TEETH TYPESFORMULAERUPTION BY DR MANISHA MISHRA 1 Tooth

TEETH TYPES/FORMULA/ERUPTION BY DR. MANISHA MISHRA 1

Tooth Eruption Lower teeth -usually erupt first, beginning as early as 6 months after birth. Most children have a full set of primary teeth by the time they are 3 years old. The child’s jaws continue to grow, making room for the permanent (adult) teeth that will begin to erupt at about age 6 years. 2

• Primary teeth begin to shed between ages 6 and 7 years. • This process continues until about age 12 years. • Temporary (primary)-20 • Permanent(adult)-32 3

CHRONOLOGY OF ERRUPTION OF TEETH PRIMARY TEETH Mandibular Teeth: • A=6 -6⅟ 2 months • B=6⅟ 2 -7 months • C=16 -20 months • D=12 -16 months • E=20 -30 months Maxillary Teeth: • A=7 -7⅟ 2 months • B=7⅟ 2 -8 months • C=16 -20 months • D=12 -16 months • E=20 -30 months

Permanent teeth: Mandibular Teeth: • 1=6 -7 years • 2=7 -8 years • 3=9 -10 years • 4=10 -11 years • 5=11 -12 years • 6=6 years • 7=11 -12 years • 8=17 -21/18 -25 years Maxillary Teeth: • 1=7 -8 years • 2=8 -9 years • 3=11 -12 years • 4=9 -10 years • 5=10 -11 years • 6=6 years • 7=11 -12 years • 8=17 -21/18 -25 years

6

• Dental Formula No. and types of teeth is written as a dental formula for each side of mouth with • Dentition: The teeth in the dental arch • Primary dentition: Deciduous teeth/milk teeth/baby teeth • Permanent dentition: Adult teeth • Mixed dentition : The complement of teeth in the jaws after eruption of some of the permanent teeth, but before all the deciduous teeth are shed. • Precocious dentition: Abnormally accelerated appearance of the deciduous or permanent teeth. • Retarded dentition : Abnormally delayed appearance of the deciduous or permanent teeth. upper and lower teeth in separate rows Terms regarding dentition : 7

Surfaces of a tooth • • • Lingual /Palatal Surface Labial/ Buccal Surface Occlusal surface/ Biting surface Mesial surface –Towards the front Distal surface – Towards the back 8

MALOCCLUSION • Problems due to an abnormal relation of upper and lower teeth resulting in disturbed function or appearance E. g: To chew. 9

MALOCCLUSION TYPES: • Type I: A malocclusion where your bite is OK ( top teeth line up with your bottom teeth) but teeth are crooked, crowded or turned. • Type II: Malocclusion where your upper teeth stick out past your lower teeth. This is also called an overbite or back teeth. • Type III: Malocclusion where your lower teeth stick out past your upper teeth. This is also called an under bite. 10

Class I with severe crowding and labially erupted canines 11

class II molar relationship 12

TOOTH NOTATION 1. FDI two digit notation (Fédération Dentaire Internationale) or World Dental federation 2. Universal notation 3. Palmer notation (Zsigmondy system ) 13

FDI Two-digit notation Notation for Adults: • Central incisors-1 • Lateral -2 • Canine-3 • 1 st Premolar-4 • 2 nd Premolar-5 • 1 st Molar-6 • 2 nd Molar-7 • 3 rd Molar-8 14

• The permanent teeth quadrants are designated 1 to 4 and primary from 5 TO 8. – upper right-1( 5 in baby teeth) – upper left- 2 (6 in baby teeth) – lower left- 3 (7 in baby teeth) – lower right- 4 (8 in baby teeth) 1 5 4 2 6 Baby teeth notation 8 7 3 Permanent and primary teeth notation 15

• So tooth identification done by two digit combination i. e. • combination of the quadrant and tooth – The upper right central incisor- 11 (one, one) – The upper left central incisor- 21( two, one) – The lower left permanent first molar is 36 (three, six) First digit is quadrant no. n 2 nd digit is tooth no. Can be used in computer 16

FDI Two-Digit Notation Chart Permanent Teeth Upper Right Upper Left 18 17 16 15 14 13 12 11 21 22 23 24 25 26 27 28 48 47 46 45 44 43 42 41 31 32 33 34 35 36 37 38 Lower Right Lower Left 17

FDI Two-Digit Notation Chart Baby Teeth Upper Right Upper Left 55 54 53 52 51 61 62 63 64 65 85 84 83 82 81 71 72 73 74 75 Lower Right Lower Left 18

UNIVERSAL NOTATION: Tooth Notation UR UL LL LR • 3 rd molar 1, 16, 17, 32 • 2 nd molar 2, 15, 18, 31 • 1 st molar 3, 14, 19, 30 • 2 nd bicuspid 4, 13, 20, 29 • 1 st bicuspid 5, 12, 21, 28 • Canine 6, 11, 22, 27 • lateral incisor 7, 10, 23, 26 • central incisor 8, 9, 24, 25 19

Primary teeth: Tooth Notation UR, UL, LL, LR 2 nd molar A, J, K, T 1 st molar B, I, L, S Canine C, H, M, R lateral incisor D, G, N, Q central incisor E, F, O, P 20

Palmer Notation • Draw quadrant • Indicate the tooth by no. (1 -8) • Can’t be used in computer PERMANENT TEETH Upper right Upper left 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 Lower right Lower left 21

Palmer permanent dentition 22

BABY TEETH Upper right Upper left E D C B A A B C D E Lower right Lower left 23

24