**Question:** The predominant fibre groups affected in the early lesion of gingivitis are:

A. Mucosal and periodontal fibers
B. Periodontal fibers
C. Mucosal fibers
D. Both mucosal and periodontal fibers

**Correct Answer:** D. Both mucosal and periodontal fibers

**Core Concept:**
Gingivitis is an inflammatory condition of the gingiva (gums), often caused by bacterial plaque buildup. In the early stages of gingivitis, the predominant fibre groups affected are mucosal and periodontal fibers. These fibers are essential for maintaining the integrity of the gingiva and its attachment to the alveolar bone.

**Why the Correct Answer is Right:**
In the early stages of gingivitis, the inflammation primarily affects the supporting structures of the gingiva, including mucosal and periodontal fibers. Mucosal fibers are derived from the mucosal layer of the oral mucosa and are responsible for the attachment of the gingiva to the underlying alveolar bone. Periodontal fibers, on the other hand, originate from the periodontal ligament and connect the gingiva to the alveolar bone. Both types of fibers undergo degeneration due to inflammation, causing the gingiva to become red, swollen, and prone to bleeding.

**Why Each Wrong Option is Incorrect:**
A. The correct answer is D, not A, as both mucosal and periodontal fibers are affected in the early lesion of gingivitis.
B. Periodontal fibers are not the only fibers affected; both mucosal and periodontal fibers are involved.
C. Mucosal fibers alone are not the only affected fibers, as both types of fibers are involved.

**Clinical Pearl:**
Understanding the fibre groups affected in gingivitis is crucial for recognizing early signs of the condition. Early diagnosis and treatment of gingivitis can prevent progression to more severe periodontal diseases like periodontitis. Mucosal and periodontal fibers are essential for maintaining the attachment of the gingiva to the alveolar bone, and their degeneration can be indicative of gingivitis.

**Explanation of each wrong option:**
A. Periodontal fibers are not the only fibers affected; both mucosal and periodontal fibers are involved.
B. Mucosal fibers alone are not the only affected fibers, as both types of fibers are involved.
C. Mucosal fibers alone are not the only affected fibers, as both types of fibers are involved.