Flush Terminal Plane

# If a flush terminal plane is present in the deciduous dentition then the molars will erupt:
a) Initially in class I occlusion
b) Initially in class II occlusion
c) Initially in class III occlusion
d) End to end

The correct answer is D. End to End

Baume's classification of primary molars

Flush terminal plane : 
• The distal surface of upper and lower second deciduous molars are in one vertical plane.
• The permanent molars will erupt in a flush or end on relationship.

Mesial Step:
• The distal surface of lower second deciduous molar is more mesial to that of upper second deciduous molar.
• Mesial step- (normal mesial step of < 2mm, which is more common)- The permanent molars will erupt in Angle's class-I occlusion
• Exaggerated Mesial step of >2 mm- The permanent molars will erupt in Angle's classIII occlusion

Distal Step:
• The distal surface of lower second deciduous molar is distal to that of upper second deciduous molar.
• The permanent molars may erupt in Angle's class-II occlusion.

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