HUBUNGAN EKONOMI KELUARGA DAN PENDIDIKAN IBU DENGAN EARLY CHILDHOOD CARIES (ECC) ANAK USIA 12-36 BULAN DI KECAMATAN MEDAN DENAI: RELATIONSHIP OF FAMILY ECONOMIC AND MOTHER EDUCATION WITH EARLY CHILDHOOD CARIES (ECC) AMONG CHILDREN 12-36 MONTHS AGED IN DISTRICT MEDAN DENAI - Essie Octiara (TALENTA, 2012)