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A conference paper on instances of mottled enamel in the Chinese population is presented. It discusses teeth abnormalities and describes the discoloration of teeth caused by mottled enamel. Details are provided about the effect of age on mottled enamel incidence and the relationship between mottled enamel and other health problems.

A simple visual stimulus was repeatedly presented to 120 infants 12 and 18 weeks of age until visual fixation reached a habituation criterion. A discrepant stimulus followed that varied in its magnitude of discrepancy from the familiar standard. In contrast to the age effects observed for the rate of habituation (though they interacted with specific stimuli), there were no age differences in the distribution of fixation times to the several magnitudes of discrepancy. Infants who habituated rapidly displayed an inverted-U curve of fixation as a function of discrepancy in accord with the discrepancy hypothesis, whereas slow habituators gave their maximum response to the largest discrepancy. [ABSTRACT FROM AUTHOR]

The article focuses on the effects of pregnancy, mouth acidity, and age on dental caries. An index of caries based on the number of decayed tooth surfaces was quantified for each of 324 pregnant women. The patients received full mouth radiographs, allowances were made for missing teeth, and occlusal grooves big enough to admit the sharp point of an explorer were set down as cavities.

Presents the findings of a study on gastroscopy in a large general hospital from 1951 to 1956. Frequency of gastric lesions in relation to age; Number of benign ulcer cases; Percentage of the incidence of malignancy in the cases studied.