Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
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
|