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Teeth and Parodontiumstructure, development
Ivo Klepáček
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OROFACIAL SYSTEMMultifunctional complex of structures
CNSMuscles Joints
Teeth Jaws
Periodontium (parodontium)
fonationspeechmasticationdigestion
TEETH PARODONTIUM
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TEETH
tooth Dens, dentis lat.
Odus, odontos gr.
DENTES
(dens incisivus, caninus, premolaris, molaris (Y5 formula)
TEETH PARODONTIUM
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Zuby –teeth částiparts
• Korunka crown(corona)
• krček neck(cervix)
• kořen root (radix)
• dřeň pulp (pulpa)
TEETH PARODONTIUM
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Main termsTEETH PARODONTIUM
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Hard tissues:EnamelumDentinumCementum
Soft tissues:Pulpa dentisPeriodontium
ODONTIUMEndodontium Ektodontium Periodontium TEETH PARODONTIUM
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Teeth
• Firast and second dentition dentes decidui (lactales), permanentes
tooth masticating cusps rootsI incisal crest 1C 2 oblique crests 1P 2 cusps 1 (2)M - upper 4 ; fissures „H“ 3
- lower 4 (5) ; fissures + 2
„H“
„+“
TEETH PARODONTIUM
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upper teeth lower teeth Pulp changes through life
TEETH PARODONTIUM
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TEETH PARODONTIUM
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FDIFedérale Dentaire InternationaleADAAmerican Dental Association
TEETH PARODONTIUM
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Stálé Dočasné
Permanentes Lactei32 20
TEETH PARODONTIUM
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Enamelsubstantia adamantinosa
• The most firm body part• Organic part
– Formed by ameloblasts– glykoproteins
(amelogenins, enamelins)
• Anorganic part 95%– hydroxyapatite
• Arranged in prisms• Among them there is the
interprismatic substance
Prisms; interprismaticsubstance, crystals
Ameloblasts
TEETH PARODONTIUM
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Ameloblast: structure
Secretion and reabsorbtion during enamelic matrix formation
Tomes fibers
Secretion
Tomes fiber
reabsorbtion
Nexus , desmosomes, tight junctions
Sir John Tomes, (1815-1895), Engl. surgeon
TEETH PARODONTIUM
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Enamel structureCrystals, prisms and interprismatic substance (short and long molecules)
Prisms proceed to surface in various angles
TEETH PARODONTIUM
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ParazonesDiazones
TEETH PARODONTIUM
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Hunter-Schreger strips, striae
Retzius strips, striae
Perikymata ridges, grooves
TEETH PARODONTIUM
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Dentinesubstantia dentinum
• calcified connectivetissue
• Organic part– colllagen I,
proteoglycans– Formed by odontoblasts
• Located on the innerdentine surface
• Tomes fibers• Anorganic part
– hydroxyapatite• No-calcified dentine
• predentin• Closely to the enamel and
cementum
TEETH PARODONTIUM
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Dentin odontoblasts
dentine tubules
Retzius linesvonEbner
Developmental order:
PrimarySecondaryTerciary
Folowing location:
MantleCircumpulpalInterdentinGlobularPredentin
Odontoblasts, matrix, fibers
TEETH PARODONTIUM
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ODONTOBLASTS AND AMELOBLASTS
TEETH PARODONTIUM
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Dentine tubulesTomes fibersNaumann sheath /sheet/
TEETH PARODONTIUM
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Hypersensitive area Hyposensitive area
TEETH PARODONTIUM
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Mantle dentineIntermingling processesgranular
Circumpulpal dentinematrix rich
Interdentine interglobular
Predentinematrix poor
odontoblasts
Dentine structure
External coatMantle dentine
10-30um; contains alfa-fibrills
Inner dentineCircumpulpal dentine
Stripped; exhibits regular secretion and mineralization layers
PredentineAmorphous; area of synthesis; polymorphous, contains proteoglycans, tropocollagen, glycoproteins
TEETH PARODONTIUM
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Neonatal line
Incremental lines(associated with dentine maturation) Von EbnerAdresenNeonatalRelation between primary and secondary dentine
Mineralizing in birth
TEETH PARODONTIUM
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Cementum = substantia ossea
• Thin layer on theroot
• Similar to thespongy bone
• Cellular part –cementocytes
TEETH PARODONTIUM
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CementumCementoblasts, mucoprotein substance, fibers
Cellulare:Collagen fibers + intercellulare substance + cementocytes
Non cellulare:Collagen fibers + intercellular substance
TEETH PARODONTIUM
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Relation between cementum, dentine and enamel
TEETH PARODONTIUM
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cellular
acelular
Acellular cementum - arrangement
TEETH PARODONTIUM
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Cellular cementum - structure
TEETH PARODONTIUM
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Hypercementosis
TEETH PARODONTIUM
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Pulp
fibroblasts
ramification
• Odontoblasts,• Weil subodontoblastic layer• Layer rich by nuclei
Pulpocytes (mesenchymal cells, fibrocytes)basic substance (collagen fibers, sugars, elastic fibers)free cells (histiocytes, monocytes, plasmatic cells)
TEETH PARODONTIUM
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TEETH PARODONTIUM
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TEETH PARODONTIUM
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Raschkow´plexus
Nerve fiberswith vesels
Cell contacts
Bipolar pulpocyte
TEETH PARODONTIUM
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Epitelové ostrůvky Malassez´epithelial islets
Hertwig´ epithelial sheet
Louis-Charles Malassez (1842-1909), frc. vědecOscar Hertwig (1849- 1922) něm. zoolog a anatom
TEETH PARODONTIUM
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Teeth: Vascular and nervous supply
n.V/2 br.alveolares sup. post.br.alveolares sup. ant.
n.V/3 n. alveolaris inf.
plexus dent. (sup., inf.)br. dentales, gingivales
aa. alveolares sup. post.aa. alveolares sup. ant.a. alveolaris inf.
vv. – follow arteries to the pterygoid plexus
lnodi. submandibulares (x M3)
TEETH PARODONTIUM
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Functionof the Tooth
fixationsystem
Tooth fixation, elasticity, (hydroelasticcushion) nutrition, asistance duringeruption
0.3-0.5
0.1-0.2
About 0.2 mm
TEETH PARODONTIUM
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TEETH PARODONTIUM
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Periodontium(suspensory system)
Cementum, Lamina corticalisLigg. periodontalia Gingiva (Mucoperiosteum)Cells, fibers, nerves, matrix, plasma, vessels, “hydroelastic pillow“
TEETH PARODONTIUM
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PARODONTIUM Periodontium
TEETH PARODONTIUM
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Gingiva proper (attached) =
pink, stippled, keratizing
Alveolar mucosa (“loose gingiva“) =
shiny red, nonkeratizing
Gingiva = fibrous tissue + mucous membraneFree: Interdental; embrasured; circumdentalAttached: Adjacent,fixed
TEETH PARODONTIUM
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Sulcus gingivae
Paramarginal sulcus
Gingiva = relation to the teeth – “cuff (collar) attachment“
TEETH PARODONTIUM
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Gum = Gingiva• Non-keratinized
epithelium -parakeratosis
• Multilayered epithelium
• Gingival groove• Junctional epithelium
– gingivodental junction / closure
TEETH PARODONTIUM
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Interdental, circumdental, dentoalveolar, interalveolarligaments
Ligamentous slings and circles help to tight attachment between gingiva and tooth
TEETH PARODONTIUM
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Upper dental arch –parabolic curve
Lower dental arch –hyperbolic curve
TEETH PARODONTIUM
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Arches
parabolic
hyperbolic
TEETH PARODONTIUM
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Exchange of ionts between external environment and pulpTEETH
PARODONTIUM
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TEETH PARODONTIUM
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True pocket
False pocket
TEETH PARODONTIUM
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compressionsucking
bite actions:
“tops on platform““tops on tops“
“combined“
TEETH PARODONTIUM
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I1I2
P2P1
M1
M3
M2 C
Normoocclusio Angle I
Edward Hartley Angle (June 1, 1855 - August 11, 1930) American dentist
TEETH PARODONTIUM
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frontal
lateral
TEETH PARODONTIUM
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Wilson curve
Spee curve
Monson
TEETH PARODONTIUM
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Teeth: Variations
and anomalies• Mesiodens• Paramolare• Tuberculum Carabelli• Divergency or convergency of roots • Root fusion• Dens in dente• Hyperplasia of teeth
TEETH PARODONTIUM
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TEETH PARODONTIUM
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TEETH PARODONTIUM
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Teeth as a whole complexmordex = dentition
• ortodental position (vertical axes of teeth)• articulation = occlusion
– 80% psalidodontia (scissor-like occlusion) = norm– progenia = lower teeth in front of the upper ones– (hiatodontia (= mordex apertus), stegodontia, prognathia,
opisthodontia)
TEETH PARODONTIUM
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TEETH PARODONTIUM
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Anodontia;
hypodontia;
diastema
Abnormality tvaru a polohy; Tooth abnormalities in
shape and position;
Gingivitis
TEETH PARODONTIUM
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Bodily shift
Mesial shift
Resorbtion-
Apposition+
TEETH PARODONTIUM
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“to palate““to tongue“
“wedge from“
“contact form“
AbrasionVII classes
TEETH PARODONTIUM
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TEETH PARODONTIUM
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TEETH PARODONTIUM
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Tooth development
• week 6 development of the dental lamina (dental molding)– Thick epithelium
inside oralmucous membrane
• Each molding has about 10 center of the proliferations– Dental buds
TEETH PARODONTIUM
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Tooth developmental stages• Dental bud
– Local thick epithelium, 10 in each jaw
• Dental cap– Ectoderm part → enamel organ– Invagination of the mesenchyme → dental papilla
week 8
TEETH PARODONTIUM
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• Dental bud (hat) → bell– External dental organ– Dental reticulum– Inner dental organ– Dental papilla → dental pulp– Dentl sac → cementum, periodontal ligaments
Tooth developmental stages
week 8
TEETH PARODONTIUM
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TEETH PARODONTIUM
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• Epithelial dental sheath (cervical sling)– Area of the contact between
inner and outer enamelic epithelium
– Ingrowth to the mesenchyme; root induction
Tooth developmental stages
month 3
TEETH PARODONTIUM
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TEETH PARODONTIUM
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TEETH PARODONTIUM
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Tooth developmental stages
123
456
Outer layer of the enamel organEnamel pulpInner layer of the enamel organ(ameloblasts)EnamelDentinOdontoblasts
TEETH PARODONTIUM
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TEETH PARODONTIUM
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month 6
TEETH PARODONTIUM
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TEETH PARODONTIUM
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Eruptio -eruption
Teeth appear in jaws as buds in the dental lamina
Tooth penetrates through gingiva to the oral cavity
Deciduous teeth – from month 6. to year 2
i1 i2 m1 c m2
Permanent teeth – from year 6. to year 30
M1 I1 I2 P1 C P2 M2M3
TEETH PARODONTIUM
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Examination pictures - examples
TEETH PARODONTIUM