COA Dental Anatomy & Oral Development 3

Question 1

In Angle's classification, Class I occlusion is characterized by which molar relationship?

Accepted Answer

The mesiobuccal cusp of the maxillary first molar occludes in the buccal groove of the mandibular first molar

Answer

The mandibular first molar is positioned distal to its normal position

Answer

The mandibular first molar is positioned mesial to its normal position

Answer

The maxillary and mandibular first molars do not contact each other

Question 2

Angle's Class II malocclusion is also referred to by which descriptive term?

Accepted Answer

Disto-occlusion

Answer

Mesio-occlusion

Answer

Neutro-occlusion

Answer

Crossbite

Question 3

What orthodontic term describes the vertical overlap of the upper anterior teeth over the lower anterior teeth?

Accepted Answer

Overbite

Answer

Overjet

Answer

Crossbite

Answer

Open bite

Question 4

The horizontal distance between the labial surface of the upper incisors and the labial surface of the lower incisors, measured parallel to the occlusal plane, is called:

Accepted Answer

Overjet

Answer

Overbite

Answer

Crossbite

Answer

Open bite

Question 5

Which anatomical plane divides the face and body into equal left and right halves and is used as a reference in orthodontic diagnosis?

Accepted Answer

Midsagittal plane

Answer

Frankfort horizontal plane

Answer

Occlusal plane

Answer

Camper's plane

Question 6

What is the term for a tooth that has erupted in an abnormal position outside the normal line of the dental arch?

Accepted Answer

Ectopic tooth

Answer

Impacted tooth

Answer

Ankylosed tooth

Answer

Retained tooth

Question 7

Which permanent tooth is known as the 'cornerstone of the dental arch' due to its long root and key position at the arch curvature?

Accepted Answer

Maxillary canine

Answer

Maxillary central incisor

Answer

Mandibular first molar

Answer

Mandibular second premolar