Top 500 Must-Know Facts for NEET MDS Aspirants [PART 2]

Part 2: High-Yield Advanced Facts (101–200)

These are frequently tested, conceptual, and less obvious facts that often appear in NEET MDS, AIIMS, INI-CET, and state PG entrance examinations.

TOP 500 MUST-KNOW FACTS Part 2 (101–200)

Oral Pathology & Medicine (101–130)

Potentially Malignant Disorders

  1. Speckled leukoplakia has the highest malignant transformation rate among leukoplakias.
  2. Erythroplakia shows dysplasia or carcinoma in over 90% of cases.
  3. Reverse smoking is strongly associated with palatal carcinoma.
  4. Oral submucous fibrosis is linked primarily to areca nut chewing.
  5. Initial change in OSMF occurs in juxta-epithelial connective tissue.
  6. Lycopene is an antioxidant used in OSMF management.
  7. Verrucous carcinoma rarely metastasizes.
  8. Proliferative verrucous leukoplakia has very high malignant potential.
  9. Actinic cheilitis commonly affects lower lip.
  10. Tobacco and alcohol act synergistically in oral carcinogenesis.

Immunopathology

  1. Pemphigus vulgaris exhibits suprabasal clefting.
  2. Tzanck cells are characteristic of pemphigus vulgaris.
  3. Bullous pemphigoid shows subepithelial separation.
  4. Desmoglein antibodies are found in pemphigus vulgaris.
  5. Civatte bodies are seen in lichen planus.
  6. Wickham striae are characteristic of lichen planus.
  7. Direct immunofluorescence is diagnostic in vesiculobullous diseases.
  8. Lupus erythematosus may show oral ulcerations.
  9. Discoid lupus rarely progresses to systemic lupus.
  10. Nikolsky sign is positive in pemphigus but usually negative in pemphigoid.

Syndromes

  1. Gorlin syndrome is associated with PTCH gene mutation.
  2. Gardner syndrome is associated with APC gene mutation.
  3. Peutz-Jeghers syndrome is associated with STK11 mutation.
  4. Cowden syndrome is associated with PTEN mutation.
  5. Multiple mucosal neuromas suggest MEN Type IIb.
  6. Neurofibromatosis Type I is associated with café-au-lait spots.
  7. Treacher Collins syndrome results from first arch defect.
  8. Crouzon syndrome involves premature cranial suture fusion.
  9. Cleidocranial dysplasia shows multiple impacted teeth.
  10. Down syndrome is associated with increased periodontal disease.

Endodontics (131–160)

  1. Most common cause of endodontic failure is missed canals.
  2. MB2 canal is most commonly missed in maxillary first molars.
  3. Sodium hypochlorite dissolves organic tissue.
  4. EDTA removes smear layer.
  5. Chlorhexidine lacks tissue dissolving ability.
  6. Ledermix contains corticosteroid and antibiotic.
  7. Calcium hydroxide has a pH around 12.5.
  8. Enterococcus faecalis is commonly associated with failed RCTs.
  9. Apex locator accuracy decreases in perforation cases.
  10. Apical constriction is the ideal endpoint for obturation.
  11. Working length should be approximately 0.5–1 mm short of radiographic apex.
  12. Lateral condensation is the most widely taught obturation technique.
  13. Warm vertical compaction provides denser obturation.
  14. Vertical root fractures are common in endodontically treated teeth.
  15. Sodium hypochlorite accident causes severe tissue necrosis.
  16. Internal resorption requires immediate treatment.
  17. External cervical resorption is often asymptomatic.
  18. MTA is considered gold standard for perforation repair.
  19. Biodentine is a bioactive dentin substitute.
  20. Pulpal pain is usually difficult for patients to localize.
  21. A-delta fibers mediate sharp pain.
  22. C fibers mediate dull throbbing pain.
  23. Irreversible pulpitis often produces lingering pain.
  24. Reversible pulpitis responds briefly to cold.
  25. Electric pulp testing evaluates nerve vitality, not blood supply.
  26. Laser Doppler flowmetry evaluates pulp vascularity.
  27. Pulp necrosis gives no response to vitality tests.
  28. Crown-down technique reduces debris extrusion.
  29. Rotary NiTi instruments are more flexible than stainless steel files.
  30. Cyclic fatigue is a major cause of rotary instrument separation.

Oral Surgery (161–180)

  1. Most common impacted tooth = Mandibular third molar.
  2. Most common type of impaction = Mesioangular.
  3. Pell and Gregory classification relates to mandibular third molars.
  4. Winter's classification is based on angulation.
  5. Lingual nerve lies close to mandibular third molar region.
  6. Inferior alveolar nerve injury may occur during third molar surgery.
  7. Dry socket usually occurs 2–4 days after extraction.
  8. Dry socket is not a true infection.
  9. Smoking increases risk of dry socket.
  10. Trismus commonly results from medial pterygoid trauma.
  11. Ludwig's angina involves bilateral fascial spaces.
  12. Airway obstruction is the greatest risk in Ludwig's angina.
  13. Cavernous sinus thrombosis can result from facial infections.
  14. Danger area of face extends from corners of mouth to bridge of nose.
  15. Oroantral communication most commonly occurs after maxillary first molar extraction.
  16. Valsalva test helps detect oroantral communication.
  17. Condylar fractures are the most common mandibular fractures.
  18. Parasymphysis fractures are the second most common.
  19. Le Fort I fracture is a horizontal maxillary fracture.
  20. Le Fort III is craniofacial dysjunction.

Periodontology (181–200)

  1. Red complex bacteria include P. gingivalis, T. denticola, and T. forsythia.
  2. Aggregatibacter actinomycetemcomitans is associated with aggressive periodontitis.
  3. Junctional epithelium migrates apically during periodontitis.
  4. Clinical attachment loss is the gold standard measure of periodontal destruction.
  5. Pocket depth alone does not indicate attachment loss.
  6. Horizontal bone loss is more common than vertical bone loss.
  7. Furcation involvement is common in molars.
  8. Glickman classified furcation defects into four grades.
  9. Naber's probe is used for furcation assessment.
  10. Biological width is approximately 2 mm.
  11. Violation of biological width causes chronic inflammation.
  12. Periodontal ligament width is approximately 0.2 mm.
  13. Trauma from occlusion alone does not initiate periodontitis.
  14. Smoking is the strongest environmental risk factor for periodontitis.
  15. Diabetes mellitus is a major modifying risk factor.
  16. Scaling and root planing is the gold standard non-surgical therapy.
  17. Guided tissue regeneration uses barrier membranes.
  18. Enamel matrix derivative promotes regeneration.
  19. Free gingival graft increases attached gingiva.
  20. Connective tissue graft is considered the gold standard for root coverage.

Ultra High-Yield Memory Gems

⭐ MB2 canal → Most commonly missed canal.

⭐ E. faecalis → Most common organism in failed RCT.

⭐ MTA → Gold standard for perforation repair.

⭐ Erythroplakia → Highest malignant potential.

⭐ Condyle → Most common mandibular fracture site.

⭐ A. actinomycetemcomitans → Aggressive periodontitis.

⭐ Clinical attachment loss → Best indicator of periodontal destruction.

⭐ Oroantral communication → Maxillary first molar extraction.

⭐ Dry socket → Most common post-extraction complication.

⭐ Gorlin syndrome → Multiple OKCs + PTCH mutation.

These facts are the kind that repeatedly appear in NEET MDS one-liners, image-based questions, and assertion-reason questions. 

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