Local Factors in Dental Caries

Dobbs, Edward C.

doi:10.1177/00220345320120050801

Cited by 36 publications

(9 citation statements)

References 3 publications

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“…This difference ap pears in the range pH 4.8-5.2, where tur bidity and a precipitate was observed to oc cur and a plateau occurred in the titration curve. Dobbs [1932] reported turbidity at pH 4.9-4.66 when titrating plaque and a plateau around pH 5 was also reported in whole plaque by Straljors [1950]. It is prob able that the minimal extraction of protein matrix from the extracellular phase in plaque at pH 5.0, reported by Fox and Dawes [1970], may be related to the precip itation of soluble protein from plaque fluid during the extraction procedure since buff ering near pH 5 appears to be associated with the precipitation of a component in plaque fluid.…”

Section: Discussionmentioning

confidence: 99%

Buffering Capacity in Human Dental Plaque Fluid

Tatevossian¹

1977

Caries Res

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The buffering capacity was determined in the extracellular aqueous phase of 24-hour plaque samples obtained from dental students. The mean pH of five control samples of plaque fluid was 6.54 ± 0.26 SD. In the range pH 6–5, the mean buffering capacity was 3.2 × 10^––4 mol ΔaH⁺/mol H⁺ added while in the range pH 5–4 it was 1.8 × 10^––3 mol ΔaH⁺/mol H⁺ added, indicating a reduction in buffering at the lower pH range. Buffering between pH 5 and pH 4 was essentially reversible, while between pH 6 and pH 5, it was associated with the irreversible loss of a component which precipitated out. Buffering above pH was also associated with the irreversible loss of a component. It was concluded that at least three buffer components occur in plaque fluid and that rinsing with deionised water reduced the buffering capacity in plaque fluid.

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Section: Discussionmentioning

confidence: 99%

Buffering Capacity in Human Dental Plaque Fluid

Tatevossian¹

1977

Caries Res

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“…In a study of the local factors in dental caries, Dobbs [1932] showed differences in the rate of diffusion of salt solutions through 'dental plaque' removed from teeth by their immersion in 5% hydrochloric acid containing some potassium aluminium sul phate, which was added 'to prevent protein in the plaques from swelling'. He concluded that mouthwashes containing sodium bicar bonate or phosphate, or salivary bicarbon ate, would be of little importance in con trolling the acids produced in dental plaque because their diffusion in this system was relatively restricted and, with phosphates, prevented.…”

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confidence: 99%

Diffusion of Radio tracers in Human Dental Plaque

Tatevossian¹

1979

Caries Res

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A method for the determination of the diffusion coefficient, D, of solutes in the separated aqueous and residual phases of 24-hour human dental plaque is described. The separated plaque components were placed in tubing (inner diameter 0.49 mm), pulsed at one end with radiotracer, and horizontal diffusion was continued at 37 or 5 °C for 5–17 h. The results indicate that the diffusion of ¹⁴C-sucrose and ¹⁴C-inulin in plaque fluid was similar to that in water, while the diffusion of ¹⁴C-starch was unexpectedly greater than in water. The D values for the three carbohydrates studied were inversely related to their molecular weights. In plaque fluid, the diffusion of ionic species, bicarbonate, acetate, lactate, butyrate as sodium salts, was less than in water. In the plaque residue, the diffusion was restricted in relation to the packing density of the residue. While the diffusion into plaque of readily fermentable carbohydrate was not restricted, that of their bacterial metabolic products was impeded, consistent with the rapid fall and slow rise in plaque pH, known to occur after exposure to fermentable carbohydrate.

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“…Hence, if salivary glycoproteins do contribute to the matrix of plaque, probably only the protein "core" is retained. Dobbs (1932b) appears to be the first worker who attempted to estimate the matrix content of plaque. He homogenized plaque in 5% NaOH and found that the soluble material accounted for 28-52% of the weight of the plaque.…”

Section: Organic Constituentsmentioning

confidence: 99%

The Nature of Dental Plaque, Films, and Calcareous Deposits

Dawes

1968

Annals of the New York Academy of Sciences

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Local Factors in Dental Caries

Cited by 36 publications

References 3 publications

Buffering Capacity in Human Dental Plaque Fluid

Buffering Capacity in Human Dental Plaque Fluid

Diffusion of Radio tracers in Human Dental Plaque

The Nature of Dental Plaque, Films, and Calcareous Deposits

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