Tuesday, November 7, 2017

The effect of premature loss of deciduous molars on premolar eruption


Article Title: The effect of premature loss of deciduous molars on premolar eruption
Author(s): A.L. Posen
Journal: Angle Orthod
Date: 1965
Major Topic: Effect of early loss of primary molars on premolar eruption
Type of Article: Cohort study
Main Purpose: This article aimed to determine the effect premature loss of primary molars has on premolar eruption
Key Points: Children ages 4-5 who lose primary molars early will likely have delayed premolar eruption but the proportion of children with delayed premolar eruption will gradually decrease to almost zero by age 8, when primary molar loss will likely result in accelerated premolar eruption.


Age at primary molar loss
Hastened eruption
“On time” eruption
Delayed eruption
4
0/12
0/12
12/12
5
4/19
1/19
14/19
6
7/15
4/15
4/15
7
19/30
4/30
7/30
8
16/20
3/20
1/20
9 and 10
25/25
0
0

·      Premolar eruption is delayed in patients who lose primary molars at ages 4-5
·      From age 5 to 8, there is a gradual increase in the amount of hastened premolar eruption and decrease in the amount of delayed premature eruption
·      Premolar eruption is accelerated if primary molar is lost between the ages of 8-10
Remarks:
1-
2-
Assessment of Article:  Level of Evidence/Comments: II-3

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