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Angles classification & its shortcoming 2 (2) /certified fixed orthodontic courses by Indian dental academy
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Angles classification & its shortcoming 2 (2) /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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Angles classification & its shortcoming 2 (2) /certified fixed orthodontic courses by Indian dental academy Angles classification & its shortcoming 2 (2) /certified fixed orthodontic courses by Indian dental academy Presentation Transcript

  • INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  • ANGLE’SANGLE’S CLASSIFICATIOCLASSIFICATIO NN Angle believed that since biologic entities asAngle believed that since biologic entities as well as inanimate elements can be arranged intowell as inanimate elements can be arranged into well-defined classes, the same held also of thewell-defined classes, the same held also of the occlusion of the teeth and the shape of the face.occlusion of the teeth and the shape of the face. Angle based his classification of malocclusion onAngle based his classification of malocclusion on the normal mesiodistal relations of the mesiobuccalthe normal mesiodistal relations of the mesiobuccal cusps of the upper first molars in relation to thecusps of the upper first molars in relation to the mandibular first molars.mandibular first molars. www.indiandentalacademy.com
  • ANGLE’SANGLE’S CLASSIFICATIOCLASSIFICATIO NN Basis for Angle’s classificationBasis for Angle’s classification Most indicative irregularity of teeth found in antero-posteriorMost indicative irregularity of teeth found in antero-posterior relationship of the teeth and the jaws.relationship of the teeth and the jaws. There is a normal mesio distal or antero-posterior position forThere is a normal mesio distal or antero-posterior position for the body of the mandible with its superimposed mandibularthe body of the mandible with its superimposed mandibular dental arch to occupy in the anatomy of the skull.dental arch to occupy in the anatomy of the skull. The maxillary dental arch being built upon a base that is aThe maxillary dental arch being built upon a base that is a fixed section of the skull anatomy, is more or less stable in itsfixed section of the skull anatomy, is more or less stable in its relationship to various landmarks on the head and consequentlyrelationship to various landmarks on the head and consequently the first molar teeth in this arch may be quite safely selected asthe first molar teeth in this arch may be quite safely selected as a key tooth from which to judge the relationship of mandibulara key tooth from which to judge the relationship of mandibular dental arch and intern to the body of mandible upon which it isdental arch and intern to the body of mandible upon which it is locatedlocated www.indiandentalacademy.com
  • ANGLE’SANGLE’S CLASSIFICATIOCLASSIFICATIO NN Basis for Angle’s classificationBasis for Angle’s classification If there is shifting of maxillary molars in theirIf there is shifting of maxillary molars in their relationship to the skull anatomy, this variation can berelationship to the skull anatomy, this variation can be detected by changes in the axial inclination of teeth indetected by changes in the axial inclination of teeth in the maxillary arch. The axial change is especiallythe maxillary arch. The axial change is especially manifested by canine teeth.manifested by canine teeth. Curvature and line of occlusion is unique to eachCurvature and line of occlusion is unique to each individualindividual.. www.indiandentalacademy.com
  • ANGLE’SANGLE’S CLASSIFICATIOCLASSIFICATIO NN Angle used the Roman numerals I, II and III toAngle used the Roman numerals I, II and III to designate the three main classes of mesiodistal archdesignate the three main classes of mesiodistal arch relationship viz., Class I or normal, Class II or distal andrelationship viz., Class I or normal, Class II or distal and Class III or mesial relationship of the cusps of theClass III or mesial relationship of the cusps of the mandibular first molars to the maxillary first molars.mandibular first molars to the maxillary first molars. He employed the Arabic numerals 1 and 2 toHe employed the Arabic numerals 1 and 2 to denote divisions of the classifications. Unilateraldenote divisions of the classifications. Unilateral deviations he termed subdivisions.deviations he termed subdivisions. www.indiandentalacademy.com
  • ANGLE’SANGLE’S CLASSIFICATIOCLASSIFICATIO NN Angle classified malocclusion as followsAngle classified malocclusion as follows Class IClass I Class IIClass II Division 1Division 1 Division IIDivision II SubdivisionSubdivision Class IIIClass III SubdivisionSubdivision www.indiandentalacademy.com
  • ANGLE’SANGLE’S CLASSIFICATIOCLASSIFICATIO NN Class I MalocclusionClass I Malocclusion The mandibular dental arch and the body of theThe mandibular dental arch and the body of the mandible are in normal relation to the maxillary archmandible are in normal relation to the maxillary arch indicated by the fact that mesiobuccal cusp of theindicated by the fact that mesiobuccal cusp of the maxillary first permanent molar occludes in the buccalmaxillary first permanent molar occludes in the buccal groove of the mandibular permanent first molar andgroove of the mandibular permanent first molar and the mesiolingual cusp of the maxillary first molarthe mesiolingual cusp of the maxillary first molar occludes with the occlusal fossa of the mandibular firstoccludes with the occlusal fossa of the mandibular first permanent molar when the jaws are in centricpermanent molar when the jaws are in centric occlusionocclusion www.indiandentalacademy.com
  • ANGLE’SANGLE’S CLASSIFICATIOCLASSIFICATIO NN www.indiandentalacademy.com
  • ANGLE’SANGLE’S CLASSIFICATIOCLASSIFICATIO NN Class II MalocclusionClass II Malocclusion The mandibular dental arch and the body of theThe mandibular dental arch and the body of the mandible are in distal relation to the maxillary arch bymandible are in distal relation to the maxillary arch by half the width of the maxillary first permanent molarhalf the width of the maxillary first permanent molar or mesioodistal width of a premolar indicated by theor mesioodistal width of a premolar indicated by the fact that mesiobuccal cusp of the maxillary firstfact that mesiobuccal cusp of the maxillary first permanent molar occludes in the space between thepermanent molar occludes in the space between the mesiobuccal cusp of the mandibular permanent firstmesiobuccal cusp of the mandibular permanent first molar and the buccal cusp of the second premolar.molar and the buccal cusp of the second premolar. www.indiandentalacademy.com
  • ANGLE’SANGLE’S CLASSIFICATIOCLASSIFICATIO NN Class II MalocclusionClass II Malocclusion The mesiolingual cusp of the maxillary first molarThe mesiolingual cusp of the maxillary first molar occludes mesial to the mesiolingual cusp of theoccludes mesial to the mesiolingual cusp of the mandibular first permanent molar when the jaws are inmandibular first permanent molar when the jaws are in centric occlusioncentric occlusion.. www.indiandentalacademy.com
  • ANGLE’SANGLE’S CLASSIFICATIOCLASSIFICATIO NN www.indiandentalacademy.com
  • ANGLE’SANGLE’S CLASSIFICATIOCLASSIFICATIO NN Class II MalocclusionClass II Malocclusion Division IDivision I A class II malocclusion in which maxilary incisorsA class II malocclusion in which maxilary incisors are in labioversionare in labioversion SubdivisionSubdivision A class II division I malocclusion occuring onA class II division I malocclusion occuring on only one sideonly one side www.indiandentalacademy.com
  • ANGLE’SANGLE’S CLASSIFICATIOCLASSIFICATIO NN Class II MalocclusionClass II Malocclusion Division IIDivision II A class II malocclusion in which maxilary incisorsA class II malocclusion in which maxilary incisors are not in labioversion rather they are retroclinedare not in labioversion rather they are retroclined with laterals overlapping centrals or canineswith laterals overlapping centrals or canines overlapping lateralsoverlapping laterals SubdivisionSubdivision A class II division I malocclusion occuring onA class II division I malocclusion occuring on only one sideonly one side www.indiandentalacademy.com
  • ANGLE’SANGLE’S CLASSIFICATIOCLASSIFICATIO NN Class III MalocclusionClass III Malocclusion The mandibular dental arch and the body of theThe mandibular dental arch and the body of the mandible are in mesial relationship to the maxillarymandible are in mesial relationship to the maxillary arch indicated by the fact that mesiobuccal cusp of thearch indicated by the fact that mesiobuccal cusp of the maxillary first permanent molar occludes in themaxillary first permanent molar occludes in the interdental space between the distal aspect of the distalinterdental space between the distal aspect of the distal cusp of the mandibular first permanent molar and thecusp of the mandibular first permanent molar and the mesial aspect of the mesial cusp of the secondmesial aspect of the mesial cusp of the second permanent molarpermanent molar www.indiandentalacademy.com
  • ANGLE’SANGLE’S CLASSIFICATIOCLASSIFICATIO NN www.indiandentalacademy.com
  • ANGLE’SANGLE’S CLASSIFICATIOCLASSIFICATIO NN Class III MalocclusionClass III Malocclusion SubdivisionSubdivision A class III malocclusion in which malocclusion isA class III malocclusion in which malocclusion is only unilaterallyonly unilaterally www.indiandentalacademy.com
  • ANGLE’SANGLE’S CLASSIFICATIOCLASSIFICATIO NN Pseudo-Class III MalocclusionPseudo-Class III Malocclusion In this condition the mandible is protruded a little duringIn this condition the mandible is protruded a little during the final stages of closure in order to avoid a prematurethe final stages of closure in order to avoid a premature contact of incisors or caninescontact of incisors or canines This is most likely to arise in cases where theThis is most likely to arise in cases where the relationship of the incisors is edge-to-edge, and may berelationship of the incisors is edge-to-edge, and may be caused by a mildly prenormal relationship of the dentalcaused by a mildly prenormal relationship of the dental basesbases Such pseudo – or postural Class III cases may tend, ifSuch pseudo – or postural Class III cases may tend, if left untreated, to become established by a furtherleft untreated, to become established by a further development of the whole occlusion in Class III relation.development of the whole occlusion in Class III relation. www.indiandentalacademy.com
  • Features True Class III Pseudo Class III 1 Profile Concave Straight to concave 2 Etiology Hereditary Habitual/developmental 3 Premature contacts Absent Present 4 Path of closure Forward Deviated 5 Gonial angle Increased/decreased Normal 6 Retrusion of mandible further Not possible Possible 7 Treatment Orthopedic or surgical Elimination of prematurities, replacement of lost posterior teeth 8 Left untreated No further changes Becomes established into true class III Differences between true and pseudo class III malocclusionDifferences between true and pseudo class III malocclusion www.indiandentalacademy.com
  • ANGLE’SANGLE’S CLASSIFICATIOCLASSIFICATIO NN Drawbacks of Angle’s ClassificationDrawbacks of Angle’s Classification The Angle classification was readily acceptedThe Angle classification was readily accepted by the dental profession, since it brought order out ofby the dental profession, since it brought order out of what previously had been confusion regarding dentalwhat previously had been confusion regarding dental relationships. It was recognized almost immediately,relationships. It was recognized almost immediately, however, that there were deficiencies in the Anglehowever, that there were deficiencies in the Angle system.system. www.indiandentalacademy.com
  • ANGLE’SANGLE’S CLASSIFICATIOCLASSIFICATIO NN Drawbacks of Angle’s ClassificationDrawbacks of Angle’s Classification Angle considered malocclusion only in antero-posteriorAngle considered malocclusion only in antero-posterior planeplane Angle considered maxillary first permanent molar as aAngle considered maxillary first permanent molar as a fixed point but it was not found sofixed point but it was not found so The classification cannot be applied if first permanentThe classification cannot be applied if first permanent molars are missing or extractedmolars are missing or extracted The classification cannot be applied in the deciduousThe classification cannot be applied in the deciduous dentitiondentition www.indiandentalacademy.com
  • ANGLE’SANGLE’S CLASSIFICATIOCLASSIFICATIO NN Drawbacks of Angle’s ClassificationDrawbacks of Angle’s Classification The classification does not differentiates betweenThe classification does not differentiates between skeletal and dental malocclusionsskeletal and dental malocclusions The classification does not highlight the etiology of theThe classification does not highlight the etiology of the malocclusionmalocclusion Individual tooth malpositions have not been consideredIndividual tooth malpositions have not been considered in the classificationin the classification www.indiandentalacademy.com
  • www.indiandentalacademy.com Thank you For more details please visit www.indiandentalacademy.com