Class 1,2,3 Flashcards
What’s class 2 occlusion ?
It’s a disto-occlusion is a skeletal type of malocclusion where mandibular teeth are in a distal ( posterior) relationship with there normal maxillary opponents .
What’s the appearance of chin and profile in class 2 occlusion ?
The person will be with receded chin .
Profile is convex with retruded mandible , RETROGNATHIC .
Explain the molars relation in class 2 occlusion ?
Mesiobuccal groove of mandibular first molar , distal to MB cusp of maxillary first molar by a distance at least the width of a premolar .
In which situations we call it tedency toward class 2 occlusion ?
When mandible is distal to where it located in person with class 1 , and alignment differs by less distance that the width of premolar .
There is 2 subdivisions of class 2 , they are based upon what ?
Based on inclination and overlap of maxillary incisors .
What’s class 2 division 1 ?
Nmaxillary incisors labial inclination is similar to incisors found in normal class 1 occlusion .
What’s the unique oral trait that people with class 2 subdivision 1 exhibit ?
Severe horizontal overjet of maxillary incisors labial to mandibular incisors .
What’s class 2 subdivision 2 ?
Maxillary central incisors , are retruded with severe lingual inclination whereas
the laterals are labially inclined (labially flared ).
Patients with class 2 subdivision 1 have another unique morphology what’s ?
Very little horizontal overjet but a severe vertical overbite .
What’s class 3 ?
It’s a mesio-occlusion skeletal type , where mandibular dental arch is anterior to maxillary arch .
What’s the relative sizes of maxilla and mandible in class 3 ?
Large mandible compared to maxilla .
What’s the relative sizes of maxilla and mandible in class 3 ?
Large mandible compared to maxilla .
What’s the fascial profile and chin appearance in class 3 ?
Concave profile prognathic ( protruded mandible ) , very prominent chin .
What’s the molars relation in class 3 ?
Mesiobuccal groove of mandibular first molar mesial to MB of maxillary first molar .
By at least premolar width .
What’s tedency to class 3 ?
When the distance less than the width of premolar .
