Which dentition is physiologic and characterized by each tooth having two antagonists, with the exception of the upper third molar and the lower central incisor?

Which dentition is physiologic and characterized by each tooth having two antagonists, with the exception of the upper third molar and the lower central incisor?

• A. Temporary dentition
• B. I period of mixed dentition
• C. Permanent dentition
• D. II period of mixed dentition

Answer: (C)

In permanent dentition, teeth are expected to contact teeth in the opposite arch, usually giving each tooth two antagonists. This bilateral opposition helps distribute chewing forces evenly and stabilizes the bite as the dentition functions together. There are two well-recognized exceptions to this pattern: the upper third molars often have no true antagonist because the opposing lower molar is missing or positioned so contact doesn’t occur, and the lower central incisors typically have only one antagonist, since their incisal contact is mainly with the upper central incisors rather than two distinct opposing teeth. Because most teeth in the permanent dentition have two antagonists, with these two exceptions, the described dentition is permanent dentition.

In permanent dentition, teeth are expected to contact teeth in the opposite arch, usually giving each tooth two antagonists. This bilateral opposition helps distribute chewing forces evenly and stabilizes the bite as the dentition functions together. There are two well-recognized exceptions to this pattern: the upper third molars often have no true antagonist because the opposing lower molar is missing or positioned so contact doesn’t occur, and the lower central incisors typically have only one antagonist, since their incisal contact is mainly with the upper central incisors rather than two distinct opposing teeth. Because most teeth in the permanent dentition have two antagonists, with these two exceptions, the described dentition is permanent dentition.