. The Dental cosmos. Thibetan. Australian. (Osburn.) first molars in their crypts, about toerupt, may be noted. Before taking up the normal variationof the forms of the head, special atten-tion should be paid to the horizontalplane of the teeth in the dental plane extends from the mesial angle the base of the nose, and the third beingsituated between the base of the nose andthe mental process. The first two areunchangeable areas, while the lower sec-tion may be termed changeable. Thisarea may be divided into four segments,as follows: Segment 1 : From the base GT4 THE DEXTAL

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