Lactic Acid Formation By Lactobacilli Exposed to Fluoridized Enamel

Zwemer, Jack D.

doi:10.1177/00220345570360020401

Cited by 21 publications

(5 citation statements)

References 14 publications

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“…The crowns of 2-to 3-yearold bovine incisors were cut into blocks of about 10x10 mm with a thickness of 3 mm, so that the test site represented the middle of the labial surface. For the attachement of incubation tubes the technique demonstrated by Zwemer [1957) and modified by Turtola[\9TI\ was used. A detailed description is giv en in a former paper [Luoma et al, 1983).…”

Section: Methodsmentioning

confidence: 99%

Alterations by Mg and F of the Fermentative Dissolution of F-Varnished Enamel by a Streptococcal Layer Measured by a Microhardness Tester and a Proton Probe Microanalysis

Luoma¹,

Räisänen²

1984

Caries Res

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The effects of F+ Mg additives on the F varnish-treated bovine enamel underneath a fermenting Streptococcus mutans layer was investigated. The enamel slabs with the streptococcal layer were incubated at 37 °C for 18 h. The final pH after the fermentation on the highly fluoridated enamel surface was 4.4, whereas the added fluoride concentration of 25 ppm elevated the final pH by 0.5 unit. Added magnesium had no effect on pH values. Magnesium was released from the cells during the sucrose fermentation and the fluoride addition prevented this release by one half, whereas the magnesium addition had no effect. The fermentative dissolution of Ca from the enamel was decreased by the added fluoride while the phosphorus dissolution was not significantly altered. The added fluoride further increased the enamel fluoride content but could only slightly prevent the enamel softening caused by the preceding etching and by fermentation of the streptococcal layer. The addition of magnesium had a slight tendency to reduce all the enamel-protective effects of fluoride.

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Section: Methodsmentioning

confidence: 99%

Alterations by Mg and F of the Fermentative Dissolution of F-Varnished Enamel by a Streptococcal Layer Measured by a Microhardness Tester and a Proton Probe Microanalysis

Luoma¹,

Räisänen²

1984

Caries Res

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“…Tlie crowns were kept moist, according to need, before experimentation was begun. Small tubes were attached to the labial surface according to the technique demonstrated by ZwEMER (1957), but owing to centrifugal forces used, the wax fastening was not sufficiently tight. For thi5 reason, one, two or four circular grooves were drilled on the test surfaces with a D&Z 11® {Drendel & Zweiling, Berlin) diamond drill.…”

Section: Methodsmentioning

confidence: 99%

Enamel microhardness and fluoride uptake underneath fermenting and non‐fermenting artificial plaque

Turtola

1977

European J Oral Sciences

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Washed cells of Streptococcus sanguis were used tO' form artificial plaque on the surface of bovine enamel and incubated underneath buffer solutions, initial pH 6, for 36 h at 3 7°C. The decrease in the microhardness of the enamel surface under fermenting "plaque" could be prevented with fluoride. Enamel under a fermenting "plaque" tool up significantly more (/'<0.01) fluoride than enamel under a non-fermenting "plaque" (initial E" in buffer: 10 parts/10'). The artificial plaque did not accumulate fluoride-Within fermenting "plaques", the pH decreased significandy more without fluoride IP

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“…The pieces were stored in plastic tubes with moist cotton wool to prevent drying. For the attach ment of incubation tubes to the enamel surface ac cording to the technique demonstrated by Zwemer [1957] and modified by Turlola [1977], a circular groove was drilled on the test surface with a diamond drill. The inner diameter of the drill was 6 mm and the grooves were drilled to a depth of about 1.5 mm.…”

Section: Methodsmentioning

confidence: 99%

Effect of Magnesium and Fluoride on the Fermentative Dissolution of Enamel by a Streptococcal Layer as Measured by Microhardness Tester and a Proton Probe Microanalysis

Luoma¹,

Luoma²,

Räisänen³

et al. 1983

Caries Res

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The effect of fluoride and magnesium on bovine enamel through a fermenting Streptococcus mutans layer was investigated. The enamel slabs with the microbial layer were incubated for 18 h at 37 °C. The addition of fluoride at a concentration of 25 ppm reduced the pH drop in the fermenting ‘plaque’ and also in part the calcium and phosphorus liberated from the enamel. The addition of magnesium at a concentration of 40 ppm alone had no effect on the pH decrease but increased slightly the enamel phosphorus liberation. Adding fluoride and magnesium simultaneously tended to lessen the effect of fluoride on enamel dissolution. Enamel softening was markedly prevented by the addition of fluoride alone and very slightly by the addition of magnesium. The fluoride content both in the surface and the subsurface layer of the enamel was much increased in the presence of added fluoride, especially underneath the fermenting plaque. Adding magnesium to the fermenting plaque decreased the magnesium content of the enamel surface, especially when fluoride was present.

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Lactic Acid Formation By Lactobacilli Exposed to Fluoridized Enamel

Cited by 21 publications

References 14 publications

Alterations by Mg and F of the Fermentative Dissolution of F-Varnished Enamel by a Streptococcal Layer Measured by a Microhardness Tester and a Proton Probe Microanalysis

Alterations by Mg and F of the Fermentative Dissolution of F-Varnished Enamel by a Streptococcal Layer Measured by a Microhardness Tester and a Proton Probe Microanalysis

Enamel microhardness and fluoride uptake underneath fermenting and non‐fermenting artificial plaque

Effect of Magnesium and Fluoride on the Fermentative Dissolution of Enamel by a Streptococcal Layer as Measured by Microhardness Tester and a Proton Probe Microanalysis

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