Objective To explore a suitable culture environment for tissue-engineered teeth and to evaluate the developmental ability of full tooth germs,dental papilla and enamel organ in sub-renal capsule space.Methods Rat fetus at embryonic day 18(ED18) were obtained by Cesarean section.The full first molar germs were separated from fetus,and to separate them further into enamel organ and dental papilla by microsurgery.Subsequently,full tooth germ,enamel organ and dental papilla were transplanted into sub-renal caps...