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Tooth Anatomy01:21

Tooth Anatomy

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The human tooth enables us to eat a variety of foods, speak clearly, and even aid in shaping our faces. Teeth are composed of various elements that work together. Here's a detailed look at the anatomy of a human tooth.
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or...
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Structural Joints: Fibrous Joints01:03

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Fibrous joints are a type of joint where the bones are connected by fibrous connective tissue. These joints provide stability and minimal to no movement between the articulating bones. There are three types of fibrous joints.
Suture
All the bones of the skull, except for the mandible, are joined to each other by a fibrous joint called a suture. The fibrous connective tissue found at a suture strongly unites the adjacent skull bones and thus helps to protect the brain and form the face. In...
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Blood and Nerve Supply to the Bones01:29

Blood and Nerve Supply to the Bones

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Bones are dynamic organs that require a rich supply of oxygen and nutrients. Around 5% to 10% of the cardiac output supplies blood to the bones. A typical long bone has three main sources: the nutrient artery, the metaphyseal and epiphyseal arteries, and the periosteal arteries.
Nutrient Artery
The nutrient artery is the main blood vessel that enters the diaphysis via the nutrient foramen. While most long bones have only one nutrient foramen, large bones, such as the femur, may have two. This...
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Cranial Bones: Lateral View01:27

Cranial Bones: Lateral View

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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...
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Structural Joints: Cartilaginous Joints01:17

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As the name indicates, at a cartilaginous joint, the adjacent bones are united by cartilage, a tough but flexible type of connective tissue. Unlike synovial joints, these types of joints lack a joint cavity and involve bones joined together by either hyaline cartilage or fibrocartilage.
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Cranial Bones: Superior and Posterior View01:14

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The superior view of the cranium shows the frontal and paired parietal bones.
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Temporomandibular Joint Pain Measurement by Bite Force and Von Frey Filament Assays in Mice
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The Longitudinal Relationship between Jaw Catching/Locking and Pain.

A Ilgunas1,2, B Häggman-Henrikson1,2, C M Visscher3

  • 1Department of Odontology/Clinical Oral Physiology, Faculty of Medicine, University of Umeå, Umeå, Sweden.

Journal of Dental Research
|March 20, 2023
PubMed
Summary
This summary is machine-generated.

Jaw catching and locking are more common in women than men, with higher incidence and persistence rates. These jaw dysfunctions often develop independently of orofacial pain.

Keywords:
cohort studiesdentistryepidemiologyfacial painpopulation healthtemporomandibular joint disorders

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Area of Science:

  • Temporomandibular joint disorders
  • Orofacial pain research
  • Epidemiology of jaw dysfunction

Background:

  • Orofacial pain and jaw dysfunction significantly impair daily activities.
  • Limited understanding exists regarding the development and natural progression of jaw catching/locking and its link to orofacial pain.

Purpose of the Study:

  • To determine the incidence, prevalence, and gender disparities in jaw catching/locking over time.
  • To investigate the relationship between jaw catching/locking and the onset and course of orofacial pain in the general population.

Main Methods:

  • Utilized data from validated screening questions on orofacial pain and jaw catching/locking.
  • Collected data from routine dental checkups in Sweden between 2010 and 2017.
  • Employed logistic generalized estimating equations and Poisson regression for statistical analysis.

Main Results:

  • Prevalence of jaw catching/locking was higher in women (3.2%) than men (1.5%) in 2010, a disparity sustained throughout the study.
  • Annual incidence rates were 1.1% for women and 0.5% for men.
  • Women exhibited a 2.3 times higher risk for both the initial onset and persistent occurrence of jaw catching/locking compared to men.

Conclusions:

  • Gender differences observed in orofacial pain are also apparent in jaw catching/locking, with women experiencing higher incidence, prevalence, and persistence.
  • The onset of jaw catching/locking and orofacial pain frequently occurs independently, suggesting distinct pathophysiological mechanisms.