American Board of Orthodontics (ABO) Practice Exam

Question: 1 / 660

According to the Bjork study, what was the average rotation of the maxilla?

-6 degrees

-2.5 degrees

The Bjork study is influential in orthodontic research, especially in understanding maxillary and mandibular movements during growth. According to the findings from this study, the average rotation of the maxilla during normal growth patterns was found to be approximately -2.5 degrees. This negative value indicates that the maxilla tends to rotate downward and backward relative to the cranial base as the individual matures, which is important for orthodontists to consider when planning treatments.

This rotation has implications for how the occlusion and facial profile may change as the patient grows, as well as how treatment modalities can be adjusted to accommodate these natural growth patterns. Understanding this rotation is vital for predicting how the anatomical relationships will evolve and for making informed decisions about interventions.

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-8 degrees

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