Assessment and Diagnosis

Study guide

Unit 5 is the heaviest science unit and the largest question pool in the app. It runs from general anatomy and physiology, through the structure of the teeth and surrounding tissues, to the detection and diagnosis of disease.

General anatomy and physiology

The unit starts wider than the mouth, because a dental nurse needs enough physiology to recognise when a systemic problem is presenting in the chair.

• The heart has four chambers: two atria above, two ventricles below.
• Blood carries oxygen, nutrients, immune cells and clotting factors — questions often link a blood disorder to a dental implication such as bleeding or infection risk.
• Respiratory conditions matter chairside because they affect positioning, sedation and emergency response.
• The skull, jaws and temporomandibular joint, and the muscles and nerve supply of the head and neck, underpin both anaesthesia and the recognition of pain patterns.

Tooth morphology, notation and structure

The vocabulary layer of the unit. Notation and surface naming appear constantly in other units too, so it is worth over-learning.

• Learn the tooth surfaces and the notation systems used to identify individual teeth.
• Deciduous and permanent dentitions differ in number, morphology and eruption timing.
• Enamel, dentine, cementum and pulp differ in composition, sensitivity and capacity to repair — that difference explains most of what caries does.

Caries, pulpitis and tooth surface loss

The disease process itself, and how it presents. This is where the unit’s harder questions cluster.

• Caries results from acid produced by plaque bacteria metabolising fermentable carbohydrate, demineralising the tooth over time.
• Reversible and irreversible pulpitis are distinguished by how the pain behaves — particularly whether it lingers after the stimulus is removed.
• An abscess is a localised collection of pus with its own signs and its own urgency.
• Tooth surface loss covers attrition, abrasion, erosion and abfraction, each with a different cause and therefore a different prevention.

Assessment, radiography, charting and the BPE

The examination itself: what is recorded, how, and what the codes mean.

• Vitality testing assesses pulp status and has known limitations and false results.
• Radiographic faults trace back to identifiable causes in technique, processing or positioning — questions usually give the fault and ask for the cause.
• Charting records what is present, restored and missing, using consistent notation.
• BPE codes run 0 to 4: 0 is healthy with no bleeding, higher codes indicate more serious disease, code 3 is a pocket up to 5.5 mm, code 4 a pocket deeper than 5.5 mm, and * denotes furcation involvement.

In the exam This unit rewards vocabulary precision above all. Many questions are decided by whether you can separate two similar terms — reversible from irreversible pulpitis, abrasion from erosion, code 3 from code 4.