A patient complains of a posterior tooth that's sensitive to brushing and also to cold. The doctor finds that the gingiva has receded, exposing the _______ and causing the condition.

A. cementum
B. periodontal ligament
C. enamel
D. pulp

(d)

On the Maxillary right side there's one posterior tooth. This tooth has two cusps that are the same size, a wider occlusal table, and a single root. This tooth is a maxillary
A. canine.
B. first premolar.
C. first molar.
D. second premolar.

(c)

One function of the periodontal ligament is to
A. fight lateral forces of the tooth.
B. support the cortical plate.
C. fight systemic infections.
D. hold the tooth firmly in the socket.

(a)

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Your answers are correct!

To determine the correct answer for the first question, we need to understand the symptoms and the dental anatomy. The patient complains of sensitivity when brushing and to cold, which suggests exposure of the sensitive inner layers of the tooth. The doctor finds that the gingiva has receded, exposing the tooth structure. Among the options, only the cementum is a part of the tooth structure that covers the root surface. Therefore, the correct answer is (A) cementum.

For the second question, we need to identify the tooth based on the given characteristics. The tooth on the maxillary right side has two cusps of the same size, a wider occlusal table, and a single root. By considering these characteristics, we can determine that the tooth is a maxillary first molar. Therefore, the correct answer is (C) first molar.

Lastly, for the third question, we need to know the function of the periodontal ligament. The periodontal ligament is a connective tissue that surrounds and attaches the tooth root to the surrounding bone. One of its functions is to fight lateral forces exerted on the tooth during chewing and prevent excessive movement. Therefore, the correct answer is (A) fight lateral forces of the tooth.

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