Extra-oral & Intra-oral Soft Tissue Exam

Extra-oral & Intra-oral Soft Tissue Exam

Systemic Screening Rationale and Workflow

A comprehensive extra-oral and intra-oral soft tissue examination is a critical component of every dental hygiene clinical assessment. The primary objective is to detect early signs of pathological deviations, systemic disease manifestations, and premalignant or malignant lesions. According to clinical oncology data, early detection of oral squamous cell carcinoma (OSCC) increases the 5-year survival rate from approximately 40% to over 85%.

The screening follows a systematic, visual, and tactile inspection using a specific sequence. This ensures no anatomical areas are omitted. The workflow begins with a general assessment of the patient's gait, skin, and head/neck, followed by systemic palpation of the cervical lymph nodes, thyroid gland, and temporomandibular joints. The intra-oral exam follows, systematically assessing the lips, labial and buccal mucosa, alveolar mucosa, gingiva, tongue (dorsal, lateral, and ventral surfaces), floor of the mouth, hard and soft palate, tonsillar pillars, and oropharynx.

---

Terminology of Lesion Description

When a lesion is detected, the dental hygienist must document its characteristics in the patient's electronic health record using standardized dental terminology. Accurate documentation is vital for comparative analysis during follow-up appointments and for referral to oral pathologists. A complete lesion description must include its exact anatomical location, size, color, consistency, borders, and morphological type.

1. Size and Dimensions

The size of a lesion must never be estimated or compared to common objects (e.g., 'pea-sized'). Instead, the clinician uses a calibrated periodontal probe to measure the lesion in three dimensions:

• Length: The longest horizontal diameter (in millimeters).
• Width: The horizontal diameter perpendicular to the length (in millimeters).
• Depth or Height: The vertical dimension of the lesion relative to the surrounding tissue plane (in millimeters).

2. Color

Common descriptors include:

• Erythematous (red): Often indicates thin epithelium, inflammation, or increased vascularity. Red lesions (erythroplakia) carry a significantly higher risk of malignancy (up to 90% dysplasia or carcinoma in situ) than white lesions.
• Leukoplakic (white): Indicates hyperkeratosis, acanthosis, or necrosis. White lesions cannot be scraped off.
• Melanotic (black/brown): Indicates melanin deposition (e.g., oral melanotic macule, amalgam tattoo, or melanoma).
• Purpuric (purple): Associated with vascular lesions, extravasated blood, or hemangiomas.

3. Consistency

Consistency is determined through digital, bidigital, or bimanual palpation:

• Fluctuant: A fluid-filled lesion that yields a wave-like movement when pressed.
• Soft: The tissue yields easily to pressure; typical of lipomas or normal adipose tissue.
• Firm: The tissue is dense and resists indentation; typical of fibromas or fibrous hyperplasia.
• Hard (Indurated): Extremely dense, board-like tissue that feels anchored to underlying structures; a classic clinical sign of invasive malignancy.

4. Borders

• Circumscribed (Well-defined): The margins of the lesion are distinct, sharp, and clearly demarcated from healthy surrounding tissue.
• Poorly Defined (Diffuse): The margins are irregular, blending gradually into normal tissue without a clear boundary. This is often a sign of infiltrative growth.

5. Flat vs. Raised Morphology

Lesions are classified into flat, solid raised, or fluid-filled raised categories:

• Flat Lesions:
  • Macule: A flat, circumscribed area of color change less than 1.0 cm (10 mm) in diameter (e.g., oral melanotic macule).
  • Patch: A flat, non-palpable area of color change greater than 1.0 cm in diameter (e.g., snuff dipper's patch).
• Raised (Solid) Lesions:
  • Papule: A solid, elevated lesion less than 1.0 cm in diameter (e.g., lichen planus papule).
  • Nodule: A solid, elevated lesion extending deeper into the connective tissue, measuring between 1.0 cm and 2.0 cm in diameter (e.g., irritation fibroma).
  • Tumor: A large solid mass greater than 2.0 cm in diameter.
  • Plaque: A broad, flat-topped, slightly elevated lesion (e.g., leukoplakia).
• Raised (Fluid-Filled) Lesions:
  • Vesicle: A circumscribed, fluid-filled elevation containing serum or mucin, less than 1.0 cm in diameter (e.g., herpes simplex vesicle).
  • Bulla: A large fluid-filled blister greater than 1.0 cm in diameter (e.g., pemphigus vulgaris).
  • Pustule: A circumscribed elevation containing purulent exudate (pus) of any size (e.g., parulis/gum boil).

---

Temporomandibular Joint (TMJ) Assessment

The TMJ is evaluated through bilateral palpation of the lateral and posterior aspects of the condyles while the patient performs mandibular movements (opening, closing, protrusion, and lateral excursion). The clinician listens and feels for joint sounds, watches for deviation or deflection, and questions the patient regarding pain or restricted movement.

TMJ Clinical Findings and Pathology:

• Clicking/Popping: A brief, sharp sound heard during condylar translation. It represents disc displacement with reduction, where the articular disc starts anterior to the condyle in a closed state, but snaps back onto the condyle during opening.
• Crepitus: A continuous dry, grating, or scraping sound. This represents bone-on-bone contact due to the wear or perforation of the articular disc and cartilage. It is strongly associated with osteoarthritis.
• Deviation: The mandible shifts to one side during opening but returns to the midline at maximum opening. This suggests a temporary interference in translation.
• Deflection: The mandible shifts to one side during opening and remains deflected at maximum opening (does not return to midline). The deflection occurs toward the restricted side, representing disc displacement without reduction or unilateral joint ankylosis.
• Subluxation: A temporary self-reducing hypermobility where the condyle translates anterior to the articular eminence, locking the jaw open. The patient must manually manipulate the mandible to close it.

---

Lymph Node Assessment

Lymph nodes are examined using bilateral palpation. Healthy lymph nodes are generally non-palpable, small (< 10 mm), soft, mobile, and non-tender. When lymph nodes undergo reactive changes (lymphadenopathy), their palpation characteristics help differentiate infection from malignancy.

Lymphadenopathy Classification:

• Acute Infection: Nodes are enlarged, soft-to-firm, highly mobile, and tender/painful. The tenderness is caused by rapid swelling that stretches the node's capsule.
• Malignancy (Metastasis): Nodes are enlarged, hard (indurated), fixed/matted (anchored to surrounding muscles or bone due to extracapsular spread), unilateral, and completely non-tender (painless).

Primary Head and Neck Lymph Node Groups:

1. Submental Nodes: Located inferior to the symphysis of the mandible. They drain the midline of the lower lip, tip of the tongue, floor of the mouth, and mandibular incisors.
2. Submandibular Nodes: Located along the inferior border of the mandible. They drain the cheeks, nose, upper lip, anterior two-thirds of the tongue (excluding the tip), submandibular gland, and all teeth except the mandibular incisors and maxillary third molars.
3. Cervical Chain (Superficial & Deep): Located along the sternocleidomastoid muscle. They drain the posterior tongue, salivary glands, tonsils, larynx, and trachea.
4. Preauricular & Postauricular Nodes: Located anterior and posterior to the ear, draining the scalp, external ear, and skin of the temple.

---

Salivary Glands and Ducts

Salivary glands are evaluated by visual inspection and bimanual palpation. Saliva flow must be assessed by drying the duct orifices and 'milking' the glands to check flow rate and clarity.

Salivary Anatomy:

• Parotid Gland: The largest salivary gland, producing 25% of total daily saliva (purely serous). Located anterior and inferior to the ear. Drained by Stensen's duct, which opens on the buccal mucosa opposite the maxillary second molar.
• Submandibular Gland: Intermediate in size, producing 60-65% of total daily saliva (mixed, predominantly serous). Located in the submandibular triangle. Drained by Wharton's duct, which opens at the sublingual caruncles on either side of the lingual frenum.
• Sublingual Gland: The smallest major gland, producing 10% of total daily saliva (mixed, predominantly mucous). Located in the floor of the mouth. Drained by Bartholin's duct (opens at the sublingual caruncles) and minor ducts of Rivinus (opening along the sublingual fold).