Abstract
A biometric study of 99 germs of dm 2 extracted from foetuses of ages ranging from 12 weeks to term, using a similar method to that previously applied to dm 2, showed that the growth patterns of the two teeth were similar. However, it was found that if, instead of assuming allometry, the data were plotted directly without logarithmic conversion, many of the changes previously ascribed to an interphase are eliminated. The results are consistent with the view that tooth growth is additive rather than exponential, different parts of the tooth starting to grow at different times. After calcification of the first cusp (about 20 weeks), the relative size of the root openings becomes reduced, the cusps tilt apart and total growth decelerates progressively and not suddenly.
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