Question 1

Which of these teeth do not have a furcation on the mesial surface?

Accepted Answer

Maxillary second premolars typically do not have a furcation on the mesial surface because they usually have a single root, unlike the maxillary molars which have multiple roots and can have furcations.

Question 2

Which of the following teeth is most likely to have a facial and a lingual root?

Accepted Answer

The maxillary first premolar is most likely to have a facial and a lingual root, distinguishing it from the other options listed.

Question 3

Which of these teeth have two roots?

Accepted Answer

Mandibular first and mandibular second molars have two roots, while the other teeth listed have only one root.

Question 4

The root trunk on which aspect of a maxillary first molar is the longest?

Accepted Answer

The length of a root trunk varies on the surfaces of a given individual tooth, and this is especially observed for the distal furcation located on maxillary first molars.

Question 5

Which of the following teeth is most likely to have a furcal concavity?

Accepted Answer

The furcal concavity is a groove where the roots of a tooth meet, commonly found in mandibular molars, especially the first molar. Maxillary molars may also have furcal concavities, but they are less frequent and less pronounced.

Question 6

The name of the condition in which teeth within an arch are so crowded that two adjacent teeth contact each other on the root and are connected by cementum is:

Accepted Answer

Concrescence is the condition where two adjacent teeth are united by cementum only, typically due to crowding or trauma, leading to their roots being fused while maintaining separate crowns.

Question 7

Teeth with roots that are broad proximally and have narrow facial and lingual surfaces are which of the following?

Accepted Answer

Mandibular incisors have roots that are broad proximally (mesiodistally) and narrow on the facial and lingual surfaces, which is a distinctive feature of these teeth.

Question 8

All teeth are positioned in the dental arches so that their crowns are oriented or slanted more toward the mesial side and their roots have a more distal orientation except which of the following?

Accepted Answer

The answer of All teeth are positioned in the dental...

Question 9

When permanent teeth have more than one root,there is a portion of the root called the root trunk.The root trunk is between the furcation and the apical foramen.

Accepted Answer

The root trunk is the part of the tooth root that is between the cementoenamel junction and the furcation, not the apical foramen.

Question 10

Cervical enamel projections (CEPs)are "droplets" of enamel that form on the surface of the roots of multirooted teeth generally near the area of a furcation.CEPs are most frequently observed on mandibular molars.

Accepted Answer

The answer of Cervical enamel projections (CEPs)are "droplets" of enamel...

Question 11

Which of the following statements about the clinical crown of a tooth is true?

Accepted Answer

The clinical crown of a tooth may include the anatomic crown and part of the anatomic root. It is the part of the tooth that can be seen in the oral cavity, and its apical limit is determined by the location of the gingival margin. However, it is not simply defined as the part of the tooth covered with enamel, as some teeth may have lost their enamel due to wear or decay but still have a clinical crown that includes part of the root.

Question 12

The proximal surfaces of roots that are narrower on the lingual than on the facial surface are more readily approached from the lingual aspect because there is more proximal space there for the adaptation of instruments.

Accepted Answer

The statement correctly identifies a characteristic of the proximal surfaces of roots that are narrower on the lingual than on the facial surface, and the reason accurately explains why these surfaces are more accessible from the lingual aspect for instrument adaptation. This is due to the anatomical configuration providing more space on the lingual side for the procedure.

Question 13

How many distal root surfaces are there from a facial approach on a maxillary first molar?

Accepted Answer

From a facial approach on a maxillary first molar, there are two distal root surfaces (mesiobuccal and distobuccal) visible. The mesiopalatal surface is not visible from this approach.

Question 14

What term is used specifically for the bone between the roots of a molar?

Accepted Answer

"Interradicular" refers to the area between the roots of a multi-rooted tooth, such as a molar. Choice A ("Furcal") refers to the area where the roots of a tooth split apart. Choice C ("Interseptal") refers to the bone between adjacent teeth. Choice D ("Alveolar") refers to the bone that surrounds and supports the teeth.

Question 15

Which of the following single-rooted teeth has the most convergence or taper of the proximal root surfaces toward the lingual?

Accepted Answer

The maxillary central incisor typically exhibits the most convergence or taper of the proximal root surfaces toward the lingual side among the options provided. This anatomical feature is characteristic of maxillary incisors, which are designed to withstand vertical and lateral forces during biting and chewing.

Question 16

Dentinal hypersensitivity may occur as a result of the removal of cementum during root instrumentation.The goal of root instrumentation is to remove all cementum.

Accepted Answer

The first statement is true because dentinal hypersensitivity can indeed occur following the removal of cementum, which exposes the dentinal tubules. However, the second statement is false because the goal of root instrumentation is not to remove all cementum but rather to remove plaque, calculus, and diseased cementum while preserving as much healthy cementum as possible.

Question 17

The cementoenamel junction (CEJ)has the most proximal incisal or occlusal curvature on which of the following teeth?

Accepted Answer

The cementoenamel junction (CEJ) has the most pronounced curvature on the mesial surface of the maxillary central incisors compared to other teeth.

Question 18

Which of the following statements about furcations is false?

Accepted Answer

The answer of Which of the following statements about furcations...

Question 19

If a tooth with one root were to lose one third of its attachment length,its loss of attachment surface would be greater than one third because the root is larger in the cervical one third of the tooth.

Accepted Answer

The statement is correct because when a tooth loses one third of its attachment length, the actual loss of attachment surface is indeed greater than one third due to the anatomical tapering of the tooth's root, making it larger at the cervical third. The reason correctly explains this phenomenon, highlighting the relationship between the root's shape and the proportion of attachment surface lost.

Question 20

Which of the following general statements about the root of a single-rooted tooth is correct?

Accepted Answer

From a facial or lingual view, the root of a single-rooted tooth often has a slight distal inclination compared to the crown's midline, which is a common anatomical characteristic.

Quiz 26: Root Morphology and Instrumentation Implications