Abstract：
:Enamel abraders used in two-body wear tests suffer the disadvantage that standardization is difficult or impossible to obtain. The aim of this study was to test whether steatite (a ceramic material with a Vickers Hardness similar to that of enamel) could be used as a satisfactory human enamel analogue. The friction and wear characteristics of 'spherical' abraders made from these two materials against composite and amalgam specimens were therefore compared. A two-body wear test for restorative materials was devised which could be carried out in a Universal Testing Machine and which allowed for continuous monitoring of the frictional forces during wear. The results showed that steatite and enamel abraders produced similar coefficients of friction (correlation coefficient, r = 0.98). A linear relationship was found between depth (and volume) of wear and number of cycles (r = 0.98 to 0.99). Wear rate was not affected by the increase in abrader facet area. The wear rate against the steatite abrader was slightly greater than that against enamel, but the two abraders were reasonably correlated (r = 0.94). Friction and wear were correlated for the steatite abrader (P < 0.05, r = 0.88) but not the enamel abrader. The hybrid composites had a high wear rate and wore both the abraders more than did the microfilled composites or amalgam. These findings suggest that steatite is a suitable substitute for enamel in this type of test.
journal_name
J Dent Resjournal_title
Journal of dental researchauthors
Wassell RW,McCabe JF,Walls AWdoi
10.1177/00220345940730091001subject
Has Abstractpub_date
1994-09-01 00:00:00pages
1546-53issue
9eissn
0022-0345issn
1544-0591journal_volume
73pub_type
杂志文章abstract：:Previous studies suggest that salivary and pulp-derived host enzymes, matrix metalloproteinases (MMPs), may be involved in dentin caries pathogenesis. To study the inhibition of acid-activated human salivary MMPs by non-antimicrobial chemically modified tetracyclines (CMTs), we used a functional activity assay with 12...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345010800061301
更新日期：2001-06-01 00:00:00
abstract：:Estrogen deficiency results in disruption of maxillary alveolar bone microarchitecture. Most of the actions of estrogen in long bones occur via estrogen receptor α (ERα). However, the function of ERα in the maxillary bone has not been defined. We aimed to investigate the role and underlying mechanisms of ERα in the ph...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/0022034516633154
更新日期：2016-06-01 00:00:00
abstract：:A conceptual means of obtaining improved bonding between filler particles and the polymeric binders of composites is presented. It involves preparing glass particles that separate into two interconnected vitreous phases when heated to an appropriate temperature, and then etching these to produce a porous surface layer...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345760550050701
更新日期：1976-09-01 00:00:00
abstract：:Fibroblast growth factor receptor 2 (FGFR2) in craniofacial bones mediates osteoprogenitor proliferation, differentiation, and apoptosis. The distortion of proper craniofacial bone growth may cause class II and class III skeletal malocclusion and result in compromised function and aesthetics. Here, we investigated the...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/0022034519872951
更新日期：2019-11-01 00:00:00
abstract：:There are no prospective studies investigating the effects of sugar-related feeding practices on changes in dental caries from early childhood to young adulthood. The aim of this study was to assess whether sugar-related feeding practices affect dental caries between the ages of 6 and 18 y. This birth cohort study was...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/0022034515625907
更新日期：2016-04-01 00:00:00
abstract：:The antimicrobial and cariostatic activities of the dihydrochloride and dihydrofluoride salts of alexidine (1,6-bis-[2-ethylhexylbiguanido]hexane) were compared to those of chlorhexidine acetate and sodium fluoride in rats implanted orally with Streptococcus mutans 6715 and fed a cariogenic diet. Experimental caries w...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345790580041901
更新日期：1979-04-01 00:00:00
abstract：:Van der Woude syndrome (VWS) is an autosomal-dominant oral facial disorder. To find a gene mutation in a Japanese family using fingernail DNA samples, we performed this study. We hypothesized that a gene mutation in IRF6 might be involved in VWS, and that fingernail DNA samples may be valuable for detecting such mutat...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/154405910608501215
更新日期：2006-12-01 00:00:00
abstract：:Fibroblast growth factor (FGF) signaling has been implicated in the regulation of osteogenesis in both intramembranous and endochondral ossifications. In the developing palate, the anterior bony palate forms by direct differentiation of cranial neural crest (CNC)-derived mesenchymal cells, but the signals that regulat...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/0022034517750141
更新日期：2018-05-01 00:00:00
abstract：:Recent studies have shown that the extent of hydrolysis by plaque of the trypsin substrate, N-benzoyl-DL-arginine-2-naphthylamide (BANA), correlates with the numbers and proportions of spirochetes in subgingival plaque samples, and appears to be an indicator of clinical disease. In this study, BANA hydrolysis by subgi...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345880670121201
更新日期：1988-12-01 00:00:00
abstract：:The expression of antimicrobial peptides at epithelial surfaces such as skin, lung, and intestine is thought to provide protection against infection. Cathelicidin antimicrobial peptides are essential for the protection of skin against invasive bacterial infection. To determine if cathelicidins are also present in the ...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/154405910208101210
更新日期：2002-12-01 00:00:00
abstract：:Smoking is a major risk of periodontal diseases. At the site of first contact, the gingiva is exposed to aromatic amines and polycyclic hydrocarbons. These are metabolized by the N-acetyltransferases (NAT), leading to local detoxification and/or activation reactions contributing to the risk of periodontal destruction ...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/154405910208100512
更新日期：2002-05-01 00:00:00
abstract：:The effects of demineralized dentin and bone matrix on dental ectomesenchymal cells were evaluated after observation periods of two or three weeks. Autogenous dentin and bone matrix, obtained from the crowns of primary molars or maxillary cortical bone, respectively, were demineralized with 3% acetic acid and implante...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345900690011301
更新日期：1990-01-01 00:00:00
abstract：:Previous studies have shown that extracts of various filling materials, e.g., resin composites, may influence the growth of cariogenic micro-organisms. The purpose of this study was to examine the effects of important resin composite (co)monomers (Bis-GMA, UDMA, TEGDMA, EGDMA) and extracts of two commercial dental com...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345980770010601
更新日期：1998-01-01 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：:A dental appointment commonly prompts fear of a painful experience, yet we have never fully understood how our brains react to the expectation of imminent tooth pain once in a dental chair. In our study, 21 patients with hypersensitive teeth were tested using nonpainful and painful stimuli in a clinical setting. Subje...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/0022034515581642
更新日期：2015-07-01 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：:The expired air of a group of 48 persons, 40 with and eight without dental amalgam restorations, was analyzed for its mercury content before and after chewing. Expired air samples were collected in polyethylene bags, and a known quantity of each was pumped into the mercury detector for measurement. The results showed ...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345810600090601
更新日期：1981-09-01 00:00:00
abstract：:Relative glycogen synthetic abilities of resting cells of fresh clinical isolates of Actinomyces viscosus and Actinomyces naeslundii originating from dental plaque samples over root surface caries lesions and non-carious sites were studied under anaerobic conditions at a constant pH of 7.0, with U-(14C)-glucose used a...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345860650060701
更新日期：1986-06-01 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：:Spontaneously occurring bacteriophage-resistant mutants of Actinomyces viscosus were isolated. The mutants exhibited altered coaggregation patterns with streptococci. From analysis of the data, it appears that a cell surface structure on A. viscosus may function both as a phage receptor and as a binding site for co-ag...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345830620111801
更新日期：1983-11-01 00:00:00
abstract：:During orofacial tissue development, the anterior and posterior regions of the Meckel's cartilage undergo mineralization, while the middle region undergoes degeneration. Despite the interesting and particular phenomena, the mechanisms that regulate the different fates of Meckel's cartilage, including the effects of bi...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/0022034520960118
更新日期：2021-02-01 00:00:00
abstract：:In a standard periodontal treatment strategy with consecutive root planings (per quadrant at a one- to two-week interval), re-infection of a disinfected area might occur before completion of the treatment. This study examines, both clinically and microbiologically, whether a full-mouth disinfection within 24 hours sig...
journal_title：Journal of dental research
pub_type： 临床试验,杂志文章,随机对照试验
doi：10.1177/00220345950740080501
更新日期：1995-08-01 00:00:00
abstract：:Selected anaerobic, capnophilic and facultative bacteria isolated from patients with various forms of periodontal health and disease were tested for their susceptibility to antibiotics and antimicrobial agents. Specific bactericidal and minimum inhibitory concentrations were compared to disc zone diameters, thereby ge...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345790580071401
更新日期：1979-07-01 00:00:00
abstract：:Samples of plaque and surface enamel were collected from 80 boys aged 14 years living in five communities in Ohio (USA). Mean (+/- SE) strontium concentrations in plaque were 1.43 +/- 0.18 micrograms/g (wet) and 12.34 +/- 1.63 micrograms/g (dry). For surface enamel, the mean concentration was 421 +/- 31 micrograms Sr/...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/00220345850640121201
更新日期：1985-12-01 00:00:00
abstract：:Although it has been shown that patients are more satisfied with prostheses supported by implants than with conventional dentures, there have been few direct comparisons of the various designs of implant-supported prostheses. This within-subject crossover clinical trial was designed to compare two forms of removable p...
journal_title：Journal of dental research
pub_type： 临床试验,杂志文章
doi：10.1177/00220345970760100901
更新日期：1997-10-01 00:00:00
abstract：:The aim of this systematic review and network meta-analysis was to summarize the direct and indirect clinical evidence on the effectiveness of professionally applied and self-applied topical fluorides in preventing dental root caries. Controlled clinical trials with any follow-up duration were included. MEDLINE, PubMe...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/0022034520906384
更新日期：2020-05-01 00:00:00
abstract：:The whisker pad area (WP) is innervated by the second branch of the trigeminal nerve and experiences allodynia and hyperalgesia following transection of the mental nerve (MN; the third branch of the trigeminal nerve). However, the mechanisms of this extra-territorial pain remain unclear. The ionotropic P2X(7) ATP rece...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/0022034512474668
更新日期：2013-03-01 00:00:00
abstract：:The size of a bolus determines how it will be manipulated in the mouth and swallowed. We hypothesized that mucosal sensitivity would be important for masticatory function. The accuracy of solid object size perception, spatial acuity, and food particle size reduction during mastication were measured in 22 healthy adult...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/154405910408300507
更新日期：2004-05-01 00:00:00
abstract：:Recent reports have suggested functional interactions between the masticatory and head motor systems. However, the neurophysiological mechanisms behind these phenomena have not been thoroughly investigated. In this study, the motor unit activity was recorded bilaterally from the dorsal neck splenius muscles (SPL) whil...
journal_title：Journal of dental research
pub_type： 杂志文章
doi：10.1177/154405910308200515
更新日期：2003-05-01 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
