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WorksheetsPrinciples of Investigation and Diagnosis
Total questions: 53
Worksheet time: 29mins
What is the most effective way to begin history taking with a new patient?
Ask about their family history
Start with a detailed medical questionnaire
Begin with an open-ended question
Inquire about their last dental visit
Start by asking their occupation
Which of the following is a characteristic of an open question in history-taking?
Uses technical terminology
Suggests a likely diagnosis
Encourages a yes/no answer
Allows the patient to speak freely
Requires a checklist response
Why should a clinician mix open and closed questions during history-taking?
To minimize patient speaking time
To complete the form faster
To balance rapport-building with gathering specific detail
To avoid appearing uninterested
To control patient behavior
During a consultation, the patient mentions they 'feel dizzy because of their sinuses.' What should the clinician do next?
Accept the explanation and move on
Explain that sinuses don’t cause dizziness
Ask the patient what they mean by “sinuses”
Refer directly to ENT
Start medication for sinusitis
A nervous 50-year-old patient hesitates when asked, 'Do you have a problem with alcohol?' during the first few minutes of the history. What is the most appropriate response?
Repeat the question firmly for clarity
Skip the question entirely
Rephrase the question using medical jargon
Delay asking sensitive questions until rapport is established
Note the reaction and proceed to diagnosis
Why should medical jargon be avoided during history taking?
It confuses the clinician
It’s difficult for patients to pronounce
Patients may not understand it or misuse it
It slows down the history-taking process
It’s not professional to use jargon
Which of the following demographic factors is most commonly associated with autoimmune diseases?
Elderly males
Young males
Middle-aged females
Elderly females
Adolescents of any gender
A 24-year-old patient complains of periodic mouth ulcers. Based on the history alone, which is the most likely provisional diagnosis?
Oral lichen planus
Pemphigus vulgaris
Aphthous stomatitis
Squamous cell carcinoma
Chronic hyperplastic candidosis
A 60-year-old South Asian male presents with reduced mouth opening and a burning sensation. He reports chewing betel nut for over 20 years. On history, there is fibrosis of the buccal mucosa. Which of the following is the most likely diagnosis based on ethnic background and history?
Oral lichen planus
Oral submucous fibrosis
Burning mouth syndrome
Oral candidosis
Sjögren’s syndrome
What is the primary purpose of a medical history questionnaire in dental practice?
To avoid medicolegal problems
To gather complete medical information quickly
To simplify the process of diagnosis
To augment verbal history-taking
To serve as a legally binding document
Why is it essential to verbally confirm responses on a medical history questionnaire?
Patients usually forget their names
It saves time during examination
It replaces the need for clinical examination
Written answers may lack context or be inaccurate
It is only needed in hospital settings
A 45-year-old patient completes a medical history form stating they are fit and well. On questioning, they mention 'occasional nosebleeds' and a past issue with prolonged bleeding after a tooth extraction. What is the most appropriate next step?
Proceed with treatment and monitor for bleeding
Prescribe antibiotics as a precaution
Refer for full blood count only after surgery
Explore personal and family history of bleeding disorders
Dismiss the concern as irrelevant
Which of the following is required for consent to be legally valid in the UK?
Verbal agreement witnessed by staff
A clinician’s recommendation only
The patient’s signature on any form
Sufficient information and patient understanding
Consent by family members in all cases
Why should dental professionals ask about previous dental treatment during history-taking?
To plan cosmetic enhancements
To identify potentially litigious patients
To assess pain tolerance levels
To correlate symptoms with prior treatment or its absence
To reduce the time of examination
A patient refuses a recommended oral biopsy despite your explanation. What is the most appropriate next step?
Proceed with the biopsy using minimal anaesthesia
Document the refusal in writing and respect their decision
Refer the patient for psychological counselling
Explain that refusal voids any future treatment options
Ignore their refusal if the condition is serious
A 35-year-old patient consents to a minor oral surgery but later claims they didn’t understand the potential complications. You had explained the risks verbally and documented 'verbal consent' in their notes. What could have improved the consent process in this case?
Performing the procedure more quickly
Providing medication first
Having the patient sign a written consent form
Asking the patient to consult with family
Omitting rare risks from the explanation
Which of the following must always be palpated during extraoral examination?
Lacrimal glands
Frontal sinus
Submandibular lymph nodes
Zygomatic arch
Mental foramen
You suspect a maxillary sinus infection during a dental exam. What should you do next?
Order blood tests
Percuss the incisors
Palpate the mental foramen
Apply pressure to the maxilla to elicit tenderness
Probe the periodontal pockets
A 52-year-old male presents with dull jaw pain and an ill-defined swelling in the submandibular region. Intraoral examination is unremarkable. Vitality tests on nearby teeth are inconclusive. What is the next best step in clinical reasoning?
Assume it’s muscular pain and treat symptomatically
Ignore it since intraoral findings are normal
Initiate antibiotics without diagnosis
Create a differential diagnosis including malignancy and plan investigations
Schedule elective extraction of adjacent teeth
What does the sensitivity of a diagnostic test refer to?
The likelihood of excluding a disease
The ability to correctly identify patients with a condition
The accuracy of cost-effectiveness
The number of false positives produced
The ability to detect rare diseases only
Why should diagnostic tests not be ordered indiscriminately?
It saves time on paperwork
Too many tests increase specificity
Over-testing may increase false positives and obscure the diagnosis
Patients dislike multiple tests
It limits the patient’s legal recourse
A diagnostic test yields many false positives in a population with rare disease prevalence. What does this imply about the test's use in this context?
The test should be repeated multiple times
The test is ideal for widespread screening
The test’s positive predictive value is low
The test’s sensitivity is too high
The disease does not exist in the population
dentist considers ordering a panel of tests for a patient with vague oral
symptoms. The differential diagnosis includes Sjögren’s syndrome, but the tests
are costly and some are difficult to interpret. What is the most appropriate
action?
Order all available tests to avoid missing anything
Begin treatment based solely on clinical suspicion
Select investigations targeted at confirming/excluding key differential diagnoses
Refer the patient without any testing
Use only cheap, screening-type tests
Which imaging modality is particularly good for evaluating soft tissue lesions without using ionizing radiation?
Cone beam CT
Panoramic radiography
Magnetic resonance imaging (MRI)
CT with contrast
Ultrasound
Why is cone beam CT commonly used in oral surgery and implantology?
It is better for imaging soft tissue
It has the lowest cost of all modalities
It gives high-resolution images of bone at lower doses than medical CT
It eliminates the need for radiologist interpretation
It can image saliva flow dynamically
A 60-year-old patient with a history of oral cancer surgery presents with a new swelling in the neck. CT and MRI are inconclusive due to surgical artefact and inflammation. Which imaging modality would be most helpful in evaluating possible tumour recurrence or metastasis in this case?
Conventional radiograph
Cone beam CT
Ultrasound
PET scan
CT with contrast
What is the most preferred biopsy technique for intraoral lesions requiring histological diagnosis?
Biopsy punch
Core (Trucut) biopsy
Electrocautery
Scalpel biopsy
Laser excision
Why should ulcers generally be avoided when selecting a site for mucosal biopsy?
They contain blood vessels
They are too painful
They lack diagnostic epithelium and are inflamed
They heal too quickly
They bleed excessively
A dentist plans to biopsy a suspicious lesion near the parotid gland. The clinical impression is a pleomorphic adenoma. What is the most appropriate action?
Perform an excisional biopsy using electrocautery
Refer the patient for a laser excision
Perform a punch biopsy of the mass
Use fine needle aspiration or excise the lesion with a margin
Avoid biopsy due to the risk of bleeding
Which routine histological stain combination is most commonly used in microscopy?
Periodic acid–Schiff and Alcian blue
Giemsa and crystal violet
Gram stain and methylene blue
Haematoxylin and eosin
Congo red and PAS
Why are frozen sections not commonly used for initial diagnosis?
They are too expensive for most cases
They destroy tissue for future analysis
They are less accurate than standard histopathology
They require decalcification before analysis
They are only useful for dental enamel
A dentist plans to biopsy a lesion and suspects an immunobullous disease. Which action ensures a valid immunofluorescence test?
Fix the tissue in 10% formal saline
Delay transport to allow air drying
Send tissue fresh or in a special transport medium
Decalcify the tissue before submission
Use electrocautery to prevent bleeding
A dentist biopsies a firm mucosal lesion. The sample is immediately placed in saline and sent to the lab. Two days later, the pathologist reports that the tissue is unsuitable for diagnosis. What is the most likely reason?
The sample lacked enough connective tissue
The specimen was sent too quickly
The tissue was not properly fixed in formalin
The site was inappropriate for biopsy
The patient was taking anticoagulants
What is the main advantage of PCR over traditional culture methods in detecting pathogens?
It requires no sample preparation
It improves antibody binding
It provides structural tissue context
It is rapid and highly sensitive
It replaces the need for biopsy
What is the key benefit of in situ hybridisation (ISH) over PCR?
Greater sensitivity in detecting gene mutations
Cheaper and faster turnaround time
Ability to locate the genetic material within specific tissues and cells
Higher throughput for population screening
Better identification of rare bloodborne pathogens
A qPCR result shows low amplification at a late cycle threshold. What does this most likely indicate?
The gene is absent
There are no controls present
The target is highly expressed
The target is present in low quantity
The probe has failed completely
Which of the following blood tests is most sensitive for detecting iron deficiency?
Serum calcium
Red cell folate
Serum ferritin
Serum phosphate
Erythrocyte sedimentation rate
A smear from a mucosal ulcer reveals virally altered epithelial cells with nuclear changes. What is the most likely diagnosis?
Bacterial stomatitis
Syphilitic chancre
Herpetic infection
Aphthous ulcer
Traumatic ulcer
A patient presents with persistent oral ulceration and sore tongue. You suspect an underlying systemic cause. Blood film shows macrocytic red cells, and the patient reports a vegan diet. Which blood test would most likely confirm the diagnosis?
Serum calcium
Vitamin B12 level
HIV antibody test
Paul–Bunnell test
ESR
(EMQ) to encourage the pt to speak freely about their symptoms
open eneded
close ended
leading question
follow up
probing question
To confirm specific clinical details of the patient’s symptoms(EMQ)
Open-ended question
Closed-ended question
Leading question
Follow-up question
To guide the patient toward a particular answer or assumption
Open-ended question
Closed-ended question
Leading question
Follow-up question
To seek clarification on a vague or unclear previous answer
Closed-ended question
Leading question
Follow-up question
Probing question
Rhetorical question
(EMQ) To explore further information about a sensitive or socially relevant issue (e.g., alcohol use)
Closed-ended question
. Leading question
Follow-up question
Probing question
Results in the patient feeling rushed or undervalued
Interrupting the patient frequently
Using medical jargon
Asking leading question
Making assumptions about the patient’s condition
. May confuse the patient and impair understanding of the questions
Interrupting the patient frequently
Using medical jargon
Asking leading questions
Making assumptions about the patient’s condition
Failing to build rapport
Can lead to the patient giving incomplete or inaccurate responses
Interrupting the patient frequently
Using medical jargon
Asking leading questions
Making assumptions about the patient’s condition
Failing to build rapport
4. May cause the patient to agree with incorrect suggestions
A. Interrupting the patient frequently
B. Using medical jargon
C. Asking leading questions
D. Making assumptions about the patient’s condition
E. Failing to build rapport
What essential communication skill, alongside questioning, helps build rapport during history-taking?
(a)
What type of question should be avoided because it may guide the patient toward a particular answer? •
(a)
What structured tool helps ensure no important medical detail is overlooked in historytaking? •
(a)
What should be avoided during consultations to prevent patient confusion, even in experienced patients?
(a)
What interpersonal factor is critical for encouraging nervous patients to share accurate information?
(a)
