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TOOTH dens, dentis odus, odonotos. Teeth (Dentes) arcus dentalis superior (maxillaris) – ellipse arcus dentalis inferior (mandibularis) – parabola permanent.

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Presentation on theme: "TOOTH dens, dentis odus, odonotos. Teeth (Dentes) arcus dentalis superior (maxillaris) – ellipse arcus dentalis inferior (mandibularis) – parabola permanent."— Presentation transcript:

1 TOOTH dens, dentis odus, odonotos

2 Teeth (Dentes) arcus dentalis superior (maxillaris) – ellipse arcus dentalis inferior (mandibularis) – parabola permanent teeth (dentes permanentes) – 32 deciduous teeth (dentes decidui) – 20 dens incisivus (= incisor tooth) 8/8 dens caninus (= canine tooth) 4/4 dens premolaris (= premolar tooth) 8/0 dens molaris (= molar tooth) 12/8

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4 Teeth – parts crown (corona) neck (cervix) root (radix) pulp (pulpa)

5 Surfaces and directions occlusalis vestibularis (buccalis/labialis) lingualis (lower teeth) palatinalis (upper teeth) mesialis distalis

6 Teeth – fixation gomphosis (socket) = dentoalveolar joint located in bony alveolus dentalis of jaw periodontium parodontium = all structures around tooth

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8 between tooth and dental alveolus (fixed to the bone of alveolus) collagen fibers (serve as alveolar periosteum) fixation apparatus of tooth = fibers of various directions penetrates into cement rapid change of connective tissue, plasticity – orthodontics atrophy in lack of proteins and vitamin C → scurvy (= skorbut)Peridontium

9 Periodontium

10 Scurvy (scorbut)

11 Macroscopy of tooth and its fixation

12 Denture as a whole mordex = denture orthodental position – teeth vertically occlusion (occlusio) 80 % psalidodontia (scissors-like occlusion) = norm –progenia = lower jaw longer (lower teeth in front of upper ones) –stegodontia = roof-like occlusion –prognathia = upper jaw longer (upper teeth in front of lower ones) –opisthodontia = lower teeth too far behind upper ones –hiatodontia (= mordex apertus)

13 Dental chart / scheme crossed with letters –tooth number designed with lower INDEX –lowercase = decicuous –UPPERCASE = PERMANENT crossed with numbers –Roman numerals = decicuous –Arabic numerals = PERMANENT

14 Dental chart / scheme of deciduous teeth Dental chart / scheme of permanent teeth

15 Dental chart / scheme binumeral (Féderation Dentaire Internationale) –1-4 quadrants (from right side above clock-wise) = PERMANENT –5-8 (similar) = deciduous numeral (American Dental Association) –numerals 1-32 (from right upper third mollar clock-wise) = PERMANENT –letters A-T (similar from right upper second molar) = deciduous

16 Teeth – structure dentine – dentinum (substantia eburnea) enamel – enamelum (substantia adamantina) cement – cementum (substantia ossea) pulp – pulpa –loose connective tissue, vessels, nerves

17 Enamel hardest tissue of body organic part –secreted by ameloblasts (enameloblastus) –glycoproteins (amelogenins, enamelins) anorganic part 95% –hydroxyapatite arranged vertically in prisms (rods) in between interprismatic substance

18 Fluoridation fluorine is sired under the enamel surface, posteruptivelly from saliva and tooth-paste re-covers defects fluorapatite is more resistant to acids (Ph 4,5) and is produced more quickly than hydroxyapatite (pH 5,5) the more fluorapatite is in enamel, the more resistant to dental caries (tooth decay) supplement: tooth-paste, salt, at dentist

19 Dentine calcified connective tissue organic part –collagen I, proteoglycans –secreted by odontoblasts (dentinoblastus) located on internal surface of dentine Tomes fibers (fibrae dentinales) anorganic part –hydroxyapatite non-calcified dentine predentine close to enamel and cement

20 Pulp loose connective tissue –fibroblasts –immune cells soustavy vessels nerve fibers (senstitive to pain)

21 Cement thin layer at neck thick layer at root fibrilar type of bone cellular part – cementocytes

22 Gum (Gingiva) mucosa attached to periosteum stratified nonkeratinizing squamous epithelium papilla gingivalis no glands no submucosa gingivodental junction

23 Gum (Gingiva) linea mucogingivalis gingiva alveolaris (pars affixa gingivae) –pink, stippled, keratizing „free gingival groove“ gingiva marginalis (pars libera gingivae) –shiny, red, nonkeratinizing sulcus gingivalis junctio dentogingivalis epithelium junctionale

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25 Teeth development (Odontogenesis) ectomesenchyme oral ectoderm mesoderm cells of neural crest enamel is derived from ectoderm other tissues are derived from ectomesenchyme

26 Teeth development Week 6: lamina dentalis (dental lamina) appears –thickening of stomodeum epithelium in each lamina 10 proliferation centers –dental buds

27 Stages of tooth development dental bud (status gemmalis) –local thickening of epithelium, 10 in each jaw dental cap (status galearis) –ectodermal part → enamel organ (organum enameleum) –invagination of mesenchyme → dental papilla

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29 Stages of tooth development dental cap → dental bell (status campanalis) –outer dental epithelium –enamel reticulum –inner dental epithelium –dental papilla → dental pulp –dental sac → cement, periodontal ligaments

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31 Stages of tooth development – bell odontoblasts (dentinoblasti) –derived from mesenchyme cells at inner enamel organ –produce (pre)dentine –Tomes fibers (fibrae dentinales) cytoplasmatic processes left within dentine

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33 Stages of tooth development – bell ameloblasts (enameloblasti) –from inner enamel epithelium –basal surface becomes secretory –production of enamel

34 Stages of tooth development – bell epithelial root sheath (vagina epithelialis radicis) = Hertwig sheath –transition between outer and inner enamel epithelium –ingrowth into mesenchyme and induction of root formation

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36 Tooth eruption decidual teeth: 6th – 24th month enamel organ disrupted during tooth eruption

37 Permanent teeth develop similarily to decidual teeth secondary dental lamina –located at lingual side of dental lamina –prolonged distally (molars) eruption from 6th year (finished in 30th – 40th year)

38 Clinical note tetracycline antibiotics are contraindicated in children up to 8 years of age, pregnant and nursing women –high affinity to newly produced enamel –brown-yellow color –enamel hypoplasia

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