Classification Of Malocclusion Flashcards
Is a grouping of clinical cases of similar appaerance for ease in handling and discussion
It is not a system of diagnosis, method for determining prognosis, or way of defining treatment
Classification system
Purpose of classification system
- To group various malocclusions
- in diagnosis
- In treatment planning
- Comparison
- Visualizing and understanding the problem associated with that malocclusion
- Communication
Who invented the purpose of classification
Dr. Charles F. Strang
It is the relationship between all components of the masticatory system in normal function, parafunction and dysfunction including the morphology and function features of the containing surface of the opposing teeth and restoration
Occlusion
3 period of the history on the concept of occlusion
Fictional period
Hypothetical period
Factual period
What curve best describe a normal occlusion
Catenary curve
It is described as simple geometric terms such as elipse, parabola,or modified spheres, etc.
Dental arches
The six keys to normal occlusion was invented by who and what year?
Dr. Lawrence F. Andrews in 1972
What are Dr. Andrew’s keys of normal occlusion
Key 1: Molar relationship
Key 2: Crown angulation
Key 3: crown inclination
Key 4: absence of rotation
Key 5: tight contact
Key 6: curve of speed
What is malocclusion
Defined as any deviation from the ideal occlusion
- Angle
Types of malocclusion
Dental dysplasia
Skeletodental dysplasia
A malocclusion that lacks spaces to accommodate the teeth
Dental dysplasia
Local factors of dental dysplasia
Premature loss or prolonged retention of deciduous teeth
Basic hereditary patterns
Tooth size discrepancy
A malocclusion that has an abnormal relationship between both jaws. Muscle function is usually not normal within this group
Skeletodental dysplasia
Angle’s classification of malocclusion
- Class I (neutrocclusion)
- Class II (distoocclusion)
- Class III (mesioocclusion)
Mesiobuccal cusp of maxillary 1st molar occludes on the mesiobuccal groove of the mandibular 1st molar
Class I angle’s classification of maloccusion
(Neutrocclusion)
Anteroposterior relation of both 1st molars are correct
Essentially a dental dysplasia malocclusion
Class I neutrocclusion
The lower dental arch is in a distal relationship with the upper arch
Class II (distoocclusion)
The distobuccal cusp of the max 1st molar falls on the distobuccal groove of the 1st mandibular molar
Class II distocclusion
Overbtie and overjet are excessive
Upper dental arch assumes a V shape w/c is responsible for the protrusion or labioversion of incisors
Class II division I malocclusion
A malocclusion that is associated with abnormal muscle function of the lip
Class II division I malocclusion
A malocclusion that has an exaggerated curve of spee
Class II division II
Supraversion of the mandibular incisors
Class ii division ii
Excessive lingual inclinatio of the maxillary central incisors
Class II division II
