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DABOM practice questions

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Question 1Oral Medicine Diagnosis and Assessment

A patient reports sharp, well-localized dental pain that lasts only seconds after drinking cold water and stops immediately when the stimulus is removed. Which pulpal diagnosis does this response best support?

  1. Reversible pulpitis Correct answer.
  2. Symptomatic irreversible pulpitis
  3. Asymptomatic irreversible pulpitis
  4. Pulpal necrosis

Explanation

Brief provoked pain that resolves as soon as the cold stimulus is removed is the classic hallmark of reversible pulpitis, indicating the pulp is still vital and capable of recovery once the irritant is eliminated. Irreversible pulpitis typically produces lingering pain, and necrosis produces no response to thermal testing.

Question 2Oral Medicine Diagnosis and Assessment

Which clinical test is most reliable for distinguishing a necrotic pulp from a vital pulp in a mature tooth?

  1. Palpation of the vestibule
  2. Electric pulp testing Correct answer.
  3. Thermal cold testing
  4. Percussion testing

Explanation

Electric pulp testing directly assesses the presence of viable sensory nerve fibers in the pulp, so a lack of response in a mature tooth strongly suggests necrosis. Thermal testing is also useful but can be ambiguous, while percussion and palpation assess periapical inflammation rather than pulp vitality.

Question 3Oral Medicine Diagnosis and Assessment

A fluctuant swelling that points toward the buccal mucosa and drains spontaneously through a sinus tract is most characteristic of which condition?

  1. Osteomyelitis of the mandible
  2. Acute dentoalveolar abscess with drainage Correct answer.
  3. Cellulitis of the buccal space
  4. Periapical granuloma

Explanation

A localized fluctuant swelling that has established a drainage pathway represents an acute dentoalveolar abscess that is decompressing, which typically relieves pain. Cellulitis is a diffuse, firm, spreading infection without fluctuance, and granulomas and osteomyelitis do not present as a pointing fluctuant swelling.

Question 4Oral Medicine Diagnosis and Assessment

Which term describes the sensation of taste that is perceived without any external stimulus, often reported by patients with epilepsy or psychiatric disorders?

  1. Hypogeusia
  2. Dysgeusia
  3. Phantogeusia Correct answer.
  4. Ageusia

Explanation

Phantogeusia is a phantom taste perception occurring in the absence of any tastant, and it has been associated with temporal lobe epilepsy and some psychiatric conditions. Ageusia is complete loss of taste, hypogeusia is reduced taste, and dysgeusia is a distorted taste.

Question 5Oral Medicine Diagnosis and Assessment

Which cranial nerve carries taste from the posterior one-third of the tongue?

  1. Trigeminal nerve
  2. Hypoglossal nerve
  3. Facial nerve
  4. Glossopharyngeal nerve Correct answer.

Explanation

The glossopharyngeal nerve (CN IX) transmits taste from the posterior third of the tongue via the lingual branch. The facial nerve carries taste from the anterior two-thirds through the chorda tympani, while the trigeminal and hypoglossal nerves are not primarily taste pathways.

Question 6Oral Medicine Diagnosis and Assessment

Which finding on examination most strongly suggests oral candidiasis rather than a traumatic keratosis?

  1. A white plaque on the buccal mucosa at the occlusal line
  2. White plaques that wipe off leaving an erythematous base Correct answer.
  3. A white plaque on the lateral border of the tongue
  4. A white plaque fixed to the mucosa

Explanation

Pseudomembranous candidiasis forms white plaques that can be wiped away, exposing an erythematous or bleeding base, which distinguishes it from keratotic lesions. Traumatic keratosis is adherent and does not rub off, and its location often corresponds to a source of friction.

Question 7Oral Medicine Diagnosis and Assessment

Which of the following is the most common site for oral squamous cell carcinoma?

  1. Lateral border of the tongue Correct answer.
  2. Gingiva of the maxilla
  3. Dorsum of the tongue
  4. Hard palate

Explanation

The lateral border of the tongue is the most frequent intraoral site for squamous cell carcinoma, particularly in relation to tobacco and alcohol exposure. The hard palate, maxillary gingiva, and tongue dorsum are less commonly affected.

Question 8Oral Medicine Diagnosis and Assessment

Which imaging modality is the initial investigation of choice for evaluating a suspected odontogenic cyst in the mandible?

  1. Positron emission tomography
  2. Cone-beam computed tomography
  3. Magnetic resonance imaging
  4. Panoramic radiograph Correct answer.

Explanation

A panoramic radiograph is the standard initial imaging study for suspected odontogenic cysts because it provides a broad overview of the jaws at low cost and low dose. Cone-beam CT, MRI, and PET are reserved for specific indications such as surgical planning or soft tissue assessment.

Question 9Oral Medicine Diagnosis and Assessment

A patient has a history of recurrent aphthous ulcers that heal with scarring and also reports genital ulcers and eye inflammation. Which diagnosis should be considered?

  1. Recurrent aphthous stomatitis
  2. Behçet disease Correct answer.
  3. Herpes simplex infection
  4. Oral lichen planus

Explanation

The triad of recurrent oral ulcers, genital ulcers, and ocular inflammation is characteristic of Behçet disease, a systemic vasculitis. Recurrent aphthous stomatitis alone does not involve genital or ocular findings, and herpes and lichen planus have different clinical patterns.

Question 10Oral Medicine Diagnosis and Assessment

Which feature best distinguishes a periapical cyst from a periapical granuloma on a radiograph?

  1. A diffuse radiolucency with ill-defined margins
  2. A well-defined radiolucency with a corticated border Correct answer.
  3. Internal calcifications within the lesion
  4. Root resorption of the involved tooth

Explanation

A periapical cyst tends to show a well-circumscribed radiolucency with a sclerotic or corticated border, whereas a granuloma often has less distinct margins. Internal calcifications and root resorption are not reliable distinguishing features and can occur in various lesions.

Question 11Oral Medicine Diagnosis and Assessment

A patient reports a burning sensation of the tongue and oral mucosa, a dry mouth, and altered taste, with no visible mucosal lesion. Which diagnosis should be highest on the differential?

  1. Oral candidiasis
  2. Geographic tongue
  3. Oral lichen planus
  4. Burning mouth syndrome Correct answer.

Explanation

Burning mouth syndrome presents with intraoral burning, dry mouth, and taste alteration in the absence of visible mucosal disease or identifiable systemic cause. Candidiasis, geographic tongue, and lichen planus all produce visible clinical changes that would be seen on examination.

Question 12Oral Medicine Diagnosis and Assessment

Which laboratory finding is most consistent with primary Sjögren syndrome in a patient with dry mouth and dry eyes?

  1. Elevated serum calcium
  2. Positive anti-double-stranded DNA antibodies
  3. Positive anti-Ro/SSA and anti-La/SSB antibodies Correct answer.
  4. Elevated serum amylase

Explanation

Primary Sjögren syndrome is characterized by autoantibodies against Ro/SSA and La/SSB, along with focal lymphocytic sialadenitis on biopsy. Anti-double-stranded DNA is associated with systemic lupus erythematosus, while amylase and calcium are not diagnostic markers for Sjögren syndrome.

Question 13Oral Medicine Diagnosis and Assessment

A patient develops a painful, unilateral vesicular rash on the palate and gingiva that stops at the midline. Which diagnosis is most likely?

  1. Primary herpes simplex gingivostomatitis
  2. Recurrent herpes labialis
  3. Herpes zoster Correct answer.
  4. Hand-foot-and-mouth disease

Explanation

Herpes zoster produces a unilateral dermatomal vesicular eruption that respects the midline because it follows a sensory nerve distribution. Primary herpes simplex is usually bilateral and generalized, recurrent herpes labialis affects the lips, and hand-foot-and-mouth disease is widespread.

Question 14Oral Medicine Diagnosis and Assessment

Which clinical sign is most suggestive of a malignant transformation in an oral leukoplakia?

  1. Presence of the lesion for many years without change
  2. Bilateral symmetry of the lesion
  3. A homogeneous thin white plaque
  4. A non-homogeneous, speckled or verrucous surface Correct answer.

Explanation

Non-homogeneous leukoplakia with speckled, erythroplakic, or verrucous areas carries a higher risk of dysplasia and malignant transformation than homogeneous plaques. Homogeneous, stable, and symmetric lesions are less concerning for malignancy.

Question 15Oral Medicine Diagnosis and Assessment

Which test is used to assess salivary gland function by measuring the flow rate of stimulated whole saliva?

  1. Fine-needle aspiration
  2. Sialography
  3. Sialometry Correct answer.
  4. Scintigraphy

Explanation

Sialometry quantifies salivary flow rate, typically after stimulation with citric acid, and is used to confirm salivary hypofunction. Sialography images ductal anatomy, scintigraphy assesses gland uptake and excretion, and fine-needle aspiration provides cytology.

Question 16Oral Medicine Diagnosis and Assessment

A patient with a deep carious lesion reports spontaneous throbbing pain that wakes them at night. Which pulpal diagnosis is most appropriate?

  1. Reversible pulpitis
  2. Symptomatic irreversible pulpitis Correct answer.
  3. Pulpal necrosis
  4. Normal pulp

Explanation

Spontaneous, throbbing pain that awakens the patient at night indicates symptomatic irreversible pulpitis, reflecting significant pulpal inflammation that will not resolve. Reversible pulpitis produces only provoked brief pain, normal pulp is asymptomatic, and necrosis typically produces no pain or only mild discomfort.

Question 17Oral Medicine Diagnosis and Assessment

Which radiographic feature is most characteristic of an ameloblastoma of the mandible?

  1. A sunburst periosteal reaction
  2. A multilocular soap-bubble radiolucency Correct answer.
  3. A unilocular radiolucency with a sclerotic border
  4. A ground-glass radiopacity

Explanation

Ameloblastoma classically appears as a multilocular, soap-bubble radiolucency in the posterior mandible. A unilocular lesion with a sclerotic border suggests a cyst, ground-glass opacity suggests fibrous dysplasia, and a sunburst pattern suggests osteosarcoma.

Question 18Oral Medicine Diagnosis and Assessment

Which condition presents with fiery red, atrophic mucosa on the palate and is strongly associated with denture wear and angular cheilitis?

  1. Lichen planus
  2. Median rhomboid glossitis
  3. Nicotinic stomatitis
  4. Denture stomatitis Correct answer.

Explanation

Denture stomatitis is a chronic candidal inflammation of the denture-bearing palate, appearing as erythema beneath the prosthesis and often accompanied by angular cheilitis. Median rhomboid glossitis affects the tongue dorsum, nicotinic stomatitis shows palatal keratosis with red dots, and lichen planus shows striae.

Question 19Oral Medicine Diagnosis and Assessment

A patient has a unilocular radiolucent lesion at the apex of a nonvital tooth with a positive aspiration of yellow fluid. Which diagnosis is most likely?

  1. Radicular cyst Correct answer.
  2. Osteosarcoma
  3. Periapical granuloma
  4. Periapical abscess

Explanation

A radicular cyst arises from a nonvital tooth and typically yields straw-colored or yellow fluid on aspiration. A granuloma is solid tissue, an abscess yields pus with acute symptoms, and osteosarcoma is a malignant bone lesion with aggressive features.

Question 20Oral Medicine Diagnosis and Assessment

Which of the following is an essential first step in the assessment of a patient presenting with a suspected oral malignancy?

  1. Referring for immediate radiotherapy
  2. Ordering a positron emission tomography scan
  3. Obtaining a comprehensive history and performing a systematic oral examination Correct answer.
  4. Prescribing a course of antibiotics

Explanation

A thorough history and systematic visual and tactile examination of the oral cavity are the foundation of assessing a suspected malignancy, guiding subsequent biopsy and imaging. Advanced imaging, antibiotics, and radiotherapy are not appropriate initial steps without a tissue diagnosis.

Question 21Oral Medicine Diagnosis and Assessment

A patient reports that a white patch on the buccal mucosa has been present for six months and does not rub off. Which diagnosis is most likely?

  1. Pseudomembranous candidiasis
  2. Chemical burn
  3. Geographic tongue
  4. Leukoplakia Correct answer.

Explanation

A persistent white patch that cannot be rubbed off and has no identifiable cause is clinically termed leukoplakia, a potentially malignant disorder requiring biopsy. Candidiasis wipes off, chemical burns are painful and usually acute, and geographic tongue shows migrating erythematous patches.

Question 22Oral Medicine Diagnosis and Assessment

A patient presents with trismus, dysphagia, and a firm, board-like swelling of the floor of the mouth. Which condition is most concerning?

  1. Sialolithiasis
  2. Recurrent aphthous stomatitis
  3. Temporomandibular disorder
  4. Ludwig angina Correct answer.

Explanation

Ludwig angina is a rapidly spreading bilateral cellulitis of the submandibular and sublingual spaces that causes trismus, dysphagia, and a board-like floor of the mouth, and it is a life-threatening emergency. Aphthous ulcers, sialolithiasis, and temporomandibular disorders do not produce this combination of signs.

Question 23Oral Medicine Diagnosis and Assessment

Which histopathologic finding is most consistent with oral lichen planus?

  1. Pseudoepitheliomatous hyperplasia with eosinophils
  2. A band-like lymphocytic infiltrate at the epithelial-connective tissue interface Correct answer.
  3. Numerous multinucleated giant cells
  4. Atypical keratinocytes invading the basement membrane

Explanation

Oral lichen planus shows a dense band-like lymphocytic infiltrate hugging the epithelium, with basal cell degeneration and saw-tooth rete ridges. Eosinophils suggest an allergic or immune-mediated reaction, atypical invasion indicates carcinoma, and giant cells suggest a granulomatous process.

Question 24Oral Medicine Diagnosis and Assessment

A patient with a history of radiotherapy to the head and neck develops exposed necrotic bone in the mandible that persists for more than eight weeks. Which diagnosis is most likely?

  1. Medication-related osteonecrosis of the jaw
  2. Osteomyelitis
  3. Periapical abscess
  4. Osteoradionecrosis Correct answer.

Explanation

Osteoradionecrosis is defined by exposed irradiated bone that fails to heal for more than eight weeks without evidence of recurrence. Medication-related osteonecrosis requires antiresorptive or antiangiogenic therapy, osteomyelitis shows active infection, and a periapical abscess is localized to a tooth.

Question 25Oral Medicine Diagnosis and Assessment

Which of the following best explains why an aspirate from a suspected vascular lesion should be obtained before any biopsy?

  1. Aspiration can identify blood and prevent severe hemorrhage during biopsy Correct answer.
  2. Aspiration eliminates the need for imaging
  3. Aspiration confirms the lesion is malignant
  4. Aspiration provides a definitive histologic diagnosis

Explanation

Aspiration of a vascular lesion typically yields blood, alerting the clinician to the risk of significant hemorrhage and prompting further imaging before any surgical intervention. Aspiration does not provide histology, confirm malignancy, or replace imaging.

Question 26Oral Medicine Diagnosis and Assessment

During an oral medicine assessment, which structure is the primary landmark used to identify the anterior boundary of the tonsillar pillar and the retromolar region when inspecting the posterior oral cavity?

  1. The uvula at the midline of the soft palate
  2. The lingual frenum of the ventral tongue
  3. The anterior tonsillar pillar formed by the palatoglossus muscle Correct answer.
  4. The labial frenum of the upper lip

Explanation

The anterior tonsillar pillar is formed by the palatoglossus muscle and marks the lateral boundary between the oral cavity proper and the oropharynx, making it a key landmark for documenting posterior lesions. The uvula, labial frenum, and lingual frenum lie elsewhere and do not define this boundary.

Question 27Oral Medicine Diagnosis and Assessment

A patient reports a sudden, sharp, electric-shock-like pain confined to one division of the trigeminal nerve, lasting seconds, triggered by touching the face or chewing, with no sensory loss. Which diagnosis best fits this presentation?

  1. Classic trigeminal neuralgia Correct answer.
  2. Persistent idiopathic facial pain
  3. Temporomandibular joint arthralgia
  4. Acute pulpitis of a maxillary molar

Explanation

Trigeminal neuralgia produces brief, lancinating, electric-shock pain in a single trigeminal division, provoked by light touch or function, with a normal neurological examination between attacks. The paroxysmal quality and trigger zones distinguish it from continuous pain disorders and from odontogenic pain.

Question 28Oral Medicine Diagnosis and Assessment

Which clinical measurement is used to record the maximum interincisal opening during the examination of a patient with limited mouth opening?

  1. The distance between the maxillary and mandibular central incisal edges at maximum opening Correct answer.
  2. The distance between the tragus and the oral commissure
  3. The vertical overlap of anterior teeth in centric occlusion
  4. The overjet measured in the maximum intercuspation position

Explanation

Maximum interincisal opening is recorded as the vertical distance between the incisal edges of the maxillary and mandibular central incisors at the widest comfortable opening, typically with a millimeter ruler. This value is the standard metric for documenting trismus and monitoring change.

Question 29Oral Medicine Diagnosis and Assessment

A patient reports a burning mouth with no visible mucosal lesion, normal blood counts, normal serum B12 and ferritin, and no dry mouth. Symptoms worsen through the day and are reduced during sleep. Which diagnosis is most likely?

  1. Recurrent aphthous stomatitis
  2. Oral candidiasis
  3. Geographic tongue
  4. Burning mouth syndrome Correct answer.

Explanation

Burning mouth syndrome is a chronic intraoral burning with a clinically normal mucosa, normal laboratory findings, and a characteristic pattern of worsening through the day and absence during sleep. Excluding local and systemic causes such as candidiasis, anemia, and xerostomia supports the diagnosis.

Question 30Oral Medicine Diagnosis and Assessment

In the assessment of a patient with suspected temporomandibular disorder, which finding on examination is most consistent with disc displacement with reduction?

  1. Crepitus felt on both opening and closing movements
  2. A constant deviation to the affected side with no joint sound
  3. A reproducible click on opening that is eliminated by a protrusive opening movement Correct answer.
  4. A history of sudden malocclusion with anterior open bite

Explanation

Disc displacement with reduction produces a reciprocal click as the condyle reduces the displaced disc, and the click typically disappears when the patient opens with a protrusive movement that alters condylar translation. Crepitus, sudden malocclusion, and constant deviation point to degenerative or non-reducing conditions.

Question 31Oral Medicine Diagnosis and Assessment

Which vital staining technique is used as an adjunct to identify mucosal fields at increased risk of malignant transformation in a patient with a widespread oral white patch?

  1. Congo red staining of the tongue dorsum
  2. Toluidine blue staining Correct answer.
  3. Fluorescein angiography of the buccal mucosa
  4. Schiller iodine staining of the palate

Explanation

Toluidine blue is a basic dye that preferentially stains nucleic acids in dysplastic and malignant epithelium and has been used as an adjunct to guide biopsy in widespread oral mucosal lesions. It does not replace histopathology, and false positives occur with inflammation and ulceration.

Question 32Oral Medicine Diagnosis and Assessment

A patient with a suspected parotid swelling reports that the swelling increases at mealtimes and then subsides. Which diagnosis should be considered first?

  1. Pleomorphic adenoma of the superficial lobe
  2. Parotid gland lymphoma
  3. Bell palsy of the facial nerve
  4. Salivary duct obstruction by a sialolith or stricture Correct answer.

Explanation

Mealtime swelling that resolves after eating is the classic history of duct obstruction, in which stimulated saliva cannot drain and the gland enlarges until flow equilibrates. A fixed mass or facial weakness would instead raise concern for neoplasm.

Question 33Oral Medicine Diagnosis and Assessment

Which finding on panoramic radiography most strongly suggests that a radiolucency in the posterior mandible is a Stafne bone defect rather than a true cyst?

  1. A multilocular radiolucency with cortical expansion
  2. A radiolucency associated with a nonvital tooth and periapical widening
  3. A radiolucency that crosses the midline of the symphysis
  4. A well-defined radiolucency below the mandibular canal with an intact cortical outline Correct answer.

Explanation

Stafne defects are developmental lingual cortical depressions that appear as well-defined radiolucencies below the mandibular canal, usually near the angle, with intact cortices and no expansion. They are asymptomatic and do not require biopsy when imaging is characteristic.

Question 34Oral Medicine Diagnosis and Assessment

Which feature best distinguishes a mucocele of the lower lip from a fibroma of the same site?

  1. A soft, fluctuant, bluish swelling that may rupture and refill Correct answer.
  2. A firm, pale, sessile nodule that does not change in size
  3. A white, corrugated plaque that does not rub off
  4. A painful ulcer with a yellow fibrinous base

Explanation

A mucocele results from retention or extravasation of saliva and presents as a soft, fluctuant, often bluish swelling that may rupture and recur. A fibroma is a firm, pale, fibrous nodule related to chronic irritation and does not fluctuate.

Question 35Oral Medicine Diagnosis and Assessment

A patient with type 2 diabetes and poorly controlled blood glucose presents with recurrent oral candidiasis and delayed healing after extraction. Which assessment concept best explains this pattern?

  1. Impaired neutrophil function and reduced salivary flow associated with hyperglycemia Correct answer.
  2. Enhanced mucosal keratinization caused by insulin resistance
  3. Increased salivary pH that directly kills Candida species
  4. Reduced oral microbial diversity that prevents colonization

Explanation

Hyperglycemia impairs neutrophil chemotaxis and phagocytosis and reduces salivary flow, which promotes Candida colonization and delays wound healing. Recognizing this systemic contribution guides both glycemic control and local antifungal management.

Question 36Oral Medicine Diagnosis and Assessment

Which technique is most appropriate for obtaining a tissue sample from a small, accessible oral mucosal lesion during an oral medicine assessment?

  1. Superficial swab culture of the lesion
  2. Fine needle aspiration of the lesion
  3. Incisional biopsy under local anesthesia with inclusion of adjacent normal tissue Correct answer.
  4. Exfoliative cytology from the lesion surface

Explanation

Incisional biopsy with a margin of adjacent normal tissue is standard for small accessible mucosal lesions, allowing histopathologic assessment of architecture and epithelial changes. Fine needle aspiration is used for deeper or glandular masses, and cytology or culture does not provide architectural diagnosis.

Question 37Oral Medicine Diagnosis and Assessment

Which finding on examination of the tongue is most consistent with median rhomboid glossitis?

  1. A unilateral ulcer on the lateral border of the tongue
  2. A smooth, depapillated tongue with loss of filiform papillae
  3. A rhomboid erythematous patch on the midline dorsum anterior to the foramen cecum Correct answer.
  4. Bilateral white striae on the buccal mucosa

Explanation

Median rhomboid glossitis presents as a well-demarcated erythematous, sometimes lobulated patch on the midline dorsum of the tongue just anterior to the foramen cecum and is associated with Candida. It is usually asymptomatic and does not require biopsy when typical.

Question 38Oral Medicine Diagnosis and Assessment

During assessment of a patient with a suspected oral mucosal malignancy, which feature of the cervical lymph nodes most increases concern for metastatic spread?

  1. A soft, mobile node that is tender to palpation
  2. A node that fluctuates in size with meals
  3. Bilateral small nodes that are freely mobile
  4. A firm, fixed node larger than 1.5 cm in level II Correct answer.

Explanation

Nodes that are firm, fixed to surrounding tissue, and enlarged, particularly in level II, raise concern for metastasis from oral squamous cell carcinoma. Tenderness and mobility more often accompany reactive or inflammatory lymphadenopathy.

Question 39Oral Medicine Diagnosis and Assessment

Which clinical finding is most characteristic of angular cheilitis associated with Candida infection?

  1. A unilateral vesicular rash along the mandibular border
  2. A painless nodule at the midline of the lower lip
  3. Erythema and fissuring at the oral commissures with a positive culture for Candida Correct answer.
  4. Diffuse white plaques on the buccal mucosa only

Explanation

Angular cheilitis presents with erythema, fissuring, and maceration at the commissures, and Candida species are frequently isolated, often together with Staphylococcus aureus. Correction of reduced vertical dimension and antifungal therapy are typical management steps.

Question 40Oral Medicine Diagnosis and Assessment

A patient reports a persistent dry mouth and the clinician notes frothy saliva and a lobulated tongue. Which additional finding would most support a diagnosis of xerostomia of salivary gland origin rather than a subjective complaint?

  1. A stimulated whole salivary flow rate below the accepted threshold Correct answer.
  2. A bitter taste reported after eating citrus fruit
  3. A normal unstimulated flow rate with symptoms only at night
  4. Visible pooling of saliva on the floor of the mouth

Explanation

Objective xerostomia is supported by a reduced stimulated whole salivary flow rate, conventionally below about 0.7 mL/min, together with clinical signs such as frothy saliva and a lobulated tongue. Subjective dryness alone is unreliable and should be confirmed with measurement.

Question 41Orofacial Pain and Temporomandibular Disorders

A patient reports jaw locking in the open position that must be manually reduced. Which structure is most directly implicated in this presentation?

  1. The temporalis tendon inserting on the coronoid process
  2. The articular disc displaced anteriorly and unable to recapture Correct answer.
  3. The posterior attachment tissue undergoing fibrosis
  4. The lateral pterygoid muscle in sustained spasm

Explanation

Open locking occurs when the disc is displaced anteriorly and the condyle has translated past the posterior band, so the disc cannot reduce back onto the condyle. This is a disc displacement without reduction that is intermittent and self-reducing only with manipulation.

Question 42Orofacial Pain and Temporomandibular Disorders

Which clinical finding best distinguishes myofascial pain of the masticatory muscles from arthrogenous temporomandibular joint pain?

  1. Crepitus detected during mandibular excursion
  2. Limited opening corrected by manual manipulation
  3. Pain localized to the preauricular region with joint loading
  4. Pain reproduced by palpation of the muscle and referred to a distant site Correct answer.

Explanation

Myofascial pain is defined by palpation-reproduced pain in a muscle that refers to a characteristic distant region. Arthrogenous pain is felt over the joint itself and is provoked by joint loading rather than muscle palpation.

Question 43Orofacial Pain and Temporomandibular Disorders

A patient awakens with restricted opening and jaw pain that improves through the day. Which diagnosis should be highest on the differential?

  1. Disc displacement without reduction
  2. Sleep-related bruxism Correct answer.
  3. Giant cell arteritis
  4. Trigeminal neuralgia

Explanation

Morning-predominant jaw stiffness and pain that eases during the day are typical of sleep-related bruxism, where nocturnal parafunction loads the muscles and joint. The pattern of improvement with waking activity supports a sleep-related rather than structural cause.

Question 44Orofacial Pain and Temporomandibular Disorders

Which imaging modality is the reference standard for assessing disc position and dynamic condylar translation in temporomandibular joint disorders?

  1. Transcranial radiography
  2. Panoramic radiography
  3. Magnetic resonance imaging Correct answer.
  4. Cone beam computed tomography

Explanation

Magnetic resonance imaging depicts the disc, retrodiscal tissue, and joint effusion, and can be performed in open and closed positions to assess reduction. It is the accepted reference standard for soft tissue evaluation of the joint.

Question 45Orofacial Pain and Temporomandibular Disorders

Which medication class is supported as first-line short-term pharmacotherapy for acute masticatory muscle pain in temporomandibular disorders?

  1. Tricyclic antidepressants at analgesic doses
  2. Opioid analgesics
  3. Systemic corticosteroids
  4. Nonsteroidal anti-inflammatory drugs Correct answer.

Explanation

Nonsteroidal anti-inflammatory drugs are the conventional first-line short-term option for acute musculoskeletal and masticatory pain, combined with self-care. They reduce prostaglandin-mediated inflammation and pain without the dependence risk of opioids.

Question 46Orofacial Pain and Temporomandibular Disorders

A patient's maximum assisted opening is 52 mm, but maximum unassisted opening is 34 mm. What does this discrepancy most suggest?

  1. A behavioral or muscular limitation rather than a physical block Correct answer.
  2. Degenerative joint disease with osteophyte formation
  3. A structural ankylosis of the condyle
  4. True mechanical restriction of the joint

Explanation

When assisted opening substantially exceeds unassisted opening, the limitation is not a fixed mechanical block. This pattern points toward muscular guarding or a behavioral component rather than true intracapsular restriction.

Question 47Orofacial Pain and Temporomandibular Disorders

Which feature is characteristic of temporomandibular joint osteoarthritis on imaging?

  1. Anterior disc displacement with normal osseous contours
  2. Soft tissue calcification within the lateral pterygoid
  3. Erosion of the condylar cortex with subchondral sclerosis and osteophyte formation Correct answer.
  4. Uniform joint space widening with disc hypertrophy

Explanation

Osteoarthritis is a degenerative process marked by cortical erosion, subchondral sclerosis, flattening, and osteophyte formation on the condyle. These osseous changes distinguish it from disc displacement alone.

Question 48Orofacial Pain and Temporomandibular Disorders

Which of the following is the most appropriate initial management for a patient with chronic temporomandibular disorder pain and no red flags?

  1. Conservative self-care, education, and physiotherapy Correct answer.
  2. Open joint surgery
  3. Immediate arthrocentesis of the joint
  4. Irreversible occlusal adjustment

Explanation

Guidelines recommend starting with the least invasive, reversible measures: education, self-care, jaw exercises, and physiotherapy. Escalation to invasive procedures is reserved for patients who fail conservative care.

Question 49Orofacial Pain and Temporomandibular Disorders

Which clinical test is used to assess for intracapsular temporomandibular joint pain by loading the joint?

  1. Measurement of maximum interincisal opening
  2. Palpation of the masseter origin
  3. Passive joint loading with the teeth lightly clenched Correct answer.
  4. Resisted jaw opening against the clinician's hand

Explanation

Joint loading maneuvers, such as clenching on a tongue blade or applying axial pressure, provoke pain of intracapsular origin. The test helps separate articular from muscular sources of pain.

Question 50Orofacial Pain and Temporomandibular Disorders

A patient describes brief, lancinating, electric shock-like pain in the mandible triggered by chewing or light touch, lasting seconds. Which diagnosis fits best?

  1. Burning mouth syndrome
  2. Trigeminal neuralgia Correct answer.
  3. Temporomandibular joint arthritis
  4. Persistent idiopathic facial pain

Explanation

Paroxysmal, electric shock-like pain lasting seconds and provoked by innocuous stimuli is the hallmark of trigeminal neuralgia. The trigeminal distribution and brevity of attacks distinguish it from continuous musculoskeletal pain.