Abstract:
:Dissolution of mercury from the Ag-Hg matrix phase of dental amalgam is distilled water and synthetic saliva, and the mercury evaporation from the solutions, were studied in vitro. The main objectives of the study were to evaluate the factors that affect the results of the mercury release tests, and to consider the possible mechanisms of the release in vivo. Specimens were exposed to the liquids in open or closed bottles, and the changes in the mercury concentration were determined by cold-vapor Atomic Absorption Spectrophotometry. Concentration vs. time tests showed the dissolution rate decreasing with time. Tests involving sequences of short and long exposures with solution changes showed higher average rates for short-term dissolution into the fresh solution than for the longer preceding exposures. The differences were attributed to a stifling effect of the concentration of elemental mercury on the dissolution. It is believed that mercury dissolved mainly in the elemental form and that a continuous increase in the concentration was made possible by oxidation in the solution. In open cells, some of the mercury was lost by evaporation. The analysis showed that the results of mercury dissolution tests depend on many test variables, such as time, solution volume, oxidation and evaporation conditions, etc. Evaporation, dissolution, and evaporation/dissolution mechanisms of the mercury release in vivo were considered. It was concluded that the dissolution/evaporation model best described the mercury release from dental amalgam restorations.
journal_name
J Dent Resjournal_title
Journal of dental researchauthors
Marek Mdoi
10.1177/00220345900690050901subject
Has Abstractpub_date
1990-05-01 00:00:00pages
1167-74issue
5eissn
0022-0345issn
1544-0591journal_volume
69pub_type
杂志文章abstract::The dentition in zebrafish is extremely and richly vascularized, but the function of the vasculature, in view of the continuous replacement of the teeth, remains elusive. Through application of SU5416, a vascular endothelial growth factor receptor inhibitor, we studied the role of the blood vessels in the dentition of...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/0022034514557156
更新日期:2015-01-01 00:00:00
abstract::Periodontitis is a complex, multifactorial chronic disease involving continuous interactions among bacteria, host immune/inflammatory responses, and modifying genetic and environmental factors. More than any other cytokine family, the interleukin (IL)-1 family includes key signaling molecules that trigger and perpetua...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/0022034520945209
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abstract::Numerous studies have demonstrated that many older adults have problems chewing, pain, difficulties in eating, and problems in social relationships because of oral disorders. However, it is not clear if these functional and psychosocial outcomes affect broader psychological well-being and life satisfaction. Consequent...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/00220345000790041301
更新日期:2000-04-01 00:00:00
abstract::Experimental marginal leakage of high- and low-Cu amalgam restorations placed in acrylic teeth, where the cavities were untreated or painted with denatured collagen and/or a CaP slurry, was assessed after specimens were stored in a 1% NaCl solution for ten days and for one yr. All specimens stored for ten days showed ...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/00220345840630081801
更新日期:1984-08-01 00:00:00
abstract::Oral bacteria, including Streptococcus mutans and Streptococcus salivarius, contribute to tooth decay and plaque formation; therefore, it is essential to develop strategies to prevent dental caries and plaque formation. We recently showed that organo-selenium compounds covalently attached to different biomaterials inh...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/0022034513482141
更新日期:2013-05-01 00:00:00
abstract::The purpose of this work was to determine the influence of chemical food-simulating liquids on the wear of various commercial dental composite restoratives. In many cases, pre-conditioning the restoratives in these liquids for one week produced swelling of the polymer matrix and considerable surface damage. The result...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/00220345850640111601
更新日期:1985-11-01 00:00:00
abstract::The universally accepted concept of delay-loaded dental implants has recently been challenged. This study hypothesizes that early loading (decreased implant healing time) leads to increased bone formation and decreased crestal bone loss. We used 17 minipigs to study implants under a controlled load, with non-loaded im...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/154405910308200803
更新日期:2003-08-01 00:00:00
abstract::Vietnamese immigrant and Norwegian children, matched according to caries experience, age, and sex, were compared with respect to S. mutans in dental plaque and in saliva. Regardless of ethnic group, S. mutans prevalence was highest in plaque over caries lesions and from fissures, and lowest in plaque from smooth surfa...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/00220345840630120801
更新日期:1984-12-01 00:00:00
abstract::Based on the existing evidence supporting a state of chronic inflammation in chronic kidney disease (CKD), we hypothesized that periodontal infection may affect the systemic inflammatory status of a nationally representative CKD population as measured by serum C-reactive protein (CRP). We examined this hypothesis usin...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/0022034511423394
更新日期:2011-12-01 00:00:00
abstract::Various etching methods are examined with respect to their ability to induce the surface nucleation and growth of fluorapatite from solutions of low, sustained supersaturation with respect to hydroxyapatite and fluorapatite. The constant composition kinetics method enables the rates of remineralization to be precisely...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/00220345820610091301
更新日期:1982-09-01 00:00:00
abstract::The temporal and spatial patterns in which teeth are initiated in the growing jaws of embryos are constant for a species but different for different species. The sources of the patterns have been explained in two ways. First, they are the outcome of reactions between molecules created at stationary targets and those w...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/00220345980770090901
更新日期:1998-09-01 00:00:00
abstract::The balance between bone resorption and bone formation is vital for maintenance and regeneration of alveolar bone and supporting structures around teeth and dental implants. Tissue regeneration in the oral cavity is regulated by multiple cell types, signaling mechanisms, and matrix interactions. A goal for periodontal...
journal_title:Journal of dental research
pub_type: 杂志文章,评审
doi:10.1177/0022034515618887
更新日期:2016-03-01 00:00:00
abstract::The purpose of this investigation was to determine the water sorption and solubility, as well as the filler composition and extent of chemical degradation in water, of eight different posterior composites. With one exception, the materials with the largest quantity of fillers had the least water sorption and solubilit...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/00220345860650110601
更新日期:1986-11-01 00:00:00
abstract::Significant inhibition of PMN metabolic activity by F- occurred at 0.1, 0.5 and 0.0 mM F- for O2- generation, 1-C14 CO2 release labeled glucose and NBT-reduction respectively. This inhibition resulted primarily from F- suppression of nonoxidative glucose metabolism. As the concentration of F- in the O2- generating sys...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/00220345790580092101
更新日期:1979-09-01 00:00:00
abstract::Although the occlusal vertical dimension (OVD) is strictly controlled, the neuronal mechanism of its regulation is still unclear. We hypothesize that neurons in the trigeminal mesencephalic nucleus (MesV) play an important role in the regulation of the OVD, because the MesV receives the projection from jaw-closing mus...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/154405910308200715
更新日期:2003-07-01 00:00:00
abstract::Stable fluoride-resistant mutants of Streptococcus mutans GS-5 were isolated on Todd-Hewitt agar by a step-wise selection procedure. Resistance is defined here as the ability to form colonies in 48 hr. First-step mutants demonstrated six different levels of resistance, ranging from 400 to 1000 micrograms/mL sodium flu...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/00220345870660101701
更新日期:1987-10-01 00:00:00
abstract::Since edentate subjects have a reduced masticatory function, it can be expected that the morphology of the cancellous bone of their mandibular condyles has changed according to the altered mechanical environment. In the present study, the morphology of cylindrical cancellous bone specimens of the mandibular condyles o...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/154405910408300314
更新日期:2004-03-01 00:00:00
abstract::The effect of toothbrushes on soft tissue abrasion was measured using hamster cheek pouch tissue brushed mechanically for various intervals. The detection of protein removed during brushing was used as an index of tissue abrasion. The method was found to be sensitive in detecting the effects of brush load, number of s...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/00220345770560070301
更新日期:1977-07-01 00:00:00
abstract::In a previous experiment, we found that masseter muscle spindles show functional plasticity after 5 to 15 days under increased occlusal vertical dimension (iOVD). In the present study, we hypothesized that spindle function would eventually recover if longer observation periods were allowed. Therefore, in this study we...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/154405910608500914
更新日期:2006-09-01 00:00:00
abstract::The dental phenolic medicaments, eugenol and guaiacol, are partly similar in chemical structure to capsaicin, the pungent constituent of chili peppers, which selectively activates sensory neurons via a specific receptor. We have previously demonstrated that these phenolic compounds show capsaicin-like action. In the p...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/00220345970760040501
更新日期:1997-04-01 00:00:00
abstract::The aim of the present study was to describe the patterns of dental fluorosis in the primary and the permanent dentition of children born and reared in two different fluoridated areas, one in which powdered milk suspended in tap water was commonly used (Narssaq, Greenland: 1.1 ppm fluoride in the water) and one in whi...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/00220345880670050501
更新日期:1988-05-01 00:00:00
abstract::Erupting first permanent molars of 5 1/2 to 6 1/2 year-olds are eminently suited for the clinical testing of potential caries-inhibiting techniques. Due to the rapid onset of caries in these teeth, accurate monitoring of new materials/regimes can be instituted and meaningful data obtained within one year of trial comm...
journal_title:Journal of dental research
pub_type: 临床试验,杂志文章
doi:10.1177/002203457705600301011
更新日期:1977-10-01 00:00:00
abstract::Severe early childhood caries (S-ECC) is a multifactorial disease that can lead to suffering and reduced oral health-related quality of life in young children. The bacterial and fungal composition of dental plaque and how children's sex is associated with S-ECC are largely unknown. In this study, V4-16S rRNA and ITS1 ...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/0022034520908595
更新日期:2020-06-01 00:00:00
abstract::Lysis of cell wall preparations from strains representing serotypes a - g of Streptococcus mutans has provided a convenient and efficient means of obtaining the typing antigens in a soluble undegraded form, and has demonstrated that, in each case, the antigen is a cell wall component in the strict sense of a component...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/00220345830620100401
更新日期:1983-10-01 00:00:00
abstract::Samples of dental plaque obtained from the interproximal tooth surfaces of seven young men showed considerable variation in the prevalence and anatomic site distribution of the potentially cariogenic microorganism S mutans. Multiple application of 10% SnF2 topical solution and saline solution delivered to interproxima...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/00220345770560010301
更新日期:1977-01-01 00:00:00
abstract::Periodontal data typically consist of observations made at multiple sites within each patient. Observations within a patient tend to be positively correlated; hence, standard statistical techniques that assume independence are invalid. Regression techniques for correlated data have been proposed; communicating results...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/154405910308200705
更新日期:2003-07-01 00:00:00
abstract::While dental pulp appears to be able to form mineralized matrices that do not always resemble dentin, the precise characteristics of the hard tissue and the mechanism of its induction remain unknown. Therefore, we evaluated hard tissue induced by transplantation of pulp into subcutaneous tissue. Seven days after trans...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/154405910708600515
更新日期:2007-05-01 00:00:00
abstract::Fluoride content of drinking water is an important criterion in prescribing fluoride supplements. The majority of practicing dentists and physicians prescribe fluoride supplements, yet many apparently are unaware of the fluoride levels in their patients' drinking water. Characteristics of North Carolina (NC) dentists,...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/00220345860650011301
更新日期:1986-01-01 00:00:00
abstract::Hemifacial microsomia (HFM) is a congenital disorder marked by facial asymmetry. Whether facial asymmetry accounts for asymmetrical dental development is unknown. There are few data on dental development relative to mandibular development or severity of HFM, or on development over time. We hypothesized that when mandi...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/0022034510378425
更新日期:2010-12-01 00:00:00
abstract::Physico-chemical investigations of enamel from deciduous teeth of a small number of children with and without pre-natal fluoride supplementation (PNF) exhibited the following differences between the PNF and non-PNF enamel, with the former showing: (a) more homogeneous and less extensive patterns of acid-etching; (b) d...
journal_title:Journal of dental research
pub_type: 杂志文章
doi:10.1177/00220345850640031601
更新日期:1985-03-01 00:00:00