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CLASSIFICATION OF
MALOCCLUSIONBy,
Dr.Arun kumar.G Reader, Dept. of Orthodontics &
Dentofacial orthopedics, College of Dental sciences.
CLASSIFICATION SYSTEM
• IS A GROUPING OF CLINICAL CASES OF SIMILAR APPEARANCE FOR EASE IN HANDLING AND DISCUSSION,IT IS
NOT A SYSTEM FOR DIAGNOSIS ,METHOD FOR DETERMINING
PROGNOSIS OR A WAY OF DEFINING TREATMENT
OC UPCLUSION CLOSING
“CLOSING UP”
THE RELATIONSHIP OF THE MAXILLARY AND MANDIBULAR TEETH WHEN THE JAWS ARE CLOSED IN CENTRIC RELATION WITHOUT STRAIN OF MUSCULATURE OR DISPLACEMENT OF CONDYLES IN THEIR FOSSAE.
DEFINITION
NORMAL AND IDEAL OCCLUSION
“NORMAL” IMPLIES TO THE VARIATIONS AROUND AN
AVERAGE OR MEAN VALUE.
“IDEAL” IS A HYPOTHETICAL CONCEPT OR A STANDARDIZED GOAL.
SIX KEYS OF NORMAL OCCLUSION
1.MOLAR INTER-ARCHRELATIONSHIP
2.MESIODISTAL CROWN ANGULATION
3.LABIOLINGUAL CROWN INCLINATION
4.ABSENCE OF ROTATION
5.TIGHT CONTACTS
6.CURVE OF SPEE
LINE
OF
OCCLUSION
CATERNARY
CURVE
ANY DEVIATION IN NORMAL OCCLUSION.
WHY TO CLASSIFY?
REASONS FOR CLASSIFYING
TO GROUP CERTAIN MALOCCLUSIONS TOGETHER WHICH MAY OR MAY NOT HAVE THE SAME ETIOLOGY.
EASE OF REFERENCE, COMPARISON AND COMMUNICATION.
THINKING OF THE POSSIBLE TREATMENT MODALITIES THAT MAY BE NEEDED IN A PARTICULAR CASE.
VARIOUS SYSTEMS OF CLASSIFICATION
ANGLE SYSTEM AND ITS MODIFICATIONS
SIMONS SYSTEM
AETIOLOGICAL CLASSIFICATION
BAUME CLASSIFICATION OF PRIMARY TEETH
ACKERMANN AND PROFITT CLASSIFICATION
BALLARDS CLASSIFICATION
WHO CLASSIFICATION
ANGLE SYSTEM
BY EDWARD HARTLEY ANGLE
WAS CONSIDERED THE FATHER OF MODERN ORTHODONTICS
BASED ON THE ANTERO POSTERIOR RELATIONSHIP OF THEJAWS WITH EACH OTHER
CONSIDERS MAXILLARY FIRST PERMANENT MOLAR
CLASS II DIVISION I
DIVISION IITYPE ATYPE BTYPE C
CLASS IIITRUE
PSUEDO
CLASS II SUB DIV
CLASS III SUB DIV
SHORT COMINGS OF ANGLE’S CLASSIFICATION
DOES NOT CONSIDER MALOCCLUSION IN VERTICAL AND TRANSVERSE PLANE.CANNOT BE APPLIED IF FIRST PERMANENT MOLARS ARE MISSING.CANNOT BE USED IN DECIDUOUS DENTITION.DOES NOT INDICATE THE ETIOLOGY OF MALOCCLUSION.NO SKELETAL RELATIONSHIP IS CONSIDERED MALFUNCTIONS OF MUSCLES AND BONES ARE OVERLOOKED.DOES NOT INDICATE THE COMPLEXITY OF THE PROBLEM.
MODIFICATIONS
HOWARDS
TAYALORS
LISCHERS
DEWEYS
LISHERS MODIFICATION
NEUTROCCLUSION DISTOCCLUSION MESIOCCLUSION BUCCOCCLUSION LINGUOCCLUSION SUPRAOCCLUSION INFRAOCCLUSION MESIOVERSION DISTOVERSION TRANSVERSION AXIVERSION TORSIVERSION
DEWEYS MODIFICA TION
ANGLES CLASS I
TYPE I CROWDED ANTERIORS
TYPE 2 MAXILLARY INCISORS ARE PROCLINED AND SPACED
TYPE 3 ANTERIOR CROSS BITE
TYPE 4 POSTERIOR CROSSBITE
TYPE 5 IS SIMILAR TO TYPE 1 BUT IS DUE TO DRIFTING OF TEETH
ANGLES CLASS II
NO MODIFICATIONS
ANGLES CLASS III
TYPE I OVERLAPED BY MAXILLARY MANDIBULAR INCISORS ARE CROWDED AND INCISORS
TYPE II UPPER AND LOWER ANTERIORS ARE IN EDGE TO EDGE RELATION
TYPE III ANTERIOR CROSS BITE
HOWARDS MODIFICATION
ANGLES CLASS II GROWTH PROBLEM
ANGLES CLASS I NON GROWTH PROBLEM
TAYLORS MODIFICATION
BIMAXILLARY PROTRUSION CLASS IV
SIMON CLASSIFICATION
FRANKFORT HORIZONTAL PLANE
ORBITAL PLANE
MID SAGITAL PLANE
ATTRACTION
ABTRACTION
PROTRACTION
RETRACTION
CONTRACTION
DISTRACTION
ADVANTAGES
1 . 3 DIMENSIONAL - MORE PRECISE
2. LAYS EMPHASIS ON THE ORIENTATION OF DENTAL ARCHES TO THE FACIAL
SKELETON
DISADVANTAGES
IT IS TIME CONSUMING AND CUMBERSOME
BAUME CLASSIFICATION OF PRIMARY TEETH
STRAIGHT OR FLUSH TERMINAL PLANE
MESIAL STEP
DISTAL STEP
CLASS IOR
CLASS II
CLASS IOR
CLASS III
CLASS II
ETIOLOGICAL CLASSIFICATION
BY MOYER'S
OSSEOUS
MUSCULAR
DENTAL
BALLARD'S CLASSIFICATION
CLASS I CLASS II CLASS III
VENN DIAGRAM
ACKERMAN AND PROFIT CLASSIFICATION
DIAGRAMATIC CLASSIFICATION OF MALOCCLUSION IN 1960
STEP 1ALIGNMENT
ANDSYMMETRY
IDEALCROWDING
SPACING
STEP 2
PROFILE
AND
DIVERGENCE
STRAIGHT (ORTHOGNATHIC)CONVEX
CONCAVE
STEP 3
STRAIGHTANTERIORPOSTERIOR
TRANSVERSE PLANEBUCCO LINGUAL
RELATIONSHIP OF POST TEETH
STEP 4 SAGITAL PLANE
STEP 5
ANGLES CLASS I ANGLES CLASS IIANGLES CLASS III
VERTICAL PLANE
OPEN BITEDEEP BITE
SKELETALDENTAL
BITE DEPTH
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