MCQs on Developmental Disturbances of Orofacial Region - Oral Pathology Part 1

# A union of the roots of adjacent teeth through the cementum is referred to as :
A. Concrescence
B. Fusion
C. Gemination
D. None of the above

# The term dilaceration refers to :
A. A deformity of a tooth consisting of a sharp bend in the root
B. Abrasions on two surfaces of a single tooth
C. A root or tooth that is split into two
D. A tooth that is fractured at two or more places

MCQs on Periodontal Ligament - Oral Histology Part 4

# The main function of the horizontal fibers of the PDL is:
A. Prevent extrusion
B. Prevent rotation
C. Maintains the mesiodistal width
D. All of the above

# The periodontal ligament is approximately :
A. 0.25 mm inn thickness
B. 0.5 mm in thickness
C. 0.75 mm in thickness
D. 1.0 mm in thickness

# Narrowing of periodontl ligament in labially placed mandibular canine with age is due to :
A. Due to deposition of cementum and bone
B. Down growths of gingival epithelium
C. Gingival cysts formed from cell rests
D. Reversal of function of horizontal and oblique fibers

# Centre of the disc of TMJ is :
A. Avascular
B. Devoid of nervous tissue
C. Avascular and devoid of nervous tissue
D. None of the above

# The type of bone present in the labial area of the anterior teeth is:
A. Cortical
B. Cancellous
C. Osteophytic
D. Exophytic

# The component of future TMJ shows development at:
A. 6 weeks
B. 10 weeks
C. 18 weeks
D. 16 weeks

# In a dried skull, holes on the lingual aspects of the deciduous teeth are called:
A. Volkmann canals
B. Canals of Hirschfeld and Zuckerkandl
C. Haversian canals
D. Gubernacular canals
# A special feature of the periodontal ligament fibroblasts is:
A. The number of organelles
B. Presence of actin fibers and shape change
C. Size of the cells
D. Collagen fiber formation

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MCQs on Periodontal Ligament - Oral Histology Part 3

# Periodontal fibers joining cemental surface of one tooth, to cemental surface of adjacent tooth are called:
A. Gingivodental
B. Cemental fibers
C. Horizontal fibers
D. Transseptal fibers

# Sharpey's fibers are present in:
A. Bone
B. Periosteum
C. Periodontal ligament
D. All of the above

# Interdependency of osteoblasts and osteoclasts in bone remodelling is called as:
A. Lacunae
B. Coupling
C. Reversal lines
D. Canaliculi

# True about osteoclasts:
A. Monocytes are precursor cells of osteoclasts
B. The plasma membrane of osteoclasts adjacent to bone that is being resorbed is known as striated or ruffled border
C. Contain lysosomes with acid phosphates
D. All of the above are true

# Periodontal ligament is made up of :
A. Type I collagen
B. Type I and Type III collagen
C. Type I and Type II collagen
D. Type I and Type IV collagen

# Which of the following is correct ?
A. Fibronectin helps in attachment of fibroblasts to collagen
B. Cementicles are found in periodontal ligament of older individuals
C. The large nerve fibers are myelinated and are concerned with discernment of touch
D.The small nerve fibers may or may not be myelinated and are concerned with discernment of pain
E. All of the ABOVE
# Cementicles are found in the:
A. Gingiva
B. Periodontal ligament
C. Alveolar bone
D. Cementum

# The most abundant group of fibers in the PDL are:
A. Trans septal
B. Horizontal
C. Oblique
D. Apical

# Width of the Periodontal ligament is least at:
A. Cervical third
B. Apical third
C. Fulcrum of rotation
D. It has uniform width

# The rests of Malassez in the periodontal ligament are derived from:
A. Dental pulp
B. Lamina propria
C. Odontogenic epithelium
D. Vestibular lamina

# Development of supporting tissues of the tooth is initiated by :
A. Cells of dental follicle
B. Cells of odontogenic layer
C. Cementoblasts
D. Cells of the gingiva

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MCQs on Periodontal Ligament - Oral Histology part 2

# Width of PDL is :
A. O.10 mm
B. 0.50 mm
C. 0.25 mm
D. 0.75 mm

# Intermediate Plexus is seen in the:
A. Cementum
B. PDL
C. Pulp
D. Dentin

# In mammals independent and tough suspension for teeth is provided by:
A. Alveolar sockets
B. Cementum
C. Gubernacular cords
D. Periodontal membrane

# Bone adjacent to periodontal ligament that contains a great number of Sharpey's fibers is known as :
A. Lamina dura
B. Bundle bone
C. Lamina propria
D. Lamina densa

# The most abundant principal fiber group in periodontal ligament is :
A. Horizontal
B. Transseptal
C. Apical
D. Oblique

# Collagen biosynthesis occurs inside the :
A. Chondroblasts
B. Odontoblasts
C. Osteoblasts
D. Fibroblasts

# Which of the following groups of fibers are not attached to alveolar bone ?
A. Apical
B. Horizontal
C. Oblique
D. Transseptal
# Principal fibers of PDL are attached to :
A. Alveolar bone proper
B. Bundle bone
C. Lamellar bone
D. Cortical bone

# Periodontal ligament has predominantly:
A. Type II collagen fibers
B. Oxytalan fibers
C. Elastic fibers
D. Type I collagen fibers

# The calcified mass found in PDL are:
A. Cementicles
B. Osteoblasts
C. Cementoclasts
D. Osteoclasts

# Sharpey's fibers are derived from:
A. Hertwig's root sheath
B. Epithelial rest cells of Malassez
C. Alveolar bone
D. Dental follicle

# Intermediate plexus is absent in which of the following principal fibers:
A. Gingival
B. Oblique
C. Horizontal
D. Transseptal

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