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Related Concept Videos

Spongy Bone01:09

Spongy Bone

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All bones comprise an outer layer of compact bone, and an interior made up of spongy bone tissue, also called cancellous or trabecular bone. In long bones, spongy bone tissue is mainly found in the interior of the epiphyses (broad ends of the bone).
Spongy bone is more porous, and less dense compared to compact bone. It is composed of concentric lamellae that are arranged irregularly to form the trabecular network. In some bones, the spaces between trabeculae contain red marrow, where...
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Compact Bone01:27

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Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
Compact bone, also called cortical bone, is the denser, stronger of the two types of bone tissue. It is found under the periosteum and in the diaphyses of long bones, where it provides support and protection. The microscopic structural unit of compact bone is called an osteon, or haversian system. Each osteon is composed of concentric rings of calcified...
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Bone Disorders01:29

Bone Disorders

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Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
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The Hyoid Bone01:12

The Hyoid Bone

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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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Bone Structure01:55

Bone Structure

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Within the skeletal system, the structure of a bone, or osseous tissue, can be exemplified in a long bone, like the femur, where there are two types of osseous tissue: cortical and cancellous.
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Bone Remodeling01:40

Bone Remodeling

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Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
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Related Experiment Video

Updated: Jan 22, 2026

Modeling Primary Bone Tumors and Bone Metastasis with Solid Tumor Graft Implantation into Bone
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Bone Density and Implant Primary Stability. A Study on Equine Bone Blocks.

Francesco Orlando1, Federico Arosio1, Paolo Arosio2

  • 1Dental School, University of Milan, 20132 Milan, Italy.

Dentistry Journal
|July 4, 2019
PubMed
Summary

A novel probe accurately measures bone density and primary implant stability using the integral of torque-depth curves. Equine bone blocks show promise for replicating human cancellous bone properties in dental implant research.

Keywords:
bone densityequine bone blocksimplant stability

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Area of Science:

  • Biomaterials Science
  • Dental Implantology
  • Orthopedic Biomechanics

Background:

  • Bone density measurement is crucial for dental implant success.
  • Primary implant stability is a key predictor of osseointegration.
  • Previous studies utilized synthetic bone blocks, necessitating validation with natural bone models.

Purpose of the Study:

  • To validate a rotating probe for measuring bone density in equine bone blocks.
  • To assess the integral of the torque-depth curve (I) as a measure of primary implant stability.
  • To compare equine bone blocks with synthetic models for biomechanical property replication.

Main Methods:

  • Fifteen cancellous equine bone blocks were used to measure density with a probe and compare it to physical density via linear regression.
  • Implant placement was performed in six blocks, measuring primary stability using (I), insertion torque (IT), implant stability quotient (ISQ), and reverse torque (RT).
  • Correlation analysis investigated the relationships between (I), IT, ISQ, and RT.

Main Results:

  • Probe-measured bone density showed significant correlation with actual density (r=0.764 without irrigation, r=0.977 with irrigation).
  • (I) significantly correlated with IT and RT across all irrigation conditions.
  • (I) demonstrated a significant correlation with ISQ specifically without irrigation (r=0.886).

Conclusions:

  • The rotating probe accurately measures bone density.
  • The integral (I) effectively measures primary implant stability and is more sensitive to bone density variations than IT, RT, and ISQ.
  • Equine bone blocks may offer a more accurate mechanical representation of human cancellous alveolar bone compared to synthetic models.