A fibroma is a benign, slow-growing mass composed of dense fibrous connective tissue that arises within the oral cavity, typically as a reactive response to repeated mechanical irritation or trauma rather than a true neoplasm. It is one of the most commonly diagnosed soft-tissue lesions in dental practice.
Common Causes
Oral fibromas form when chronic low-grade irritation triggers localized overgrowth of fibrous tissue in the oral mucosa. Frequent contributing factors include:
- Habitual cheek biting or lip chewing
- Ill-fitting dentures or removable appliances
- Sharp or fractured tooth surfaces
- Poorly contoured dental restorations or crowns
- Persistent tongue thrusting or parafunctional habits
Clinical Appearance
A fibroma typically presents as a smooth, firm, dome-shaped nodule covered by normal-colored mucosa. It is most often found on the buccal mucosa along the occlusal line, but may also appear on the tongue, lips, or gingiva. The lesion is usually pale pink, painless, and ranges from a few millimeters to over a centimeter in diameter. Unlike inflammatory conditions that involve deeper structures such as the periodontal ligament, a fibroma is confined to the superficial soft tissue and does not affect tooth-supporting bone.
Diagnosis and Treatment
Because several oral lesions can mimic a fibroma — including mucoceles, lipomas, peripheral giant cell granulomas, and occasionally malignant soft-tissue tumors — a definitive diagnosis always requires surgical excision followed by histopathologic examination. Under the microscope, a fibroma shows dense, interlacing bundles of collagen with sparse cellularity, distinguishing it from other growths that share a similar clinical appearance.
Treatment consists of conservative excision extending to the base of the lesion. Equally important is eliminating the source of irritation — adjusting a poorly fitting denture, smoothing a rough tooth edge, or addressing a parafunctional habit — to prevent recurrence. Variants such as the giant cell fibroma or peripheral ossifying fibroma have distinct histologic features and may require closer follow-up after removal.
Early identification during routine dental examinations allows for timely, straightforward excision and virtually eliminates the risk of complications.