Department of Pediatric Dentistry Nihon University Graduate School of Dentistry at Matsudo Chiba Japan;
Department of Pediatric Dentistry Nihon University School of Dentistry at Matsudo Chiba JapanNihon University Research Institute of Oral Science Chiba Japan;
Department of Pediatric Dentistry Nihon University School of Dentistry at Matsudo Chiba JapanNihon University Research Institute of Oral Science Chiba Japan;
Rats; Tooth Root Morphology; Powder Diet; Extraction of Molars; Micro-CT;