCT volumes were selected from a database and classified according to the facial profile of the patient. Height and width measurements of the alveolar bone were carried out with the volume of the mandible in two different orientations: occlusal plane and mandibular base parallel to the horizontal plane. The data were subjected to the mixed model methodology for repeated measures, through the PROC MIXED procedure. Multiple comparisons were performed by Tukey Kramer test (α = 0.05).

Results: Alveolar bone width was significantly greater when the CBCT volume was oriented with the mandibular base parallel to the horizontal plane, for all facial profiles (p ≤ 0.05). Alveolar bone height was significantly higher (p ≤ 0.05) for dolichofacial individuals when compared to that of mesofacial and brachyfacial individuals, who did not differ significantly between each other (p > 0.05), regardless of the CBCT volume orientations used in this study.

Conclusions: CBCT-based alveolar bone width is increased when the image volume is oriented with the mandibular base parallel to the horizontal plane and dolichofacial individuals present greater alveolar bone height.

Keywords: cone-beam CT; dental implants; mandible; patient positioning..

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Figures

Figure 1.
Figure 1.
Sagittal maximum intensity projection and cross-sectional CBCT images of the skull with the occlusal plane (A, B) and base of the mandible (C, D) parallel to the horizontal plane. The dashed lines illustrate the region where the cross-sections were generated for measurement. B, buccal; CBCT, cone beam CT; L, lingual.
Figure 2.
Figure 2.
Schematic drawing of the mandibular body (cylinder) and canal (central solid line) at two different orientations, and the spatial relationship between them. The equation includes the resulting distance for each orientation (x and y) and follows elementary definitions of the Pythagorean trigonometric identity.
See this image and copyright information in PMC

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