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Changes in the molar relationship between the deciduous and permanent dentitions: a longitudinal study.
S E Bishara1, B J Hoppens, J R Jakobsen
1Department of Orthodontics, College of Dentistry, University of Iowa.
Summary
Early dental development, particularly the deciduous dentition
Area of Science:
- Orthodontics
- Pediatric Dentistry
- Dental Development
Background:
- Understanding molar relationship changes from deciduous to permanent dentition is crucial for predicting occlusion.
- Longitudinal studies provide valuable insights into dental development patterns.
Purpose of the Study:
- To describe molar relationship changes from deciduous to permanent dentition.
- To determine associations between dentofacial variables and molar relationship changes in subjects with normal occlusion.
Main Methods:
- Longitudinal analysis of 121 subjects from the Iowa Longitudinal Growth Study.
- Evaluation at three stages: deciduous completion, permanent molar eruption, and permanent dentition completion.
- Assessment of molar relationships, tooth dimensions, arch dimensions, and cephalometric variables.
Main Results:
- 61.6% of deciduous dentition sides developed into Class I molar relationships.
- Distal steps in deciduous dentition predicted Class II permanent molar relationships.
- Mesial steps in deciduous dentition indicated a higher probability for Class I molar relationships.
Conclusions:
- Deciduous molar relationship patterns significantly influence permanent occlusion.
- Early identification of developmental steps can aid in predicting orthodontic outcomes.
- Dentofacial variables play a role in the transition of molar relationships during growth.