Abstract
Crescent shaped bitubercular, tritubercular as well as all deformed teeth tend to the cone shape. The malformation of these teeth results from pre-congenital trophic change in dentine development. It consists in dwarfing and notching the cutting and grinding edges of the second set of teeth, a familiar example is the so-called Hutchinson's teeth, usually referred to a syphilitic etiology. Hutchinson's position has, however, been more strongly stated than his words justify since he admits that in at least one-tenth the cases luetic etiology could be excluded.<sup>8</sup> Lues only plays the part of a diathetic state profoundly affecting the maternal constitution at the time of dentine development. While these teeth may be due to secondary result of lues, they do not demonstrate luetic heredity. In Figure 31 are seen the teeth of an individual affected with constitutional disease and by referring to Figure 15 we shall see that the defective
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