DENT 1020 Oral Embryology (Ch. 6, 15) Flashcards
The dental sac will form the: A) Epithelial rests of Malassez B) Secondary dental lamina C) Periodontal ligament D) All of the above
C) Periodontal ligament
Which of the following embryonic structures becomes the dentinoenamel junction?
A) Inner cells of the dental papilla
B) Outer cells of the dental papilla
C) Inner enamel epithelium of the enamel organ
D) Disintegrating basement membrane
D) Disintegrating basement membrane
Cementoblasts undergo cementogenesis laying down \_\_\_\_\_? A) Cementoid B) Cementoblasts C) Cementocytes D) Pre Cementum
A) Cementoid
A patient has supernumerary molars distal to her third molars. These additional molars are the product of escessive inductions of the: A) Dental sac B) Enamel organ C) Primary dental lamina D) Secondary dental lamina E) Reduced enamel epithelium
C) Primary dental lamina
The developmental disturbances that result in: dens in dente, gemination, and fusion are created during which stage of tooth development? A) Initiation stage B) Bud stage C) Cap stage D) Bell stage E) Apposition stage
C) Cap stage
Which of the following is formed by the cells of the enamel organ at its most cervical point and will guide root formation? A) Dental sac B) Enamel cuticle C) Epithelial rests of Malassez D) Hertwig's epithelial root sheath
D) Hertwig’s epithelial root sheath
The reduced enamel epithelium (REE) will form the primordium of which structure(s)? A) Cementoblasts B) Lamina dura of the bone C) Periodontal ligament D) Junctional epithelium E) All of the above
D) Junctional epithelium
Dentinogenesis begins after which of the following occur?
A) Preameloblasts differentiate into ameloblasts
B) Basement membrane disintegrates
C) IEE cells repolarize
D) All of the above
C) IEE cells repolarize
During which stage is the primordium of the tooth (a.k.a. "tooth germ") first manifest? A) Induction B) Bud C) Cap D) Bell E) Apposition
C) Cap
Which of the following is NOT a component of the tooth germ? A) Dental lamina B) Dental papilla C) Dental sac D) Enamel organ
A) Dental lamina
During the process of tooth eruption the REE performs which of the following functions?
A) It fuses with the oral epithelium
B) It releases enzymes to help disintegrate the oral epithelium
C) It peels off coronally allowing the tooth to “erupt”
D) It remains attached at the CEJ (cervix) maintaining a temporary seal
E) All of the above
E) All of the above
Which of the following pairs does NOT represent a true embryologic relationship? A) Epiblast -> Ectoderm B) Hypoblast -> Endoderm C) Ectoderm -> Enamel D) Hypoblast -> Mesenchyme
D) Hypoblast -> Mesenchyme
Of the three primary embryonic layers, the one that will form the dentin and pulp is the:
A) Ectoderm
B) Endoderm
C) Mesoderm
C) Mesoderm
Teeth are formed from which of the following embryonic tissues? A) Endoderm and ectoderm B) Ectoderm and mesenchyme C) Endoderm and mesenchyme D) Ectoderm, mesenchyme, and endoderm
B) Ectoderm and mesenchyme
Hertwig’s epithelial root sheath is entirely composed of:
A) All layers of the enamel organ
B) Enamel organ and dental papilla
C) Inner and outer cells of the dental papilla
D) Inner and outer enamel epithelium
E) Dental sac and dental papilla
D) Inner and outer enamel epithelium
Which of the following PERMANENT teeth are formed by the secondary dental lamina? A) Incisors B) Canines C) Premolars D) Molars E) A, B, and C
E) A, B, and C
The extensions of the primary dental lamina into the mesenchyme form cap-like structures (cap stage). A) Tooth germ B) Enamel organ C) Dental papilla D) Secondary dental lamina
B) Enamel organ
The outer cells of the dental papilla are induced to differentiate into: A) Pulp tissue B) Preameloblasts C) Odontoblasts D) Cementoblasts E) Ameloblasts
C) Odontoblasts
The enamel organ is composed of four layers of cells. The cells that will eventually differentiate into ameloblasts are the cells of the: A) Stellate reticulum B) Outer enamel epithelium C) Inner enamel epithelium D) Reduced enamel epithelium
C) Inner enamel epithelium
The cellular extensions of the Odontoblasts that remain attached to the basement membrane as dentin forms are called: A) Enamel spindles B) Dentinal fibrils C) Dentinal tubules D) Odontoblastic processes
D) Odontoblastic processes
The premaxilla contains tooth buds of the:
A) Incisors
B) Incisors and canines
C) Incisors, canines, and premolars
D) Incisors, canines, premolars, and molars
A) Incisors
Cells found in the periodontal ligament that can undergo proliferation under certain pathologic conditions to produce cysts and tumors of the jaw are: A) Cementoblasts B) Epithelial rests of Malassez C) Hertwig's epithelial root sheath D) Macrophages E) Mast cells
B) Epithelial rests of Malsses
List the order of the stages of tooth formation:
A) Bell stage, cap stage, apposition, initiation stage, bud stage
B) Apposition, bell stage, cap stage, bud stage, initiation stage
C) Bud stage, cap stage, bell stage, apposition, initiation stage
D) Initiation stage, bud stage, cap stage, bell stage, apposition
E) Initiation stage, apposition, bud stage, cap stage, bell stage
D) Initiation stage, bud stage, cap stage, bell stage, apposition
The fourth lobe on the lingual aspect of anterior teeth is referred to as: A) Incisal edge B) Distal labial lobe C) Mammelon D) Cingulum
D) Cingulum
Using the Universal or ADA tooth numbering system, which of the following would represent the permanent mandibular left second premolar? A) #28 B) #21 C) #13 D) #20 E) #29
D) #20
Which of the following teeth is succedaneous? A) #13 B) #14 C) #18 D) #30
A) #13
Which of the following is the correct order of terms used when naming teeth? A) Tooth, dentition, arch, quadrant B) Dentition, arch, quadrant, tooth C) Arch, dentition, quadrant, tooth D) Quadrant, dentition, arch, tooth
B) Dentition, arch, quadrant, tooth (DAQT)
Using the Universal or ADA tooth numbering system, which of the following would represent the deciduous mandibular left second molar? A) A B) J C) K D) S E) T
C) K
Using the Palmar notation, |2 would represent the:
A) Deciduous maxillary left lateral incisor
B) Permanent maxillary left lateral incisor
C) Deciduous maxillary right lateral incisor
D) Permanent maxillary right lateral incisor
B) Permanent maxillary left lateral incisor
Which of the following are succedaneous teeth?
A) Those that replace deciduous teeth
B) Those that do not replace deciduous teeth
C) The deciduous molars
D) The permanent premolars
E) Both A and D
E) Both A and D
Of the following teeth, which are designed for biting into (cutting) food? A) Incisors B) Canines C) Premolars D) Molars
A) Incisors
The degree of mineralization of normal cementum is approximately that of:` A) Dentin B) Bone C) Enamel D) Cartilage
B) Bone
The bulk (largest amount) of tooth structure is made up of the: A) Pulp B) Dentin C) Enamel D) Cementum
B) Dentin
The place where the anatomical crown and the anatomical root meet is called the: A) Cervix B) Furcation C) Root trunk D) Dentoenamel junction
A) Cervix
When a tooth is just erupting into the oral cavity, only a small portion of the enamel is visible. The part of the tooth that is visible is called the: A) Clinical root B) Clinical crown C) Anatomical root D) Anatomical crown
B) Clinical crown
When two surfaces of a tooth come together this is called a: A) Line angle B) Point angle C) Contact point D) Corner angle E) Interproximal area
A) Line angle
An incomplete closure of two or more developmental lobes is called a: A) Pit B) Fossa C) Fissure D) Developmental depression
C) Fissure
The mixed dentition period usually begins with what?
A) Eruption of a permanent mandibular central incisor
B) Eruption of a permanent maxillary central incisor
C) Eruption of a permanent mandibular first molar
D) Eruption of a permanent maxillary first molar
C) Eruption of a permanent mandibular first molar
The rounded, elevated folds of enamel found on the mesial and distal surfaces of anterior teeth (visible from the lingual) are called? A) Mammelons B) Cingulum C) Lingual fossa D) Marginal ridges
D) Marginal ridges
When comparing the arches of the two dentitions (primary vs permanent), one arch of the primary dentition usually contains: A) Two more incisors B) Four more total teeth C) Four less molars D) Two less anterior teeth E) Six fewer total teeth
E) Six fewer total teeth
Which of the following features is noted on a newly erupted permanent mandibular canine?
A) Cingulum offset to the mesial
B) Labial height of contour in the incisal third
C) Mesial cusp slope is shorter than the distal
D) Well demarcated marginal ridges
C) Mesial cusp slope is shorter than the distal
The permanent mandibular canines erupt between ages: A) 11-12 B) 6-8 C) 7-8 D) 9-10
D) 9-10
The mixed dentition stage usually begins around what age? A) 6 B) 8 C) 10 D) 12
A) 6
Which of the following is true of enamel? A) It is translucent B) It contains no living cells C) It is the hardest tissue in the body D) All of the above
D) All of the above
Which of the following cementum-enamel relationships is most common?
A) Overlap
B) Butte joint
C) Gap
A) Overlap
Which anterior tooth is most likely to have a lingual pit at the junction of the cingulum and fossae? A) Maxillary central incisor B) Maxillary lateral incisor C) Mandibular lateral incisor D) Maxillary canine
B) Maxillary lateral incisor
Which of the following anomalies is NOT characteristically associate with maxillary central incisors? A) Supernumerary B) Microdontia C) Avulsion D) Diastema
B) Microdontia
Which of the following teeth is MOST likely to have a bifurcated root? A) Maxillary lateral incisors B) Mandibular lateral incisors C) Maxillary canines D) Mandibular canines
C) Maxillary canines
Tooth photo A B C D E
A - Cementum B - Pulp C - CEJ D - Dentin E - Enamel
One of the disturbances that can occur during root formation is: A) Enamel pearls B) Biforcated root C) Accessory roots D) Both A and B E) All of the above
C) Accessory roots – all of the above?
