Angle Classifications Flashcards
Dentally-the mesiobuccal cusp of the upper first permanent molar articulates in the buccal groove of the lower first molar
Class 1 (neutroclusion)
Facially- Well balanced (straight, orthognathic or mesiognathic profile) unless there is a soft tissue discrepancy
Class 1 (neutroclusion)
Skeletally- the mandible is slightly posterior to the maxilla
Class 1 (neutroclusion)
Dentally-the mesiobuccal cusp of the upper first permanent molar articulates ANTERIOR to the buccal groove of the lower first molar
Class 2 (DISTOCLUSION)
Facially- upper lip may appear protrusive or lower lip and chin retrusive (RETRO-GNATHIC CONVEX profile)
Class 2 (DISTOCLUSION)
Skeletally- the mandible is retruded or maxilla is protruded or a combination of both
Class 2 (DISTOCLUSION)
Malocclusion:
3 identifiers
Described by
Characteristic
Identified in ANTEROposterior, TRANSVERSE, and VERTICAL dimensions
Described in relation the the affected tissue (TEETH, BONE, MUSCULATURE)
is UNIQUE to the INDIVIDUAL patient
Lischer’s Nomenclature
System for naming various dental malocclusions
- Mesioversion
- Distoversion
- Linguoversion
- Labioversion/Beccoversion
- Infraversion
- Supraversion
- Axioversion
- Torsiversion
- Transversion
- Mesially displaced
- Distally displaced
- Displaced towards tongue
- Displaced towards lip or cheek
- Superior to the occlusal plane in maxilla/inferior to the occlusal plane in the mandible
- Inferior to the occlusal plane in the maxilla/superior to the occlusal plane in the mandible
- Tipped/inclines
- Rotated
- In the wrong order in the dental arch
ALL upper incisors are proclined (tipped facially at the Incisal edge)
Class 2 division 1
Upper LATERAL incisors are proclined or rotated while the upper CENTRAL incisors are retroclined (tipped lingually at the incisal edge)
Hint:Kurtis McConnell case
Class 2 Division 2
Skeletally- the maxilla is retruded or mandible is protruded or a combination of both
Class 3 (MESIOCLUSION)
Dentally- the mesiobuccal cusp of the upper first permanent molar articulates POSTERIOR to the buccal groove of the lower first molar
Class 3 (MESIOCLUSION)
Upper lip may appear protrusive or lower lip and chin restrusive
Retro-gnathic convex profile
Upper lip may appear retrusive or lower lip and chin protrusive.
Prognathic concave profile
Over bite is Negative
Open Bite
Over bite is excessively positive
Deep bite
Vertical Component of Malocclusion
Upper incisors overlap the lower incisors vertically, this relationship is referred to as over bite
Relationship between the maxilla and mandible/ upper and lower first permanent molar relationship
ANTEROposterior Component of Malocclusion
The upper dental arch occludes slightly buccally and facially to the lower dental arch ( positive anterior over jet and buccal overjet present)
Transverse Component of Malocclusion
Head and neck musculature can influence facial bone structure since forces acting upon bone influence bone structure.
Any influence over bone position can affect the relationship of teeth since teeth are situated in bone
Wolf’s Law
Etiologic (cause) Agents act on head and neck muscle, bone, and teeth to produce malocclusion.
Examples:
Heredity
Developmental Defects (ex: cleft palate)
Trauma (ex:fractures of jaws/teeth)
Habits: Habitual application of undesirable force to bone can cause malocclusion (ex: thumb/finger sucking, tongue thrust)
Physical (ex: over retained deciduous teeth)
Head and neck musculature can influence facial bone structure since forces acting upon bone influence bone structure.
Any influence over bone position can affect the relationship of teeth since teeth are situated in bone
Wolf’s Law
Etiologic (cause) Agents act on head and neck muscle, bone, and teeth to produce malocclusion.
Examples:
Heredity
Developmental Defects (ex: cleft palate)
Trauma (ex:fractures of jaws/teeth)
Habits: Habitual application of undesirable force to bone can cause malocclusion (ex: thumb/finger sucking, tongue thrust)
Physical (ex: over retained deciduous teeth)
