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122 Cards in this Set

  • Front
  • Back
parts of the periodontuim
cementum alveolar bone, PDL, gingiva
Characteristics of cementum
no innervation
Avascular
paler and softer than dentin
Gets nutrition from PDL
Forms throughout life of tooth
Makeup of cementum
3
65% mineralized
23% organic
12% water
Cementum develops from the
Dental sac
Sharpey's fibers
connect cementum to bone
What cells are responsible for resorption of dentin and cementum
odontoclasts
Cementum cannot repair itself
tf
False, it can
Hypercementos
excessive formation of cellular cementum, usually at apex from trauma
Composition of alveolar bone
60% mineralized
25% organic
15% water
Alveolar bone proper
lines tooth socket, aka cribiform plate
Functions of PDL
Sensory, nutrition, remodeling
Alveolodental ligaments
Alveolar crest group
Horizontal
oblique (most numerous)
apical
interradicular
Gingival fiber groups (Support gingiva)
circular
dentogingival
alveologingival
dentoperiosteal
accessory canals
extra openings from the pulp to the PDL
Ameloblasts
Group of columnar epithelial cells that make enamel
Anaphase
third phase of mitosis, which involves separation of the two chromatids of each chromosome and migration of the opposite poles of the cell
Bell stage 3
Fourth stage of tooth development, 11-12 weeks,
enamel organ is differentiated into 4 layers
Branchial apparatus consists of
3
Branchial arches,
branchial grooves and membranes,
pharyngeal pouches
Bud stage
3
2nd stage of tooth development
8th week
growth of dental lamina into buds penetrating the ectomesenchyme, each developing into a tooth germ
Cap stage
3rd stage of tooth development
9-10 weeks
tooth bud's dental lamina differentiates into the enamel organ
Cementocytes
Cementoblasts entrapped by the cementum they produce
Chromatin
Cheif nucleoprotein in the nondividing nucleoplasm
Cleft lip=failure of fusion of
maxillary processes with the medial nasal processes
cleft palate=lack of union at
midline of palate
Contour lines of owen
Adjoining parallel imbrication lines in dentin that demonstrate disturbance in body metabolism that affects odontoblasts
Dental papilla (developmental)
Structure from ectomesenchyme that is coverd by the enamel organ and will produce future dentil and pulp tissue of mesenchymal origin
Dental sac
formed from remaining ectomesenchyme that surrounds the enamel organ
will produce periodontuum, cementum, PDL, and alveolat bone
Embryo
Derived from implanted blastocyst
Embryonic period
Weeks 2-8
Implanted blastocyst becomes an embryo after the first week
Endoplasmic reticulum
membrane bound organelle
rough or smooth
Fetal period
Weeks 9-birth
Maturation of existing structures as embryo becomes fetus
Fetus
Derived from embryo
Golgi apparatus
Organelle involved in protein segregation, packaging, and transport
Hertwig's epithelial root sheath
Part of cervical loop that functions to shape roots and induce dentin formation
Hunter-schreger bands
light and dark bands perpendicular to the DEJ caused by curvature of rods
Imbrication lines of Von Ebner
Incremental lines in dentin that stain darkly and show daily production
Interphase
When cell is between divisions
Lamina dura
radiopaque line representing alveolar bone proper
When is primary dentition period?
6 months-6 years
When is mixed dentition?
6-12 yrs
Eruption of primary Md centrals
8 months
Eruption of primary mx centrals
10 mos
Eruption of primary mx laterals
11 mos
Eruption of primary md laterals
13 mos
Eruption of primary md canines
20 mos
Eruption of primary mx canines
19 mos
Eruption of primary mx first molar
16 mos
Eruption of primary mx 2nd molar
29
Eruption of primary md first molar
16 mos
Eruption of primary md 2nd molar
27 mos
What age do the md perm centrals come in? With what teeth?
6-7 yrs, with all perm first molars
Permanent max centrals come in when, with what teeth?
7-8 years, with md lateral
Perm max laterals come in when?
8-9 yrs
Perm md canines come in when?
9-10yrs
Perm mx canines come in when?
11-12yrs
All perm premolars come in when?
10-12 yrs
All perm 2nd molars come in when?
11-13 yrs
When is Preimplantation period?
Embryonic period?
Fetal period?
First week
2nd-8th week
3rd-9th week
When do branchial arches form?
4th week
The first branchial arch is the ______ arch, and contains ___________
Mandibular arch
Meckel's cartilage
What kind of cartilage does the second branchial arch have?
Reichert's cartilage
1st pharyngeal pouch becomes...
Auditory tubes
2nd pharyngeal pouch becomes
Palatine tonsil
3rd & 4th pharyngeal pouch becomes
thymus gland and parathyroid glands
The formation of a more specialized cell from a primitive cell is
Histodifferentiation
What does IEE diffenentiate into?
Ameloblast
What is the purpose of the OEE?
Protective barrier for the enamel organ
When does the tongue develop?
4th-8th week
Dental papilla forms what?
Dentin and pulp
What is the tuburculum impar?
Median dongue bud, forms tongue with the lingual swellings
What structure forms DEJ?
Basement membrane-what separates the enamel organ from the dental papilla
What part of the trilaminar disc makes oral epithelium, teeth, and associated structures?
Ectoderm
What does the copula form?
Base of the tongue (posteror 1/3)
What does the spiglottic swelling form?
Post posterior region of tongue and epiglottis, behind copula
Sulcus terminalis
V shape between base and body of tongue
What forms dental lamina?
Oral epithelium (from ectoderm)
What forms tooth germ?
Dental lamina
(Ectoderm, oral epithelium, dental lamina, tooth germ, underlying tissue)
What determines the shape of the tooth?
Hertwig's sheath
Dental papilla forms what?
Dentin and pulp
What is the tuburculum impar?
Median dongue bud, forms tongue with the lingual swellings
What structure forms DEJ?
Basement membrane-what separates the enamel organ from the dental papilla
What part of the trilaminar disc makes oral epithelium, teeth, and associated structures?
Ectoderm
What does the copula form?
Base of the tongue (posteror 1/3)
What does the spiglottic swelling form?
Post posterior region of tongue and epiglottis, behind copula
Sulcus terminalis
V shape between base and body of tongue
What forms dental lamina?
Oral epithelium (from ectoderm)
What forms tooth germ?
Dental lamina
(Ectoderm, oral epithelium, dental lamina, tooth germ, underlying tissue)
What determines the shape of the tooth root?
Hertwig's sheath
Rests of Malassez are what and where?
In mature PDL, may become cystic =[
What is the makeup of enamel?
96% inorganic (mineralized)
1% organic
3% water
What is the makeup of dentin?
70% inorganic (mineralized)
20% organic
10% water
What is the makeup of cementum?
65% mineralized
23% organic
12% water
What is the makeup of alveolar bone?
60% mineralized
25% organic
15% water
Perikymata is what?
Valleys/ grooves (vertical)
Lines of Retzius are what?
Like tree trunk lines
Imbrication lines
Hills (Vertical)
Neonatal line
most accentuated incremental line of Retzius
What is created with the changes in direction of developing enamel rods?
Hunter-Schreger bands
Where are odontoblasts found?
Pulp, they are responsible for dentin formation
Where is cellular cementum?
Apical and furcation of roots. Closer to dentin= less cementocytes=acellular
What is the most common tupe of epithelium found in mouth?
Stratified squamous
What tongue papillae does not have taste buds?
Filiform
Epithelial rests of Malassez are associated with...
enamel organ
What lingual papilla is most keratinized?
Filiform
What type of bone increases in amount bc of an increase in occlusal activity?
Trabecular
What is schlerotic dentin?
Type of reparative dentin form injury, chronic caries and aging
Corkscrew-shaped structures that lie among dentin are called
Korff's fibers
What are extensions of odontoblastic process into enamel
Enamel spindles
How often does cleft lip occur?
1 in 1,000
How often does cleft palate occur?
1 in 2,500
Ankyloglossia
Short lingual frenum
When does tongue develop?
4-8 weeks
The differentiation of the enamel organ into four layers occurs in what stage?
Bell stage-11-12 weeks
What are the four layers of the enamel organ?
OEE, IEE, Stellate reticulum, stratum intermedium
Ca10(PO4)6(OH)2 is what?
Enamel
What three things are made up of calcium hydroxyapatite?
Enamel, dentin, cementum
Alveolar crest is apical to the CEJ by how much?
1-2mm
What is the most common cell in the PDL?
Fibroblast
Oral epithelium is classified as
stratified squamous epithelium
Sulcular epithelium is keratinized. TF
False
What is lamina properia?
Connective tissue of the gingival tissue
Brush ends of principal fibers of the PDL that are embedded in both cememtum and alveolar bone are what?
Sharpey's fibers