Orthodontics and Pediatric Dentistry
What the exam expects
This domain tests growth and development, occlusion, and the management of the child patient. You must understand the stages of dental development, the classification of malocclusion, and the principles of interceptive and comprehensive orthodontic treatment.
Concepts to master
- Development: primary dentition erupts from about 6 months; mixed dentition begins around 6 years; the leeway space and primate spaces are important for arch development.
- Malocclusion: Angle classification (Class I, II, III) based on the first molar relationship. Crowding, overjet, and overbite are key measurements.
- Interceptive orthodontics: space maintenance, habits, and early correction of crossbites.
- Pediatric dentistry: behavior management, caries prevention (fluoride, sealants), and pulp therapy in primary teeth.
Traps
A common trap is confusing the leeway space with the primate space. Another is misclassifying an Angle class when the molar relationship is atypical. Questions may also test whether a habit appliance is indicated before or after eruption of permanent teeth.
Worked rule of thumb
For a child with crowding, first determine the dental age and the amount of space available. If space loss is due to premature primary tooth loss, consider a space maintainer; if it is due to a habit, address the habit first.
Study strategy
Review the chronology of tooth eruption and the Angle classification. Practice identifying space maintainers and their indications.