Premolar Anatomy And Functions! Trivia Quiz

1.

The function of premolars are to pierce, tear, and ________.

Explanation
The premolars are responsible for piercing, tearing, and grinding food. They have sharp cusps and a larger surface area compared to the incisors and canines, allowing them to effectively grind and break down food particles during the chewing process.

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2.

The lingual cusp(s) of mandibular second premolars are ________ than the buccal.

A.

Larger
B.

Wider
C.

Smaller
D.

Sharper

Correct Answer
C. Smaller

Explanation
The lingual cusp(s) of mandibular second premolars are smaller than the buccal. This means that the cusps on the inner side of the tooth are smaller in size compared to the cusps on the outer side of the tooth. This size difference is a characteristic feature of mandibular second premolars.

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2

3.

In a 3 cusp type mandibular second premolar, the ML cusp is ______ than the DL cusp.

A.

Shorter & rounder
B.

Sharper & shorter
C.

Wider & shorter
D.

Wider & longer

Correct Answer
D. Wider & longer

Explanation
In a 3 cusp type mandibular second premolar, the ML cusp is wider and longer than the DL cusp. This means that the mesiolingual cusp of the tooth is broader and extends further in comparison to the distolingual cusp.

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4.

3rd most commonly missing teeth.

A.

#13 & #29
B.

#20 & #29
C.

#28 & #12
D.

#12 & #5

Correct Answer
B. #20 & #29

Explanation
The correct answer is #20 & #29. These are the 3rd most commonly missing teeth.

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5.

In maxillary second premolars and mandibular premolars, the lingual cusp is smaller than the buccal cusp.

A.

True
B.

False

Correct Answer
A. True

Explanation
The answer is True. In maxillary second premolars and mandibular premolars, the lingual cusp is smaller than the buccal cusp. This is because the lingual cusp is derived from a single lingual lobe, while the buccal cusp is derived from three labial lobes.
The lingual cusp is also slightly displaced to the mesial surface, meaning that it faces the tongue side of the tooth. The buccal cusp faces the cheek side of the tooth. The highest point of each cusp is called the cusp apex.
The shape and size of the cusps can affect how well they fit with other teeth during chewing and biting. Some people may have more difficulty wearing crowns or bridges on their premolars if they have a large or prominent lingual cusp.

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6.

The big buccal cusps of mandibular premolars can be mistaken for a ______________.

Correct Answer
cingulum

Explanation
The big buccal cusps of mandibular premolars can be mistaken for the cingulum. The cingulum is a prominent convexity on the lingual surface of anterior teeth, while the buccal cusps are located on the buccal surface of premolars. However, due to their size and position, the buccal cusps can sometimes be misidentified as the cingulum, leading to confusion in dental examinations or procedures.

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7.

The mandibular first premolar has the shorter root.

A.

True
B.

False

Correct Answer
A. True

Explanation
The mandibular first premolar typically has a shorter root compared to other premolars. This is due to the fact that the mandibular first premolar is located towards the front of the mouth and experiences less occlusal forces compared to the other premolars. As a result, it does not require as much root support, leading to a shorter root length.

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8.

Maxillary first premolars are __________ (larger/smaller) than maxillary second premolars.

Correct Answer
larger

Explanation
Maxillary first premolars are larger than maxillary second premolars. This is because the first premolars have a larger crown size and a more robust root structure compared to the second premolars. The larger size of the first premolars allows for better chewing and grinding of food, while the smaller size of the second premolars allows for better alignment and spacing within the dental arch.

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2

9.

Mandibular first premolars are ________(larger/smaller) than mandibular second premolars.

Correct Answer
smaller

Explanation
Mandibular first premolars are smaller than mandibular second premolars. This is because as we move posteriorly in the dental arch, the teeth generally become larger in size. Therefore, the second premolars, which are located closer to the back of the mouth, are larger than the first premolars.

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10.

The shape of the buccal view of premolars is called __________.

Correct Answer
pentagons
pentagon

Explanation
The shape of the buccal (cheek side) view of premolars is called trapezoidal. The premolars, also known as bicuspids, typically have a somewhat rectangular or trapezoidal shape when viewed from the buccal aspect. This shape is characterized by having two main cusps (hence the term bicuspids) and can vary in morphology depending on the specific premolar and individual variations.

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0

11.

Checkmark all of the general features that associate with premolars:

A.

3 roots
B.

2 roots
C.

1 root
D.

Shorter crown than anteriors
E.

Vertical buccal ridge
F.

Root concavities
G.

Cusp of Carabelli

Correct Answer(s)
B. 2 roots
C. 1 root
D. Shorter crown than anteriors
E. Vertical buccal ridge
F. Root concavities

Explanation
Maxillary first premolar is the only premolar with 2 roots.

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12.

Maxillary premolars can penetrate sinuses.

A.

True
B.

False

Correct Answer
A. True

Explanation
Maxillary premolars are the teeth located in the upper jaw, and they have roots that can extend into the maxillary sinus, which is a hollow space in the skull. This anatomical feature makes them capable of penetrating the sinuses. Therefore, the statement "Maxillary premolars can penetrate sinuses" is true.

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13.

Mandibular first premolars have a CEJ that's more occlusal on the ______ surface.

A.

Mesial
B.

Distal
C.

Lingual
D.

Buccal

Correct Answer
A. Mesial

Explanation
The CEJ (cementoenamel junction) refers to the point where the enamel of a tooth meets the cementum. In the case of mandibular first premolars, the CEJ is more occlusal (towards the biting surface) on the mesial surface. This means that the CEJ is positioned higher on the mesial side of the tooth compared to the other surfaces (distal, lingual, buccal).

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14.

Mandibular second premolars are also known as bicuspids.

A.

True
B.

False

Correct Answer
B. False

Explanation
They can have 3 cusps, there's not always called bicuspids.

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15.

Maxillary second premolars always have one root.

A.

True
B.

False

Correct Answer
B. False

Explanation
Usually have one root but may have two occasionally.

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1

16.

Maxillary premolars are centered over the root(s).

A.

True
B.

False

Correct Answer
A. True

Explanation
Maxillary premolars are located in the upper jaw and are positioned directly over the root(s) of the tooth/teeth. This means that the premolars are aligned vertically above the roots, providing stability and support to the teeth. Therefore, the statement that maxillary premolars are centered over the root(s) is true.

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17.

In maxillary first premolars, the buccal cusp is ________ higher/level/shorter in comparison to the lingual cusp.

Correct Answer
Higher

Explanation
The correct answer is "higher" because in maxillary first premolars, the buccal cusp is positioned higher in comparison to the lingual cusp. This anatomical feature is characteristic of this particular tooth and can be observed in dental radiographs or during dental examinations.

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18.

Which surface of the maxillary first premolars contains a root concavity & a more rounded crown outline?

A.

Distal
B.

Mesial
C.

Buccal
D.

Lingual

Correct Answer
B. Mesial

Explanation
The mesial surface of the maxillary first premolars contains a root concavity and a more rounded crown outline. This means that the side of the tooth that is closer to the midline of the mouth (mesial) has a concavity in the root and a rounded shape in the crown.

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19.

The shape of the buccal view of premolars is called __________.

Correct Answer
trapezoidal or trapezoid