Question

Difference between early and late mesial shift

Answer 1

Mesial shift is a term used in pediatric dentistry with respect to permanent first molars.

Early mesial shift is the movement of lower and upper permanent first molars into primary space in Type I primary dentition. In Type II primary dentition, this shift cannot take place because there is no primary space because of the forces that close the existing spaces. This also causes the arc length to be reduced.

Late mesial shift of the permanent first molars can take place in Type II or closed primary dentition. However, this is only after the exfoliation of the lower second primary molars.

Answer 2

Early menial shift

In vaults with physiologic spacing, the eruptive coercion of perpetual molars prompt the closing of spaces within the initial molar or the initial spaces thus enabling the molars to substitute mesially converting into class I molar relationship.

Late  menial shift

In vaults with no subconscious spacing, the mesial shift of primary permanent molars is diminished till the depilation of the initial molars. After the exfoliation of fundamental molars, the mesial shift of the perpetual molars takes place by constituting the application of leeway space thus mutating into class I Molar association.