Abstract:
:The dentin-enamel junction (DEJ) plays an important role in preventing crack propagation from enamel into dentin. This function stems from its complex structure and materials properties that are different from either dentin or enamel. The molecular structural differences in both mineral and organic matrix across the DEJ zone were investigated by two-dimensional confocal Raman microspectroscopic mapping/imaging technique. The intensity ratios of 1450 (CH, matrix)/960 (P-O, mineral) decreased gradually to nearly zero across the DEJ. The width of this transition zone was dependent on the intratooth location, with 12.9 +/- 3.2 microm width at occlusal positions and 6.2 +/- 1.3 microm at cervical positions. The difference in width was significant (P < 0.001). Concurrently, spectral differences in both organic and inorganic matrices across the DEJ were also noted. For example, the ratios of 1243 (amide III)/1450 (CH) within the DEJ were lower than the values in dentin; however, the ratios of 1665 (amide I)/1450 (CH) within the DEJ were higher than those values in dentin. In addition, the ratios of 1070 (carbonate)/960 (phosphate) within the dentin were lower than the values in the DEJ. Raman images indicated that the distribution of the above ratios across the DEJ zone were also different at occlusal and cervical positions. The results suggest that the intratooth-location-dependent structure of the DEJ may be related to its function. Micro-Raman spectroscopic/imaging analysis of the DEJ provides a powerful means of identifying the functional width and molecular structural differences across the DEJ.
journal_name
Calcif Tissue Intjournal_title
Calcified tissue internationalauthors
Xu C,Yao X,Walker MP,Wang Ydoi
10.1007/s00223-008-9212-8subject
Has Abstractpub_date
2009-03-01 00:00:00pages
221-8issue
3eissn
0171-967Xissn
1432-0827journal_volume
84pub_type
杂志文章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::In the rat, prolonged administration of the luteinizing, hormone-releasing hormone agonist buserelin (25 micrograms/kg body wt/day s.c.) lowers blood estradiol, raises bone resorption, and induces osteopenia. The present study was undertaken to determine whether withdrawal of buserelin normalizes blood estradiol, slow...
journal_title:Calcified tissue international
pub_type: 杂志文章
doi:10.1007/BF02555819
更新日期:1990-01-01 00:00:00
abstract::The purpose of this study was to determine whether total serum calcium, parathyroid gland structure, and/or levels of parathyroid hormone, 1,25 and 24,25 DHCC, are altered in pigs with dental and skeletal fluorosis. Eight experimental animals receiving 2 mg F-/kg b.w. per day from age 8-14 months were compared with ei...
journal_title:Calcified tissue international
pub_type: 杂志文章
doi:10.1007/BF02556714
更新日期:1986-04-01 00:00:00
abstract::We describe a tall-statured 14-year-old boy who illustrated the full phenotypic and radiographic features of Stickler syndrome type I. A bone biopsy showed evidence of reduced bone mass and bone turnover, such as reduced BV/TV (-43%), TbTh (-29%), and OS/BS (-48%), Ob.S/BS (-27%), and Oc/BS (-47%) compared to "age-mat...
journal_title:Calcified tissue international
pub_type: 杂志文章
doi:10.1007/s00223-009-9324-9
更新日期:2010-02-01 00:00:00
abstract::The association of dietary patterns and bone health is not yet well known, and findings from the rare previous studies conducted on this issue are contradictory. We assessed the dietary patterns in relation to bone mineral density (BMD) in a sample of menopausal Iranian women. In this cross-sectional study, 160 menopa...
journal_title:Calcified tissue international
pub_type: 杂志文章
doi:10.1007/s00223-012-9608-3
更新日期:2012-07-01 00:00:00
abstract::Arterial calcification leading to increased arterial stiffness, a powerful risk factor for cardiovascular disease, may underlie the association of osteoporosis with cardiovascular disease in postmenopausal women. Osteoprotegerin (OPG), an indirect inhibitor of osteoclastogenesis, may be involved in arterial calcificat...
journal_title:Calcified tissue international
pub_type: 杂志文章
doi:10.1007/s00223-008-9153-2
更新日期:2008-08-01 00:00:00
abstract::We investigated the ultrastructural distribution and histochemical properties of sulfated glycoconjugates, which could be preserved by glutaraldehyde fixation, in secretory ameloblasts and developing enamel matrix, by use of the high iron diamine thiocarbohydrazide silver proteinate (HID-TCH-SP) staining and enzymatic...
journal_title:Calcified tissue international
pub_type: 杂志文章
doi:10.1007/BF02556641
更新日期:1988-11-01 00:00:00
abstract::Mechanical forces applied to cultured bone cells induce the production of cAMP via stimulation of the formation of prostaglandin E2 (PGE2) and its release into the medium, resulting in stimulation of adenylate cyclase. In this paper we show that either the antibiotic gentamycin (100 micrograms/ml) or antiphospholipid ...
journal_title:Calcified tissue international
pub_type: 杂志文章
doi:10.1007/BF02553753
更新日期:1988-04-01 00:00:00
abstract::Identifying persons with a high risk of osteoporotic fractures remains a challenge. DXA uptake in women with elevated risk of osteoporosis seems to be depending on distance to scanning facilities. This study aimed to investigate the ability of a small portable scanner in identifying women with reduced bone mineral den...
journal_title:Calcified tissue international
pub_type: 杂志文章,随机对照试验
doi:10.1007/s00223-015-0084-4
更新日期:2016-03-01 00:00:00
abstract::The purpose of this study was to examine the effects of green tea extract (GTE) intake on bone structural and physiological properties, such as bone mass, trabecular bone microarchitecture, cortical bone geometry, and bone mechanical strength, in growing rats. Four-week-old male Wistar rats were divided into the follo...
journal_title:Calcified tissue international
pub_type: 杂志文章
doi:10.1007/s00223-017-0358-0
更新日期:2018-03-01 00:00:00
abstract::Residents of a long-stay geriatric ward at the University Hospital Basel were included in a study to investigate the effects of hypovitaminosis D and immobility. All 91 women (mean age 82.5 years) and 92 men (mean age 78.7 years) were enrolled in the study. Measurements included bone resorption, as measured by urinary...
journal_title:Calcified tissue international
pub_type: 杂志文章
doi:10.1007/s002239900638
更新日期:1999-06-01 00:00:00
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journal_title:Calcified tissue international
pub_type: 杂志文章
doi:10.1007/s00223-009-9237-7
更新日期:2009-05-01 00:00:00
abstract::The low interference with growth expected in child for a cortisol analogue, deflazacort (DFZ), prompted us to verify if DFZ could affect growth less than prednisone (PDN). An interim analysis relative to 27 girls and 38 boys (out of 100 expected) aged 3-12 yrs, after a median period of 14 mo.s is reported. Children wi...
journal_title:Calcified tissue international
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1007/BF02556381
更新日期:1991-04-01 00:00:00
abstract::At 4 and 24 hours after injection of (35S)sulfate, there were 22-67% fewer silver grains on conventionally fixed sections than on sections fixed by cryotechniques. Differences were smaller when (3H) glucosamine was chosen as precursor. The number of silver grains increased between 4 and 24 hours in predentine and in a...
journal_title:Calcified tissue international
pub_type: 杂志文章
doi:10.1007/BF02557834
更新日期:1985-09-01 00:00:00
abstract::To investigate the possible role of calmodulin in the calcium sensitivity of parathyroid adenylate cyclase (AC), the effect of the calmodulin inhibitor trifluoperazine hydrochloride (TFP) on the calcium sensitivity of forskolin-stimulated AC activity was investigated in membranes prepared from normal porcine parathyro...
journal_title:Calcified tissue international
pub_type: 杂志文章
doi:10.1007/BF02556606
更新日期:1986-05-01 00:00:00
abstract::Dual photon absorptiometry (DPA) is currently the most widely used method for noninvasive bone mineral density (BMD) measurement of the axial skeleton. Dual energy X-ray absorptiometry (DEXA) is a recently developed technique that uses an X-ray tube as a photon source; it has demonstrated several significant advantage...
journal_title:Calcified tissue international
pub_type: 杂志文章
doi:10.1007/BF02556250
更新日期:1991-11-01 00:00:00
abstract::We separated osteoclasts from bone and observed the effect of several known and potential mediators of the control of bone resorption on their cytoplasmic motility. We already found that calcitonin (CT), a hormone that inhibits bone resorption, regularly causes complete inhibition of cytoplasmic motility, specific for...
journal_title:Calcified tissue international
pub_type: 杂志文章
doi:10.1007/BF02405095
更新日期:1983-07-01 00:00:00
abstract::The mineral of cortical bones has been studied in newborn, growing, and adult rats and in the calf and cow, using X-ray diffraction and infrared spectroscopy during the thermal decomposition of bones and by microassay of carbonate. The mineral of all the bone samples, regardless of species or age, was found to be a ca...
journal_title:Calcified tissue international
pub_type: 杂志文章
doi:10.1007/BF02563793
更新日期:1987-09-01 00:00:00
abstract::Undesired bone loss around implants is considered to occur mainly because of a stress-shielding phenomenon. Bone surrounding the total knee arthroplasty (TKA) adjusts its mineral density and structure to meet new mechanical demands. Immobilization, in combination with local operative trauma to the bone and soft tissue...
journal_title:Calcified tissue international
pub_type: 临床试验,杂志文章,随机对照试验
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更新日期:2002-12-01 00:00:00
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journal_title:Calcified tissue international
pub_type: 杂志文章
doi:10.1007/BF00316880
更新日期:1992-11-01 00:00:00
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journal_title:Calcified tissue international
pub_type: 杂志文章,评审
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更新日期:2018-04-01 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 ability of 1,25(OH)2D3 and of 24,25(OH)2D3 to prevent or to heal rickets in chicks was evaluated by studies of plasma biochemistry, growth plate histology, bone morphometry and microradiography, and bone mineralization. 1,25(OH)2D3 at a dose of 100 ng/day produced fewest abnormalities compared with vitamin D3-trea...
journal_title:Calcified tissue international
pub_type: 杂志文章
doi:10.1007/BF02405303
更新日期:1984-01-01 00:00:00
abstract::During mechanical unloading, endothelial cells reduce osteogenesis and increase bone resorption. Here we describe the feedback response of endothelial cells to unloaded osteoblasts. Primary endothelial cells, ex vivo mouse aortic rings and chicken egg yolk membranes were incubated with conditioned medium from mouse pr...
journal_title:Calcified tissue international
pub_type: 杂志文章
doi:10.1007/s00223-018-0496-z
更新日期:2019-03-01 00:00:00
abstract::To assess whether vertebral fractures are associated with osteopenia in chronic alcoholic patients, a transversal study was carried out in 76 chronic alcoholic males and 62 age-matched healthy males. Lumbar bone mineral density (BMD) by dual photon absorptiometry and spinal chest X-ray films were done in all patients....
journal_title:Calcified tissue international
pub_type: 杂志文章
doi:10.1007/BF00298430
更新日期:1995-08-01 00:00:00
abstract::Connective tissue diseases, including osteogenesis imperfecta (OI) and Ehlers-Danlos syndrome (EDS), exhibit a high degree of clinical and genetic heterogeneity. We report two sisters with blue sclerae, joint hypermobility and hearing loss. Whole-exome sequencing identified two compound heterozygous ZNF469 loss-of-fun...
journal_title:Calcified tissue international
pub_type: 杂志文章
doi:10.1007/s00223-020-00721-3
更新日期:2020-09-01 00:00:00
abstract::The hypophosphatemic male mouse (Hyp/y), the proposed model for human vitamin D-resistant rickets (VDRR), is characterized by chronic hypophosphatemia, dwarfism, and rachitic and osteomalacic bone lesions. We have reported that treatment of Hyp/y mice with phosphate salts (Pi) heals rickets but does not correct the de...
journal_title:Calcified tissue international
pub_type: 杂志文章
doi:10.1007/BF02411227
更新日期:1982-03-01 00:00:00
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journal_title:Calcified tissue international
pub_type: 杂志文章
doi:10.1007/s002239900278
更新日期:1997-06-01 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::Fourier-transform (FT) Raman spectroscopy was used to characterize the organic and mineral components of biological and synthetic calcium phosphate minerals. Raman spectroscopy provides information on biological minerals that is complimentary to more widely used infrared methodologies as some infrared-inactive vibrati...
journal_title:Calcified tissue international
pub_type: 杂志文章
doi:10.1007/BF00305529
更新日期:1994-05-01 00:00:00