Question

Which of the following statements is TRUE when comparing root trunks of permanent multi-rooted teeth?

a)Root trunks in permanent multi-rooted teeth are typically longer in the mandibular arch compared to the maxillary arch.
b)Root trunks in permanent multi-rooted teeth are generally shorter in the mandibular arch compared to the maxillary arch.
c)Root trunks in permanent multi-rooted teeth are uniform in length regardless of the arch (maxillary or mandibular).
d)Root trunks in permanent multi-rooted teeth vary in length, but there is no consistent pattern between the maxillary and mandibular arches.

Answer 1

The correct statement is that root trunks in permanent multi-rooted teeth are typically longer in the mandibular arch compared to the maxillary arch, supporting stability and proper force distribution in chewing.

Step-by-step explanation:

When comparing root trunks of permanent multi-rooted teeth, the correct statement is: Root trunks in permanent multi-rooted teeth are typically longer in the mandibular arch compared to the maxillary arch. This characteristic allows for a proper distribution of the forces when chewing and provides stability in the lower jaw where there is less bone mass to support the teeth compared to the upper jaw.

The structure of a tooth is another important aspect to consider. A tooth consists of the crown, which is visible above the gum line, and the root, which is embedded within the maxilla or mandible. The pulp cavity contains the root canal and is surrounded by dentin, which in the root is covered by cementum, a hard bone-like layer. The crown's dentin is protected by enamel, the hardest substance in the body.