Oral Biology & Tooth Morph 2007 Flashcards
Disturbance of saliva production from the parotid gland is likely to result from damage to which of the following ganglia?
a) Gasserian
b) Geniculate
c) Otic
d) Pterygopalatine
e) Trigeminal
c) Otic
A 20 year old man falls down and chips the incisal edge of his maxillary central incisor, reducing the length of the crown. A dentist informs him that the tooth may erupt a little to compensate for the
loss. This tooth movement is likely to result in increase in size of which of the following dental tissues?
a) Cementum
b) Dentin
c) Enamel
d) Periodontal ligament
e) Pulp
a) Cementum
A patient complains of loss of taste, and a numb sensation in the left half of his tongue, after removal of his left lower wisdom tooth. Which of the following nerves is most likely to have been injured during removal of this tooth?
a) Facial nerve
b) Glossopharyngeal nerve
c) Inferior alveolar nerve
d) Lingual nerve
e) Mandibular nerve
d) Lingual nerve
At the age of nine years, the mandibular permanent first molar has its distal contact with which of the following teeth?
a) First premolar
b) No distal contact
c) Second deciduous molar
d) Second permanent molar
e) Second premolar
b) No distal contact
A deep carious lesion in a tooth reaches the pulp. The pulp responds by vasodilatation. There is migration of white blood cells into the pulp. This response is most likely to be initiated by cells in which of the following zones of the pulp?
a) Cell free zone
b) Cell rich zone
c) Odontoblast layer
d) Plexus of Raschow
e) Pulp core
e) Pulp core
A 13 year old boy presents to his general dental practitioner with a broken upper incisor tooth of one day duration. He complains of pain in the tooth when drinking cold water. On examination the enamel
of the incisal edge has been chipped off, and the underlying dentin exposed. Which of the following contents of he dentinal tubule are most likely to be responsible for the pain felt by the patient?
a) Collagen
b) Fluid
c) Nerve endings
d) Odontoblastic process
e) Proteoglycans
b) Fluid
Which of the following types of dentin is continuously produced throughout life?
a) Interglobular dentin
b) Intertubular dentin
c) Intratubular dentin
d) Mantle dentin
e) Tertiary dentin
c) Intratubular dentin
Which of the following ducts arise from secretory end pieces of salivary glands?
a) Striated ducts
b) Excretory ducts
c) Intercalated ducts
d) Interlobular ducts
e) Secretory
c) Intercalated ducts
In a haematoxylin and eosin stained histological section of a salivary gland, the following features are seen: Lightly stained pyramidal cells with flattened nuclei, arranged in tubular patterns. Which of the following cells are likely to have these characteristics?
a) Ductal cells
b) Fibroblasts
c) Mucous cells
d) Myoepithelial cells
e) Serous cells
c) Mucous cells
The part of alveolar bone that surrounds the root of the tooth and gives attachment to the principal fibres of the periodontal ligament is called:
a) Alveolar crest
b) Alveolar process
c) Bundle bone
d) Inner cortical plate
e) Outer cortical plate
c) Bundle bone
When enamel surface is viewed under the microscope, shallow furrows called perikymata are seen. These are likely to be due to
a) Abrasion from tooth brush
b) Attrition from occlusal forces
c) Cracks (lamellae) in enamel
d) Incremental formation of enamel
e) Organic (protein) deposits from the saliva
d) Incremental formation of enamel
Cells that are responsible for the production of reactive dentin are most likely to be present in which of the following areas of pulp?
a) Around blood vessels
b) Cell free zone
c) Cell rich zone
d) Pulp core
e) Pulp periphery
e) Pulp periphery
Which of the following areas of enamel is strongest i.e. most resistant to stresses?
a) Perikymata
b) Enamel tufts
c) Gnarled enamel
d) Hunter Schregger bands
e) Striae of Retzius
c) Gnarled enamel
Ameloblasts form conical projections called Tomes Processes during which of the following stages of amelogenesis?
a) Desmolytic
b) Maturative
c) Morphogenic
d) Protective
e) Secretory
e) Secretory
A child suffers from a febrile illness. During the illness tooth development temporarily slows down. The development resumes normally soon after. This change in development of the tooth structure is most likely to be apparent in which of the following histological features of dentin? a) Dentinal tubules b) Granular layer of Tome’s c) Lines of von Ebner d) Secondary dentin e) Tertiary dentin
c) Lines of von Ebner
Dentin formation is most likely to be initiated by which of the following parts of the enamel organ?
a) Inner enamel epithelium
b) Outer enamel epithelium
c) Reduced enamel epithelium
d) Stellate reticulum
e) Stratum intermedium
a) Inner enamel epithelium
Which of the following types of dentin is likely to have the highest mineral content?
a) Interglobular
b) Inter-tubular
c) Mantle
d) Secondary
e) Sclerotic
e) Sclerotic
Which of the following groups of periodontal ligament fibres are most numerous?
a) Alveolar crest
b) Apical
c) Horizontal
d) Interradicular
e) Oblique
e) Oblique
Differentiation of ameloblasts from the internal enamel epithelium takes place in which of the following stages of tooth development?
a) Bud
b) Cap
c) Early bell
d) Eruption
e) Late bell
c) Early bell
During an illness for a child tooth calcification is disturbed. This will most likely affect teeth that are in which of the following stages of development?
a) Bud
b) Cap
c) Early Bell
d) Late Bell
e) Morphogenic stage
d) Late Bell
Ossification of the mandible starts in which of the following regions?
a) Alveolar process
b) Condyle
c) Coronoid
d) Mental foramen
e) Symphysis menti
d) Mental foramen
Intrinsic and extrinsic muscles of the tongue are the derivatives of which of the following?
a) 1st pharyngeal arch
b) 1st, 3rd, and 4th pharyngeal arches
c) 2nd pharyngeal arch
d) Neural crest cells
e) Occipital myotomes
e) Occipital myotomes
The calcium ions present in saliva are most likely to play a role in which of the following functions of saliva?
a) Antibacterial
b) Buffering
c) Digestion
d) Lubrication
e) Protection
e) Protection
A sample of saliva taken from the human oral cavity is found to contain the enzyme lipase. This sample is likely to have been collected from which of the following areas of the oral cavity?
a) Cheeks
b) Floor of the mouth
c) Lips
d) Palate
e) Tongue
e) Tongue
Movement only in the menisco-temporal (upper) compartment of temporomandibular joint takes place in which of the following motions of the mandible?
a) Closing fully
b) Closing slightly
c) Opening slightly
d) Opening wide
e) Protrusion
e) Protrusion
The morphology of crown of the tooth is determined at which of the following stages of tooth development?
a) Bud stage
b) Cap stage
c) Early bell stage
d) Lamina stage
e) Late bell stage
c) Early bell stage
Which of the following is generally the longest root of maxillary permanent 1st molar?
a) Distal
b) Distobuccal
c) Mesial
d) Mesiobuccal
e) Palatal
e) Palatal
Which of the following sequence of eruption of permanent teeth is normally seen in the maxilla?
a) 1, 6, 2, 4, 3, 5, 7, 8
b) 1, 6, 2, 3, 4, 5, 7, 8
c) 6, 1, 2, 4, 3, 5, 7, 8
d) 6, 1, 2, 3, 4, 5, 7, 8
e) 6, 2, 1, 3, 4, 5, 7, 8
c) 6, 1, 2, 4, 3, 5, 7, 8
The steepest cusp incline is present in which of the following permanent teeth?
a) Maxillary first molar
b) Maxillary first premolar
c) Mandibular first molar
d) Mandibular first premolar
e) Mandibular second molar
b) Maxillary first premolar
Which of the following is the most poorly developed cusp in maxillary second molar?
a) Mesiobuccal
b) Mesiolingual
c) Distobuccal
d) Distolingual
e) Cusp of carabelli
d) Distolingual
A Y shaped occlusal groove is most likely to be present in which of the following teeth?
a) Deciduous premolars
b) Mandibular first premolar
c) Mandibular second premolar
d) Maxillary first premolar
e) Maxillary second premolar
c) Mandibular second premolar
The roots of which of the following permanent tooth are normally completely formed by age ten years?
a) Lower canine
b) Lower second molar
c) Lower second premolar
d) Upper canine
e) Upper central incisor
e) Upper central incisor
The histology of enamel may be best observed using which of the following methods of slide preparation?
a) Decalcified H&E stain
b) Exfoliative cytology
c) Ground section
d) H&E stain
e) PAS stain
c) Ground section
