**Question:** When patient closes in centric occlusion if lower jaw is placed anteriorly in relation to upper jaw. It is called as

A. Class II malocclusion
B. Class III malocclusion
C. Open bite
D. Deep bite

**Core Concept:** Malocclusion refers to an abnormal relationship between the upper and lower dental arches when the teeth come together in centric occlusion (CO). There are several types of malocclusion based on the position of the lower jaw in relation to the upper jaw.

**Why the Correct Answer is Right:** In the correct answer (B. Class III malocclusion), the lower jaw (mandible) is positioned posteriorly in relation to the upper jaw (maxilla). This results in an overbite, where the lower incisors are positioned beyond the upper incisors when the teeth close in centric occlusion.

**Why Each Wrong Option is Incorrect:**

A. Class II malocclusion (correct answer): In this type, the lower jaw is positioned anteriorly relative to the upper jaw, causing an underbite. The lower incisors are positioned below the upper incisors when the teeth close in centric occlusion.

C. Open bite: This refers to a situation where there is no contact between the incisors when the teeth close in centric occlusion. None of the provided options describe an open bite scenario.

D. Deep bite: A deep bite occurs when the lower incisors are positioned anterior to the upper incisors when the teeth close in centric occlusion. None of the provided options represent a deep bite condition.

**Clinical Pearl:** Understanding the various types of malocclusion is crucial for dental professionals to diagnose, treat, and prevent dental problems effectively. Proper diagnosis and treatment planning can improve a patient's oral health, esthetics, and function.

**Correct Answer:** B. Class III malocclusion