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Related Concept Videos

Body Planes01:06

Body Planes

Body planes in anatomy are imaginary flat surfaces used as reference points to divide the body into sections for anatomical study. These planes are essential for understanding the orientation, relationships, and spatial organization of anatomical structures.
The sagittal plane is the plane that divides the body or an organ vertically into right and left sides. If this vertical plane runs directly down the middle of the body resulting in equal division, it is called the midsagittal or median...
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
Cranial Bones: Lateral View01:27

Cranial Bones: Lateral View

The lateral view of the cranium is dominated by temporal, sphenoid, and ethmoid bones.
The temporal bone forms the lower lateral side of the skull. The temporal bone is subdivided into several regions. The flattened upper portion is the squamous portion of the temporal bone. Below this area and projecting anteriorly is the zygomatic process of the temporal bone, which forms the posterior portion of the zygomatic arch. Posteriorly is the mastoid portion of the temporal bone. Projecting...
Cranial Bones: Superior and Posterior View01:14

Cranial Bones: Superior and Posterior View

The superior view of the cranium shows the frontal and paired parietal bones.
The frontal bone is the single bone that forms the forehead. At its anterior midline, between the eyebrows, there is a slight depression called the glabella. The frontal bone also forms the supraorbital margin of the orbit. Near the middle of this margin is the supraorbital foramen, the opening that provides passage for a sensory nerve to the forehead. The frontal bone is thickened just above each supraorbital margin,...
Quadric Surfaces01:28

Quadric Surfaces

Quadric surfaces are three-dimensional surfaces characterized by second-degree equations in the variables x, y, and z. These surfaces are smooth and continuous, and specific combinations of squared and linear terms define their shapes. The main types of quadric surfaces include ellipsoids, cones, paraboloids, and hyperboloids. Each type exhibits distinct geometric features depending on how the variables are arranged and related within the equation.Ellipsoids are closed surfaces formed when all...
Three-Dimensional Force System:Problem Solving01:30

Three-Dimensional Force System:Problem Solving

A three-dimensional force system refers to a scenario in which three forces act simultaneously in three different directions. This type of problem is commonly encountered in physics and engineering, where it is necessary to calculate the resultant force on the system, which can then be used to predict or analyze the behavior of the object or structure under consideration.
To solve a three-dimensional force system, first resolve each force into its respective scalar components. Do this using...

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Three-Dimensional Cephalometric Landmark Annotation Demonstration on Human Cone Beam Computed Tomography Scans
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Three-dimensional analysis of biplanar cephalograms.

Min-Ching Wu1, Kuo-Sheng Cheng, Yen-Ting Chen

  • 1Institute of Oral Medicine, National Cheng Kung University, Tainan, Taiwan, Republic of China.

European Journal of Orthodontics
|July 28, 2010
PubMed
Summary
This summary is machine-generated.

Three-dimensional (3D) analysis using biplanar cephalograms offers higher accuracy than traditional two-dimensional (2D) methods for skull measurements. This 3D cephalometric analysis provides more precise spatial information for clinical applications.

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Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography
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Published on: March 12, 2021

Area of Science:

  • Orthodontics and Dentofacial Orthopedics
  • Medical Imaging
  • Biomedical Engineering

Background:

  • Two-dimensional (2D) cephalometric analysis has limitations in accurately representing complex craniofacial structures.
  • Three-dimensional (3D) reconstruction offers potential for improved spatial analysis in orthodontics.
  • Biplanar cephalograms (postero-anterior and lateral) are commonly used in diagnostic imaging.

Purpose of the Study:

  • To reconstruct a 3D skull model using biplanar cephalograms.
  • To perform a 3D cephalometric analysis with orthogonal projection.
  • To compare the accuracy of 3D analysis with conventional 2D analysis.

Main Methods:

  • Landmark identification on a dry skull and computerized tomography (CT) for 3D norm construction.
  • 3D model reconstruction from postero-anterior (PA) and lateral biplanar cephalograms.
  • Comparison of linear measurements between 2D-CT and 3D-CT data using 15 identified landmarks.

Main Results:

  • 3D linear measurements from biplanar cephalograms achieved 98.9% accuracy compared to CT data.
  • 2D linear measurements from cephalograms and CT data showed only 89.2% accuracy.
  • Excluding the gonion-menton measurement, 2D accuracy improved to 95.1%, but 3D analysis remained significantly more accurate (P < 0.05).

Conclusions:

  • Biplanar cephalograms with orthogonal projection enable accurate 3D cephalometric analysis.
  • 3D analysis derived from biplanar cephalograms is superior to 2D analysis for craniofacial measurements.
  • This advanced 3D method enhances diagnostic precision in orthodontics and related fields.