TEETH TYPES/FORMULA/ERUPTION

BY DR. MANISHA MISHRA

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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.

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• 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

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CHRONOLOGY OF ERRUPTION OF TEETH

PRIMARY TEETHMandibular Teeth:• A=6-6⅟2 months• B=6⅟2-7 months• C=16-20 months• D=12-16 months• E=20-30 months

Maxillary Teeth:• A=7-7⅟2 months• B=7⅟2-8 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

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Dental Formula• No. and types of teeth is written as a dental formula for each side of mouth with

upper and lower teeth in separate rowsTerms regarding dentition :

• 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.

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

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MALOCCLUSION

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

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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.

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Class I with severe crowding and labially erupted canines

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class II molar relationship

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TOOTH NOTATION1.FDI two digit notation (Fédération Dentaire Internationale) or World Dental federation

2.Universal notation

3.Palmer notation (Zsigmondy system )

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

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• 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)

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Baby teeth notation

1 2

3

4

5 6

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Permanent and primary teeth notation

• 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 2nd digit is tooth no.Can be used in computer

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FDI Two-Digit Notation Chart

Permanent Teeth

Upper Right Upper Left18 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

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FDI Two-Digit Notation Chart

Baby Teeth Upper Right Upper Left55 54 53 52 51 61 62 63 64 65

85 84 83 82 81 71 72 73 74 75

Lower Right Lower Left

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

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Primary teeth:Tooth Tooth Notation UR, UL, LL, LR2nd molar A, J, K, T1st molar B, I, L, SCanine C, H, M, Rlateral incisor D, G, N, Qcentral incisor E, F, O, P

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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 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 Lower right Lower left

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Palmer permanent dentition

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BABY TEETH

Upper right Upper left E D C B A A B C D E E D C B A A B C D E Lower right Lower left

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