Abstract：
:Further insight into human tooth enamel, dense fraction (TE), has been obtained by following the change and loss of CO3(2-), OH-, structurally incorporated H2O, Cl-, and, indirectly, HPO4(2-) after TE had been heated in N2 or vacuum in the range 25-1000 degrees C. Quantitative infrared spectroscopic, lattice parameter, and thermogravimetric measures were used. Loss of the CO3(2-) components begins at much lower temperature (e.g., 100 degrees C) than previously recognized, which has implications for treatments in vitro and possibly in vivo. CO3(2-) in B sites is lost continuously from the outset; the amount in A sites first decreases and then increases above 200 degrees to a maximum at approximately 800 degrees C (greater than 10% of the possible A sites filled), where it is responsible for an increase in a lattice parameter. A substantial fraction of the CO3(2-) in B sites moves to A sites before being evolved, apparently via a CO2 intermediary. This implies an interconnectedness of the A and B sites which may be significant in vivo. No loss of Cl- was observed at temperatures below 700-800 degrees C. Structural OH- content increases approximately 70% to a maximum near 400 degrees C. Structurally incorporated water is lost continuously up to approximately 800 degrees C with a sharp loss at 250-300 degrees C. The "sudden" a lattice parameter contraction, approximately 0.014 A, occurs at a kinetics-dependent temperature in the 250-300 degrees C range and is accompanied by reordering and the "sharp" loss of approximately 1/3 of the structurally incorporated H2O. The hypothesis that structurally incorporated H2O is the principal cause of the enlargement of the a lattice parameter of TE compared to hydroxyapatite (9.44 vs 9.42 A) is thus allowed by these experimental results.
journal_name
Calcif Tissue Intjournal_title
Calcified tissue internationalauthors
Holcomb DW,Young RAdoi
10.1007/BF02407181subject
Has Abstractpub_date
1980-01-01 00:00:00pages
189-201issue
3eissn
0171-967Xissn
1432-0827journal_volume
31pub_type
杂志文章abstract：:The present study was designed to characterize dentin formed in transplanted rat molars by investigating calcium (Ca), phosphorus (P), and magnesium (Mg) concentrations using electron probe microanalysis (EPMA) as well as examining the rate of dentin matrix formation by vital staining. The unerupted immature lower rig...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-005-0134-4
更新日期：2006-03-01 00:00:00
abstract：:Osteonectin, gamma-carboxyglutamic acid-containing (Gla) protein, and dentin phosphoprotein were covalently attached to sepharose beads and inoculated in solutions at two different degrees of supersaturation with respect to both octacalcium phosphate (OCP) and hydroxyapatite. In both solutions, the inhibitory activity...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF00308323
更新日期：1993-02-01 00:00:00
abstract：:We assessed the relationship of bone density and microarchitecture between hand, peripheral, and axial skeletal sites using high-resolution peripheral quantitative computed tomography (HR-pQCT) and dual-energy X-ray absorptiometry (DXA) in patients with rheumatoid arthritis (RA) and which factors influence these param...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-012-9644-z
更新日期：2012-11-01 00:00:00
abstract：:The purpose of this study was to determine the efficacy of using bone mineral measurements of the calcaneus to evaluate osteoporosis. Dual energy X-ray absorptiometry (DXA) of the calcaneus was compared with posteroanterior lumbar absorptiometry (DXA) and vertebral quantitative computed tomography (QCT) measurements i...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF00298738
更新日期：1995-01-01 00:00:00
abstract：:The current studies were intended to determine whether the anabolic effects of calcitonin (CT) on human osteoblast-line cells were (1) unique to osteosarcoma cells or also evident in osteoblast-line cells derived from normal human bone; and/or (2) associated with effects on several insulin-like growth factor (IGF) sys...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s002230001112
更新日期：2000-09-01 00:00:00
abstract：:Long-term use of hydrochlorothiazide (HCTZ), a common diuretic agent for hypertension, has been associated with increased bone density and reduced hip fracture rates in patients. In this study, we sought to examine whether HCTZ has an anabolic effect on the proliferation of human osteoblasts (derived from either verte...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF00369219
更新日期：1996-12-01 00:00:00
abstract：:The aim of this study was to follow the changes in bone mineral density (BMD) and biochemical markers of bone turnover in 10 children (7.5-17.5 years of age) with severe juvenile idiopathic arthritis (JIA), during a 3-year therapy with salmon calcitonin (100 IU/day 2 months on and 2 off for a year and 200 IU/day for 2...
journal_title：Calcified tissue international
pub_type： 临床试验,杂志文章
doi：10.1007/s00223-001-0008-3
更新日期：2001-07-01 00:00:00
abstract：:Osteoporosis is a bone disease leading to an increased fracture risk. It is considered a complex multifactorial genetic disorder with interaction of environmental and genetic factors. As a candidate gene for osteoporosis, we studied vitamin D binding protein (DBP, or group-specific component, Gc), which binds to and t...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-009-9251-9
更新日期：2009-08-01 00:00:00
abstract：:A 69-year-old man became hypocalcemic under medical observation. The hypocalcemia occurred in the presence of circulating immunoreactive parathyroid hormone (PTH). Common causes of secondary hyperparathyroidism were excluded, as was PTH resistance using PTH infusions. The immunoreactive PTH was examined in detail. PTH...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF00298499
更新日期：1992-08-01 00:00:00
abstract：:Data on the association between dietary vitamin K intake and fracture risk are limited among Chinese. This study examined such an association in community-dwelling elderly in Hong Kong. We present data from 2,944 subjects (1,605 men, 1,339 women) who participated in a prospective cohort study. Baseline dietary intakes...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-012-9586-5
更新日期：2012-05-01 00:00:00
abstract：:Extracellular ATP, and to a lesser extent adenosine, an ATP metabolite, stimulated cell proliferation in osteoblast-like cells (MC3T3-E1). ATP increased cytosolic Ca2+ due to Ca2+ mobilization from intracellular storage in the same concentration range of the nucleotide as that effective for DNA synthesis, suggesting t...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF02529732
更新日期：1996-02-01 00:00:00
abstract：:The bone mineral density (BMD) of the spine was measured in the posteroanterior (PA) and lateral projections as well as the total body BMD in 447 black and white women. The lateral projection is comprised predominantly of cancellous bone whereas the total body BMD is predominantly cortical bone, and the PA spine is in...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s002239900653
更新日期：1999-07-01 00:00:00
abstract：:Regular tennis play is associated with impressive asymmetries in bone strength in favor of the racquet arm, particularly in the humerus. However, the relative effects of service and ground strokes are not known. Serendipitously, we encountered a 46-year-old regular tennis player who has played service and ground strok...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-015-9995-3
更新日期：2015-08-01 00:00:00
abstract：:Cortical bone can be modeled as a complex hierarchical composite interrelating both structure and material properties on four levels of structural organization: molecular, ultrastructural, microscopic, and macroscopic. In young animals, the microstructural systems are long parallel lamellar units, plexiform bone, whic...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF02406131
更新日期：1984-01-01 00:00:00
abstract：:We have recently reported that risedronate preserves normal bone formation and decreases bone remodeling in women with postmenopausal osteoporosis after 3 years of treatment. We report now the results of a 2-year extension study. The primary objective of this study was to determine the effect of 5 years of risedronate...
journal_title：Calcified tissue international
pub_type： 临床试验,杂志文章,随机对照试验
doi：10.1007/s00223-004-0039-7
更新日期：2004-12-01 00:00:00
abstract：:The influence of body mass index (BMI) on T scores for total body bone mineral content (TBBMC) and regional bone mineral content (RBMC) was studied in 186 healthy women: 100 postmenopausal, 35 perimenopausal, and 51 premenopausal. The three groups were divided by BMI >25 kg/m2 and BMI <25 kg/m2 and the postmenopausal ...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s002239900310
更新日期：1997-08-01 00:00:00
abstract：:Teriparatide (TPTD) is known to increase the cortical thickness and porosity. The purpose of the present study was to determine whether switching from TPTD to ibandronate (IBN) would be useful for improving cortical bone parameters as assessed using high-resolution quantitative computed tomography (HR-QCT) analyses in...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-016-0180-0
更新日期：2016-11-01 00:00:00
abstract：:Psoriatic arthritis (PsA) is an inflammatory rheumatic disorder that occurs in patients with psoriasis and predominantly affects musculoskeletal structures, skin, and nails. The etiology of PsA is not well understood but evidence supports an interplay of genetic, immunologic, and environmental factors which promote pa...
journal_title：Calcified tissue international
pub_type： 杂志文章,评审
doi：10.1007/s00223-017-0380-2
更新日期：2018-05-01 00:00:00
abstract：:The aim of this study was to determine whether forearm bone mineral density (BMD) measurements are affected by clinical risk factors for osteoporosis to the same extent as spine and hip BMD. The study population consisted of 1,009 female patients and volunteers, of whom 238 were premenopausal. Women were placed into s...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-006-0217-x
更新日期：2007-02-01 00:00:00
abstract：:Osseous tissue develops via two distinctly different processes: endochondral (EC) ossification and intramembranous (IM) ossification. The present study tests the hypothesis that each type of osseous tissue contains unique inducing factors for the promotion of cartilage and bone development. Previous work suggests that...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF02556258
更新日期：1991-11-01 00:00:00
abstract：:Macroporous biphasic calcium phosphate (MBCP) blocks were implanted into rabbit trabecular bone and muscle, recovered 18 weeks later, and then observed and analyzed by transmission electron microscopy (TEM), electron diffraction, and electron microprobes. The results showed that (1) apatitic microcrystals appeared by ...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/pl00005825
更新日期：1999-05-01 00:00:00
abstract：:The metacarpal bone mineral density (BMD) and metacarpal index (MCI) of the second metacarpal bone were measured by computed X-ray densitometry (CXD) (Teijin Ltd., Tokyo), which we have established with the development of microdensitometry of radiographs. In this study, we evaluated the basic attributes of this CXD me...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF00299308
更新日期：1994-11-01 00:00:00
abstract：:To clarify the mechanisms underlying shockwave-induced osteogenesis, we applied shockwave to rat femoral shafts from the ventral side. We assessed bone mineral content (BMC) and bone mineral density (BMD), and analyzed the spatial and temporal gene expression for pro-alpha1 (I) collagen (COL1A1), pro-alpha1 (II) colla...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-003-0043-3
更新日期：2004-02-01 00:00:00
abstract：:The developing mandibular condylar growth center consists of a number of histologically distinct cell types. There is an increase in cell volume that takes place from the condylar surface layer through the center of ossification, resulting in a disorganized, irregular cellular pattern. Consequently, the isolation and ...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/BF00298747
更新日期：1995-01-01 00:00:00
abstract：:We investigated whether polymorphisms in PTHR1 are associated with bone mineral density (BMD), to determine whether the association of this gene with BMD was due to effects on attainment of peak bone mass or effects on subsequent bone loss. The PTHR1 gene, including its 14 exons, their exon-intron boundaries, and 1,50...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-007-9072-7
更新日期：2007-10-01 00:00:00
abstract：:Hip fracture may cause and/or complicate institutionalization. We undertook this study to define its overall prevalence among the residents of four nursing homes in Central Italy as well as its latency and impact on mobility when it occurred within institutions. We also performed a case control analysis with the aim o...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s002230001212
更新日期：2001-06-01 00:00:00
abstract：:The purpose of this work was to extend to long bones the study on the ossification of human fetal skeleton in relation to conceptual age by a quantitative methodological approach. Postero-anterior scans were performed on 29 dried fetal femora (from 11.5 weeks of conceptual age to term) by a Hologic QDR 1000 X-ray dens...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s002239900591
更新日期：1999-02-01 00:00:00
abstract：:Osteoclasts are large, multinucleated, terminally differentiated cells formed by the fusion of mononuclear hemopoietic precursors. Their function is the resorption of bone, which is an essential part of the growth, modeling and remodeling of the skeleton. Though some osteoclast differentiation factors have recently be...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-002-2098-y
更新日期：2003-10-01 00:00:00
abstract：:We conducted a case-control study on fracture risk associated with the use of orally administered prednisolone/prednisone, budesonide, methylprednisolone, and hydrocortisone to assess if the various preparations were associated with different fracture patterns. Cases were all subjects with any fracture sustained durin...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-008-9124-7
更新日期：2008-04-01 00:00:00
abstract：:Aging is associated with an increase in circulating inflammatory factors. One, the cytokine stromal cell-derived factor 1 (SDF-1 or CXCL12), is critical to stem cell mobilization, migration, and homing as well as to bone marrow stem cell (BMSC), osteoblast, and osteoclast function. SDF-1 has pleiotropic roles in bone ...
journal_title：Calcified tissue international
pub_type： 杂志文章
doi：10.1007/s00223-017-0245-8
更新日期：2017-06-01 00:00:00
