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Title: Mineral density volume gradients in normal and diseased human tissues

Journal Article · · PLoS ONE
 [1];  [2];  [2];  [2];  [1];  [2];  [2];  [3];  [1];  [4]
  1. University of San Francisco, San Francisco, CA (United States)
  2. XradiaInc., Pleasanton, CA (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Harvard Medical School, Cambridge, MA (United States)

Clinical computed tomography provides a single mineral density (MD) value for heterogeneous calcified tissues containing early and late stage pathologic formations. The novel aspect of this study is that, it extends current quantitative methods of mapping mineral density gradients to three dimensions, discretizes early and late mineralized stages, identifies elemental distribution in discretized volumes, and correlates measured MD with respective calcium (Ca) to phosphorus (P) and Ca to zinc (Zn) elemental ratios. To accomplish this, MD variations identified using polychromatic radiation from a high resolution micro-computed tomography (micro-CT) benchtop unit were correlated with elemental mapping obtained from a microprobe X-ray fluorescence (XRF) using synchrotron monochromatic radiation. Digital segmentation of tomograms from normal and diseased tissues (N=5 per group; 40-60 year old males) contained significant mineral density variations (enamel: 2820-3095mg/cc, bone: 570-1415mg/cc, cementum: 1240-1340mg/cc, dentin: 1480-1590mg/cc, cementum affected by periodontitis: 1100-1220mg/cc, hypomineralized carious dentin: 345-1450mg/cc, hypermineralized carious dentin: 1815-2740mg/cc, and dental calculus: 1290-1770mg/cc). A plausible linear correlation between segmented MD volumes and elemental ratios within these volumes was established, and Ca/P ratios for dentin (1.49), hypomineralized dentin (0.32-0.46), cementum (1.51), and bone (1.68) were observed. Furthermore, varying Ca/Zn ratios were distinguished in adapted compared to normal tissues, such as in bone (855-2765) and in cementum (595-990), highlighting Zn as an influential element in prompting observed adaptive properties. Hence, results provide insights on mineral density gradients with elemental concentrations and elemental footprints that in turn could aid in elucidating mechanistic processes for pathologic formations.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1201659
Journal Information:
PLoS ONE, Vol. 10, Issue 4; Conference: Naples (Italy), 3-5 Jun 2014; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 50 works
Citation information provided by
Web of Science

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Cited By (9)

Inhibition of Notch Signaling During Mouse Incisor Renewal Leads to Enamel Defects: NOTCH SIGNALING AND ENAMEL FORMATION journal August 2015
Incremental distribution of strontium and zinc in great ape and fossil hominin cementum using synchrotron X-ray fluorescence mapping text January 2018
Microstructured and Degradable Bacterial Cellulose–Gelatin Composite Membranes: Mineralization Aspects and Biomedical Relevance journal February 2019
Microscopic dual-energy CT (microDECT): a flexible tool for multichannel ex vivo 3D imaging of biological specimens: MICROSCOPIC DUAL-ENERGY CT journal March 2017
Pharmacological rescue of diabetic skeletal stem cell niches journal January 2017
A large pool of actively cycling progenitors orchestrates self-renewal and injury repair of an ectodermal appendage journal September 2019
Incremental distribution of strontium and zinc in great ape and fossil hominin cementum using synchrotron X-ray fluorescence mapping journal January 2018
X-ray microtomography assessment of Carisolv and Papacarie effect on dentin mineral density and amount of removed tissue journal November 2017
A large pool of actively cycling progenitors orchestrates self-renewal and injury repair of an ectodermal appendage. text January 2019

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