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Classification of malocclusion in orthodontics

Classification of malocclusion in orthodontics






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    Classification of malocclusion in orthodontics Classification of malocclusion in orthodontics Presentation Transcript

    • Classification of malocclusion ABDULLAH KARAMAT FINAL YEAR BDS FMHCM&D , LAHORE
    • Before going to malocclusion or abnormal occlusion lets ask first , what is normal occlusion ??!!
    • Andrew’s six keys to normal occlusion : 1- Molar inter-arch relationship : -The mesiobuccal cusp of the upper first molar should within the groove between the mesial and middle buccal cusps of the lower first permanent molar -The crown of the upper first molar must be angulated so that its distal marginal ridge occludes with the mesial marginal ridge of the lower second molar.
    • - The mesio-lingual cusp of the upper first molar should occlude in the central fossa of the lower first molar.
    • 2- Mesio-distal crown angulation : The gingival part of the long axis of the clinical crown must be distal to the occlusal part of line passing through long axis of tooth.
    • 3- Labiolingual crown inclination : • When viewed from mesial or lingual side if gingival area of crown is more lingually placed than the occlusal position , it is referred to as positive crown Inclination and vice versa. • The maxillary incisors exhibit a positive crown inclination , mandibular incisors show a slightly negative crown inclination
    • • The maxillary and mandible posterior teeth both have negative crown inclinations.
    • 4- Rotations : • In order to achieve correct occlusion, none of the teeth should be rotated. • Rotated molars and premolars occupy more space in the dental arch than normal. • Rotated incisors may occupy less space than those correctly aligned.
    • • Rotated canines adversely affect esthetics and may lead to occlusal interferences
    • 5- Tight contacts : To consider an occlusion normal , there should be tight contact between adjacent teeth
    • 6-Curve of Spee : A normal occlusion has a flat occlusal plane (the mandibular curve of Spee should not be deeper than 1.5mm).
    • Malocclusion : -Intra arch -Inter arch: Saggital plane Vertical plane Transverse plane
    • 1- Intra arch malocclusions : Distal inclination or tipping Mesial inclination Lingual inclination Buccal inclination Mesial displacement Distal displacement Lingual displacement Buccal displacement
    • infraversion suparversion rotations Mesiolingual or distbuccal Distolingual or mesiobuccal Transposition
    • 2- Inter arch : A- Saggital plane : Edward Angle created a classification of different malocclusions based on the relative antero-posterior (A-P) position of the maxillary first molar regarding the mandibular first molar which may be perceived in a sagittal plane.
    • Class I : When the mesio-buccal cusp of the upper first molar occludes in the mesio-buccal groove of the lower first molar, but there are problems like spacing or crowding.
    • Class II : The upper molars are in a Class II position, which is anterior to the mesiobuccal groove of the lower first molar. There are two subtypes: division 1 division 2
    • Class II Division 1: The molar relationships are like that of Class II and the upper anterior teeth are protruded/proclined resulting in an increased overjet.
    • Class II Division 2: The molar relationships are Class II, but the central are retroclined (inclined towards the palate) and the lateral or canine teeth are proclined (inclined towards the lip). A deep bite is commonly found.
    • Class III : In this case the upper molars are placed posteriorly to the mesiobuccal groove . It can be related to a decreased or reversed overjet. When there is a reversed overjet the lower anterior teeth are found ahead of the upper anterior teeth. The normal occlusion involves the upper teeth overlapping the lower.
    • B- vertical plane : 1. Deep bite or overbite : It is a condition in which there is excessive vertical overlap between upper and lower anteriors
    • 2-Open bite : it is a condition where there is no vertical overlap between upper and lower teeth
    • C- Transverse plane : The transverse arch malocclusions include various types of cross bites
    • Incisor classification :
    • Canine classification :