The dental profession currently recognizes a number of techniques in the pulp therapy of deciduous molar teeth. Periapical cysts with characteristic features have been detected in association with some teeth in which either formocresoI* Krit or Caustinerft have been used. This paper reports clinical, radiographic and histologic features of these cysts.

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The clinical and radiographic features of a group of apical periodontal cysts associated with endodontically treated deeiduous molar teeth have been previously reported. The histologieal deseription and histoehemical investigation of distinctive intraepithelial inclusions are desctibed in this paper. The chtonic inflammatoty response is dominated by plasma cells and the wall contains an amorphous, eosinophilic material that is shown to contain phenolic groupings sitnilar to those present in the inttacanal medicaments used elinically. A direct telationship is proposed between the inclusions, contitiued antigenic stimulation within the lesions and their clinical behaviour.

Abstract— Histological and clinical evidence exists to show that external coronal resorption of unerupted molars does not extend to the pulp chamber. This paper recommends surgical exposure and restoration of these teeth before progression of the resorptive process weakens the coronal tissue to such an extent that a satisfactory restoration is difficult to achieve. Failure to eliminate the defect before eruption may result in microbial contamination, rapid destruction of the underlying dentine, pulpal and periapical pathosis and possibly loss of the tooth.