Normal occlusion is characterized by which molar relationship?

• A. Class II molar relationship
• B. Class I molar relationship
• C. Class III molar relationship
• D. No molar relationship

Answer: (B)

Normal occlusion is defined by a Class I molar relationship, in which the mesiobuccal cusp of the upper first molar fits into the buccal groove of the lower first molar. This alignment allows proper contacts between the upper and lower teeth and balanced function. If the upper molar is positioned ahead of the lower, it becomes a Class II relationship; if it sits behind, it’s Class III. The idea of “no molar relationship” isn’t a standard description of occlusion.