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1. Angle’s Class
I
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2. -CLASS I MALOCCLUSION EXIST
WHEN
THERE IS A HARMONIOUS
RELATIONSHIP OF THE
UNDERLYING
SKELETAL STRUCTURE AND THE
MALOCCLUSION COMPONENT IS
RESTRICTED TO THE DENTAL
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3. Features of Angle’s Class I
 STRAIGHT TO CONVEX PROFILE
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4.  MOLAR RELATION IS ANGLE’S
CLASS I
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5.  INDIVIDUAL TEETH MALOCCLUSION
MAY BE SEEN WITH VARYING
DEGREE OF SEVERITY
 LIP COMPETENCE IS DEPENDENT
ON THE DEGREE OF ANTERIOR
PROCLINATION
 NORMAL MUSCLE FUNCTION
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6. BIMAXILLARY PROTRUSION
NORMAL CLASS I MOLAR RELATIONSHIP
DENTITION OF BOTH THE UPEER AND
LOWER
ARCHES ARE FORWARDLY PLACED
CONVEX TO STARIGHT PROFILE
INCREASED INTER INCISAL ANGLE
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7. www.indiandentalacademy.com

8. ASSOCIATED PROBLEMS
 SPACING- LOCALIZED OR ENTIRE
ARCH MAY BE AFFECTED
ETIOLOGY-
 DISPROPORTION BETWEEN
ARCH LENGTH AND TOOTH MATERIAL
 ALTERATION IN TOTH MORPHOLOGY
 DELETRIOUS HABITS- THUMB SUCKING
AND
TONGUE THRUSTINGwww.indiandentalacademy.com

9.  PRESENCE OF UNERRUPTED
SUPERNUMERARY TEETH OR ANY
PATHOLOGY
 PREMATURE LOSS OF PERMANENT
TEETH
DIAGNOSIS - MODEL ANALYSIS
RADIOGRAPHS
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10. CROWDING
 ARCH LENGTH- TOOTH MATERIAL
DISCREPANCY
 PRESENCE OF SUPERNUMERARY TEETH
 PROLONGED RETENTION OF DECIDUOUS
TEETH
 PREMATURE LOSS OF DECIDUOUS
TEETH
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11. ROTATIONS
 TWO TYPES ARE POSSIBLE
MESIO LINGUALOR DISTO BUCCAL
DISTOLINGUAL OR DISTOBUCCAL
 ANT TEETH THAT ARE ROTATED OCCUPY
LESS SPACE AND THEREFORE REQUIRE
ADDITIONAL SPACE FOR DEROTATION
 POST TEETH OCCUPY MORE SPACE THUS
SPACE IS GAINED WHEN THE TEETH ARE DE
ROTATED
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