Effects of oral habits' duration on dental characteristics in the primary dentition

Resident: Adam J. Bottrill
Date: 08JUN11
Region: Providence
Article title: Effects of oral habits' duration on dental characteristics in the primary dentition
Journal: JADA
Page #s: 1685-1693
Vol:No Date: 132, Dec 2001
Major topic: Oral Habits, Primary Dentition
Minor topic(s): None
Type of Article: Longitudinal Study

Main Purpose: The purpose of this study was to assess the effects of different durations of nonnutritive sucking habits on the occlusal relationships and the dental arch characteristics in the primary dentition.

Key points in the article discussion:

I. General:
A. Studies have demonstrated that long-term nonnutritive sucking habits can lead to occlusal abnormalities. Not much known about habits of shorter duration.

II. Methods:
A. Longitudinal data collected on nonnutritive sucking among children through a series of questionnaires. (547 children)
B. Ages 4-5, study models obtained. (526 children)
C. Excluded those with permanent dentition and insufficient descriptive data. (372 children)
D. Dental arch parameters measured
E. Occlusal conditions analyzed for the groups of children with nonnutritive sucking habits of different durations.

III. Results:
A. Only 8 of the 372 children reported no sucking habit.
B. Children with nonnutritive sucking habits that continued to 48 months of age or beyond demonstrated many significant differences from children with habits of shorter duration:
1. narrower maxillary arch widths, greater overjet and greater overjet and greater prevalence of open bite and posterior crossbite.
C. Even when the habit was ceased between 2-3yo, pts still had increased risk of developing posterior crossbite and increased mandibular arch width when compared to those ceasing at 12mo.
D. Those who ceased at 36mo vs 12mo of age had significantly greater mandibular canine arch widths, maxillary canine arch depths and overjet and open bite.
E. Prevalence of anterior open bite, posterior crossbite and excessive overjet increased with duration of habits.

IV. Conclusions:
A. Children with shorter sucking habits also have detectable differences in dimensions
B. As pediatric dentists, we may consider revisiting our suggestions that sucking habits may last until permanent dentition eruption with little concern.
C. Will attempt to follow the children into mixed dentition and draw further conlclusions.
D. Recommending children stop habits prior to 24 months of age is unrealistic.
E. The results of this study suggest 24 months is a realistic and beneficial age to begin the tapering and ceasing of nonnutritive sucking habits.

Assessment of Article: These sucking habits were followed on an ongoing basis and at regular intervals, rather than relying on retrospective gathering of the data. As an observational cohort study, it was not limited to those children "seeking treatment" which lends to it's validity. HOWEVER... This article describes something I believe we all consider intuitive. Longer habit = worsened occlusion