Question 345 · LDEK · Structure of primary teeth

Select the true statements outlining differences between primary and permanent teeth:

1) the surface of primary incisors is smooth and without perikymata;
2) in contrast to immature permanent teeth, incisal edges of primary teeth do not have mamelons.
3) the crown of the primary mandibular second molar is similar to the crown of the permanent mandibular first molar and has four cusps;
4) crowns of permanent teeth are more barrel-shaped;
5) primary molars have flat, broad proximal surfaces, whereas permanent molars have contact points;
6) primary mandibular central and lateral incisors are located on the same level. This changes upon the eruption of permanent incisors.
The correct answer is:

A. 1,2,5,6.
B. 1,4,5,6.
C. 2,3,4,5.
D. 1,2,4,6.
E. 2,3,5,6.

Hint

Compare primary and permanent crowns: surface texture, mamelons, cusp number of the lower second primary molar, crown shape and contacts.

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Select the true statements outlining differences between primary and permanent teeth:

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