The document discusses environmental factors that can influence malocclusion, or improper alignment of the teeth. It identifies three main categories of influences: specific causes, genetic influences, and environmental influences. It focuses on environmental influences, describing how pressures and forces from normal physiologic activity like chewing, tongue positioning, breathing, and oral habits can impact dental development if not in proper balance/equilibrium. These forces shape the jaws, teeth, and dental arch size as the face grows. Factors like sucking thumbs and mouth breathing can lengthen the face and cause malocclusion if prolonged.

1. ROLE OF
ENVIRONMENTAL
FACTORS IN THE THE
ETIOLOGY OF
MALOCCLUSION
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2. INTRODUCTION
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3. 3 CATEGORIES
I SPECIFIC CAUSES OF MALOCCLUSION
II GENETIC INFLUENCES
III ENVIRONMENTAL INFLUENCES
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4. ENVIRONMENTAL INFLUENCES
THE ENVIRONMENTAL INFLUENCE
DURING THE GROWTH AND DEVELOPMENT
OF THE FACE , JAWS AND TEETH CONSIST
LARGELY OF PRESSURE AND FORCES
RELATED TO THE PHYSIOLOGIC ACTIVITY.
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5. FORM FUNCTION
RELATIONSHIP
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6. EQUILIBRIUM THEORY
IT STATES THAT AN OBJECT
SUBJECTED TO UNEQUAL FORCES
WILL BE ACCELERATED AND THERE
BY WILL MOVE TO A DIFFERENT
POSITION IN SPACE .
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7. IT FOLLOWS THEREFORE THAT IF
ANY OBJECT IS SUBJECTED TO A
SET OF FORCES BUT REMAINS IN
THE SAME POSITION , THOSE
FORCES MUST BE IN BALANCE
OR EQUILIBRIUM.
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8. EQUILIBRIUM EFFECTS ON
THE DENTITION
THE DURATION OF THE FORCE ,
BECAUSE OF ITS BIOLOGICAL
RESPONSE , IS MORE IMPORTANT
THAN ITS MAGNITUDE .
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9. PRESSURE CONTRIBUTORS ON
THE DENTITION
( 1 ) MASTICATORY FORCES.
( 2 ) LIPS , CHEEK & TONGUE .
( 3 ) EXTERNAL FORCES.
(4 ) PERIODONTAL FIBRES.
( 5 ) PERIODONTAL LIGAMENT.
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10. ROLE OF THE MASTICATORY
FORCES
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11. ROLE OF LIP, CEEK & TONGUE
[ BUCCINATOR MECHANISM]
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12. ROLE OF EXTERNAL SOURCES
( 1 ) ORTHODONTIC APPLIANCES
( 2 ) VARIOUS HABITS.
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13. ROLE OF PERIODONTAL FIBRES
* TRENS SEPTAL FIBRES.
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14. ROLE OF PERIODONTAL
LIGAMENT
* SHOCK ABSORBER
* ERUPTION
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15. EQUILIBRIUM EFFECT ON JAW
SIZE & SHAPE
THE JAWS CAN BE THOUGHT OF
CONSISTING OF A CORE OF BONE TO
WHICH FUNCTIONAL PROCESS ARE
ATTACHED. THE FUNCTIONAL PROCESSES
OF THE BONE WILL BE ALTERED IF THE
FUNCTION IS LOST OR CHANGED.
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16. FUNCTIONAL INFLUENCE
THE
DENTOFACIAL DEVELOPMENT
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17. FUNCTION & DENTAL ARCH SIZE
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18. BITING FORCE & ERUPTION
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19. SUCKING & OTHER HABITS
( 1 ) THUMB SUCKING
( 2 ) TONGUE THRUSTING
( 3 ) MOUTH BREATHING
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20. THUMB SUCKING
TRIDENT FACTORS
( 1 ) INTENSITY
( 2 ) FREQUENCY
( 3 ) DURATION
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21. TONGUE THRUSTING
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22. MOUTH BREATHING
[ RESPIRATORY PATTERN ]
“ ADENOID FACIES “
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23. CONCLUSION
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24. THANK YOU
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