Chemical and Physical Studies of Enamel From Human Teeth

Br, Bhussry

doi:10.1177/00220345590380021901

J Dent Res

1959

DOI: 10.1177/00220345590380021901

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Chemical and Physical Studies of Enamel From Human Teeth

Bhussry Br

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Cited by 18 publications

References 8 publications

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The effect of strontium, cobalt and fluoride on rat incisor enamel formation

Neiman

Eisenmann

1975

Anat. Rec.

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This investigation examined ultrastructurally the entire period of development of alterations in formative ameloblasts and the enamel which they produce following injection with fluoride, strontium, and cobalt ions. Rats injected with these ions were sacrificed at intervals of 1, 2, 4, 8, 16, 24 and 48 hours to elucidate the sequence and detail of cytologic and cell product alterations which occur. Undecalcified sections of rat incisor teeth were studied using electron microscopy and microradiography. All three ions initially produced disturbances in cell morphology and enamel formation consisting of dark globules, vacuoles, and pooling of stippled material on the enamel surface. While a period of decreased crystal formation occurred after injection with all three ions, only cobalt responses included a period of apparently complete absence of crystal formation. The hypermineralized layers occurring in the altered enamel are attributed to changes in the rate of enamel matrix formation and duration of its exposure to tissue fluids. Morphologic changes in Tomes' process were observed at the time of formation of abnormel following injection of all three ions. These observations are compared with previous studies of altered enamel formation and analyzed with the goal of learning more about the mechanisms of amelogenesis.

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The effect of strontium, cobalt and fluoride on rat incisor enamel formation

Neiman

Eisenmann

1975

Anat. Rec.

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Scanning electron microscopical study on the fluorosis of enamel in rats

Satoh

Ogura

1978

Calc. Tis Res.

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Sixteen 28-day-old male rats of Wistar strain, with a mean body weight of 179 g, were divided into two equal groups. Each group of eight animals was maintained for 70 days on drinking water, ad lib., containing no fluorine (control group) and 100 ppm of fluorine (experimental group). All specimens examined were obtained from the incisal portions of the incisors. The following types of enamel specimens were prepared for scanning electron microscopy: (1) acid-etched specimens; (2) acid-etched specimens followed by low temperature microincineration; and (3) fractured specimens. The enamel formed during high fluoride exposure showed marked hypocalcification, that is, the crystallite density in the prism core and interprismatic region was lower than that of control animals. The organic substances appeared to increase in these regions. The changes were prominent in the outer and middle enamel layers. Such changes following fluoride administration appear to indicate an inhibition of enamel maturation, that is, an inhibition of the mineral deposition and/or an inhibition of organic matrix withdrawal.

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Effect of long-term administration of fluoride on physico-chemical properties of the rat incisor enamel

Satoh

1975

Calc. Tis Res.

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Rats were maintained on drinking water containing different amounts of fluoride (0, 9, 23 45, 68, and 113 ppm) for 70 days. Physico-chemical properties of the incisor enamel were examined after fluoride administration, using contact microradiography, histochemistry, and microhardness tests. The tooth enamel formed during high fluoride exposure showed marked hypocalcification. Much of organic substance in the enamel seemed to have been retained. In addition, the microhardness of enamel showed a marked decrease. These changes were most prominent in the outer region of enamel and were proportional to the concentration of fluoride administered. Such changes following fluoride administration indicated inhibition of enamel maturation, i.e., an inhibition of the progressive depposition of minerals and/or in inhibition of organic matrix withdrawal by ameloblasts. Enamel seemed more affected by fluoride than dentine.

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Chemical and Physical Studies of Enamel From Human Teeth

Cited by 18 publications

References 8 publications

The effect of strontium, cobalt and fluoride on rat incisor enamel formation

The effect of strontium, cobalt and fluoride on rat incisor enamel formation

Scanning electron microscopical study on the fluorosis of enamel in rats

Effect of long-term administration of fluoride on physico-chemical properties of the rat incisor enamel

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