DEVELOPMENT OF DENTITION
1.PRE-DENTAL PERIOD- birth- 6 months
a. Gum pads
b. Precociously erupted primary teeth
2. DECIDUO...
INDIAN DENTAL ACADEMY
Leader in continuing dental education
www.indiandentalacademy.com

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1. PRE-DENTAL PERIOD- Birth- 6 months
a.GUM PADSThe alveolar processes at the time of birth are known as gum pads

www.ind...








The gum pads are pink, firm and
resilient and are covered by a dense
layer of fibrous periosteum.
Upper gum p...
a. LABIO-BUCCAL PORTIONDifferentiates first and grows more
rapidly.
Divided into 10 segments by grooves
called TRANSVERS...
b. LINGUAL PORTION



Differentiates later.
Remains relatively smooth.
The upper and lower gum pads are
separated from t...
RELATIONSHIP OF GUM PADS-

www.indiandentalacademy.com










Upper gum pad is wider and longer than
the lower gum pad . Thus when
approximated, complete overjet present...
b. PRECOCIOUSLY ERUPTED PRIMARY TEETH1.NATAL TEETH Teeth that are present at the time of birth are called natal
teeth.
 ...
2.NEO-NATAL TEETHTeeth that erupt during 1st month of age
are called neonatal teeth.
Mostly seen in mandibular incisor r...
DEVELOPMENT OF PRIMARY DENTITION Initiation of primary tooth buds occurs during 6
weeks of intrauterine life.
 Primary t...
ERUPTION AGE AND SEQUENCE OF
DECIDUOUS DENTITION SEQUENCE:

A- B- D- C- E

The mandibular central incisors are the 1st to ...
NORMAL FEATURES OF PRIMARY DENTITIONPHYSIOLOGICAL SPACES/ DEVELOPMENTAL SPACES:


Usually seen in deciduous dentition to ...
2. PRIMATE / SIMIAN / ANTHROPOID SPACES Present mesial to deciduous maxillary canine and distal to
mandibular canine.
 C...
3.ALMOST VERTICAL INCLINATION OF
INCISORS

4.SHALLOW OVERJET AND OVERBITE

www.indiandentalacademy.com
TERMINAL PLANE RELATIONSHIPThe mesio- distal relation between the distal surfaces of the upper and
lower 2nd deciduous mol...
b. MESIAL STEPDistal surface of mandibular deciduous 2nd molar
is mesial to the distal surface of maxillary
deciduous 2nd ...
c. DISTAL STEPDistal surface of mandibular deciduous 2nd molar
is more distal than the distal surface of maxillary
2nd mol...






The primary dentition is usually
established by 3 years of age.
Between 3-6 years , the dental arch is
relatively...
www.indiandentalacademy.com
Leader in continuing dental education

www.indiandentalacademy.com
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Gum pads,development of primary dentition /certified fixed orthodontic courses by Indian dental academy

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Gum pads,development of primary dentition /certified fixed orthodontic courses by Indian dental academy

  1. 1. DEVELOPMENT OF DENTITION 1.PRE-DENTAL PERIOD- birth- 6 months a. Gum pads b. Precociously erupted primary teeth 2. DECIDUOUS DENTITION PERIOD 3. MIXED DENTITION PERIOD 4. PERMANENT DENTITION PERIOD www.indiandentalacademy.com
  2. 2. INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  3. 3. 1. PRE-DENTAL PERIOD- Birth- 6 months a.GUM PADSThe alveolar processes at the time of birth are known as gum pads www.indiandentalacademy.com
  4. 4.      The gum pads are pink, firm and resilient and are covered by a dense layer of fibrous periosteum. Upper gum pad : Horse shoe shaped Lower gum pad : ‘U’ shaped Develop in 2 parts: a. Labio-buccal portion b. Lingual portion The 2 portions are separated by a groove called DENTAL GROOVE www.indiandentalacademy.com
  5. 5. a. LABIO-BUCCAL PORTIONDifferentiates first and grows more rapidly. Divided into 10 segments by grooves called TRANSVERSE GROOVES. Each segment consist of one developing tooth sac. The transverse groove between canine and 1st deciduous molar is called the LATERAL SULCUS. www.indiandentalacademy.com
  6. 6. b. LINGUAL PORTION   Differentiates later. Remains relatively smooth. The upper and lower gum pads are separated from the palate and the floor of the mouth respectively by a groove called GINGIVAL GROOVE. www.indiandentalacademy.com
  7. 7. RELATIONSHIP OF GUM PADS- www.indiandentalacademy.com
  8. 8.      Upper gum pad is wider and longer than the lower gum pad . Thus when approximated, complete overjet present all around. Anterior open bite present at rest with contact only in the deciduous 1st molar region. Tongue protrudes anteriorly through this space- helps in suckling Permits eruption of lower incisors without impingement on upper gum pad. Lateral sulcus of mandibular arch is normally distal to that of maxillary arch. www.indiandentalacademy.com
  9. 9. b. PRECOCIOUSLY ERUPTED PRIMARY TEETH1.NATAL TEETH Teeth that are present at the time of birth are called natal teeth.  Usually mandibular incisors.  Show familial tendency. www.indiandentalacademy.com
  10. 10. 2.NEO-NATAL TEETHTeeth that erupt during 1st month of age are called neonatal teeth. Mostly seen in mandibular incisor region and show familial tendency. www.indiandentalacademy.com
  11. 11. DEVELOPMENT OF PRIMARY DENTITION Initiation of primary tooth buds occurs during 6 weeks of intrauterine life.  Primary teeth begin to erupt at about 6 months of age.  Eruption of all primary teeth is completed by 24- 30 months of age www.indiandentalacademy.com
  12. 12. ERUPTION AGE AND SEQUENCE OF DECIDUOUS DENTITION SEQUENCE: A- B- D- C- E The mandibular central incisors are the 1st to erupt at around 6-7 months of age. - Timing of tooth eruption is highly variable. - A variation of 3 months from the mean age has been acceptable as normal. www.indiandentalacademy.com
  13. 13. NORMAL FEATURES OF PRIMARY DENTITIONPHYSIOLOGICAL SPACES/ DEVELOPMENTAL SPACES:  Usually seen in deciduous dentition to accommodate the larger permanent teeth in the jaws.  Absence of spacing in deciduous dentition is an indication that crowding of teeth may occur in permanent dentition. www.indiandentalacademy.com
  14. 14. 2. PRIMATE / SIMIAN / ANTHROPOID SPACES Present mesial to deciduous maxillary canine and distal to mandibular canine.  Commonly seen in primates.  Help in interdigitation of opposing canines.  Used for early shift www.indiandentalacademy.com
  15. 15. 3.ALMOST VERTICAL INCLINATION OF INCISORS 4.SHALLOW OVERJET AND OVERBITE www.indiandentalacademy.com
  16. 16. TERMINAL PLANE RELATIONSHIPThe mesio- distal relation between the distal surfaces of the upper and lower 2nd deciduous molars is called the TERMINAL PLANE 3 TYPES: a. FLUSH TERMINAL PLANE- Distal surfaces of the upper and lower 2nd deciduous molars are in the same vertical plane. - This is regarded as normal relation in deciduous dentition. www.indiandentalacademy.com
  17. 17. b. MESIAL STEPDistal surface of mandibular deciduous 2nd molar is mesial to the distal surface of maxillary deciduous 2nd molar. www.indiandentalacademy.com
  18. 18. c. DISTAL STEPDistal surface of mandibular deciduous 2nd molar is more distal than the distal surface of maxillary 2nd molar. www.indiandentalacademy.com
  19. 19.    The primary dentition is usually established by 3 years of age. Between 3-6 years , the dental arch is relatively stable and very few changes occur in the dentition in this period. The deciduous dentition period lasts for 6 years of age till the eruption of permanent 1st molars which marks the beginning of the mixed dentition period. www.indiandentalacademy.com
  20. 20. www.indiandentalacademy.com Leader in continuing dental education www.indiandentalacademy.com

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