INBDE (Integrated National Board Dental Examination) Practice Exam

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What is the difference called between the combined MD width of canine + primary molars and permanent canine + permanent premolars?

Leeway space
Bolton's discrepancy
Primate space
Arch space

The correct answer is: Leeway space

The correct answer is A. Leeway space. Leeway space refers to the difference in the combined mesiodistal (MD) width of the primary canines and molars compared to the permanent canines and premolars. This space allows the permanent premolars to replace the primary molars, even though the permanent premolars are wider than the primary molars. The leeway space assists in accommodating larger permanent dentition within the arch. The other options are not relevant to the difference between the combined MD width of primary and permanent teeth. B. Bolton's discrepancy relates to the difference in size ratios between the upper and lower teeth. C. Primate space refers to the natural space present mesial to the primary canines in the maxillary and mandibular arch. D. Arch space is a more general term and does not specifically refer to the difference in MD width between primary and permanent teeth.