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1) Fibres of periodontal ligament embedded in the bone are_____________? a. Sharpey’s fibres b. Tomes fibres c. Elastic fibres d. Ray’s fibres
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2) The attached apparatus of tooth is composed of______________? a. Gingiva, cementum and alveolar bone b. Gingiva and cementum c. Cementum and periodontal ligament d. Peridontal ligament the cementum and the alveolar bone
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3) Age changes in periodeontal ligament include which of the following ? a. Increased fibroplasia b. Increased vascularity c. Increased thickness d. Decreased in number of cementicles
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4) Collagen molecule exhibits all of the following features except_____________? a. Triple pleated sheath b. Mostly contains glycine residues c. Exhibit cross striations at 64 μm d. Intracellular in nature
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5) Which of the following is not the principle fibre group of the periodontal ligament___________? a. Horizontal b. Oblique c. Alveolar crest d. Transseplat
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6) A special feature of the periodontal ligament fibroblasts is______________? a. The number or organelles b. Presence of actin fibres and shape change c. size of the cells d. Collagen fibre formation
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7) The component of future T.M.J shows development at _____________? a. 6 weeks b. 10 weeks c. 18 weeks d. 16 weeks
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8) Centre of the disc in TMJ is_____________? a. Avascular b. Devoid of nervous tissue c. Avascular & deviod of nervous tissue d. None of the above
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9) Narrowing of periodontal 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 fibres
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10) The main function of horizontal fibres of P.D ligament is____________? a. Prevent extrusion b. Prevent rotation c. Maintains the mesiodistal width d. All of the above
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11) The rest of malassez in the periodontal ligament are derived from_____________? a. Dental pulp b. Lamina propria c. Odontogenic epithelium d. Vestibular lamina
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12) The most abundant group of fibres in the PDL are_____________? a. Trans-septal b. Horizontal c. Oblique d. Apical
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13) 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
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14) Sharpey’s fibres are present in_______________? a. Bone b. Periosteum c. Periodontal ligament d. All of the above
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15) Intermediate plexus is absent in which of the following principle fibres_____________? a. Gingival b. Oblique c. Horizontal d. Transseptal
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16) The calcified mass found in the PDL are_____________? a. Cementicles b. Osteoblasts c. Cementoclasts d. Osteoclasts
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17) Principal fibres of periodontal ligament are attached to_____________? a. Alveolar bone proper b. Bundle bone c. Lamellar bone d. Cortical bone
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18) Collagen biosynthesis occurs inside the______________? a. Chondroblasts b. Odontoblasts c. Osteoblasts d. Fibroblasts
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19) Bone adjacent to periodontal ligament that contains a great number of sharpey’s fibres is known as______________? a. Lamina dura b. Bundle bone c. Lamina propria d. Lamina densa
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20) Intermediate plexus is seen in the____________? a. Cementum b. PDL c. Pulp d. Dentin
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21) The vascular supply of the periodontal ligament is______________? a. Greatest in the middle-third of a single rotted tooth b. Greatest in the middle-third of a multirooted tooth c. A net like plexus that runs closer to the cementum than to the bone d. A net like plexus that runs closer to the bone than to the cementum
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22) All of the following cells of periodontal ligament are of mesenchymal origin except______________? a. Fibroblasts b. Multi totipotent cells c. Cementoblasts d. Cell rests of malassez
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23) Remnants of the Hertwig’s root sheath are found in____________? a. Gingiva b. Alveolar bone c. Periodontal ligament d. Cementum
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24) Anchoring fibrills are composed of_____________? a. Type V and VII collagen b. Type I and III collagen c. Type IV collagen d. Type IV and III Collagen
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25) The periodontal ligament_____________? a. Derives its blood supply primarily from the branches of vessels entering the pulp b. Has a slow rate of turn over c. Contains epithelial cells d. Comprises primarily of type II collagen
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26) Which dental tissue doesn’t contain nerves ? a. Bone b. Dentin c. Cementum d. Pulp
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27) Which of the following is least mineralized ? a. Cementoid b. Incremental line c. Cellular cementum d. Acellular cementum
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28) Root lengthening is contributed by____________? a. Cellular cementum b. Acellular cementum c. Intermediate cementum d. All of the above
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29) Trauma or excessive occlusal forces causes_____________? a. Hyperplasia of cementum b. Hypertrophy of cementum c. Resorption of cementum d. None of the above
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30) At the CEJ cementum overlaps enamel about____________? a. 55 to 60% b. 60 to 65% c. 65 to 70% d. 70 to 75%
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