Crown is formed, Rim of enamel organ at cervical portion comprises the IEE and OEE at Cervical loop.1.Cervical loop start proliferate to give Hertwig’s epithelium root sheath.2.3. At beginning root sheath bends at angle 45 degree toward the pulp constricting or narrowing the wide cervical opening ofthe crown.Called epithelium diaphragm and opening will become apical foramen.4.Epithelium diaphragm remain constant and free end does not grow. Root sheath grow coronal to diaphragm
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