ADC Part 1 Oral Medicine & Pathology: High-Yield Topics, Example Questions & Study Tips
Oral Medicine & Pathology carries roughly 12% of the ADC Part 1 written exam - ≈34 of 280 questions. Below: the high-yield topics to master, the classic traps that cost candidates marks, an ADC-style example question, and how to study this subject efficiently.
High-yield topics for Oral Medicine & Pathology
| Topic | What to focus on |
|---|---|
| White lesions | leukoplakia vs lichen planus vs candidosis - wipeability, distribution, dysplasia risk |
| Red & mixed lesions | erythroplakia's high dysplasia rate, when urgent referral is mandatory |
| Oral ulceration | RAS types, single non-healing ulcer >2–3 weeks = biopsy, systemic associations (coeliac, Behçet's) |
| Vesiculobullous diseases | pemphigus vs pemphigoid - Nikolsky sign, target antigens, immunofluorescence patterns |
| Oral cancer | risk factors, high-risk sites (lateral tongue, FOM), staging basics and referral pathways |
| Salivary gland disease | mucocele vs ranula, Sjögren's diagnostic features, sialadenitis |
| Orofacial pain | trigeminal neuralgia vs TMD vs atypical pain discrimination |
Common areas candidates struggle with
- Discriminating between white lesions using one clear tell (wipeability, striae pattern, distribution)
- Knowing when a suspicious lesion demands urgent biopsy vs conservative monitoring - the >2-3 week rule
- Pemphigus vs pemphigoid - target antigens, Nikolsky sign direction, ocular involvement
- Recognising drug-induced oral lesions and their triggers
- Discriminating trigeminal neuralgia from atypical facial pain and TMD in vignettes
Classic exam traps
- Treating a chronic single ulcer with ointments instead of biopsy - any ulcer >2–3 weeks without cause needs biopsy
- Confusing pemphigus (intraepithelial, flaccid, Nikolsky+) with pemphigoid (subepithelial, tense, ocular risk)
- Calling every bilateral white buccal lesion lichen planus without checking for friction/candida
- Missing medication causes - gingival overgrowth drugs, lichenoid reactions, xerostomia culprits
Example ADC-style question
Question
A 58-year-old smoker presents with a solitary, well-defined, velvety red patch on the floor of the mouth measuring 12 mm. It has been present for approximately 6 weeks and cannot be attributed to any obvious cause. What is the most appropriate next step?
- Topical corticosteroid trial for 2 weeks then review
- Advise smoking cessation and review in 3 months
- Prescribe an antifungal in case of chronic erythematous candidosis
- Urgent referral for incisional biopsy
Answer: D
This is erythroplakia - a red patch that cannot be attributed to any other condition. It carries a very high risk of dysplasia or invasive carcinoma (~90% show dysplasia or worse on biopsy). High-risk site (FOM), smoker, persistence >2 weeks - urgent biopsy is mandatory. Empirical treatment delays diagnosis.
This is one worked example. There are hundreds more scenario-based oral medicine & pathology MCQs inside the PassADC question bank - with per-option explanations on the ones that matter most.
Key concepts to revise
- White lesion discriminators (wipeability, striae, distribution)
- Red lesion urgency - erythroplakia carries very high dysplasia risk
- Ulcer biopsy threshold - >2-3 weeks without obvious cause
- Pemphigus vs pemphigoid - target antigens, Nikolsky, immunofluorescence
- Oral cancer high-risk sites (lateral tongue, FOM)
- Vesiculobullous diseases - target antigens and clinical features
- Salivary gland pathology - mucocele vs ranula, Sjögren's criteria
- Orofacial pain differentials - trigeminal neuralgia vs TMD vs atypical
How to study Oral Medicine & Pathology for the ADC Part 1
- Learn lesions as discriminating features, not descriptions - the exam tests 'which one is it?'
- Anchor each disease to its ONE tell: wipeable = candida, Wickham's striae = LP, Nikolsky+ = pemphigus
How to test your readiness in Oral Medicine & Pathology
The exam tests this subject through clinical vignettes, so practise it the same way - scenario-based MCQs with explanations, not isolated fact recall. The fastest way to know whether oral medicine & pathology is a strength or a gap is to take a diagnostic across all 10 subjects and compare your accuracy in this subject against the exam weighting.
Once you know where you stand, target the weak areas above with daily practice, review every wrong answer's explanation the same day, and sit at least two full-length timed mocks before booking the real exam.
Want to see whether oral medicine & pathology is actually one of your weak areas?
6 ADC-style questions across the top subjects. Free, instant, no credit card.
Check my ADC readinessRelated ADC Part 1 resources
Start with the ADC Part 1 preparation hub, plan the next 8 weeks with the study guide, or drill more oral medicine & pathology MCQs in the question bank. Also see the full ADC Part 1 exam format guide and how to pass ADC Part 1.
Frequently asked questions
What is the highest-yield oral medicine topic for ADC Part 1?
White and red lesion discrimination, biopsy thresholds, and vesiculobullous diseases (pemphigus vs pemphigoid). Together these appear on almost every paper.
When does an oral ulcer need biopsy?
Any single non-healing ulcer persisting more than 2-3 weeks without an obvious cause warrants biopsy. Multiple recurrent ulcers with a clear pattern (RAS) rarely need biopsy unless atypical.
How do you distinguish pemphigus from pemphigoid?
Pemphigus: intraepithelial split, flaccid bullae, Nikolsky positive, desmoglein autoantibodies. Pemphigoid: subepithelial split, tense bullae, Nikolsky negative or less pronounced, hemidesmosome/basement membrane autoantibodies. Ocular involvement is a pemphigoid hallmark.
What percentage of ADC Part 1 is oral medicine?
Approximately 12% - about 34 of 280 questions.
Where do you actually stand?
30 questions weighted to the official ADC blueprint. Free, instant, no credit card.
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PassADC is an independent study platform and is not affiliated with, endorsed by, or sponsored by the Australian Dental Council. Exam details change - always confirm current format and fees at adc.org.au.