Abstract：
:Evidence was sought for urea-induced pH gradients in dental plaque microcosm biofilms cultured from the mixed salivary bacteria in a multi plaque 'artificial mouth'. Application of 500 mmol/l urea for short periods (6 min) to 5-8 mm maximum-thickness plaques induced intraplaque pH gradients of up to 0.7 pH units with the surface alkaline relative to the inner plaque. These pH gradients persisted for more than 5 h in the absence of a flow of fluid. With 30-min urea applications and a flow of a basal medium containing mucin (BMM, pH 7.0), the pH of the inner (deeper) plaque regions also increased. Although the pH gradient initially formed was alkaline at the plaque surface, the BMM flow lowered the surface pH to neutrality whilst the inner layers were still alkaline, thereby reversing the pH gradient. In thick microcosm dental plaques, urea-induced pH gradients can therefore form and last many hours. They probably result from the significant time taken for urea to penetrate to the inner layers of plaque, its rapid metabolism by the outer plaque layers, and a rate-limiting clearance of ammonia. Even a slow BMM flow over the plaque greatly increased the rate of return to the resting pH, causing the gradients to change polarity.
journal_name
Arch Oral Bioljournal_title
Archives of oral biologyauthors
Sissons CH,Wong L,Hancock EM,Cutress TWdoi
10.1016/0003-9969(94)90147-3subject
Has Abstractpub_date
1994-06-01 00:00:00pages
507-11issue
6eissn
0003-9969issn
1879-1506pii
0003-9969(94)90147-3journal_volume
39pub_type
杂志文章abstract：:Hinokitiol, a natural iron-chelating agent, is known to have diverse biological and pharmacological activities in various cell types. However, the effect of hinokitiol on dental pulp cells has not yet been reported. In this study, hinokitiol increases hypoxia-inducible factor-1α (HIF-1α) protein levels and vascular en...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/j.archoralbio.2013.10.009
更新日期：2014-02-01 00:00:00
abstract：:The purpose of the study was to test the hypothesis that both insoluble pure type I collagen from bovine Achilles tendon and dentine collagen in root dentine powder from human teeth required acid pretreatment for subsequent degradation by trypsin, a non-specific protease. Pure type I collagen or dentine powder was tre...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/0003-9969(94)90022-1
更新日期：1994-10-01 00:00:00
abstract：:In a previous study, it was shown that tooth germs of neonatal homozygous parathyroid hormone-related protein (PTHrP)-knockout mice are penetrated or compressed by the surrounding alveolar bone, suggesting an important role for PTHrP in the formation and activation of osteoclasts around growing tooth germs. In order t...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/s0003-9969(02)00026-2
更新日期：2002-09-01 00:00:00
abstract：:Significant differences were found in the electromyographic (EMG) activation between the masseter and temporalis muscles for the leaf gauge (LG), manually manipulated (CR) and neuromuscular (NM) bite positions during maximal static clench. The LG position consistently demonstrated the lowest EMG activity, while the NM...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/0003-9969(93)90037-m
更新日期：1993-03-01 00:00:00
abstract：OBJECTIVE:We previously proposed the hamster cheek pouch model of oral cancer for BNCT studies. We herein present the biodistribution of a non-toxic boron compound, GB-10 (Na(2)(10)B10H10), in this model to assess its potential for BNCT or BNCT enhanced Fast Neutron Therapy. MATERIALS AND METHODS:We evaluated the upta...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/j.archoralbio.2003.10.003
更新日期：2004-04-01 00:00:00
abstract：OBJECTIVES:The aim of this study was to determine whether measurements of volatile sulfur compounds (VSCs) are useful to predict colonization of periodontopathic bacteria. For this purpose, we assessed the relationships among distributions of 4 species of periodontopathic bacteria in tongue coating and dental plaque, o...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/j.archoralbio.2012.09.019
更新日期：2013-03-01 00:00:00
abstract：:With scanning electron microscopy, globules were seen in inter-cellular spaces between ameloblasts with ruffled borders and papillary cells at early maturation stage. Numerous globules were located on longitudinal folds between parallel ridges on the sides of ameloblasts, but only a few in the papillary layer. In prev...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/0003-9969(84)90121-3
更新日期：1984-01-01 00:00:00
abstract：BACKGROUND:Interleukin-6 (IL-6) is a potent stimulator of osteoclastic bone resorption. Osteoblast secretion of IL-6 plays an important role in the regulation of bone metabolism. Angiotensin II (Ang II) has been shown to regulate the expression of potent inflammatory factors, including MCP-1 and IL-6, by stimulating en...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/j.archoralbio.2010.09.016
更新日期：2011-03-01 00:00:00
abstract：:The forces that develop in the human temporomandibular joint during function have never been directly measured, yet many patients exhibit excessive localized wear and tear of the joint, suggesting that at times these forces exceed tissue tolerance. The purpose here was to gain insight into vibration transmission betwe...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/s0003-9969(01)00068-1
更新日期：2001-11-01 00:00:00
abstract：:The effect of muscle temperature on the speed of contraction and on the strength of contraction of the cat jaw muscles was studied. Muscles contracted faster when their temperatures were increased. The tetanic and twitch tension decreased significantly as the animal was heated from 30 to 40 degrees C. ...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/0003-9969(84)90030-x
更新日期：1984-01-01 00:00:00
abstract：:Both the mandibular condyle and the glenoid fossa remodel in response to changes in the dentition during life, although the precise relationship between teeth and joint is not clear. This study was undertaken to ascertain changes, if any, occurring in the glenoid fossae in skeletons with much tooth wear. In a collecti...
journal_title：Archives of oral biology
pub_type： 历史文章,杂志文章
doi：10.1016/0003-9969(92)90154-z
更新日期：1992-01-01 00:00:00
abstract：:Human salivary alpha-amylase participates in the initial digestion of starch and may be involved in the colonization of viridans streptococci in the mouth. To elucidate the role of histidine residues located near the starch-binding site on the streptococcal-binding activity, the wild type and three histidine mutants, ...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/s0003-9969(98)00112-5
更新日期：1999-02-01 00:00:00
abstract：:Smears of buccal mucosa, dorsal surface of the tongue and floor of mouth were taken from 10 patients with histologically confirmed oral lichen planus and 12 healthy age- and sex-matched controls. In buccal smears, no significant differences in cytoplasmic and nuclear areas were observed between lesional, adjacent non-...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/0003-9969(95)00106-9
更新日期：1996-01-01 00:00:00
abstract：:A microtitre assay has been developed using hydroxyapatite-coated wells and Streptococcus sanguis NCTC 10904 at 10(7) cells per ml. A number of models representing toothpaste and mouthwash usage were adopted to detect the anti-adherent efficacy of a polyvinylmethylether maleic acid copolymer (PVM/MA), polyoxypropylene...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/s0003-9969(00)00105-9
更新日期：2001-02-01 00:00:00
abstract：:Previous studies of the sympathetic nerve supply of the rat mandibular incisor pulp have shown conflicting results. Here, the neurovascular control of the rat lower incisor pulp was investigated by stimulating the tooth crown and the cervical sympathetic trunk electrically and monitoring blood-flow changes in the pulp...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/0003-9969(92)90033-5
更新日期：1992-12-01 00:00:00
abstract：OBJECTIVE:To determine if dentine at the enamel-dentine junction (EDJ) in man is more sensitive to hydrostatic pressure stimuli then deeper dentine. DESIGN:Cavities (1mm diam.) were cut at the tips of the buccal and lingual cusps of 8 premolars in 3 subjects (ages: 22-25 years). Both cavities were initially deepened t...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/j.archoralbio.2016.02.015
更新日期：2016-06-01 00:00:00
abstract：:Subdividing the cheek, palate and ventral tongue into seven anatomically identifiable regions enabled us to assess relationships that were previously obscured by the great heterogeneity of rat oral epithelium. Capillaries were visualized by an alkaline phosphatase azo dye method in oral mucosa of four 3-month old male...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/0003-9969(82)90058-9
更新日期：1982-01-01 00:00:00
abstract：OBJECTIVE:To assess a panel of risk factors associated to oral candidosis (OC) onset and its chronic maintenance by means of fuzzy logic (FL) approach and statistical traditional methodology (STM); to investigate their casual relationship within a multifactorial framework. DESIGN:Case-control study. SETTING:One hospi...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/j.archoralbio.2007.11.009
更新日期：2008-04-01 00:00:00
abstract：AIM:This study was planned to investigate whether smoker patients with inflammatory periodontal disease exhibit different salivary concentrations of C-telopeptide pyridinoline cross-links of type I collagen (ICTP) and osteocalcin (OC) compared to the non-smoker and/or ex-smoker counterparts. METHODS:Whole saliva sampl...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/j.archoralbio.2009.09.009
更新日期：2009-12-01 00:00:00
abstract：OBJECTIVES:The antibacterial activity of Coffea canephora extract was evaluated in vitro against Streptococcus mutans and Streptococcus sobrinus. The viability of planktonic cells was analysed by susceptibility tests (MIC and MBC) and time-kill assays. The effect of the extract on dental demineralisation was also inves...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/j.archoralbio.2010.12.001
更新日期：2011-06-01 00:00:00
abstract：OBJECTIVES:A resin infiltrant was employed for the treatment of active white spot lesions due to its ability to penetrate into the enamel pores and prevent the progression of the lesion. However, limited information is available about its mechanical effect on different artificial enamel lesions as well as on its resist...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/j.archoralbio.2018.07.011
更新日期：2018-11-01 00:00:00
abstract：OBJECTIVE:The complex biological, physicochemical process of human dental enamel formation begins in utero and for most teeth takes several years to complete. Lost enamel tissue cannot regenerate, therefore a better understanding of the spatial and temporal progression of mineralization of this tissue is needed in orde...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/j.archoralbio.2013.08.012
更新日期：2013-11-01 00:00:00
abstract：:The response of maxillary tissues to mucoperiosteal manipulation at different ages was studied microscopically early after operation and at maturity. Thirty-two Beagles were divided into three experimental groups, a sham-operated group and a control group. At the age of 6, 16 or 25 weeks in the experimental groups an ...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/0003-9969(91)90033-q
更新日期：1991-01-01 00:00:00
abstract：OBJECTIVE:to evaluate the association between XPD and XRCC3 polymorphisms and oral squamous cell carcinoma (OSCC). DESIGN:the sample consisted of 54 cases of OSCC and 40 cases of inflammatory fibrous hyperplasia (IFH). Genotypes were determined by the polymerase chain reaction-restriction fragment length polymorphism ...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/j.archoralbio.2015.12.004
更新日期：2016-04-01 00:00:00
abstract：:Cell migration and replication associated with odontoblast replacement occurring soon after pulp exposure in primate teeth were studied. Class 5 cavity preparations resulting in pulp exposures were restored with a calcium hydroxide-containing capping agent and amalgam. Eighty-four and 96 h after this the animals were ...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/0003-9969(90)90093-p
更新日期：1990-01-01 00:00:00
abstract：:Previous studies using potassium ion-selective microelectrodes have demonstrated that potassium concentrations in dental plaque fluid obtained by centrifugation are identical to whole plaque values determined immediately after collection. Such procedures were now used to examine the variations in potassium concentrati...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/0003-9969(88)90030-1
更新日期：1988-01-01 00:00:00
abstract：:These studies were made as a first step in elucidating unknown functions of enamel proteins in odontogenesis. The cytoplasm of ameloblasts and the proteins in dentine matrix before mineralization were stained with this monoclonal antibody. SDS-PAGE and Coomassie blue staining of proteins extracted from enamel showed s...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/0003-9969(91)90113-9
更新日期：1991-01-01 00:00:00
abstract：OBJECTIVE:To investigate the effects of sitagliptin, a dipeptidyl peptidase 4 inhibitor used to treat type II diabetes, on bone tissue and on implant osseointegration in diabetic rats. DESIGN:Thirty-two male rats were divided into four groups: 1) Diabetic animals (GD); 2) Diabetic animals that received sitagliptin (GD...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/j.archoralbio.2019.04.018
更新日期：2019-06-01 00:00:00
abstract：:A mandibular kinesiograph was used to monitor the movement of the lower incisors of young dentate adults reading a standard text. An interface to a microcomputer which recorded and analysed these movements. As the tracings accumulated on the computer monitor, a characteristic pattern was produced. The dimensions of th...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/0003-9969(87)90068-9
更新日期：1987-01-01 00:00:00
abstract：OBJECTIVE:To compare the effectiveness and acceptability of a newly developed pediatric sialometer as an alternative to the conventional spitting method. METHODS:A clinical study was carried out with healthy children (G1; n = 30) and oncological children (G2; n = 30). A newly developed pediatric sialometer was compare...
journal_title：Archives of oral biology
pub_type： 杂志文章
doi：10.1016/j.archoralbio.2020.104847
更新日期：2020-10-01 00:00:00
