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The identification of possible reference planes on a CBCT scan taken with a small FOV—an observational analytical study Cover

The identification of possible reference planes on a CBCT scan taken with a small FOV—an observational analytical study

Open Access
|Dec 2023

Figures & Tables

Figure 1.

Shows the measurement of the axial inclination of the maxillary central incisor using the palatal plane as reference on the CBCT scan.
Shows the measurement of the axial inclination of the maxillary central incisor using the palatal plane as reference on the CBCT scan.

Figure 2.

Shows the measurement of the inclination of the maxillary first permanent molar using the molar occlusal plane as reference on the CBCT scan.
Shows the measurement of the inclination of the maxillary first permanent molar using the molar occlusal plane as reference on the CBCT scan.

Figure 3.

Shows the Bland–Altman plot to evaluate method of agreement of the various parameters evaluated in the study.
Shows the Bland–Altman plot to evaluate method of agreement of the various parameters evaluated in the study.

Shows the linear regression analysis done after the Bland Altman test depicted in fig 3 and the presence or absence of proportional bias for each of the parameters between CBCT and lateral cephalogram

Unstandardized CoefficientsStandardized Coefficients
ParametersBStd. ErrorBetatSig.R2Standard error of estimate
Change in axial inclination of the maxillary permanent first molar on the right side–0.4870.538–0.243–0.9050.3820.0595.71
Change in angulation of the maxillary central incisor on the right side0.2580.3130.2230.8240.4250.0505.11
Change in axial inclination of the maxillary permanent first molar on the left side–0.0960.613–0.043–0.1560.8780.0026.74
Change in angulation of the maxillary central incisor on the left side0.1430.2470.1590.5800.5720.0254.06

Shows the demographics of the patients included in the study

MaleFemaleTotal
N6915
Mean age (SD) in years22.1717.8919.6
(5.27)(2.76)(4.36)

Showing the comparison treatment change achieved and level of significance when measured with lateral cephalogram and CBCT

Right sideLeft side
NTreatment change (T1-T2)CBCT Mean (SD)Lateral Cephalogram Mean (SD)Difference Mean (SE)95% ClSig. (2- tailed)CBCT Mean (SD)Lateral Cephalogram Mean (SD)Difference Mean (SE)95% ClSig. (2- tailed)
15Change in axial inclination of M1 (°)–2.01 (3.49)–3.20 (4.48)1.19 (1.47)–1.82 –4.190.425–1.68 (4.29)–3.20 (4.48)1.52 (1.60)–1.76 –4.790.350
Change in axial inclination of U1 (°)1.82 (5.49)2.53 (4.52)–.71 (1.84)–4.48 –3.050.7011.72 (5.09)2.53 (4.52)–0.81 (1.76)–4.41 –2.790.650

Showing the comparison of pre-treatment and post-treatment measurements between the CBCT image and cephalogram in the maxillary arch

Pre-distalisation measurements Post-distalisation measurements
NSideParametersCBCT Mean (SD)Lateral Cephalogram Mean (SD)Difference Mean (SE)95% ClSig. (2- tailed)CBCT Mean (SD)Lateral Cephalogram Mean (SD)Difference Mean (SE)95% ClSig. (2- tailed)
15Right sideAxial inclination of U1 (°)118.04 (6.18)120.80 (5.48)–2.76 (2.13)–7.13 –1.610.2061 16.22 (7.77)1 18.27 (4.98)–2.047 (2.38)–6.93 –2.830.398
Axial inclination of M1 (°)80.32 (4.86)90.60 (5.91)–0.28 (1.98)–14.33 –6.230.000*82.33 (5.26)93.80 (6.61)–11.47 (2.18)–15.94 –6.990.000*
Left SideAxial inclination of Ul (°)1 18.96 (6.56)120.80 (5.48)–1.84 (2.21)–6.36 –2.680.41 11 17.23 (6.23)1 18.27 (4.98)–1.03 (2.06)–5.25 –3.180.620
Axial inclination of M1 (°)78.65 (4.73)90.60 (5.91)–11.95 (1.96)–15.96 –7.950.000*80.33 (6.58)93.80 (6.61)–13.47 (2.41)–18.41 –8.540.000*
DOI: https://doi.org/10.2478/aoj-2023-0021 | Journal eISSN: 2207-7480 | Journal ISSN: 2207-7472
Language: English
Page range: 174 - 184
Submitted on: Feb 1, 2023
Accepted on: Sep 1, 2023
Published on: Dec 13, 2023
Published by: Australian Society of Orthodontists Inc.
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year

© 2023 A. Sumathi Felicita, T.N. Uma Maheswari, published by Australian Society of Orthodontists Inc.
This work is licensed under the Creative Commons Attribution 4.0 License.