Recognition of Malocclusion in the Mixed Dentition

Question 1

the MD occlusion in the mixed dentition is undergoing continual change due to:

Answer 1

• loss of primary teeth
• eruption of permanent teeth
• growth of the face

Question 2

the AP relations of the upper and lower permanent first molars 3/30 and 4/19 are described by:

Answer 2

Angle classification of 1899

Question 3

the AP relations of the second primary molars A/T and J/K are first described by:

Answer 3

Louis J. Baume in 1950

Question 4

if the permanent 1st molars are class I, they will:

Answer 4

remain in class I or become SI in the permanent dentition

Question 5

if the permanent 1st molars are class II they will:

Answer 5

remain class II in the permanent dentition

Question 6

if the permanent 1st molars are class III they will:

Answer 6

remain class III in the permanent dentition

Question 7

what are the terminal planes

Answer 7

the distal surfaces of the upper and lower primary second molars

Question 8

what is a mesial step

Answer 8

when the terminal planes of A and J are distal to the terminal planes of T and K

Question 8

what is a distal step

Answer 8

when the terminal planes of A and J are mesial to the terminal planes of T and K

Question 9

what is a flush terminal plane

Answer 9

when the terminal planes of A and J are vertical or coincident with T and K

Question 10

if the terminal plane of the upper primary molars is 3+mm distal to the terminal plane of the lower primary molar and the permanent 1st molars are end on, the occlusion in the permanent dentition may become:

Answer 10

Class I

Question 11

if the terminal plane of the upper primary molar is flush or mesial to the terminal plane of the lower primary molar and the permanent 1st molars are end on the AP molar relation in the permanent dentition will be:

Answer 11

class II

Question 12

what will be the molar class in the permanent dentition if you have a mesial step

Answer 12

class I or class III

Question 13

what will be the molar class in the permanent dentition if you have a distal step

Answer 13

class II

Question 14

what will be the molar class in the permanent dentition if you have a flush terminal plane

Answer 14

either class I or class II

Question 15

the MD width of primary molars is ______ than the MD width of the permanent premolars

Answer 15

larger

Question 16

primary mandibular molars are _____ than maxillary primary molars

Answer 16

larger

Question 17

what will a distal step become if there is forward growth of the mandible

Answer 17

end to end

Question 18

what will a flush terminal plane be if there is forward growth of the mandible

Answer 18

class I

Question 19

what will a mesial step become if there is forward growth of the mandible

Answer 19

class III

Question 20

what will a mesial step become if there is normal growth of the mandible

Answer 20

class I

Question 21

what will the distal step become if there is normal growth of the mandible

Answer 21

class II