**Question:** Successional dental lamina is responsible for:

A. Formation of permanent teeth
B. Formation of primary teeth
C. Formation of both primary and permanent teeth
D. Formation of only secondary dentin

**Core Concept:**
The dental lamina is a temporary outgrowth from the dental epithelium, which is a part of the dental follicle. It plays a significant role in tooth development and eruption. In mammals, there are two types of dental lamina:

1. **Primordial dental lamina:** This is the initial structure responsible for the formation of the dental follicle and subsequently, the primary teeth.
2. **Successional dental lamina:** This is the secondary structure responsible for the formation of the dental follicle and subsequently, the permanent teeth.

**Why the Correct Answer is Right:**
Successional dental lamina is responsible for the formation of permanent teeth, as it is the continuation of the primordial dental lamina. The primordial dental lamina develops into the successional dental lamina, which then forms the dental follicle and eventually gives rise to the permanent teeth.

**Why Each Wrong Option is Incorrect:**

A. Formation of primary teeth: The correct answer is the primordial dental lamina, which is responsible for the development of primary teeth.

B. Formation of secondary dentin: Dentin is formed by the odontoblasts, not the dental lamina.

C. Formation of both primary and permanent teeth: While both primordial and successional dental lamina are involved in tooth development, they have distinct roles - the primordial dental lamina for primary teeth and the successional dental lamina for permanent teeth.

**Clinical Pearl:**
Understanding the distinction between primordial and successional dental lamina helps in understanding the process of tooth development and the formation of different types of teeth (primary and permanent teeth) in humans. This knowledge is crucial for dental professionals to comprehend tooth eruption, tooth agenesis, and other dental anomalies.