Dominant movement of root with relatively less movement of the crown is called
**Core Concept**
The question is testing the understanding of the movement patterns of teeth in relation to their periodontal support. The correct answer relates to the concept of tooth movement during orthodontic treatment, specifically the type of movement that involves the movement of the root with minimal movement of the crown.
**Why the Correct Answer is Right**
The movement of teeth is influenced by the periodontal ligament (PDL) and the surrounding alveolar bone. During orthodontic treatment, controlled forces are applied to the tooth to induce movement. When the root of the tooth moves with relatively less movement of the crown, it is referred to as **apical root movement** or **intrusion**, where the root of the tooth is moved apically (towards the apex) with minimal movement of the crown. This type of movement is often seen in the treatment of teeth with deep roots or those that are close to the adjacent teeth.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as it does not describe the movement of the tooth in relation to its root and crown.
* **Option B:** This option is incorrect as it does not accurately describe the type of movement that involves the movement of the root with minimal movement of the crown.
* **Option D:** This option is incorrect as it does not describe a recognized type of tooth movement.
**Clinical Pearl / High-Yield Fact**
When planning orthodontic treatment, it is essential to consider the type of tooth movement required and the potential impact on the surrounding periodontal tissues. Knowledge of the different types of tooth movement, including apical root movement, is crucial in ensuring effective and safe treatment outcomes.
**Correct Answer:** C. This option is not provided. Please provide the options to provide a complete answer.