Hong Kong Dental Council Licensing Examination

Under the Dental Council of Hong Kong Licensing Examination format, what best describes Part I?

• ATwo written multiple-choice papers covering eight subjects
• BA live-patient clinical examination only
• CA portfolio review of previous dental cases
• DA practical phantom-head test without written papers

Which applicant profile matches the published baseline eligibility criteria for taking the DCHK Licensing Examination?

• AA dental assistant with five years of chairside experience but no dental degree
• BA holder of an acceptable dental degree after at least four years of full-time dental tra…
• CA medical graduate who has completed a one-year oral surgery rotation only
• DA dental hygienist who has completed local continuing professional development

A candidate has just passed Part I and wants to sit the next stage. Which option is allowed under the DCHK candidate guide?

• AApply for Part III only without ever passing Part II
• BApply for Part II only, or for both Part II and Part III in the same diet
• CSkip Part II if the candidate has overseas specialist registration
• DRetake all eight Part I subjects before any Part II application

During a Part II simulated clinical test using a phantom head, which conduct is most consistent with DCHK expectations?

• AWear mandatory PPE and follow universal infection control procedures
• BWear a name badge so examiners can verify identity quickly
• CUse endodontic rotary files brought from home if the task involves root canal therapy
• DIgnore patient positioning because the patient is simulated

A Hong Kong dentist prepares clinic website copy about a whitening service. Which wording best follows DCHK professional communication principles?

• AGuaranteed whitest smile in Hong Kong after one visit
• BCheaper and better whitening than nearby dentists
• CWhitening may lighten tooth shade; suitability, risks, and alternatives are assessed afte…
• DBook today because untreated staining will ruin your appearance

Which tissue is the most highly mineralized structure in a tooth?

• ADentin
• BCementum
• CEnamel
• DPulp

Which cell type is primarily responsible for forming dentin?

• AAmeloblasts
• BOdontoblasts
• CCementoblasts
• DOsteoclasts

What is the main function of the periodontal ligament?

• AIt attaches tooth cementum to alveolar bone and absorbs functional forces
• BIt produces enamel rods after eruption
• CIt lines the oral mucosa as keratinized epithelium
• DIt forms the pulp chamber roof

Which salivary function most directly helps protect against dental caries after sugar intake?

• ABuffering plaque acids and helping remineralization
• BPermanently sealing all pits and fissures
• CReplacing lost enamel with new enamel cells
• DEliminating the need for mechanical plaque control

Why is a current medical history especially important before periodontal surgery in a patient with diabetes?

• ADiabetes may affect healing and infection risk
• BDiabetes makes local anaesthesia impossible in every case
• CDiabetes eliminates the need for plaque control
• DDiabetes is a contraindication to all dental radiographs

A patient arrives for elective extraction with symptoms of severe headache and a very high blood pressure reading. What is the best immediate decision?

• AProceed quickly before anxiety increases the pressure further
• BDefer elective care and arrange urgent medical assessment
• CGive aspirin and start the extraction
• DIgnore the reading if the tooth is mobile

A patient develops rapid facial swelling, wheeze, and hypotension minutes after a drug is given. Which emergency diagnosis is most likely?

• AVasovagal syncope
• BAnaphylaxis
• CLocalized dry socket
• DAcute irreversible pulpitis

Before depositing local anaesthetic for an inferior alveolar nerve block, which step reduces the risk of intravascular injection?

• AAspirate before injection and inject slowly
• BWarm the cartridge until it is hot
• CInject the full cartridge rapidly
• DAvoid topical anaesthetic in every patient

A patient has severe throbbing pain three days after mandibular molar extraction, an empty socket, and bad taste but no spreading swelling. What is the most likely complication?

• AAlveolar osteitis
• BAcute osteomyelitis with sepsis
• CTrigeminal neuralgia
• DPeriapical cyst

Which oral lesion should most strongly prompt urgent referral or biopsy assessment?

• AA traumatic ulcer that fully heals after smoothing a sharp cusp
• BA white patch that rubs off leaving erythema and resolves after antifungal treatment
• CA persistent indurated ulcer on the lateral tongue with no obvious healing
• DA symmetrical linea alba along the occlusal plane

A periapical radiograph shows a well-defined radiolucency at the apex of a non-vital maxillary incisor. Which diagnosis is most consistent with the findings?

• APeriapical inflammatory lesion of endodontic origin
• BHorizontal root fracture of a vital tooth only
• CNormal incisive foramen in every case
• DAcute gingivitis

A 4-year-old presents with an avulsed primary maxillary incisor. What is the best management principle?

• AReplant the primary tooth immediately
• BDo not replant; assess injury, reassure, and protect the permanent successor
• CStore the tooth in milk and splint for four weeks
• DPerform root canal therapy on the avulsed tooth before replantation

Which tooth surface is a classic indication for a resin fissure sealant in a caries-risk child?

• AA sound but deep pit-and-fissure surface on a newly erupted permanent molar
• BA smooth root surface with active root caries
• CA mobile exfoliating primary incisor
• DA fractured cusp requiring full coverage

Which permanent teeth commonly erupt around age 6 and are often called six-year molars?

• APermanent first molars
• BPermanent second molars
• CPermanent canines
• DPermanent third molars

Why is rubber dam isolation strongly preferred during root canal treatment?

• AIt improves isolation, prevents salivary contamination, and helps protect the airway
• BIt replaces the need for canal irrigation
• CIt guarantees that working length is correct
• DIt allows endodontic files to be reused without sterilization

In a deep carious lesion close to the pulp in an asymptomatic vital tooth, what is a key reason for selective caries removal?

• ATo reduce the risk of pulp exposure while sealing the lesion
• BTo deliberately leave unsupported enamel at all margins
• CTo avoid placing any definitive restoration
• DTo create a larger cavity for retention regardless of tooth structure

Spontaneous lingering pain to cold that continues after the stimulus is removed is most suggestive of which pulpal diagnosis?

• AReversible pulpitis
• BIrreversible pulpitis
• CNormal pulp
• DPulp necrosis with no symptoms possible

What is the primary etiologic factor in plaque-induced gingivitis?

• ADental plaque biofilm at the gingival margin
• BExcess fluoride in drinking water
• CA fully erupted third molar in normal occlusion
• DA normal frenum attachment

What does periodontal probing primarily assess?

• APocket depth, bleeding tendency, and attachment-related findings around teeth
• BThe shade of enamel only
• CThe oxygen saturation of the patient
• DThe exact fluoride concentration in saliva

Which statement about community fluoride exposure in Hong Kong is supported by official oral health promotion information?

• AHong Kong domestic water has been fluoridated and is currently stated as 0.5 ppm fluoride
• BHong Kong bans fluoride toothpaste for children
• CFluoride only works after all caries has reached the pulp
• DFluoride is used only for periodontal pocket reduction

In removable partial denture design, what is the main purpose of surveying diagnostic casts?

• ATo identify path of insertion, undercuts, guide planes, and design features
• BTo bleach teeth before impression taking
• CTo replace the need for oral examination
• DTo determine the patient blood pressure

Which factor contributes to complete denture retention?

• AAccurate adaptation of the denture base and an effective peripheral seal
• BLeaving all borders deliberately short of the functional sulcus
• CAvoiding any impression of the denture-bearing tissues
• DUsing only anterior teeth for occlusal contact

Why should a crown margin be smooth, well adapted, and cleansable?

• ATo reduce plaque retention, recurrent caries, and periodontal inflammation
• BTo make cement unnecessary
• CTo hide all overcontouring from the patient
• DTo guarantee that no radiograph is ever needed

Which sharps practice best follows standard dental infection-control principles?

• ADiscard used needles and burs into an approved sharps container without passing them hand…
• BBend needles after use so they fit into ordinary waste
• CReach into a sharps box to compress contents when it looks full
• DLeave used scalpel blades on the bracket table for the next procedure

For valid consent to dental treatment, what should the dentist normally do?

• AExplain diagnosis, options, material risks and benefits, then record the discussion
• BAsk the patient to sign a blank form before examination
• CAvoid discussing risks because this may worry the patient
• DLet a third-party payer decide without involving the patient

A patient reports sharp pain from exposed dentin when cold air is blown on a cervical abrasion lesion. Which mechanism best explains this sensitivity?

• AHydrodynamic fluid movement in open dentinal tubules stimulates pulpal nerve endings
• BEnamel rods conduct action potentials directly to the brain
• CCementum contains taste buds that respond to cold
• DThe periodontal ligament becomes necrotic immediately after air drying

Why can pulpal inflammation produce severe pain even before obvious swelling is visible clinically?

• AThe pulp is confined within rigid dentin, so inflammatory pressure can stimulate nerves
• BThe pulp has no sensory nerves and pain must come from enamel
• CInflammation always drains freely through enamel prisms
• DPulpal blood flow stops permanently whenever caries reaches enamel

Which ecological change most favors progression of dental caries?

• AFrequent fermentable carbohydrate exposure that selects for acidogenic and aciduric biofi…
• BA single annual sugar exposure followed by normal salivary clearance
• CImmediate neutralization of plaque pH after every snack
• DComplete absence of plaque retention sites

Which factor is most likely to impair socket healing after extraction?

• APoorly controlled diabetes and heavy smoking
• BAdequate clot formation and stable soft tissue closure
• CGood plaque control and post-operative instructions
• DAtraumatic extraction with irrigation of debris

A patient with a new restoration reports pain only when biting and release from biting on one cusp. Which first step is most appropriate?

• ACheck occlusion and look for high contacts or cracked tooth signs
• BPrescribe antibiotics without examining the restoration
• CExtract the opposing tooth
• DIgnore the symptom until swelling occurs

Which principle best guides selection of dental radiographs for an asymptomatic recall patient?

• AUse radiographs only when justified by individual risk and diagnostic need
• BTake a full-mouth series at every visit regardless of risk
• CAvoid all radiographs because dental radiation is always unjustified
• DUse radiographs only after irreversible treatment has started

A patient taking warfarin needs a simple extraction. Which management principle is best?

• AAssess current anticoagulation status and bleeding risk before treatment, coordinating wi…
• BStop warfarin for every dental extraction without consultation
• CRefuse all dental treatment permanently
• DGive intramuscular analgesics to reduce socket bleeding

Which history item is most relevant before planning extraction because of medication-related osteonecrosis risk?

• ACurrent or previous antiresorptive or antiangiogenic therapy
• BOccasional use of paracetamol for headache
• CUse of fluoride toothpaste twice daily
• DChildhood history of orthodontic retainers

During treatment, a patient develops central chest pain that is not relieved by rest. What is the best dental-chair response?

• AStop treatment, activate emergency medical help, monitor vital signs, and manage as possi…
• BFinish the restoration quickly to reduce stress
• CPlace the patient supine and leave the room to find the appointment book
• DGive a second local anaesthetic cartridge to numb the pain

A patient receiving chemotherapy has fever, oral ulceration, and suspected odontogenic infection. What is the safest management approach?

• AUrgent medical coordination because neutropenia or sepsis risk may be present
• BRoutine scaling only, with review in one year
• CElective extraction immediately without checking blood status
• DReassure that chemotherapy has no relevance to dental infection

A pregnant patient has acute odontogenic pain from irreversible pulpitis. Which principle is best?

• AProvide necessary urgent dental care with appropriate precautions rather than delaying al…
• BAvoid all local anaesthesia in pregnancy regardless of pain
• CDelay diagnosis because radiographs are never permissible when justified
• DPrescribe antibiotics alone for all pulpal pain

A nervous patient becomes pale, sweaty, bradycardic, and briefly loses consciousness before injection. Which diagnosis and first response fit best?

• AVasovagal syncope; stop treatment, position safely, assess airway and vital signs
• BAnaphylaxis; continue dental treatment while watching
• CEpileptic seizure; restrain the jaw open with fingers
• DHyperglycaemia; immediately give insulin

Which statement best reflects antibiotic stewardship in management of localized odontogenic infection?

• ADefinitive dental treatment such as drainage or removal of the source is central; antibio…
• BAntibiotics alone are always curative for necrotic pulps
• CBroad-spectrum antibiotics should be prescribed after every restoration
• DAntibiotics are a substitute for diagnosis and radiographs

For routine post-extraction pain in a medically suitable adult, which analgesic strategy is generally most appropriate first-line?

• ANon-opioid analgesia such as ibuprofen and/or paracetamol when not contraindicated
• BLong-term opioid therapy as the default for all patients
• CAntibiotics instead of analgesics
• DNo analgesia because pain confirms normal healing

Which finding after local anaesthetic administration should raise concern for systemic toxicity rather than ordinary dental anxiety?

• ACircumoral numbness, metallic taste, tinnitus, agitation, or seizure activity
• BMild soreness at the injection site the next day
• CTemporary numbness of the lower lip after an inferior alveolar block
• DA bitter taste from topical anaesthetic gel only

A patient has suspected anaphylaxis in the dental clinic. Which medication is the critical first-line emergency drug?

• AAdrenaline given according to emergency protocol
• BAn oral antihistamine as the only treatment
• CAspirin chewed slowly
• DA prophylactic antibiotic

Why should the dentist ask about non-selective beta-blocker use before using adrenaline-containing local anaesthetic?

• ANon-selective beta-blockade can increase risk of a hypertensive response to adrenaline
• BIt makes all amide local anaesthetics inactive
• CIt proves the patient is allergic to adrenaline
• DIt eliminates the need to aspirate before injection