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Longitudinal changes in the skeletal pattern of deciduous anterior crossbite
K Nagahara1, T Suzuki, S Nakamura
1Department of Orthodontics, Aichi-Gakuin University, School of Dentistry, Nagoya, Japan.
The Angle Orthodontist
|January 1, 1997
Summary
Some children with anterior crossbite see spontaneous correction as permanent teeth emerge. Differences in jaw position and tooth alignment at the initial exam predict whether the anterior crossbite resolves naturally.
Area of Science:
- Dentistry
- Orthodontics
- Pediatric Dentistry
Background:
- Anterior crossbite in deciduous dentition can self-correct during the transition to permanent teeth.
- Understanding the factors influencing spontaneous resolution is crucial for early intervention strategies.
Purpose of the Study:
- To investigate initial differences and longitudinal changes in patients with self-correcting versus persistent anterior crossbite.
- To identify cephalometric predictors for spontaneous anterior crossbite resolution.
Main Methods:
- Longitudinal observation of 220 anterior crossbite patients in deciduous dentition.
- Classification into three groups based on crossbite status after permanent incisor eruption.
- Cephalometric analysis of initial jaw position, mandibular growth, and tooth axis.
Main Results:
- Patients with spontaneous correction (Group N) exhibited a more posterior mandibular position and smaller inferior facial lengths initially.
- Persistent crossbite groups (R1, R2) showed lingual tipping of lower incisors and, in R2, a smaller maxilla.
- Longitudinal analysis revealed increased maxillary length and suppressed mandibular growth in Group N, while Groups R1 and R2 showed stable maxillary positions.
Conclusions:
- Initial mandibular position and facial morphology are key indicators for predicting spontaneous anterior crossbite correction.
- Lingual tipping of lower incisors and maxillary underdevelopment are associated with persistent anterior crossbite.
- Growth patterns, including maxillary lengthening and controlled mandibular growth, contribute to the resolution of anterior crossbite.