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The bones of the human skeletal system are of varied shapes, sizes, and functions. They can be classified based on their shape and function into four major classes: long bones, short bones, flat bones, and irregular bones. Some classifications include a fifth type, the sesamoid bones, as a separate class, whereas others categorize them under short bones.
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The Hyoid Bone01:12

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The hyoid bone is a small U-shaped bone located in the upper neck at the level of the inferior mandible, with its tips pointing posteriorly. It does not directly articulate with any other bone in the body. The hyoid acts as the attachment site for the tongue, the larynx, and the pharynx. It is held in position by a series of small muscles attached from above or below. These muscles help to move the hyoid up/down or forward/back in coordination with movements of the tongue, larynx, and pharynx...
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Chondrocytes form a temporary cartilaginous model by dividing and secreting a thick gel-like extracellular matrix. Once the chondrocytes undergo programmed cell death, osteoblasts enter the site of the cartilaginous model. The process of replacing the temporary cartilaginous model with bone in an ordered manner is called endochondral ossification. In endochondral ossification, not all of the cartilage is replaced by bone tissue. Some cartilage that performs a protective and supportive function...
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Joints, also known as articulations, are classified based on their structural characteristics, i.e., based on whether the articulating surfaces of the adjacent bones are directly connected by fibrous connective tissue or cartilage, or whether the articulating surfaces contact each other within a fluid-filled joint cavity. These differences serve to divide the joints of the body into three structural classifications.
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A Morphometric and Cellular Analysis Method for the Murine Mandibular Condyle
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No differences in morphological characteristics between hyperplastic condyle and class III condyle.

D R Goulart1, P Muñoz2, S Olate3

  • 1Division of Oral and Maxillofacial Surgery, State University of Campinas, São Paulo, Brazil.

International Journal of Oral and Maxillofacial Surgery
|June 27, 2015
PubMed
Summary
This summary is machine-generated.

Unilateral condylar hyperplasia (UCH) patients show distinct condylar differences compared to their unaffected side. Their condylar morphology resembles Class III skeletal patients, suggesting a potential link between UCH and Class III development.

Keywords:
condylar hyperplasiafacial asymmetrymandibular condyle

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Area of Science:

  • Dentistry
  • Orthodontics
  • Oral and Maxillofacial Surgery

Background:

  • Facial asymmetry and skeletal discrepancies are common in orthodontic and surgical patient populations.
  • Unilateral condylar hyperplasia (UCH) is a condition characterized by asymmetric growth of the mandibular condyle.
  • Class III skeletal relationships often involve mandibular prognathism and present with facial asymmetry.

Purpose of the Study:

  • To compare the condylar morphology of patients with unilateral condylar hyperplasia (UCH) and those with a Class III skeletal relationship.
  • To investigate the potential association between UCH and the development of Class III malocclusions.
  • To utilize cone-beam computed tomography (CBCT) for detailed analysis of condylar dimensions.

Main Methods:

  • A prospective study involving 15 patients with UCH and 15 patients with Class III skeletal relationships.
  • Cone-beam computed tomography (CBCT) was used to capture detailed images of the mandibular condyles.
  • Linear measurements of condylar processes (anteroposterior and mediolateral diameters, condylar neck length, ramus height) were analyzed using Ez3D Viewer Plus software.
  • Statistical analysis included Analysis of Variance (ANOVA) and paired t-tests (P<0.05).

Main Results:

  • Patients with UCH exhibited significant differences in condylar dimensions between the hyperplastic and non-hyperplastic sides.
  • The condylar morphology in Class III patients showed no significant differences between the right and left sides.
  • Condyles in Class III patients were morphologically similar to the hyperplastic condyles in UCH patients but differed significantly from non-hyperplastic condyles.

Conclusions:

  • The condylar morphology observed in UCH patients may contribute to the development of a Class III skeletal relationship.
  • These findings suggest that some patients with Class III malocclusions might present with underlying bilateral condylar hyperplasia.
  • CBCT analysis provides valuable insights into the morphologic characteristics of condylar abnormalities in relation to skeletal discrepancies.