Clinical Assessment and Diagnosis
Building a defensible diagnosis
Clinical assessment in dentistry moves from data to synthesis: history, extraoral and intraoral examination, radiographs, and targeted special tests. Candidates must know which test answers which question. Pulp sensibility testing (cold, EPT) assesses nerve response, not blood supply, so a necrotic pulp may still respond if a partial innervation persists; a recently traumatized tooth may be falsely unresponsive. Percussion and palpation suggest periapical inflammation. Transillumination and bite tests help identify cracks. Probing depths must be paired with attachment loss, bleeding on probing, and mobility to grade periodontal status.
Traps in question stems
Questions often present a single dramatic finding and expect you to over-diagnose. Classic traps: interpreting a radiolucency as periapical pathology when it is the mental foramen or maxillary sinus; calling a swelling an abscess when it is a mucocele or fibrous hyperplasia; mistaking referred pain from myofascial trigger points for odontogenic pain. Another trap is anchoring on the first diagnosis and ignoring a normal variant. Always ask what the most likely diagnosis is given the entire picture, and which single test would most change management.
Rule of thumb
Use the "reversible versus irreversible" rule: if the pain is provoked and resolves promptly after stimulus removal, lean reversible; if pain is spontaneous, lingering, or wakes the patient, lean irreversible or necrotic with symptomatic apical periodontitis. If a question offers a test, ask whether the result would actually change treatment.
Worked example
A patient reports cold sensitivity on the upper right first molar lasting seconds. Cold test reproduces pain that fades in 3 seconds; percussion is negative; no swelling. Diagnosis: reversible pulpitis. Management: remove the irritant, seal or restore, and reassess. Escalating to endodontics here is the classic wrong answer.