Concours de Résidanat en Médecine Dentaire (Morocco)

Which cranial nerve provides general sensory innervation to the anterior two-thirds of the tongue, the floor of the mouth, and the mandibular lingual gingiva?

• ALingual nerve (nerf lingual, branch of the mandibular division of the trigeminal nerve, V…
• BGlossopharyngeal nerve (cranial nerve IX)
• CHypoglossal nerve (cranial nerve XII)
• DChorda tympani acting independently without the trigeminal nerve

During an inferior alveolar nerve block (épine de Spix / Spix injection), the local anesthetic solution is deposited into the pterygomandibular space. What anatomical landmark on the medial surface of the mandibular ramus guards the mandibular foramen and serves as the attachment site for the sphenomandibular ligament?

• AThe lingula (épine de Spix)
• BThe mylohyoid line (ligne mylo-hyoïdienne)
• CThe genial tubercles (épines mentonnières)
• DThe coronoid process (apophyse coronoïde)

What anatomical boundaries delineate the pterygomandibular space (espace ptérygo-mandibulaire), in which the inferior alveolar nerve, lingual nerve, and inferior alveolar blood vessels course?

• AMedially by the medial pterygoid muscle, laterally by the medial surface of the mandibula…
• BMedially by the buccinator muscle, laterally by the masseter muscle, and posteriorly by t…
• CMedially by the mylohyoid muscle, laterally by the platysma, and inferiorly by the hyoid…
• DMedially by the tongue, laterally by the alveolar process, and superiorly by the palate

Which muscle of mastication contributes most directly to protrusion and forward translation of the mandibular condyle and assists active depression of the mandible at the temporomandibular joint?

• ALateral pterygoid muscle (muscle ptérygoïdien latéral / externe)
• BMedial pterygoid muscle (muscle ptérygoïdien médial / interne)
• CMasseter muscle
• DTemporalis muscle (muscle temporal)

The articular disc of the temporomandibular joint (TMJ / ATM) is a biconcave fibrocartilaginous structure divided into three distinct anatomical zones. Which zone is completely avascular and aneural, and receives physiological compressive load during mastication?

• AThe intermediate zone (zone intermédiaire)
• BThe anterior band
• CThe posterior band
• DThe bilaminar retrodiscal pad (zone rétrodiscale)

Through which skull base foramen does the maxillary nerve (cranial nerve V2) exit the middle cranial fossa, and what anatomical space does it immediately enter?

• AExits through the foramen rotundum (foramen rond) to enter the pterygopalatine fossa (fos…
• BExits through the foramen ovale to enter the infratemporal fossa
• CExits through the superior orbital fissure to enter the orbit
• DExits through the stylomastoid foramen to enter the parotid gland

Which major terminal branch of the external carotid artery originates posterior to the neck of the mandible within the parotid gland, passes horizontally through the infratemporal fossa, and enters the pterygopalatine fossa to supply the upper and lower teeth, jaws, and muscles of mastication?

• AMaxillary artery (artère maxillaire interne)
• BSuperficial temporal artery (artère temporale superficielle)
• CFacial artery (artère faciale)
• DLingual artery (artère linguale)

A severe odontogenic infection originating from the root apices of a mandibular second or third molar perforates the lingual cortical plate below the attachment of the mylohyoid muscle. Into which deep anatomical fascial space will the purulent collection primarily drain, presenting a risk for Ludwig's angina?

• ASubmandibular space (espace sous-mandibulaire)
• BSublingual space (espace sublingual)
• CBuccal space (espace génien)
• DCanine fossa space

In the surgical anatomy of the palate, which foramen transmits the nasopalatine nerve (nerf naso-palatin de Scarpa) and the terminal branch of the sphenopalatine artery to provide sensation to the palatal mucosa of the six anterior maxillary teeth (canine to canine)?

• AIncisive foramen (foramen incisif / trou palatin antérieur)
• BGreater palatine foramen (foramen grand palatin / trou palatin postérieur)
• CLesser palatine foramen (foramen petit palatin)
• DPalatovaginal canal

Which branch of the facial nerve (cranial nerve VII) provides parasympathetic preganglionic secretomotor innervation to the submandibular and sublingual salivary glands, as well as special taste sensation to the anterior two-thirds of the tongue?

• AChorda tympani (corde du tympan)
• BGreater petrosal nerve (nerf grand pétreux)
• CNerve to stapedius
• DPosterior auricular nerve

In the osteology of the temporomandibular joint, which cranial bone forms the mandibular fossa (glenoid fossa) and the articular eminence (tubercle)?

• ASquamous part of the temporal bone (écaille de l'os temporal)
• BZygomatic bone
• CSphenoid bone greater wing
• DCondylar process of the mandible

What is the primary anatomical route by which septic thrombophlebitis originating from a severe odontogenic infection of the maxillary canine or premolars ('danger triangle of the face') can spread retrograde into the intracranial cavernous sinus (thrombophlébite du sinus caverneux)?

• AVia facial-angular venous connections to the superior ophthalmic vein and cavernous sinus…
• BDirectly through the internal carotid canal
• CVia the thoracic duct into the jugular foramen
• DThrough the cribriform plate of the ethmoid bone

Which sensory nerve branch of the mandibular nerve (V3) passes between the two heads of the lateral pterygoid muscle, crosses the anterior border of the ramus, and emerges superficial to the buccinator muscle to provide sensation to the skin and mucous membrane of the cheek and the vestibular gingiva of the mandibular molars?

• ABuccal nerve (nerf buccal / long buccal nerve)
• BBuccal branch of the facial nerve (rameau buccal du nerf facial)
• CMental nerve (nerf mentonnier)
• DAuriculotemporal nerve

What anatomical structure forms the medial wall of the maxillary sinus (antrum of Highmore / sinus maxillaire) and contains the natural ostium that drains into the middle meatus of the nasal cavity?

• AThe lateral wall of the nasal cavity (concha inferior, uncinate process, and perpendicula…
• BThe orbital floor
• CThe alveolar process of the maxilla
• DThe infratemporal surface of the maxilla

During a surgical sagittal split ramus osteotomy (BSSO) of the mandible in orthognathic surgery, which neurovascular bundle runs through the mandibular canal and is at highest risk of iatrogenic transection or neuropraxia, resulting in neurosensory deficit of the ipsilateral lower lip and chin?

• AInferior alveolar nerve and artery (nerf et artère alvéolaires inférieurs)
• BLingual nerve
• CFacial artery
• DMylohyoid nerve

What is the primary sensory innervation of the pulpal tissues of the maxillary permanent molars?

• APosterior superior alveolar nerves (nerf alvéolaire postéro-supérieur), with the mesiobuc…
• BInferior alveolar nerve
• CNasopalatine nerve
• DGreater palatine nerve exclusively

Which extrinsic ligament of the temporomandibular joint extends from the spine of the sphenoid bone to the lingula of the mandible, acting as a passive suspensory ligament without limiting normal hinge opening movements?

• ASphenomandibular ligament (ligament sphéno-mandibulaire)
• BStylomandibular ligament
• CLateral temporomandibular ligament (ligament latéral)
• DPterygomandibular raphe

Which anatomical structure passes through the incisive canal (canalis incisivus) of the mandible, located anterior to the mental foramen?

• AThe incisive neurovascular bundle (prolongation of the inferior alveolar nerve supplying…
• BThe facial vein
• CThe lingual artery
• DThe chorda tympani

What is the primary motor innervation of the buccinator muscle (muscle buccinateur), and what is its primary physiological role during mastication?

• AInnervated by the buccal branch of the facial nerve (cranial nerve VII); it compresses th…
• BInnervated by the mandibular nerve (V3); it elevates the mandible into maximal intercuspa…
• CInnervated by the hypoglossal nerve (cranial nerve XII); it retracts the base of the tong…
• DInnervated by the glossopharyngeal nerve (cranial nerve IX); it initiates swallowing

Which anatomical structure penetrates the parotid gland, passes horizontally over the superficial surface of the masseter muscle, pierces the buccal fat pad and the buccinator muscle, and opens into the oral cavity opposite the crown of the maxillary second molar?

• AThe parotid duct (Stensen's duct / canal de Sténon)
• BThe submandibular duct (Wharton's duct)
• CThe sublingual duct (Bartholin's duct)
• DThe facial artery

During embryonic odontogenesis, what embryonic germ layers give rise to the enamel organ and the dental papilla, respectively?

• AOral ectoderm gives rise to the enamel organ (forming enamel); ectomesenchyme (cranial ne…
• BMesoderm gives rise to enamel; endoderm gives rise to dentin
• CEndoderm gives rise to the enamel organ; ectoderm gives rise to the dental papilla
• DNeural crest gives rise to enamel; lateral plate mesoderm gives rise to pulp

What is the embryonic function of Hertwig's epithelial root sheath (gaine épithéliale de Hertwig / HERS) during tooth root development, and what cellular remnants remain in the periodontal ligament following its disintegration?

• AIt guides root shape and induces adjacent dental papilla cells to differentiate into radi…
• BIt forms the mature acellular cementum directly
• CIt produces coronal enamel prisms during the bell stage
• DIt synthesizes collagen fibers of the gingival papilla

In the microstructural histology of human dental enamel, what are the Hunter-Schreger bands, and what optical phenomenon produces their characteristic appearance under reflected polarized light microscopy?

• AAlternating light (parazones) and dark (dia zones) bands produced by optical changes in t…
• BIncremental growth lines representing daily circadian rhythms of ameloblastic secretion
• CHypocalcified ribbon-like structures extending from the dentinoenamel junction into the e…
• DHypermineralized cracks on the tooth surface resulting from occlusal trauma (enamel lamel…

What primary cell type forms the outermost cell layer of the dental pulp at the pulpo-dentinal junction, possessing cytoplasmic processes (Tomes' fibers) that extend within the dentinal tubules?

• AOdontoblasts (odontoblastes)
• BAmeloblasts
• CCementocytes
• DFibroblasts of the cell-rich zone of Hohl

According to the hydrodynamic theory of dentin hypersensitivity formulated by Brännström, what physical mechanism triggers acute, sharp pain when exposed dentin is subjected to thermal, osmotic, tactile, or evaporative stimuli?

• ARapid outward or inward fluid movement within open dentinal tubules, which deforms nerve…
• BDirect thermal denaturation of odontoblast cell nuclei
• CInvasion of oral pathogenic bacteria into the pulp core
• DActivation of unmyelinated C-fibers deep within the central pulp core by inflammatory pro…

What histological and biological distinction differentiates reactionary tertiary dentin from reparative tertiary dentin formed in response to deep carious or operative pulpal irritation?

• AReactionary dentin is secreted by surviving original primary odontoblasts in response to…
• BReactionary dentin contains enamel prisms; reparative dentin contains osteoclasts
• CReactionary dentin forms before tooth eruption; reparative dentin forms only in non-vital…
• DReactionary dentin is completely uncalcified; reparative dentin is pure hydroxyapatite wi…

In the periodontal ligament, which principal collagen fiber group is the most numerous, extending from root cementum in a coronal direction to alveolar bone and resisting intrusive axial occlusal loads?

• AOblique fibers (fibres obliques)
• BAlveolar crest fibers (fibres de la crête alvéolaire)
• CHorizontal fibers
• DApical fibers

Which type of root cementum covers the cervical two-thirds of human tooth roots, lacks embedded cementocytes, and contains densely packed extrinsic Sharpey's fibers primarily responsible for anchoring the tooth to the alveolar bone?

• AAcellular extrinsic fiber cementum (AEFC / cément acellulaire à fibres extrinsèques)
• BCellular intrinsic fiber cementum (CIFC)
• CCellular mixed stratified cementum (CMSC)
• DAcellular afibrillar cementum (AAC)

In alveolar bone remodeling and orthodontic tooth movement, what molecular signaling triad regulates osteoclast differentiation and activity in response to mechanical compression and tension in the periodontal ligament?

• ARANK (Receptor Activator of Nuclear Factor-kappa B) on osteoclast precursors, its ligand…
• BFibroblast Growth Factor (FGF), Collagenase-1, and Elastin
• CAmelogenin, Enamelin, and Tuftelin
• DThromboxane A2, Prostacyclin, and Leukotriene B4

What is the primary physiological chemical buffer system in stimulated human whole saliva responsible for neutralizing dietary and plaque acids and maintaining oral pH above the critical demineralization threshold?

• ACarbonic acid-bicarbonate buffer system (H2CO3 / HCO3-)
• BPhosphate buffer system exclusively
• CUrea-ammonia cycle
• DSerum albumin protein buffering

Which statement best summarizes the conventional critical-pH concept for enamel and the effect of fluoride on mineral solubility?

• ACritical pH of enamel hydroxyapatite is approximately 5.5; fluorapatite lowers the critic…
• BCritical pH of hydroxyapatite is 7.0; fluorapatite raises it to 8.5
• CCritical pH of hydroxyapatite is 3.0; fluorapatite has identical solubility at all pH lev…
• DCritical pH of hydroxyapatite is 6.8; fluorapatite dissolves instantly below pH 6.5

Histologically, the dental pulp is organized from its peripheral dentinal margin toward the central pulp core into four distinct concentric zones. What is the correct outward-to-inward sequence of these zones?

• AOdontoblast layer -> Cell-free zone of Weil -> Cell-rich zone of Hohl -> Central pulp core
• BCell-rich zone -> Odontoblast layer -> Central core -> Cell-free zone
• CStratum intermedium -> Stellate reticulum -> Odontoblasts -> Predentin
• DGranular layer of Tomes -> Odontoblasts -> Dentin -> Cementum

During the transition from the cap stage to the bell stage of tooth development, which transient non-dividing epithelial cell cluster serves as the primary organizational signaling center of the tooth germ, orchestrating crown shape and cusp morphogenesis via secretion of morphogens (BMP-2/4, FGF-4, Wnt-10b, and Shh)?

• AThe primary enamel knot (nœud de l'émail primaire)
• BThe dental follicle (sac folliculaire)
• CThe epithelial rests of Serres
• DThe stratum intermedium

What specialized cellular ultrastructure attaches the cells of the junctional epithelium (épithélium jonctionnel) directly to the mineralized tooth surface (enamel or cementum), forming the biological epithelial attachment (attache épithéliale)?

• AHemidesmosomes and an internal basal lamina rich in adhesion proteins such as laminin-332
• BDesmosomes and cadherins adhering to Sharpey's fibers
• CGap junctions and tight zonula occludens junctions
• DDirect covalent cross-links between keratin and hydroxyapatite

During the secretory stage of amelogenesis, what specialized conical cytoplasmic projection at the apical pole of secretory ameloblasts is responsible for directing the orientation of enamel crystallites and organizing enamel into rod (prism) and interrod structures?

• ATomes' process (prolongement de Tomes)
• BOdontoblast process (Tomes' dentinal fiber)
• CCilia of the stratum intermedium
• DBrush border microvilli

In oral mucosal histology, which anatomical regions of the oral cavity are lined by masticatory mucosa (muqueuse masticatoire), characterized by a keratinized or parakeratinized stratified squamous epithelium bound firmly to underlying bone by a dense collagenous lamina propria?

• AThe attached gingiva (gencive attachée) and the hard palate (palais dur)
• BThe floor of the mouth and ventral surface of the tongue
• CThe buccal mucosa and the soft palate
• DThe labial vestibule and alveolar mucosa

In the microscopic histological architecture of major salivary glands, what type of secretory acinar units compose the human parotid gland, and what histological feature clearly distinguishes them from the sublingual gland?

• AThe parotid gland is composed purely of serous acini (containing apical zymogen secretory…
• BThe parotid gland is composed purely of mucous acini; the sublingual is purely serous
• CThe parotid gland contains exclusively lipid-storing sebaceous acini
• DThe parotid gland lacks intralobular striated ducts and intercalated ducts

What is the primary cariostatic biochemical mechanism of topically applied fluoride (e.g., toothpastes, varnishes, fluoridated water) on dental hard tissues?

• AMaintaining low fluoride levels at the tooth-biofilm interface that inhibit demineralizat…
• BStimulating pulpal odontoblasts to double enamel thickness
• CAlkalinizing the oral cavity to pH 9.0 permanently
• DDestroying salivary amylase to eliminate carbohydrate digestion

In periodontal biology, what is the origin of Gingival Crevicular Fluid (GCF / fluide gingival), and how does its composition change during the transition from clinically healthy gingiva to active periodontitis?

• ADerives from the subepithelial gingival microvasculature; flow and inflammatory cellular…
• BOriginates as a secretion from major salivary glands; decreases in volume during inflamma…
• COriginates from necrotic odontoblast autolysis in the pulp
• DIs pure mucin synthesized by junctional epithelial goblet cells

Which statement best describes the current biological understanding of active physiological tooth eruption?

• ACoordinated alveolar bone remodeling (osteoclastogenesis ahead of the erupting crown and…
• BRoot elongation pressing against an unyielding basal bone plate (root growth theory)
• CHigh hydrostatic pressure within the pulpal vasculature exclusively
• DContinuous deposition of coronal enamel pushing the tooth upward

According to the classical Keyes-Newbrun multifactorial etiology of dental caries, what four interrelated primary factors are simultaneously required for the initiation and progression of carious lesions?

• AA susceptible host tooth, cariogenic dental plaque bacteria (e.g., Streptococcus mutans),…
• BSystemic hypertension, vitamin C deficiency, dental trauma, and aging
• COrthodontic brackets, salivary mucins, alkaline water, and genetics
• DImpacted teeth, fluoride toxicity, excessive mastication, and malocclusion

A 28-year-old female presents with severe pain in a mandibular molar. Clinical testing reveals that the tooth exhibits intense, sharp pain upon cold stimulation that lingers for over 45 seconds after the cold stimulus has been removed, accompanied by spontaneous, unprovoked nocturnal throbbing episodes. The tooth is not sensitive to vertical percussion. What is the pulpal diagnosis?

• ASymptomatic irreversible pulpitis (pulpite irréversible symptomatique)
• BReversible pulpitis (pulpite réversible)
• CPulpal necrosis with acute apical abscess
• DNormal vital pulp

In periapical pathology, what histopathological feature differentiates a true radicular cyst (kyste périapical vrai) from a periapical pocket cyst (kyste en poche / bay cyst), and what is its clinical consequence for non-surgical endodontic healing?

• AA true radicular cyst has a completely epithelial-lined lumen separate from the root cana…
• BA true cyst is composed purely of granulation tissue without epithelium; a pocket cyst co…
• CA true cyst is caused by viral infection; a pocket cyst is allergic
• DA true cyst occurs exclusively in primary teeth; pocket cysts occur only in elderly adults

A routine panoramic radiograph of an asymptomatic 19-year-old male reveals a well-defined, unilocular, corticated radiolucency surrounding the crown of an unerupted, impacted mandibular third molar, attached at the cementoenamel junction (CEJ). What is the most likely diagnosis?

• ADentigerous cyst (kyste folliculaire / dentigère)
• BNasopalatine duct cyst
• CTraumatic bone cyst
• DStafne bone defect

A 35-year-old male presents with painless swelling of the posterior left mandibular body and ascending ramus. Radiographs demonstrate a classic multilocular 'soap-bubble' (bulles de savon) radiolucency with cortical expansion and root resorption of adjacent molars. Biopsy shows islands of odontogenic epithelium with peripheral palisaded columnar cells exhibiting reversed nuclear polarity (Vickers-Gorlin criteria) and central stellate reticulum-like cells. What is the diagnosis?

• AAmeloblastoma (améloblastome conventionnel / solide)
• BOdontoma (odontome)
• CPeriapical cemento-osseous dysplasia
• DSquamous cell carcinoma

What characteristic histopathological features define the Odontogenic Keratocyst (OKC / kératokyste odontogène), and which hereditary syndrome featuring multiple OKCs, palmar/plantar pitting, and calcification of the falx cerebri is associated with mutations in the PTCH1 tumor suppressor gene?

• AA thin, uniform parakeratinized stratified squamous epithelium (6 to 8 cells thick), corr…
• BNon-keratinized epithelium with abundant mucous goblet cells; associated with Gardner syn…
• CPseudostratified ciliated columnar respiratory epithelium; associated with Peutz-Jeghers…
• DDense fibrous tissue with multinucleated foreign body giant cells; associated with Albrig…

In oral oncology, which potentially malignant disorder (OPMD) carries the highest statistical risk of harboring severe epithelial dysplasia, carcinoma in situ, or invasive squamous cell carcinoma at the time of initial biopsy?

• AOral erythroplakia (érythroplasie buccale)
• BHomogeneous oral leukoplakia
• CReticular oral lichen planus
• DSmoker's palatal keratosis (nicotine stomatitis)