Abstract：
:Titanium-polymethacrylate composite was prepared as an x-ray-opaque filler for composite core materials. The base monomers of the composite were 2,2-bis [4-(3-methacryloyloxy-2-hydroxypropoxy) phenyl] propane (Bis-GMA) and triethyleneglycol dimethacrylate (TEGDMA). Pure titanium powder was used as a radiopaque element. Two functional methacrylates--isopropyl dimethacryloyl isostearoyl titanate (KR-7) and 4-methacryloyloxyethyl trimellitate anhydride (4-META)--were adopted as couplers of titanium powder. The radiopacity of composites was determined in terms of their equivalent thickness of aluminum per unit thickness of material. Compressive and transverse strengths of the composites were measured by use of coupled and untreated titanium fillers. The composites that contained 70% and 80% titanium by weight showed more radiopacity than enamel and less than amalgam. Radiopacity was controlled by the content of titanium filler in the composite. The decrease in compressive and transverse strengths of the composites was 0.7 to 15.9% and 43.7 to 52.9%, respectively, after one year's immersion in water. The decrease in transverse strength was remarkable; however, this deterioration was diminished by use of both KR-7 and 4-META as couplers for titanium. Thus, prepared titanium-polymethacrylate composite may be used as a radiopaque composite filler for self-curing composite core materials.
journal_name
J Dent Resjournal_title
Journal of dental researchauthors
Matsumura H,Sueyoshi M,Atsuta Mdoi
10.1177/00220345920710010201subject
Has Abstractpub_date
1992-01-01 00:00:00pages
2-6issue
1eissn
0022-0345issn
1544-0591journal_volume
71pub_type
杂志文章abstract：:Dendritic cells, such as Langerhans cells (LC), in different ectodermal compartments may have different functional capabilities. The present study was undertaken to compare oral Langerhans cells (LC) with those of the epidermis in terms of their ability to co-stimulate T-cells in vitro. A Mixed Epithelial Cell Lymphoc...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345990780030701
更新日期：1999-03-01 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：:Known antimalarial compunds from several chemical classes were tested for their ability to inhibit in vitro growth of microorganisms causing dental plaque and to prevent the development of plaque in a hamster model. Approximately a third of the compounds tested inhibited in vitro growth; however, none prevented develo...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345750540030901
更新日期：1975-05-01 00:00:00
abstract：:In the rat parotid acinar cell, methacholine caused an increase in [Ca2+]i as determined by quin-2 fluorescence. The increase in [Ca2+]i was initially independent of, and subsequently dependent on, the presence of extracellular Ca2+, indicating mobilization of intracellular Ca2+, as well as activation of Ca2+ entry. M...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345870660022701
更新日期：1987-02-01 00:00:00
abstract：:Previous studies show that both activin and Bmp4 act as crucial mesenchymal odontogenic signals during early tooth development. Remarkably, mice lacking activin-βA ( Inhba-/-) and mice with neural crest-specific inactivation of Bmp4 ( Bmp4ncko/ncko) both exhibit bud-stage developmental arrest of the mandibular molar t...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/0022034517713710
更新日期：2017-09-01 00:00:00
abstract：:Despite the recognized link between aging and cancer, most preclinical studies in experimental tumor models are conducted with 6- to 8-wk-old rodents. The goal of the present study was to examine the impact of age on tumor incidence, growth, and microenvironmental characteristics in mouse models of head and neck squam...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/0022034518775736
更新日期：2018-10-01 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：:Breastfeeding is important for health and development. Yet, the interaction between breastfeeding duration and usage of fluoridated water on caries experience has not been investigated. This study examined exposure to fluoridation as an effect modifier of the association between breastfeeding duration and caries. The ...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/0022034519843487
更新日期：2019-07-01 00:00:00
abstract：:microRNAs could be mechanosensitive and emerge as critical posttranscriptional regulators in the bone-remodeling process. During orthodontic tooth movement (OTM), the application of mechanical force induces alveolar bone remodeling, but whether microRNAs respond to orthodontic force and contribute to OTM is unknown. m...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/0022034516657043
更新日期：2016-11-01 00:00:00
abstract：:Our observations confirm the previously reported observation that multinucleated cells develop within a two-week period in cat bone-marrow cultures. Calcitonin induces cytoplasmic contraction in these multinucleated cells, which indicates that they resemble osteoclasts. After seven days of culture, cat bone-marrow cul...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345860650070201
更新日期：1986-07-01 00:00:00
abstract：:A major extracellular protein of cultured adult human gingival fibroblasts was shown to be fibronectin by indirect immunofluorescence, lactoperoxidase catalyzed iodination and metabolic radiolabeling. Fibronectin preparations from these cells possessed the biological properties of agglutination of sheep red blood cell...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345800590031301
更新日期：1980-03-01 00:00:00
abstract：:The present study was conducted to investigate the role of proteolysis by matrix metalloproteinase 20 (MMP20) in regulating the initial formation of the enamel mineral structure during the secretory stage of amelogenesis, utilizing Mmp20-null mice that lack this essential protease. Ultrathin sagittal sections of maxil...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/0022034518823537
更新日期：2019-04-01 00:00:00
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：:Adenoviral vectors effectively transfer genes to rat salivary glands. However, potent immune responses limit their use in vivo. Mice offer more opportunities than rats for the study of these immune processes. We first established conditions for infection of mouse salivary glands, with an adenoviral vector. The effects...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345000790020201
更新日期：2000-02-01 00:00:00
abstract：:A multiple logistic regression analysis was used to compute the odds ratios for 11 common occlusal features for asymptomatic controls (n = 147) vs. five temporomandibular disorder groups: Disc Displacement with Reduction (n = 81), Disc Displacement without Reduction (n = 48), Osteoarthrosis with Disc Displacement Hist...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345930720061301
更新日期：1993-06-01 00:00:00
abstract：:The DMF index provides one source of information on past and present dental caries experience; however, important limitations hinder its ability to characterize fully the impact of dental caries. The purpose of this paper is to describe a measure of selected restoration and tooth conditions that supplements informatio...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/002203459607502S06
更新日期：1996-02-01 00:00:00
abstract：:MMP-20 (enamelysin), the matrix metalloproteinase family member discovered in the enamel organ, has also been detected in odontoblasts during dentin formation. We studied the presence and localization of MMP-20 in mature human teeth in health and disease. In immunohistochemistry, MMP-20-positive staining was observed ...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/154405910208100905
更新日期：2002-09-01 00:00:00
abstract：:Ten dental casting alloys were tested for alloy-element release into cell-culture medium, and this release was related to alloy composition, alloy microstructure, and alloy cytotoxicity (previously determined). Cell-culture medium was analyzed for alloy elements by flame atomic absorption. Concentrations of elements i...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345910700060301
更新日期：1991-06-01 00:00:00
abstract：:A number of studies have been made investigating the properties of dental prosthodontic soft polymer materials. In such materials, which are used as short-term denture soft liners, the polymer component is complexed with one or more plasticizers. This lowers the glass transition temperature, Tg, of the polymer by allo...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345910700050201
更新日期：1991-05-01 00:00:00
abstract：:Mandibular prognathism (MP) is a recognizable phenotype associated with dentoskeletal class III malocclusion. MP is a complex genetic trait, although familial recurrence also suggests the contribution of single inherited variations. To date, the genetic causes of MP have been investigated using linkage analysis or ass...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/0022034515572190
更新日期：2015-04-01 00:00:00
abstract：:Local anesthetic agents may be classified according to their intrinsic anesthetic potency and duration of activity. Procaine and chloroprocaine are relatively weak, short-acting drugs. Lidocaine, mepivacaine, and prilocaine represent agents of intermediate potency and duration of action. Tetracaine, bupivacaine, and e...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345810600080903
更新日期：1981-08-01 00:00:00
abstract：:In mineralizing hamster molars, the influence of several inhibitors on p-NPP-ase has been demonstrated, and compared with their effect on PPi-ase, known to belong to the same enzyme. Whereas the latter activity is much more physiological, p-NPP is a better substrate to distinguish between the effects of bivalent catio...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345770560102701
更新日期：1977-10-01 00:00:00
abstract：:In this study, the effects of eugenol on human polymorphonuclear (PMN) cell migration and chemiluminescence were examined in vitro. Utilizing zymosan-activated serum or crude Bacteroides sonicate fractions as chemotractants, we found that eugenol inhibits PMN migration at 6.6 X 10(-2) to 6.6 X 10(-5) mol/L (P less tha...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345870660031401
更新日期：1987-03-01 00:00:00
abstract：:Focusing public insurance programs on interceptive orthodontics (IO) may increase access for low-income children. This report presents outcomes from a randomized clinical trial (RCT) comparing IO with comprehensive orthodontics (CO) in Medicaid patients. One hundred seventy pre-adolescents with Medicaid-eligible maloc...
journal_title：Journal of dental research
pub_type： 杂志文章,随机对照试验
doi：10.1177/0022034512448663
更新日期：2012-07-01 00:00:00
abstract：:This study describes the formation of a calcium polyacrylate-hydroxyapatite cement. Our hypothesis was that calcium phosphates would rapidly hydrolyze in the presence of polyacrylic acid (PAA) to form a cement. PAA, tetracalcium phosphate (TetCP), and dicalcium phosphate (DCP) were reacted together and formed calcium ...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345940730030501
更新日期：1994-03-01 00:00:00
abstract：:Current challenges in adhesive dentistry include over-hydrophilic bonding formulations, which facilitate water percolation through the hybrid layer and result in unreliable bonded interfaces. This study introduces nanogel-modified adhesives as a way to control the material's hydrophobic character without changing the ...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/0022034511426573
更新日期：2012-02-01 00:00:00
abstract：:The ability of human oral bacteria to inhibit Streptococcus mutans was studied under a variety of in vitro conditions using an agar overlay assay. Extensive inherent variability in microbial antagonism by certain organisms was demonstrated. Antagonistic activity was also significantly influenced by changes in the assa...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345800590110501
更新日期：1980-11-01 00:00:00
abstract：:Molecular studies indicate that epigenetic events are important in determining how the internal enamel epithelium folds during odontogenesis. Since this process of folding leads to the subsequent arrangement of cusps on molar teeth, we hypothesized that intercuspal distances of human molar teeth would display greater ...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/154405910308200505
更新日期：2003-05-01 00:00:00
abstract：:Dentin Matrix Protein 1 (DMP1) is highly expressed in alveolar bone and cementum, which are important components of the periodontium. Therefore, we hypothesized that Dmp1 is critical for the integrity of the periodontium, and that deletion may lead to increased susceptibility to disease. An early-onset periodontal def...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/154405910808700708
更新日期：2008-07-01 00:00:00
abstract：:Evidence that dental status affects diet is equivocal. The hypothesis of this study was that diet was affected by dental status. The objective was to assess the relationship between numbers of teeth and diet and nutritional status in US adult civilians without prostheses. We examined 6985 NHANES (1988-1994) participan...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/154405910708601206
更新日期：2007-12-01 00:00:00
