Normal occlusion is Class I molar relationship.

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

Answer: (D)

Normal occlusion is defined by a Class I molar relationship, where the mesiobuccal cusp of the upper first molar sits in the buccal groove of the lower first molar. This arrangement provides ideal anteroposterior harmony and proper contact between the arches. If the upper first molar is positioned more mesially relative to the lower molar, that describes a Class II malocclusion. If it is positioned more distally, that describes a Class III malocclusion. A scenario described as having no molar relationship isn’t the normal pattern. So the normal, ideal relationship is Class I.