Question

"Patient: Female, 38-years-old.

Chief complaint: ""I was chewing and part of my tooth broke.""
Background/or patient history: Your patient is a regular attender, maintains good oral hygiene, and has a low caries risk. There are no relevant medical factors. She has a large mesio-occlusal (MO) composite restoration in tooth #3. This was placed by a previous dentist at least eight-years ago.
Current Findings: Apart from a sharp edge which is uncomfortable on her cheek, the patient has no symptoms. On examination, you find the mesiobuccal cuspof tooth #3 has fractured off supragingival. The tooth is vital and there is no evidence of caries. The occlusion is class I. After a discussion, you and your patient elect to restore tooth #3 today with a direct composite resin restoration, on the understanding that she will return in the coming months to restore the tooth definitively with a more durable ceramic restoration.

In the fractured tooth, which cusp has two triangular ridges
a. Mesiolingual
b. Distobuccal
c. Mesiobuccal
d. Distolingual"

Answer 1

The fractured tooth has two triangular ridges on the Mesiobuccal cusp.

Step-by-step explanation:

The cusp that has two triangular ridges in the fractured tooth is the Mesiobuccal cusp.

Answer 2

The mesiobuccal cusp has two triangular ridges in the fractured tooth.

Step-by-step explanation:

The cusp that has two triangular ridges in the fractured tooth is the Mesiobuccal cusp. The mesiobuccal cusp is one of the four cusps of the maxillary first molar, which is one of the large posterior teeth in the mouth.