Pulp Healing

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Abstract
The healing process of the dental pulp is studied by exposing healthy, young teeth and covering the exposed tissue with pastes of Ca(OH)2 and water or zinc oxide-euge-nol. The teeth are extracted at intervals varying from 24 hrs. to 12 weeks, and prepd. for histological sections. Within 24 hrs., pulps treated with Ca(OH)2 show a superficial area of necrosis demarcated from healthy tissue by a linear basophilic zone. After 2 weeks, a layer of primitive dentin has been formed against this basophilic zone. Within 4 weeks, new odontoblasts are formed and new dentin is deposited against the primitive type to complete the healing process. The healing observed under Ca(OH)2 is remarkably free of inflammation. No healing occurs in exposed pulps treated with zinc oxide eugenol. After 24 hrs., and area of hemorrhage and acute inflammation is seen. The inflammation becomes chronic and granulation tissue forms at the site of the exposure.
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