TOOTH MOVEMENT AND ERUPTION. Tooth eruption. eruption takes place in chronological order involves active eruption – vertical movement of the tooth as opposed to passive eruption – receding of the gingiva how it occurs is not understood
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-as the tooth erupts, the portion of the epithelium covering the crown pulls back and exposes the crown
-the cervical portion of the epithelium is still attached to the neck of the tooth (figure 6-28)
-this fused tissue serves as the initial junctional epithelium (thin dotted line) and creates a seal between the tooth and the surrounding tissue
-i.e. as the tooth pierces the oral epithelium, the cells of the reduced dental epithelium and the oral epithelium form the initial junctional epithelium (thin dotted line)
-the REE portion of this junctional epithelium becomes replaced by oral epithelium
-later replaced by the definitive dentogingival junction