Classification mal occlusion /certified fixed orthodontic courses by Indian dental academy

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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.

Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
0091-9248678078

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Classification mal occlusion /certified fixed orthodontic courses by Indian dental academy

  1. 1. www.indiandentalacademy.com INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com
  2. 2. OCCLUSION • RELATIONSHIP OF THE MAXILLARY AND MANDIBULAR TEETH WHEN THE JAWS ARE CLOSED IN CENTRIC RELATION WITHOUT STRAIN IN THE MUSCULATURE OR DISPLACEMENT OF THEIR CONDYLES IN THEIR FOSSA www.indiandentalacademy.com
  3. 3. TERMINOLOGY • Anteroposterior: Overjet • Vertical: Deep overbite, Openbite • Transverse : Cross bite www.indiandentalacademy.com
  4. 4. NORMAL OCCLUSION • In terms of molar relation. www.indiandentalacademy.com
  5. 5. • Line of occlusion: Teeth should be arranged in a smoothly (catenary) curving line of occlusion. www.indiandentalacademy.com
  6. 6. MALOCCLUSION • It is the normal departure from normal relationship of teeth in the same arch or teeth of the opposite arch. www.indiandentalacademy.com
  7. 7. MALOCCLUSION TYPES • Dental (Dento-alveolar): abnormal relationship between the teeth themselves. • Skeletal: Both the upper and lower dentition may be normal but there may be associated skeletal defect. • Skeleto-dental: Combination www.indiandentalacademy.com
  8. 8. CLASSIFICATION • It is grouping of clinical cases having similar appearance and makes ease in comparison handling and discussion www.indiandentalacademy.com
  9. 9. PURPOSE OF CLASSIFICATION • Diagnosis and treatment planning • Comparison • Communication • Thinking of the possible treatment modalities that may be needed in a particular case. www.indiandentalacademy.com
  10. 10. • ANGLE SYSTEM: Modifications: Lischers, Deweys, Howards, Taylors • SIMON SYSTEM • ETILOGICAL CLASSSIFICATION BY MOYERS • ACKERMANN AND PROFFIT CLASSIFICATION • BALLARDS SKELETAL CLASSIFICATION www.indiandentalacademy.com
  11. 11. ANGLES CLASSIFICATION • Edward H. Angle in 1899 • Class I malocclusion • Class II malocclusion • Class III malocclusion www.indiandentalacademy.com
  12. 12. CLASS I MALOCCLUSION • Lower dental arch is in normal relation to the upper dental arch. • Mesiobuccal cusp of the upper Ist molar occludes with the mesiobuccal groove of the lower first molar. • Irregularity of the individual teeth with normal dental arches. • 60 - 70% of all cases of malocclusion fall into this class.www.indiandentalacademy.com
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  15. 15. CLASS II MALOCCLUSION • The distobuccal cusp of upper first permanent molar occludes in the mesiobuccal groove of the lower first permanent molar. • Class II division 1 • Class II division 2 • Class II subdivision 1 • Class II subdivision 2www.indiandentalacademy.com
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  20. 20. Class II div 1 Extraoral features: • Convex profile • Deep mentolabial sulcus • Hyperactive mentalis muscle • Hypotonic upper lip • Incompetent lips www.indiandentalacademy.com
  21. 21. Class II div 1 Intraoral features: • Class II canine and molar relationship • Increased overjet and overbite • Deep curve of spee • Constricted maxillary arch www.indiandentalacademy.com
  22. 22. Class II div 2 Extraoral: • Competent lips • Well balanced face • Flat mandibular plane Intraoral: • Class II canine • Class II molar • Upper centrals: Retroclined • Upper laterals :Proclined • Upper arch: U shape • Supraeruption: lower ant. • Infraeruption: Lower post. www.indiandentalacademy.com
  23. 23. CLASS III MALOCCLUSION • Upper permanent IInd premolar occludes with the buccal groove of the lower Ist permanent molar. • Constitutes to about 3% of malocclusion • also called Prenormal occlusion or Mesiocclusion. www.indiandentalacademy.com
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  26. 26. Class III malocclusion Extraoral features: • Concave profile • Mentolabial sulcus: Flat • Hypotonic lower lip • Hypertonic upper lip • Prominent chin Intral oral features: • ClassIII canine & molar • Reverse overjet • Curve of spee : Flat • Lingual inclination of lower incisors www.indiandentalacademy.com
  27. 27. True Class III • Heriditary in nature • There is a definite skeletal defect and exhibits the following charecteristics: → Normal maxilla with prognathic mandible → Retruded maxilla with normal mandible → Combination of the above www.indiandentalacademy.com
  28. 28. Pseudo Class III • Can occur due to following reasons: • Early loss of deciduous posterior teeth - Functional type of malocclusion. • Cleft lip & palate condition: Surgery is done in the early stage - retrained growth of the maxilla results - Psedo class III. • Presence of occlusal prematurities may deflect the mandible forward. www.indiandentalacademy.com
  29. 29. DRAWBACKS OF ANGLE’S CLASSIFICATION • First permanent molars are not fixed points in the skull anatomy. • The classification of malocclusion is based on the anteroposterior relationship only. • The individual tooth malposition cannot be visualised. • When the Ist molars are extracted, this classification cannot be applied. www.indiandentalacademy.com
  30. 30. DRAWBACKS OF ANGLE’S CLASSIFICATION • This classification cannot be applied to deciduous dentition. • The severity of malocclusion cannot be judged from this classification. www.indiandentalacademy.com
  31. 31. INCISOR CLASSIFICATION • Class I: Lower incisal edges occlude with the middle part of the palatal surface of the upper incisors • Class II: Lower incisal edges lie posterior to the middle part of the palatal surface of the upper incisors. • Class III: Lower incisal edges lie anterior to the middle part of the palatal surface of the upper incisors. www.indiandentalacademy.com
  32. 32. MODIFICATIONS OF ANGLE’S CLASSIFICATION • LISCHERS MODIFICATION • DEWEYS • HOWARDS • TAYLORS www.indiandentalacademy.com
  33. 33. LISCHERS MODIFICATION Suffix “Version” indicate the direction from the normal position. • Mesioversion • Infraversion • Labio/Buccoversion • Axiversion • Supraversion • Torsiversion • Transversion www.indiandentalacademy.com
  34. 34. DEWEY’S MODIFICATION He has divided Angle’s Class I into 5 types: • Type 1: Maxillary incisors are crowded and rotated • Type 2: Maxillary incisors are proclined and spaced • Type 3: Anterior crossbite • Type 4: Posterior cross bite • Type 5: Similar to type I but is due to driftig of teeth. www.indiandentalacademy.com
  35. 35. DEWEY’S MODIFICATION Angles Class III into 3 types: • Type 1: Mandibular incisors are crowded and overlapped by maxillary incisors. • Type 2: Upper and lower anteriors are in edge to edge. • Type 3: Anterior crossbite. www.indiandentalacademy.com
  36. 36. HOWARD’S MODIFICATION: • Angle’s Class II: Growth problem • Angle Class I: No growth problem TAYLOR’S MODIFICATION Bimaxillary protrusion: As Angle’s Class IV www.indiandentalacademy.com
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  38. 38. THANK YOU For more details please visit www.indiandentalacademy.com www.indiandentalacademy.com

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