Which of the following condition is usually present in class II div 2 malocclusion :
**Core Concept**
Class II div 2 malocclusion is a type of dental malocclusion characterized by a retroclined upper central incisor, overlapping lower incisors, and a deep overbite. It is often associated with a narrow maxillary arch and a steep mandibular plane angle.
**Why the Correct Answer is Right**
In class II div 2 malocclusion, the retroclined upper central incisor is typically caused by an increased inclination of the maxillary central incisors due to the presence of a narrow maxillary arch. This leads to a deep overbite, where the upper incisors overlap the lower incisors significantly. The steep mandibular plane angle contributes to the anterior open bite, where the lower front teeth do not overlap the upper front teeth.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it is more commonly associated with class II div 1 malocclusion, characterized by a retroclined lower central incisor.
**Option B:** This option is incorrect as it is more commonly associated with class III malocclusion, characterized by a protruded lower jaw.
**Option C:** This option is incorrect as it is more commonly associated with class I malocclusion, characterized by a normal overbite and no significant crowding.
**Clinical Pearl / High-Yield Fact**
A key feature of class II div 2 malocclusion is the retroclined upper central incisor, which can be remembered using the mnemonic "RUCI" (Retroclined Upper Central Incisor).
**Correct Answer: D. Class II div 2 malocclusion is characterized by a retroclined upper central incisor, overlapping lower incisors, and a deep overbite.**