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