The Effects of Age and Fluoride Exposure on Fluoride, Citrate and Carbonate Content of Human Cementum

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Abstract
A study was conducted to determine the values of several chemical components of dental cementum. Extracted teeth from continuous residents of low, optimal, and high natural fluoride areas were selected to determine the effects of fluoride exposure and age on the fluoride, citrate and carbonate content of cervical and apical areas of sound and periodontally diseased human cementum. 1. For normal cementum the mean fluoride content of all 18 groups was 0.443 plus or minus 0.04%on an ash basis and 0.253 plus or minus 0.02% on a dry weight basis; the mean citrate content was 1.52 plus or minus 0.10% on an ash basis and 0.86 plus or minus 0.06% on a dry weight basis; the mean carbonate content was 4.95 plus or minus 0.39% on an ash basis and 2.79 plus or minus 0.22% on a dry weight basis. 2. For diseased cementum the mean fluoride content of all 12 groups was 0.575 plus or minus 0.03% on an ash basis and 0.342 plus or minus 0.02% on a dry weight basis; the mean citrate content was 1.19 plus or minus 0.07% on an ash basis and 0.71 plus or minus 0.05% on a dry weight basis; the mean carbonate content was 5.95 plus or minus 0.47% on an ash basis and 3.50 plus or minus 0.28% on a dry weight basis. 3. There is a general increment in fluoride content of normal cervical and apical cementum, both with age and fluoride exposure. For diseased cementum this held true for fluoride exposure but not age. 4. The mean fluoride content of cervical cementum is greater than that of apical cementum for both normal and diseased groups. For citrate and carbonate no definite statistical differences were noted between cervical and apical areas. 5. The diseased cementum has a significantly higher mean fluoride content, a significantly lower citrate content, and a slightly, but not statistically significant, higher carbonate content than normal cementum. 6. Unlike bone, no inverse fluoride/citrate or fluoride/carbonate relationship was observed. 7. For both normal and diseased groups the carbonate content of cementum of individuals over age 40 tended to be lower than for individuals 20-40 years of age.

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