PALAllI, S.: Milan, Italy (Oct. 3, 1938).

 [From translation by Martha Teach Gnudi.]

Persons are caries-receptive or caries-immune. These differences express particular organic structures related to multiple factors, among which those determined by endocrine glands are of great importance. Caries in human teeth originates from both general and local causes. Among general condi­tions are those that weaken the organism (illnesses that have a strongly de­calcifying influence, serious anemias, and other disturbances in the composition and circulation of the blood, repeated errors in diet, prolonged fasts, etc.). Among local causes are factors that produce chemical changes in enamel, whether alimentary (sugars) or oral in origin. Caries is less frequent in persons on exclusively vegetarian diets.

Reference: None submitted.

PEDERSEN, P. O.: Dental School, Copenhagen, Denmark (Sep. 22, 1938).

InGreenlandthere has been great increase in caries. This dental deteri­oration is closely related to progress in civilization, and to accompanying marked alterations in native diets.

The author’s investigations included three groups : (a) 526 ancient Eskimo skulls from Greenland, (b) 915 modern East Greenlanders, and (c) 1,634 modern South-West Greenlanders. In ancient Greenland Eskimos, incidence of caries was exceedingly low. Of 526 skulls examined, having 7,606 permanent teeth, only two skulls showed caries. No deciduous teeth were affected. For modern East Greenlanders and West Greenlanders, the principal data are shown in Table 4. In modern Greenlanders, liability to caries is greater in M3 than in M1 and M2. In the villages, occlusal caries prevails ; at trading stations, interproximal and gingival caries also occur. [The author is now leading, for his School, its Third Dental Greenland Expedition. His return is expected on or about Sep. 15, 1939. —Ed.]

Reference: Den. Record, 1937.

TABLE 4

Data on caries in modern Greenlanders

Localities

Percentage of persons affected in

Percentage of teeth affected

Perm. teeth

Decid. teeth

Permanent

Deciduous

East Greenland

Villages

Trading stations

0-12.9*

25.0-75.0

0— 1.8

22.2-66.7

0— 1.2

2.0-12.0

0— 1.3

7.6-16.0

West Greenland

Villages

Trading stations

16.4-67.5

60.0-96.4

26.8-53.1

88.9-93.3

2.5— 9.2

7.9-35.9

8.7-12.4

39.7-69.3

 

* Each set of figures (in all columns) shows minimal and maximal values in five age-groups.

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