Fig. 5

Sequence of incisor tooth eruption. Part a shows eruption of incisors 1 and 2. The most medial incisor tooth (incisor 1) is the first incisor to erupt through the gingival surface. Penetration of the gingiva starts at the lateral angle of the occlusal surface. In most cases, this is followed by eruption of incisor 2, also penetrating at the lateral angle. Part b shows eruption of incisor 1, but in this case, incisor 3 has erupted before incisor 2, which is still covered by the gingival mucosa. The figure also shows that the sequence of incisor tooth eruption varies between cases as both specimens originate from a 253-day-old Holstein fetus. Anterior part of the right hemimandible stained with D&C Red 33