dental enamel grade mineralization

The effects of graded levels of dietary zinc on the development and mineralization of teeth and bones and on the susceptibility of teeth to dental caries were studied in young growing rats. Thirty-six weanling male Sprague-Dawley rats were randomly assigned to four dietary treatments: 1) zinc-deficient, less than 1 ppm; 2) 12 ppm zinc; 3) 36 ppm zinc, and 4) 108 ppm zinc. For treatments 2, 3 and 4, rats were pair-fed the quantity of feed consumed by their individual counterparts fed the zinc-deficient diet...

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Degree of mineralization of enamel is one of the parameters mediating in its resistance to acid dissolution and at the stage of teething, the enamel is immature and, therefore, present a higher susceptibility to dental caries. This investigation was carried out with 38 preschool children (means = 5.5 years) and 19 children coursing second grade (means = 7.6 years). They were treated with 10 oral rinsing with mineralizing solution in order to evaluate its effect on enamel resistance to acid dissolution; colorimetric technique was used for such purpose...

X-ray spectral microanalysis was applied to study Ca and P contents in superficial, intermedial and deep enamelum zones in 15 human teeth with different fluorosis manifestations which were extracted for orthodontic purposes. In 3rd grade fluorosis, detected were a statistically reliable decrease in Ca content in enamelum superficial zone and a tendency of its depleting in deep zones. Ca/P ratio was also lowered that indicated mineralization impairment in solid tissues of the teeth. This should affect the choice of the technique of therapy and prevention of different manifestations of teeth fluorosis...

Clinical studies of the relationship between developmental enamel defects and caries susceptibility have often produced conflicting results. This has been due in part to a failure to distinguish between different types of defects. Studies of this association in prehistoric populations have been rare. The complete deciduous dentitions of 57 subadults from the Libben site, a large Late Woodland cemetery in Ottawa County, Ohio, were selected for analysis. Defects were classified as either hypoplasias (deficiencies in matrix apposition) or hypocalcifications (deficiencies in mineralization) and were graded for severity...

The aim of the present study was to describe the structural features characterizing the severe grades of human fluorotic enamel (TF scores 5-9) with particular emphasis on the posteruptive changes in severely fluorosed teeth. Dental fluorosis is a subsurface hypomineralized lesion deep to a well-mineralized outer enamel surface, which in severe cases breaks apart shortly after eruption. Early signs of posteruptive changes comprise small defects corresponding to the opening of striae of Retzius. The enamel pits which develop after eruption in more severe cases exhibit an increase in mineral content at their base which correspond to the exposed subsurface hypomineralized lesions...