Comparison of conventional lateral cephalograms with corresponding CBCT radiographs

Abstract

PurposeThis study was performed to assess the compatibility of cone beam computed tomography (CBCT) synthesized cephalograms with conventional cephalograms, and to find a method for obtaining normative values for three-dimensional (3D) assessments.Materials and MethodsThe sample group consisted of 10 adults with normal occlusion and well-balanced faces. They were imaged using conventional and CBCT cephalograms. The CBCT cephalograms were synthesized from the CBCT data using OnDemand 3D software. Twenty-one angular and 12 linear measurements from each imaging modality were compared and analyzed using paired-t test.ResultsThe linear measurements between the two imaging modalities were not statistically different (p>0.05) except for the U1 to facial plane distance. The angular measurements between the two imaging modalities were not statistically different (p>0.05) with the exception of the gonial angle, ANB difference, and facial convexity.ConclusionTwo-dimensional cephalometric norms could be readily used for 3D quantitative assessment, if corrected for lateral cephalogram distortion.

Genetic determinants and postorthodontic external apical root resorption in Czech children

“…The next drawback of this study is that the levels of studied proteins were not measured; on the other side, the functional significance of gene variants selected for analysis was previously described and is mostly known. A further limitation of the study is a method employed for determining EARR diagnosis using two‐dimensional orthopantomograms and lateral cephalograms; nevertheless, the testing methods provided sufficient results similar to findings on three‐dimensional images obtained from a cone‐beam computed tomography (CBCT) (Cattaneo et al , ; Park et al , ).…”

Cephalometric Norms in an Omani Adult Population of Arab Descent

“…20,21 With regards to soft tissue parameters, the upper and lower lips were significantly more protrusive in the Omani subjects and the nasolabial angle was significantly more obtuse (P <0.001 each) [ Table 3]. [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]…”

“…[2][3][4]7,8 Therefore, the present study aimed to establish cephalometric standards for an Omani population of Arab descent and compare these with Eastman Standard norms. [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] Methods This cross-sectional study was conducted at the Military Dental Centre and Oman Dental College in Muscat, Oman, from May 2014 to October 2016. A sample of 150 Omani patients aged 20-29 years old seeking orthodontic treatment at these two institutions were selected.…”

“…A one-sample t-test was used for comparison between published Eastman Standard values and those of the current study. [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] The level of statistical significance was set at P <0.050.…”

Comparison of linear measurements between CBCT orthogonally synthesized cephalograms and conventional cephalograms

“…Some investigators advocated the use of synthesized cephalometric images from CBCT as the bridge for the analysis in the transitional period from 2D to 3D. [10][11][12][13][14][15][16][17][18] There are two fundamental projection methods to create 2D images from CBCT data: orthogonal projection and perspective projection. 11 Orthogonal projection has a centre of projection (focus) at an infinite distance from the plane of projection, thus simulating parallel rays, whereas perspective projection sets the focus at a finite distance from the plane of projection, simulating the geometry of the conventional cephalometric radiographs.…”