• Class III (Underdeveloped Maxilla) → Cleidocranial dysplasia, Craniofacial dysostosis, Achondroplasia, Down syndrome, Osteogenesis imperfecta
• Class II (Underdeveloped Mandible) → Treacher Collins syndrome, Pierre Robin syndrome
• Both Jaw Underdevelopment → Hypopituitarism
• Maxillary Enlargement → Metastatic fibrous dysplasia
• Mandibular Enlargement → Acromegaly
• Bimaxillary Enlargement → Paget’s Disease
• Mandibular Asymmetry → Caffey’s Disease
• Prominent Premaxilla → Thalassemia
• Underdeveloped Premaxilla → Congenital Syphilis

• Most Common Benign Odontogenic Tumor: Odontoma (Ameloblastoma is second).

• Adenoid Cystic Carcinoma vs. Adenomatoid Odontogenic Tumor (AOT):

  • Adenoid Cystic Carcinoma: Salivary gland malignancy.

  • Adenomatoid Odontogenic Tumor (AOT): Benign odontogenic tumor. Do not confuse them.

• Liesegang Rings: Can be seen in CEOT/Pindborg's Tumor (primarily) and AOT (rarely).

• Amyloid-like Deposits: Characteristic feature of CEOT (Calcifying Epithelial Odontogenic Tumor).

• Duct-like Structures: Seen in AOT (Adenomatoid Odontogenic Tumor).

• Granular Cell Ameloblastoma: Granules are lysosomal aggregates.

Leukoplakia

• Type: Clinical term
• Histology: Hyperkeratosis ± Dysplasia

Verrucous Carcinoma

• Type: Variant of SCC
• Features:
  • Intact basement membrane
  • Parakeratin plugging
  • Broad "elephant-foot" rete ridges

Adenosquamous Carcinoma

• Features: Mixed adenocarcinoma + SCC

• Chemotherapy Acute Changes: The two common acute changes are hemorrhage and mucositis.

• Radiosensitivity of Glands: Serous type of glands exhibit more radiosensitivity compared to mucous and mixed glands.

• Lichen Planus:

  • Reticular form: Most common type, characterized by Wickham's striae.

  • Malignant potential: Atrophic and erosive forms are associated with significant malignant transformation risk.

  • Histology: Saw-tooth shaped rete pegs.

• Solar Elastosis: Characterized clinically by "sailor's skin" or "farmer's skin" (due to chronic sun exposure).

• Psoriasis & Hereditary Gingival Fibromatosis: Both show test tube-shaped rete pegs histologically.

• LE Cell Test: LE cells represent rosettes of neutrophils that have phagocytosed other leukocytes (seen in Systemic Lupus Erythematosus).

• Tzanck Cells: Seen in vesiculobullous conditions like Pemphigus, Herpes Simplex, Varicella, Herpes Zoster, and CMV infection.

• Ectodermal Dysplasia: Characterized by truncated, conical teeth and missing teeth (hypodontia).

• Widened Periodontal Ligament Space: Extreme widening seen in Scleroderma and Osteosarcoma.

• Geographic Tongue & Psoriasis: Share a common histological feature: Munro's abscesses (neutrophilic microabscesses).

• Epithelial Plaques (localized thickenings): Found in:

  • Lateral Periodontal Cyst

  • Botryoid Odontogenic Cyst

  • Gingival Cyst of Adults

  • Glandular Odontogenic Cyst