OBJECTIVEThe purpose of this study was to investigate the changes of basic fibroblast growth factor (bFGF) expressed in normal human dental pulp at different root development stages of permanent teeth.

METHODSBased on the teeth root development status, the pulp tissues were classified into three groups: root just starting development, being in development and apical closed. The pulps were immunohistochemically examined by use of bFGF antibody.

RESULTSStaining was strongly positive in immature permanent teeth, especially at the stage of root just starting development. Image analysis indicated that the gray values of positive reaction in three groups were statistically different (P < 0.001). For the first group, the gray value of the outer pulp was higher than that of the pulp core. For the second group, the pulp core has a higher gray value in the coronal pulp, while a lower value in root pulp compared to the outer pulp.

CONCLUSIONWith the development of root formation, the expression of bFGF in dental pulp shows different characteristics. bFGF may play a role in dental pulp development and maturation.