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Comparative study of B content and δ 11 B in the enamel of isolated teeth from brothers in the same family
Author(s) -
Li Zixia,
Miao Hong Wen,
Li Bin Kai,
Lu Hai
Publication year - 2021
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.9171
Subject(s) - brother , chemistry , enamel paint , incisor , molar , dentistry , oral health , molar mass , medicine , sociology , anthropology , organic chemistry , polymer
Rationale The quantity of boron (B) and its isotopic ratios in tooth can provide information on dietary habits and oral health of individuals. These metrics are gradually being used in stomatology, environmental science and geochemistry. Methods This study measured the B concentration and δ 11 B in the enamel of isolated teeth from brothers in the same family living in high‐B‐exposure areas at different times using inductively coupled plasma mass spectrometry (ICP‐MS) and multicollector ICP‐MS. Results The results demonstrate that B content in tooth samples of two brothers is related to the time of shedding. The earlier the time of shedding, the lower is the B content in tooth. The B content increased from 20.5 μg/g of the central incisor (6–7 years old) of the younger brother to 50.4 μg/g of the second molar (10–12 years old). And B content for the elder brother increased from 28.7 to 58.3 μg/g at the same positions. In the same family, the diet and environmental input of B is basically similar, and the B exposure is basically the same every year. The annual growth rate of B for the younger brother in this experiment is about 4.98 μg/g per year and that for the elder brother is about 4.93 μg/g per year. The δ 11 B of shed teeth at different times from the same person is basically similar, but different from person to person. The δ 11 B of shed teeth from the elder brother varies from 15.5‰ to 17.9‰ and from the younger brother varies from 5.2‰ to 6.7‰. The δ 11 B is quite different for the brothers in the same family who had the same food and environmental intake of B. Conclusions The experimental data confirmed the relationship between the information of B (B content and δ 11 B) in shed teeth and B exposure. They provided an experimental basis using modern human teeth to apply B‐isotope paleo‐environmental significance.