Immunohistochemical aspects of the evaluation of the inflammatory answer of the dental pulp.

: The inflammatory answer of the dental pulp in front of an antigen presents a series of particularities caused by its special anatomical conditions. The evaluation of the inflammatory answer in the evaluation tests of the biocompatibility of the dental materials is made by histological methods without defining precise quantitative criteria to measure the pulp reaction. In this study, we followed the reaction of the pulp tissue to five antibodies (CD20, CD45Ro, CD4, CD8, and CD68) in order to evaluate the inflammatory aspects of the dental pulp. We did not find positive answers for the CD20 protein, specific for B-lymphocytes, for the fragments of normal pulp tissue taken into study. Even if they are in small number among the pulp cells, the T-lymphocytes that express the protein CD45Ro may be also found in the normal dental pulp. Of the two subsets of T-lymphocytes, we found positive answers on the studied preparations only for the CD8 protein. For the CD68 protein, strongly expressed by the macrophages, we obtained positive results both for the inflammated pulp tissue, and for the normal dental pulp, yet in a very small amount. The use of immunohistochemical techniques, with well-defined markers of the pulp inflammation, can offer better results for a highly accurate evaluation of the inflammatory answer of the dental pulp.