TEETH%20TYPES/FORMULA/ERUPTION

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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 childs 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 TEETH
• Mandibular Teeth
• A6-6?2 months
• B6?2-7 months
• C16-20 months
• D12-16 months
• E20-30 months

• Maxillary Teeth
• A7-7?2 months
• B7?2-8 months
• C16-20 months
• D12-16 months
• E20-30 months

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Permanent teeth

• Mandibular Teeth
• 16-7 years
• 27-8 years
• 39-10 years
• 410-11 years
• 511-12 years
• 66 years
• 711-12 years
• 817-21/18-25 years

• Maxillary Teeth
• 17-8 years
• 28-9 years
• 311-12 years
• 49-10 years
• 510-11 years
• 66 years
• 711-12 years
• 817-21/18-25 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 rows
• Terms 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 NOTATION

• 1.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 notation

• Notation 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)

1
2
5
6
Baby teeth notation
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7
4
3
Permanent and primary teeth notation
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• 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
  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

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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

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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, LR
• 2nd molar A, J, K,
  T
• 1st molar B, I,
  L, S
• Canine C, H, M,
  R
• lateral incisor D, G, N,
  Q
• central incisor E, F, O,
  P
•  

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Palmer Notation

• Draw quadrant
• Indicate the tooth by no. (1-8)
• Cant 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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