This document discusses the development of occlusion from birth through the primary dentition period. It defines occlusion and outlines the various stages of occlusal development, including the pre-dentate period, deciduous dentition period, and mixed dentition period. Key details are provided on the eruption sequence and characteristics of primary teeth and changes that occur in arch dimensions over time.

1. Development of
Occlusion
From Birth upto Primary
Dentition

2. DEFINITION
 (derived from the latin word occluso)
 OCCLUSION IS DEFINED AS RELATIONSHIP
BETWEEN ALL THE COMPONENTS OF
MASTICATOR SYSTEM IN NORMAL FUNCTION,
DYSFUNCTION AND PARAFUNCTION

3. THE VARIOUS STAGES OF
OCCLUSAL DEVELOPMENT
1. PREDENTATE JAW RELATIONSHIP
2. DECIDUOUS DENTITION PERIOD
3. MIXED DENTITION PERIOD
4. PERMANENT DENTITION PERIOD

4. THE PREDENTATE PERIOD
6 MONTHS AFTER BIRTH
GUM PADS- ALVEOLAR PROCESS AT
TIME OF BIRTH
DENTAL GROOVE
TRANSVERSE GROOVES
GINGIVAL GROOVE
LATERAL SULCUS
COMPLETE OVERJET
INFANTILE OPEN BITE

6. • NATAL TEETH- TEETH FOUND TO
HAVE ERUPTED AT THE TIME OF
BIRTH
• NEONATAL TEETH- ERUPT DURING
FIRST MONTH OF LIFE

7. DECIDUOUS DENTITION PERIOD
ERUPTION OF ALL PRIMRY TEETH IS
COMPLETED BY 2.5-3.5 YRS OF AGE
SEQUENCE OF ERUPTION- A-B-D-C-E
BETWEEN 3-6 YRS THE DENTITION IS
RELATIVELY STABLE

8. 6 mos
7 mos
7.5 mos
9 mos
12 mos
14 mos
16 mos
18 mos
20 mos
24 mos

9. Status of Dentition

10. SOME OF THE CHARACERISTIC CLINICAL
FEATURES OF DECIDUOUS DENTITION ARE
1. BOTH THE DENTAL ARCHES ARE HALF ROUND
OR OVOID IN SHAPE
2. ALMOST NO CURVE OF SPEE IS PRESENT
3. SHALLOW CUSPID INTERDIGITATION
4. SLIGHT OVERJET
5. DEEP BITE
6. VERTICAL INCLINATION OF INCISORS
7. SPACED DENTITION
8. DIFFERENT MAXILLOMANDIBULAR
RELATIONS
1. FLUSH TERMINAL PLANES
2. MESIAL STEP TERMINAL PLANES
3. DISTAL STEP TERMINAL PLANES

12. SPACING
• DELABARRE(1918) WAS FRIST TO
DESCRIBE INTERDENTAL SPACING
SPACING IN PRIMARY DENTITION
• BAUME-1950-
DENTITION
SPACED
PRIMATE
SPACES
PHYSIOLOGIC
SPACES
NON-SPACED

14.  ANTERIOR TEETH RELATIONSHIP
OVERBITE
EDGE TO EDGE BITE
OVERJET

15. CANINE RELATIONSHIP
 CLASS I
 CLASS II
 CLASS III

16. ARCH DIMENSIONS
o ZIGMONDY 1890
o FRANK & BAUME- CHANGES THAT TAKE
PLACE IN ARCH BY LOSS OF PRIMARY
TEETH AND DEVELOPMENT OF
OCCLUSION
ARCH SIZE
ARCH LENGTH
ARCH CIRCUMFERENCE
ARCH WIDTH

17. BIBLIOGRAPHY
• TEXTBOOK OF ORTHODONTICS-
BHALAJI
• TEXTBOOK OF PEDIATRIC
DENTISTRY- NIKHIL MARWAH