Abstract:
:Masseter and digastric muscle activities and jaw movement trajectories were recorded in freely moving rabbits during eating. The patterns in these trajectories and activities were similar to those described in previous studies on restrained animals. Although the duration of masticatory sequences, which started with food intake followed by grinding movements and ended by swallowing, varied, the total number of chewing cycles in a chain of masticatory sequences was consistent (1043 +/- 51, mean +/- SD; n = 5, for chow pellets) among the animals tested. When animals ate hard foods, extra bursts in the digastric electromyograms occurred frequently in the jaw-closing phase. The digastric activities were rather short (6.1 +/- 1.0 ms; n = 100) and the amplitude of these digastric short bursts (DSBs) was much larger (1.69 +/- 0.81 mV; n = 100) than in the opening phase (0.56 +/- 0.33 mV; n = 100), which actually depressed the jaw. When a soft food (bread) was tested, this activity was not observed. The proportion of occurrences of the DSB in a chewing cycle was high at the slow-closing phase, indicating that the DSBs were due to tooth contacts during food crushing. Of 1035 chewing cycles examined in the five animals, 124 were associated with a DSB and 415 cycles with a masseter inhibitory period (MIP). The proportion of the occurrences of the MIP was significantly larger than that of the DSBs. Of 124 DSBs, 85 (68.5 per cent) coincided with an MIP. Four were not associated with clear MIPs, although there was masseter activity at the time of the DSBs. The other 35 DSBs were out of phase with the masseter bursts, although still in a closing phase. The durations of the MIPs accompanied by a DSB were significantly longer than those not so associated. The DSB may be a reflex response mediated by periodontal mechanoreceptors when the upper and lower teeth come together while chewing hard food. The reflex arc for the DSB may be independent of that for the MIP, and the threshold for the DSB may be higher.
journal_name
Arch Oral Bioljournal_title
Archives of oral biologyauthors
Haraguchi N,Yamada Ydoi
10.1016/0003-9969(92)90099-tsubject
Has Abstractpub_date
1992-01-01 00:00:00pages
451-8issue
6eissn
0003-9969issn
1879-1506pii
0003-9969(92)90099-Tjournal_volume
37pub_type
杂志文章abstract:OBJECTIVE:To clarify whether over-eruption of the mandibular third molar can disturb chewing movement. METHODS:Eighteen patients with a unilateral mandibular over-erupted third molar confirmed by both study cast observation and T-scan occlusal detection were selected from a sample of patients with complaints of tempor...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2017.06.012
更新日期:2017-10-01 00:00:00
abstract:OBJECTIVE:Dental follicle cells (DFCs) are the genuine precursors of alveolar osteoblasts. Previous studies suggested that collagen I supports the osteogenic differentiation of DFCs. This study investigated the effect of collagen I on the osteogenic differentiation of human DFCs. MATERIALS AND METHODS:We modified the ...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2014.07.013
更新日期:2014-12-01 00:00:00
abstract::In this present study we have tested the impact of porfimer sodium (Photofrin, AXCAN PHARMA Inc., Quebec, Canada) photoactivated disinfection (PD) on cells of Streptococcus intermedius in suspension. In order to provide basic data to support future clinical studies of PD in dentistry the study used exposure to Quartz-...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2010.07.003
更新日期:2010-10-01 00:00:00
abstract::Substituting ferrets for rats and dogs as animal models for craniofacial research is favourable because of the similarity of many of the ferret's anatomical, metabolic and physiological features to those of man. Other advantages are cost-effectiveness and possibly less ethical controversy. However, information on the ...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/s0003-9969(02)00043-2
更新日期:2002-08-01 00:00:00
abstract:OBJECTIVE:The aim of the study was to assess whether or not Vitamin D deficiency was associated with the GCF and gingival tissue antimicrobial peptides (AMP), namely, human beta defensin-2 (hBD-2) and cathelicidin (LL-37) level in chronic periodontitis (CP) and gingivitis patients. DESIGN:A total of 80 volunteers were...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2020.104827
更新日期:2020-09-01 00:00:00
abstract::The aim was to establish defined-species consortium plaque biofilms to investigate enamel and root caries in an artificial mouth. Strains of the putative enamel and root caries pathogens, Streptococcus mutans, Strep. sobrinus, Actinomyces naeslundii and Lactobacillus rhamnosus, were screened in batch culture for poten...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/s0003-9969(99)00111-9
更新日期:2000-01-01 00:00:00
abstract::The presence of human STRO-1(+)/CD146(+) periodontal ligament (PDL) cells has been reported, but obtaining a large amount of these cells is difficult. The purpose of this study was to evaluate the percentages of STRO-1(+)/CD146(+) cells in PDL cells and determine the effects of FGF-2 on the proliferation and multiline...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2011.12.003
更新日期:2012-06-01 00:00:00
abstract:OBJECTIVE:Root grooves are considered a risk factor for periodontal disease. The purpose of this study was to measure the length of the root of maxillary lateral incisors (MLI), as well as the width and depth of the concavities of their proximal surfaces, and also to determine the prevalence of palato-gingival grooves....
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2006.02.008
更新日期:2006-08-01 00:00:00
abstract::Tissue transglutaminase (TGase 2) has been implicated in numerous cellular functions, i.e., apoptosis, differentiation, extracellular matrix protein cross-linking and organogenesis. Earlier report of the strong transient expression of TGase 2 localized at the anchoring sites of muscle bundles of human embryo and recen...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2005.01.007
更新日期:2005-09-01 00:00:00
abstract::This paper reports the development of a protocol allowing hybridization and detection of DNA fixed to nylon colony lifts from up to three species of bacteria simultaneously. Half ml samples of serial dilutions of pure cooked-meat broth (CMB) cultures of Capnocytophaga ochracea, Actinobacillus actinomycetemcomitans and...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/0003-9969(93)90105-u
更新日期:1993-11-01 00:00:00
abstract::Unitary discharges of periodontal mechanosensitive (PM) fibres were recorded from cat inferior alveolar nerve. More than half (66%) of the PM units were single-tooth ones sensitive to only one tooth. The majority (78%) responded sustainedly to stimulation of the mandibular canine tooth. The multitooth units responded ...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/0003-9969(94)90036-1
更新日期:1994-01-01 00:00:00
abstract:OBJECTIVES:Chronic injury in tongue causes the variety of reactions in the oral cavity, frequently leading to its functional and structural disintegrity including inflammation and sensory dysfunction, but its detailed profiles were not elucidated yet. One of the chronically injured tongue such as tongue piercing, as a ...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2018.12.008
更新日期:2019-03-01 00:00:00
abstract:OBJECTIVE:Hyposalivation is a common symptom of diabetes. Although microRNAs (miRNAs) play a role in the pathogenesis of diabetes, the specific effects of miRNAs on diabetic salivary glands are not clear. DESIGN:We used high-throughput technologies to screen differentially expressed (DE) miRNAs and mRNAs in submandibu...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2020.104947
更新日期:2020-12-01 00:00:00
abstract::Twenty-nine parotids ligated for between 1 and 365 days were examined by light and electron microscopy. Major changes in the acini were seen at 4 days and included vacuolation, disintegration, extravasation, apoptosis, phagy and a reduction in number and size of secretory granules. There was a further reduction in sec...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/s0003-9969(00)00076-5
更新日期:2000-11-01 00:00:00
abstract::Although most cases of cleft lip and palate are free of other developmental defects, children with isolated cleft lip/palate are at enhanced risk of delayed growth and reduced final size. Three variables were assessed in the permanent dentition away from the cleft site: congenital absence by tooth type (which ranged f...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/0003-9969(90)90210-2
更新日期:1990-01-01 00:00:00
abstract::Thirty rats were divided into 3 equal groups. Following 9 days of induced unimpeded eruption, a single partial pulp resection was performed on the repeatedly-shortened lower left incisor of one group. A total of 3 resections, each repeated after 48 h, was performed on the animals in a second group. The lower left inci...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/0003-9969(83)90127-9
更新日期:1983-01-01 00:00:00
abstract:OBJECTIVES:Dental evolution affects the geometry of the tooth, but the adaptive relevance of these changes is related to tooth sharpness, complexity, and relief (topography). On a set of laboratory mice, we assessed how wear related to age and food consistency affected molar geometry and topography. DESIGN:Three group...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2017.04.028
更新日期:2017-09-01 00:00:00
abstract::The functioning lower jaw is a prerequisite of the ongoing secondary chondrogenesis in the mammalian mandibular condyle. Does the articular function also initiate secondary chondrogenesis in the mandible? The angular process of the fetal mammalian mandible possesses a large secondary cartilage without any apparent art...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/0003-9969(93)90154-e
更新日期:1993-01-01 00:00:00
abstract:OBJECTIVE:The molecular variation of paired domain box gene 9 (PAX9) was previously investigated by our research group and a high degree of evolutionary conservation in coding and non-coding regions was observed except in exon 3. PAX9 is a transcription factor important in tooth development, and we wanted to verify its...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2010.10.020
更新日期:2011-04-01 00:00:00
abstract::The biological activity of carboxyl-terminal parathyroid hormone peptide[53-84] (PTH[53-84]) and aminoterminal peptide [1-34] (PTH[1-34]) during cultivation of the lower molar tooth germ from mouse embryos was examined. PTH[1-34] increased alkaline phosphatase activity in the tooth germ at an early developmental stage...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/s0003-9969(97)00107-6
更新日期:1998-04-01 00:00:00
abstract::Most commercial dentifrices contain sodium lauryl sulphate, which oxidizes upon storage. The effects of aged sodium lauryl sulphate and its oxidative breakdown products on the conversion of amorphous calcium phosphate to hydroxyapatite were studied in vitro by a pH drop method. Hydroxyapatite was identified from its X...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/0003-9969(92)90085-m
更新日期:1992-03-01 00:00:00
abstract::The apparent diffusion rate, D, of lactate was significantly retarded in dental plaque fluid and a simulated plaque fluid consisting of a chemically-defined solution of salts, amino acids and albumin in phosphate buffer at pH 6.5. Metabolic utilization of lactate in live plaque residue reduced D for lactate into such ...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/0003-9969(85)90106-2
更新日期:1985-01-01 00:00:00
abstract:OBJECTIVE:This study reports the expression of proinflammatory cytokines in temporomandibular joint (TMJ) of patients affected with temporomandibular osteoarthritis (OA). DESIGN:In twelve OA of the TMJ (OA-TMJ) affected patients and in six healthy volunteer subjects studied as control, the expression of IL1beta (inter...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2008.04.004
更新日期:2008-10-01 00:00:00
abstract:OBJECTIVE:Nonsyndromic cleft lip with or without cleft palate (NSCL/P) is a birth defect for which several genes susceptibility genes been proposed. Consequently, it has been suggested that many of these genes belong to common inter-related pathways during craniofacial development gene-gene interaction. We evaluated th...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2018.04.009
更新日期:2018-07-01 00:00:00
abstract:OBJECTIVE:The present study evaluated the nociceptive response induced by dentin hypersensitivity after dental erosion in rats that were exhibited to unpredictable chronic mild stress (UCMS)-induced depressive-like behavior. DESIGN:Adult male rats were subjected to UCMS (depression [D] group) or not (no depression [ND...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2017.04.005
更新日期:2017-08-01 00:00:00
abstract:OBJECTIVE:To evaluate in vitro the effectiveness of different calcium-silicate (CS) cements specifically designed for dentine permeability reduction. DESIGN:Fifty dentine discs were prepared from caries free human molars extracted for surgical reasons. The treatment consisted in applying two different experimental CS ...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2012.02.024
更新日期:2012-08-01 00:00:00
abstract::Recent reports characterizing the physiological properties of normal human labial acini are reviewed with particular emphasis on mechanisms related to fluid secretion. In contrast to the salivary glands of several experimental animals, human labial acinar cells do not appear to have a1-adrenergic receptors, substance ...
journal_title:Archives of oral biology
pub_type: 杂志文章,评审
doi:10.1016/s0003-9969(99)00044-8
更新日期:1999-05-01 00:00:00
abstract:OBJECTIVE:Previous evaluations of Psidium cattleianum leaf extract were not done in conditions similar to the oral environment. The aim of this study was to evaluate the effect of P. cattleianum leaf extract on enamel demineralisation, extracellular polysaccharide formation, and the microbial composition of dental biof...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/j.archoralbio.2012.02.009
更新日期:2012-08-01 00:00:00
abstract::In order to record pulp blood flow by photoplethysmography, the light transmission properties of extracted human teeth and human peripheral blood at wavelengths between 400 and 800 nm were first investigated. Transmission through peripheral blood and extracted teeth was lower at wavelengths shorter than 600 nm. Transm...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/0003-9969(94)90012-4
更新日期:1994-10-01 00:00:00
abstract::The secretions (HPS) contained an arylamidase-like enzyme discovered by chromatography on Sephadex G-100 Superfine columns using N-L-alanyl-2-naphthylamine (2NA) as substrate. The enzyme was fractionated in the void volume, suggesting that its molecular weight was 150,000 or higher. It hydrolysed, with decreasing rate...
journal_title:Archives of oral biology
pub_type: 杂志文章
doi:10.1016/0003-9969(85)90050-0
更新日期:1985-01-01 00:00:00