CD4 T lymphocytes play a central role in allergic reactions. Thus the present study aimed to, immunohistochemically, evaluate the presence of these lymphocytes in rabbit gingival tissues after the replacement of Cenobone. This experimental one way blinded study was performed on 20 gingival tissues gathered from disease-free rabbits with or without bone powder, respectively groups A and B. Immunohistochemical envision method was performed for mapping CD4 lymphocytes. The number and intensity of staining were compared between groups in 5 consequent HPF without overlap with the light microscope in connective tissue. Data were analyzed by Fisher exact test, Wilcoxon, and chi-square statistically in SPSS20 software. The number of CD4 T cells was higher in group A compared to group B.(P=0.02) Pattern of distribution in connective tissue did not show a difference between the two groups. (P=0.41). Results of the present study might confirm the role of CD4 T in an allergic reaction to bone powder material and suggest this cell as a useful factor for the prediction of allergic reactions in the first weeks of surgery. Further studies in this field are required.
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