Tooth Eruption and Shedding Flashcards
Which of the following statement is false______________?
A. Resorption of roots of deciduous incisors and canines begins on their lingual surfaces
B. Resorption of roots of deciduous molars begins on their inner surfaces
C. Shedding of deciduous teeth is delayed in the absence of their successor teeth
D. All of the above
D. All of the above
Osteoblasts appear basic gram staining due to______________?
A. Increased ribonucleic acid
B. Acidic ground substance
C. Increased mitochondria
D. Presence of basic ground substance
A. Increased ribonucleic acid
The maximum rate of eruption, as the tooth cusps reach the surface epithelium is around ________ μm/day?
A. 100
B. 75
C. 50
D. 25
B. 75
Calcified tissue is absent in______________?
A. Enamel
B. Dentin
C. Cementum
D. Pulp
D. Pulp
Which of the following factors are primarily contributory to the shedding of deciduous tooth?
A. Hydrostatic
B. Vascular pressure
C. Oncotic pressure
D. Masticatory pressure
D. Masticatory pressure
The apical foramen of a fully developed permanent tooth is usually lined by_____________?
A. Dentin
B. Cementum
C. Epithelial rest cells
D. The Epithelial diaphragm
B. Cementum
Specific stain for fat cells is___________?
A. Eosin & haematoxylin
B. Carbol fuschin
C. Sudan III
D. Cresyl violet
C. Sudan III
Extracted teeth should be preserved in_____________?
A. Saline
B. Xylene
C. 10% Formalin
D. 10% alcohol
C. 10% Formalin
Oral tissue for microscopic examination is prepared by_______________?
A. Embedded in paraffin and sectioned
B. Embedded in paradion and sectioned
C. Frozen and sectioned
D. Specimens ground into thin sections
E. All of the above
E. All of the above
Which enzyme is associated with the mineralization_____________?
A. Acid phosphatase
B. Alkaline phosphatase
C. Adenosine triphosphate
D. Amino peptidase
B. Alkaline phosphatase
Hammock ligament is present_______________?
A. Between temporal and sphenoid bone
B. Between hamular notch and mandible
C. In apical area of a tooth
D. As a part of deep cervical fascia
D. As a part of deep cervical fascia
The most accepted theory of tooth eruption is____________?
A. Hydrodynamic theory
B. Clone theory
C. Periodontal ligament traction theory
D. Vascular theory
C. Periodontal ligament traction theory
Teeth with out antagonist if erupt is called____________?
A. Stable
B. Over erupted
C. Supra erupted
D. Submerged
C. Supra erupted
Movement of tooth to close the intermaxillary gap during eruption is due to____________?
A. Physiological tooth migration
B. Active eruption
C. Passive eruption
D. None of the above
B. Active eruption
In mineralization which one of the following is known as Epitaxy?
A. Booster Mechanism
B. Seeding theory
C. Alkaline Phosphatase theory
D. Cartier/s Adenosine Triphosphate theory
B. Seeding theory
The first sign of future deciduous teeth as a thickening of oral ectoderm appears at about_____________?
A. 25th day of Intra uterine life
B. 34th day of Intra uterine life
C. 56th day of Intra uterine life
D. 20 wks of Intra uterine life
C. 56th day of Intra uterine life
The deciduous teeth can be differentiated from permanent teeth by_____________?
A. Enamel prismatic arrangement
B. Dentinal tubule arrangement
C. Primary and secondary dentin
D. Mineral content
A. Enamel prismatic arrangement
Which type of collagen fibers demonstrates Chicken wire configuration?
A. Type I
B. Type II
C. Type III
D. Type IV
D. Type IV
Accentuated incremental lines in dentin are______________?
A. Incremental lines of retzius
B. Incremental lines of von Ebner
C. Contour lines lines of owen
D. None of the above
C. Contour lines lines of owen
Gubernacular canal and gubernacular cord are seen in relation to____________?
A. Permanent teeth
B. Deciduous teeth
C. Succedaneous teeth
D. None of the above
C. Succedaneous teeth
The cells, which are responsible for removal of bone matrix in bone resorption, are_____________?
A. Osteoblast
B. Fibrocytes
C. Polymorphs
D. Osteoclasts
D. Osteoclasts
Frozen sections can be used for the demonstration of_____________?
A. Fat
B. Mucin
C. Cartilage
D. Iron
A. Fat
Dehydration of specimen is carried out by____________?
A. By using 10% formalin
B. By using liquid or solid Co2
C. By using increasing percentages of alcohol
D. By using 5% nitric acid
C. By using increasing percentages of alcohol
A suitable fixative for a routine biopsy specimen is_____________?
A. 10% formalin
B. 40% formalin
C. 20% formalin
D. 10% alcohol
A. 10% formalin
Epithelial attachment is derived from____________?
A. Reduced enamel epithelium
B. Dental papilla
C. Inner enamel epithelium
D. Dental sac
A. Reduced enamel epithelium
Tooth buds of permanent mandibular incisors are situated_____________?
A. Lingual to primary teeth
B. Inferior to primary teeth
C. Labial to primary teeth
D. A and B
D. A and B
Gubernacular canal guides the eruption of_____________?
A. Primary teeth
B. Permanent teeth
C. Both A and B
D. None of the above
B. Permanent teeth
Resorption of dental tissue is caused by_____________?
A. Osteoclasts
B. Osteoblasts
C. Odontoclasts
D. Odontoblasts
C. Odontoclasts
Tooth eruption is due to______________?
A. Osteoclastic activity
B. Proliferation of cells at crypt
C. Exforliation of primary tooth
D. Eruptive force
D. Eruptive force
In resorption of roots of the primary teeth, the dental pulp_____________?
A. Plays a passive role
B. Becomes a fibrotic non-vital mass
C. Initiates resorption from the inner surface of roots
D. Aids in formation of secondary dentin slowing down resorption
A. Plays a passive role
The first permanent tooth to erupt in the oral cavity is the:
A. Mandibular central incisor
B. Mandibular First Molar
C. Maxillary Central Incisor
D. Maxillary First Molar
B. Mandibular First Molar
The age of a child having 12 permanent and 12 deciduous teeth is:?
A. Four and half years
B. Eight and half years
C. Eleven and half years
D. Thirteen years
E. Fourteen years
B. Eight and half years
The last primary tooth to be replaced by a permanent tooth is usually the:
A. Maxillary second molar
B. Mandibular second molar
C. Maxillary canine
D. Mandibular canine
C. Maxillary canine
The most common sequence of eruption of the permanent maxillary teeth in children is:
A. 1-6-2-3-4-7-5-8
B. 2-3-1-6-7-5-4-8
C. 6-1-2-4-3-5-7-8
D. 6-1-2-3-4-5-7-8
C. 6-1-2-4-3-5-7-8
Calcification of permanent first molar usually begins:
A. In the third month of intrauterine life
B. In the sixth month of intrauterine life
C. At birth
D. In the third month after birth
C. At birth
A radiograph of a four year child reveals no evidence of calcification of mandibular second premolar. This indicates:
A. It is too early to make final prediction
B. The teeth may develop later
C. Primary second molar extracted to allow mesial drifting of permanent first molar
D. The child may never develop premolars
B. The teeth may develop later
The usual order of appearance of the primary teeth in the mouth is:
A. Central incisors, first molars, lateral incisors, second molars, canines
B. Central incisors, lateral incisors, canines, second molars, first molars
C. Central incisors, lateral incisors, first molars, second molars, canines
D. Central incisors, lateral incisors, first molars, canines , second molars
D. Central incisors, lateral incisors, first molars, canines , second molars
First evidence of initiation of primary dentition is usually around?
A. 4 months in utero
B. Birth
C. 4 months after birth
D. One year after birth
A. 4 months in utero
Eruption of deciduous maxillary second molar occurs at:
A. 20 months
B. 18 months
C. 24 months
D. 28 months
D. 28 months
The sequence of eruption of permanent teeth in mandible is:
A. 1-6-2-3-5-4-7-8
B. 6-1-2-3-4-5-7-8
C. 6-1-2-4-5-3-7-8
D. 6-1-2-4-3-5-7-8
C. 6-1-2-4-5-3-7-8
Dentition of human is?
A. Herbivorous
B. Omnivorous
C. Carnivorous
D. None of the above
B. Omnivorous
Number of teeth seen on X-ray at birth is:
A. 20
B. 22
C. 24
D. 30
C. 24
At birth the following teeth are calcifying:
A. Primary incisors and first molar
B. Primary canines and second molars
C. Permanent canines
D. Permanent third molar
A. Primary incisors and first molar
James, a 6 year old child received tetracycline. Noticeable discoloration will be seen in ?
A. Canines, premolars and second molars
B. Canines and second molars
C. Incisors and first molars
D. Incisors, premolars and first molars
A. Canines, premolars and second molars
Once the enamel formation is complete, the tooth will erupt after approximately?
A. One year
B. Two years
C. Three years
D. Four years
C. Three years
Calcification of third molar begins at?
A. 8 months
B. 18 months
C. 8 years
D. 16 years
C. 8 years
The deciduous canine emerges?
A. Before lateral incisor
B. Before first molar
C. After first molar
D. After second molar
C. After first molar
Which of these teeth are highly sturdy and usually the last ones to be lost ?
A. Canines
B. Premolars
C. First molar
D. Central incisors
A. Canines
The root growth theory of eruption proposes that eruption is due to the push of the:
A. Elongating roots against the base of the alveolar crypt
B. Proliferating periodontal ligament
C. Expanding pulp in the root canals against the alveolar crypt
A. Elongating roots against the base of the alveolar crypt
Active eruption of the tooth:
a. Begins as soon as the roots have begun to develop
b. Begins as the occlusal tip starts moving toward the occlusal plane
c. Begins when the apical cementum is deposited on the roots of the tooth
d. Continues until occlusal contact has been made
e. Continues until exposure of the cementum has occurred
A. B & D
B. A only
C. A, B & E
A. B & D
The recession of the gingiva, which continues gradually until various amounts of cementum have been exposed:
Passive Eruption
Continuous eruption maintains occlusion during tooth attrition. What mechanism is responsible for this ongoing eruption?
A. Alveolar bone growth
B. Root dentin formation
C. Cementum deposition
D. Enamel deposition
C. Cementum deposition
Which process INCORRECTLY describes tooth eruption?
A. Formation of Hertwig’s root sheath
B. Completion of crown synthesis
C. Induction of dental follicle cells to become odondoblasts
D. Alveolar bone remodeling
E. Deposition of intermediate cementum
C. Induction of dental follicle cells to become odondoblasts
