Applied biomedical and dental sciences
Basic science with a clinical consequence
ORE Part 1 rewards candidates who can travel from a basic-science fact to a clinical decision. In anatomy, know the trigeminal branches and the practical consequences of nerve injury: the lingual nerve lies lingual and inferior to the third molar socket and carries taste from the anterior two-thirds of the tongue via chorda tympani. In physiology, understand capillary Starling forces, calcium homeostasis (PTH, vitamin D, calcitonin) and pain transmission, because these underpin local anaesthesia, bleeding risk and bone healing.
In microbiology and immunology, separate the plaque organisms of caries (mutans streptococci, lactobacilli) from those of periodontitis (Porphyromonas gingivalis, Aggregatibacter actinomycetemcomitans), and know the four hypersensitivity types - this explains reactions to latex, local anaesthetics and metals. Pathology stems turn on definitions: hyperplasia versus hypertrophy versus metaplasia versus dysplasia, and grade versus stage.
Pharmacology traps are frequent. Local anaesthetics are weak bases acting in the unionised form, so inflamed acidic tissue resists anaesthesia - the reason a 'hot' tooth is hard to numb. Vasoconstrictors prolong block and reduce bleeding but are relatively contraindicated with non-selective beta-blockers and in unstable cardiac disease.
Worked example: a patient needs 5 ml of 2% lidocaine with 1:80,000 adrenaline. 2% means 20 mg/ml, so 5 ml gives 100 mg lidocaine; 1:80,000 means 0.0125 mg/ml, so 5 ml gives 0.0625 mg adrenaline. Against a maximum of 7 mg/kg (capped at 500 mg) for a 70 kg adult - 490 mg - 100 mg is comfortably safe.
Traps: percentage-to-mg/ml conversion, single-sign descriptions of cranial nerve lesions, and absolute wording ('always', 'never') in pharmacology options.