Root formation

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Root formation

  1. 1. Root Formation• Takes place as the crown is completely shaped and the tooth begins to erupttherefore the tooth forms from the “top down” – i.e. crown to root• Root formation is through the formation of a cervical loop• The CL is the most cervical portion of the enamel/dental organ – two layersconsisting of IEE and OEE• The CL begins to grow down into the dental sac it forms a Hertwigs rootsheath grows down to encompass all but the basal portion of the pulp thissheath shapes the root and induces dentin formation in the root area by theODs of the dental papilla• This sheath lacks the stellate reticulum and stratum intermedium• The root of the tooth is composed by dentin and cementum• Dentin forms when the outer cells of the dental papilla are induced todifferentiation into ODs• Similar to what occurs at the crown area• Influenced by Hertwig’s root sheath• The ODs then undergo dentinogenesis and secrete predentin• After dentin formation – the BM disintegrates along with the Hertwig’ssheath4The root is beginning to form as an extension of the innerand outer dental epithelia in the cervical loop region(circles) which form a bilayered structure calledHertwig’s epithelial root sheath.

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