Showing papers in "Archives of Oral Biology in 1974"

TL;DR: With stimulation, the pH, ionic strength and the concentrations of protein, sodium, calcium, chloride and bicarbonate increased in proportion to flow rate, the potassium concentration remained almost constant whilst the magnesium and phosphate concentrations decreased, the former being independent of stimulated flow rate but the latter being inversely related to flow rates.

TL;DR: A biochemical scheme was developed for the separation of Streptococcus mutans into 5 biotypes, a-e, which correlated with the recognized serotypes a--e, and the biotype identification of the Strep.

TL;DR: The 14 C-activity in saliva showed a sharp fall during the first few hours, followed by a slow release, with activity still present after 24 hr, and the intra-individual variation, estimated by five mouth rinses at 1-week intervals, averaged ±4 per cent.

TL;DR: It is concluded that the caries-preventive effect of the ingested F was related both to elevated F levels in the surface enamel and to less retentive pits and fissures.

TL;DR: A new method for maintaining anaerobiosis during collection of a sample from root canals, as well as during transportation and identification was developed, and nearly all of a total of 104 anaerOBes from 377 isolated microorganisms were identified.

TL;DR: Marked increases in the amylase concentration of saliva occurred in response to sympathetic stimulation in the four subjects studied, accompanied by increases in heart rate and blood pressure and small, variable changes in salivary flow rates.

TL;DR: The clinical effect of chlorhexidine as a plaque inhibitor seems to be dependent on the retention of the agent in the oral cavity.

TL;DR: Data are presented which support the view that fibroblasts in the periodontal ligament of the incisor, apart from synthesizing collagen, are also engaged in degrading collagen fibres, necessary to maintain the structural integrity of the ligament in a dynamic situation.

TL;DR: The oral retention of chlorhexidine-digluconate from rinsing solutions of 0.05, 0.1,0.2 and 0.4 per cent was measured, essentially proportional to the concentration, with a slight deviation towards less retention at the 0.

TL;DR: There was a sharp drop in the major chromatographical component of enamel protein between stages of cheese-like enamel and chalk-likeEnamel samples at four different stages of development were separated from embryonic bovine teeth by scraping, and demineralized by dialysis against 0.5 M acetic acid.

TL;DR: Feasibility of analyses for OH and other components in regions as small as 20 μm across has been demonstrated with a view toward analysis of spatial variation of tooth composition, and apatite-like spectra exhibiting both broadening and mode-frequency shifts are shown.

TL;DR: There was a significantly higher yield of bacterial mass under conditions of glucose-limitation than under conditionsof nitrogen-limite, and all streptococci formed lactate as the main fermentation product when grown in a medium containing a surplus of glucose with the nitrogen source limiting growth.

TL;DR: Haemagglutinating activity was found in 29 out of 59 strains of B. melaninogenicus isolated from human gingival crevices and fimbria-like structures were observed in all strains manifesting haemag GLUTinating activity.

TL;DR: Attention is drawn to the diurnal rhythm of enamel formation indicated by prism cross-striations and to the approximately 8-day periodicity of the striae of Retzius, which could be an imperfect synchronization of two or more circadian rhythms, ameloblast activity and general body activity.

TL;DR: The orthodontically stimulated rat periodontal ligament (PDL) proved to be a useful experimental model for studying cell proliferation and resulted in a progressive increase in tritiated thymidine ([ 3 H]-T)labelling indices of “PDL fibroblasts”.

TL;DR: Microradiography of thin sections of dentine taken from a large sample of human teeth revealed a number of hitherto unknown facts about dentine sclerosis, indicating that the physiological sclerotic process is in some way initiated by the stresses imposed by the oral environment.

TL;DR: The complexity of this family of unusual macromolecules is demonstrated and the isolation and characterization of two of its minor members are described.

TL;DR: Examination of fibroblasts within the periodontal ligament of functioning lower first molars with the electron microscope revealed the frequent occurrence of membrane-bound intracytoplasmic profiles containing banded collagen, suggesting the cellular basis for connective tissue turnover is the same as for connectives remodelling, namely the fibroblast.

TL;DR: The formative stage demonstrated a response to the fluoride in the morphology of the cells and their product, and during maturation, groups of the ameloblasts often were altered with huge intracellular vacuoles, while adjacent enamel appeared to mature normally.

TL;DR: Siblings of children with the lesion had a prevalence significantly greater than the total study population, suggesting that factors operating at the family level enhance the occurrence of the hypoplastic lesion in children.

TL;DR: Circadian variations have been demonstrated in unstimulated submandibular saliva from 15 subjects for flow-rate, pH and concentrations of sodium, potassium, calcium, chloride, inorganic and total phosphate, protein, nitrogen and carbohydrate.

TL;DR: Differences exist between the innervation patterns of primary and permanent teeth, and predictability of unmyelinated innervation quantities from more easily determined myelination quantities is suggested.

TL;DR: The demonstration of fibres on the outer surface of these bacteria provides structural evidence for a potential mechanism of adhesion in plaque organisms as both organisms induce experimental periodontal disease in hamsters and gnotobiotic rats.

TL;DR: The data show that the turnover of collagen in normal gingiva is inordinately high when compared to the other connective tissues of the same animals, and provide the basis for a new hypothesis which states that the collagen loss observed in inflammatory gingival disease may result from interference with synthesis and turnover ofCollagen.

TL;DR: The concept that salivary myoepithelial cells in the cat have a motor parasympathetic innervation is supported, as the extent of the acinar atrophy paralleled the diminution in secretion.

TL;DR: Plaque samples from clinically sound bucco-lingual and occlusal and approximal surfaces were examined for the presence of Streptococcus mutans and the percentage of Strep, mutans to total streptococci was also higher in the control group than the caries-free group.

TL;DR: The enamel was completed first to the same morphological extent as that of mammalian enamel on which no cementum is laid down, however, the enamel did not become fully mature as assessed by the concentration of calcium measured by elemental X-ray analysis.

TL;DR: Chewing of hard food induced, in contrast to that of the soft, more vigorous jaw movements characterized by increased rate and shorter duration of chewing strokes as well as higher frequency and amplitude of spikes in each stroke.

TL;DR: Electrical stimulation of the autonomic nerves destined for the submandibular gland of the rat found that in both males and females the granular convoluted tubule cells respond to α-sympathetic stimulation only.

TL;DR: Variation of the position of the lower jaw showed that the twitch tension, produced by discrete single stimuli, was greatest when the mouth was opened by about 8 mm from occlusion, which differs from that for voluntary biting power in the human subject.