Which succedaneous tooth erupts beneath tooth J?
a. 1
b. 5
c. 10
d. 13
e. 16
The correct answer and explanation is :
The correct answer is b. 5.
Explanation:
To understand which succedaneous tooth erupts beneath tooth J, it’s important to first understand the dental notation system and the concept of succedaneous teeth.
In the Universal Tooth Numbering System, each tooth is assigned a specific number or letter for identification. Tooth “J” refers to the upper left second molar (tooth #19 in the universal system).
Succedaneous teeth are permanent teeth that replace primary (deciduous) teeth. These are the adult teeth that erupt in the place of the baby teeth and are specifically the anterior and premolar teeth, which replace the corresponding primary teeth.
To determine which tooth erupts beneath tooth J, we need to focus on the sequence of tooth eruption and the teeth that succeed primary teeth. In this case, tooth J is a primary second molar. The permanent tooth that replaces it is the permanent first molar, which erupts in the same area but does not replace a primary tooth.
However, the key point to note is that tooth J, as a primary second molar, is not replaced by the first molar (which is a non-succedaneous tooth). Instead, tooth J is replaced by the first permanent tooth in the same sequence, which is the permanent first premolar, which is labeled as tooth 5.
Dental Eruption Pattern:
- Primary teeth (deciduous teeth) fall out to make room for the permanent teeth.
- The first permanent teeth to erupt are the first molars, which don’t replace any primary teeth.
- The second molars are replaced by the first permanent premolars.
Thus, tooth 5, the permanent first premolar, is the tooth that erupts beneath tooth J, the primary second molar.