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Structures of teethSuruedee Chinthakanan
Oral biology and Oral diagnostic sciences department
Outline • Position of teeth
• Blood supply
• Nerve supply
• Structures of teeth
• Periodontium
Position of teeth
www.salisburyhouseclinic.co.uk
Position of teeth
client.myoptumhealth.com skullanatomy.info
Position of teeth
en.wikipedia.org
Maxilla
Mandiblewww.nlm.nih.gov
Position of teeth
www.toothclub.gov.hk
• Incisors
• Canines
• Molars
Midsagittal plane
I:C:M = 2:1:2
Position of teeth
• Incisors
• Canines
• Premolars
• Molars
www.toothclub.gov.hk
I:C:P:M = 2:1:2:3
www.oralanswers.comwww.identalhub.com
Succedaneous & Nonsuccedaneous tooth
Ten Cate R., 2013
Succedaneous tooth
“A permanent tooth that succeeds
an exfoliated deciduous tooth”
Drake R.L., 2010
External carotid artery
Blood supply
Blood supply : max. teeth
Drake R.L., 2010
Ant.sup.alveolar a.
Post.sup.alveolar a.
Maxillary artery
Blood supply
Drake R.L., 2010
Inferior alveolar artery
External carotid artery
Drake R.L., 2010
External jugular vein
Blood supplyMaxillary vein
Pterygoid plexus
Nerve supply
Drake R.L., 2010
Trigeminal nerve
Maxillary nerve
Ant. Sup. Alveolar n.
middle Sup. Alveolar n.
Post. Sup. Alveolar n.
Foramen rotundum
Nerve supply
Drake R.L., 2010
Mandibular nerve
Inferior Alveolar n.
Trigeminal nerve
Innervation
Drake R.L., 2010
Lymphatic drainage• Submandibular nodes
• Submental nodes
• Deep cervical nodes
Drake R.L., 2010
Oral cavity
Drake R.L., 2010
Oral cavity
• Teeth
• Bones
• Supporting tissues of the tooth
• Oral mucosa
• Salivary glands
Teeth
expertbeacon.com
Structures of teeth
• Enamel
• Dentin
• Dental Pulp
• Cementum
en.wikipedia.org
Enamel
• covering for the crown of the teeth
• most highly mineralized tissue in the body
• Ameloblasts : enamel formation
• nonvital and insensitive matrix
• cannot be replaced or regenerated
en.wikipedia.org
Enamel
• Inorganic material : 96%
• Hydroxyapatite crystals
• Organic material : 1%
• Soluble & non-soluble protein
• Water : 3%
Enamel 2.5mm
• Most thickness at cusp/ incisal edge• Less thickness at Cervical line
Enamel
Reduced thickness in aging Translucent
light yellow to gray-white
Structures of teeth
• Enamel
• Dentin
• Dental Pulp
• Cementum
en.wikipedia.org
Dentin
• the bulk of the tooth
• bonelike matrix characterized
• dentinal tubules
• Odontoblasts: dentin formation
en.wikipedia.org
Dentin
Dentinal
Tubule
Odontoblastic
process
http://tuberose.com/Graphics/DentinalTubules.jpg
Ten Cate R., 2013
Dentin• Inorganic material : 70%
• Hydroxyapatite crystals
• Organic material : 20%
• 90% : Collagen (mainly type I)
• Non-collagenous matrix protiens and lipids
• Water : 10%
Dentin
• Hardness
• Support enamel
• elasticity provides flexibility and prevents fracture of the overlying brittle enamel.
Enamel Dentin Bone
sites.google.com
Dentin
More yellow in Aging
Dentin
Discoloration of dentinin tooth with pulp disease
Dentin
• Primary dentin• Most of the tooth
• Circumpulpal dentin(outlines the pulp chamber )
• Secondary dentin• Less regular tubular structure than 10 dentin
• Tertiary dentin• Reactive or Reparative dentin
• Reaction to various stimuli
Ten Cate R., 2013
Junction : DEJ -- CDJ
dentin
cementum
CDJCementodentinjunction en.wikipedia.org
DEJDentinoenameljunction
Structures of teeth
• Enamel
• Dentin
• Dental Pulp
• Cementum
en.wikipedia.org
Dental pulp
• soft connective tissue : supports the dentin
• principal cells : Odontoblasts, Fibroblasts, etc.
• Collagen fiber
• Blood supply
• Nerve supply
en.wikipedia.org
www.juniordentist.com
Dental Pulp
• Generate Dentin surround Dental Pulp
• secondary and tertiary Dentin
• Circulation
• Tooth sensation
• Temperature
• Pain
en.wikipedia.org
Pulp cavity
• Pulp chamber
• Root canal
• Apical foramen
Pulp chamber
Root canal
Apical foramen
CEJ
what-when-how.com
Pulp cavity
http://what-when-how.com/dental-anatomy-physiology-and-occlusion
Pulp chamber
Root canal
Apical foramen
studydroid.com
Pulpal floor
Dental pulp
• Soft C.T. contained in pulp cavity
• Coronal pulp
• Radicular pulp
• Pulpal horn Coronal pulp
Radicular pulp
Pulpal horn
CEJ
what-when-how.com
Dental pulp
bdsinsights.blogspot.com
Coronal pulp
Radicular pulp
Pulpal horn
studydroid.com
Pulpal floor
Structures of teeth
• Enamel
• Dentin
• Dental Pulp
• Cementum
en.wikipedia.org
Cementum
• Cover overall root surface
• Light yellow color
• Most thickness at root tip
Ten Cate R., 2013
Cementum
• Similar to bone
• Inorganic material : 45-50%
• Hydroxyapatite crystals
• Organic material : 50%
• Collagen (mainly type I)
• Noncollagenous matrix protiens
Cementum
www.kck.usm.my
• Two types of cementum
• Cellular cementum
• Acellular cementum
• Hardness
Enamel Dentin cementum
CEJ
Cementoenameljunction
Ten Cate R., 2013
Tooth supporting structures
• Periodontal ligament
• Alveolar bone
• Gingiva
Ten Cate R., 2013
Mineral in hard tissues
Hard tissue Hydroxyapatite
Enamel > 90%
Dentin 67%
Cementum 45% to50%
Bone 50% to60%
Periodontal ligament
• PDL space 0.15-0.38 mm
• Collagen fiber
• Gel-like incompressible matrix
• receptor
Ten Cate R., 2013
Alveolar bone
• Surrounding bone
• Attachment of PDL
• Root like shape
• Resorption after extraction
Alveolar bone drramseyamin.typepad.com
www.lookfordiagnosis.com
Gingiva
• Soft tissue cover alveolar bone
• Unstable position
• Not fully-eruption
• Gingival enlargement
• Gingival recession / Bone resorption
Gingiva
http://www.oralhealthnet.co.uk/detail/3/gum-recession/
http://img.medscape.com/pi/emed/ckb/dermatology/1048885-1079711-1720.jpg
Anatomical aspect
Anatomical aspect
• Crown
• Anatomical crown
• Clinical crown
• Root
• Anatomical root
• Clinical root
www.dentistrytoday.com
CEJ
“Cementoenamel junction/cervical line”
Anatomical aspect
• Crown
• Anatomical crown
• Clinical crown
• Root
• Anatomical root
• Clinical root
www.hungariandentalcare.nl
Crown:Root
Anatomical Crown
Anatomical Root
Clinical Crown
Clinical Root
CEJ
Conclusion
Position of teeth
• Maxilla
• Mandible
en.wikipedia.org
Conclusion • Structures of teeth
• Enamel ; Dentin ; Dental pulp ; Cementum
• Tooth supporting structures
• PDL ; Alveolar bone ; Gingiva
• Blood and nerve supply
Mineral in hard tissuesHard tissue Hydroxyapatite
Enamel > 90%
Dentin 67%
Cementum 45% to50%
Bone 50% to60%
Enamel Dentin Bone cementum
References1.Anne M.R. Agur : Grant’s atlas of anatomy, 9thed. Williams&Wilkins, A waverly company, 1991.
2.Ash M. Major, Nelson J. Stanley : Wheeler’s Dental Anatomy, Physiology, and Occlusion, 8thed. Saunders, Saint Louis,Missouri,1993.
3.Ben Pansky : Review of Gross Anatomy, 6thed. McGraw-Hill, Health professions Division, 1996.
4.Klaus H., Edith M. Rateitschak, Herbert F. Wolf, Thomas M. Hassell : Color Atlas of Dental Medicine 1 Periodontology, 2nd ed. Thieme Medical Publishers, Inc., New york, 1989.
5.Richard Ten Cate, et. al : Oral histology, development, structure and function, 5thed. Saint Louis, C.V. Mosby, 8th ed, 2013.
6.Robert C. Zeisz, James Nuckolls : Dental Anatomy, The Form and Function. Henry Kimpton, 25 Bloomsbury Way, W.C.1, London, 1949.
7.Nelson SJ. Wheeler's dental anatomy, physiology, and occlusion. 10th ed. St. Louis: Elsevier; 2016:1-19. 2.
8. ชชัรี สชุาติล ้าพงศ,์บรรณาธิการ: ต าราทนัตกายวิภาคศาสตร์ประยกตุ,์ พิมพค์ร้ังท่ี 1 กรุงเทพมหานคร: บณัฑิตดีไซน;์ 2535
www.stephensdentistry.com
Any questions??
www.sodahead.com
thethingsilearnedfrom.com
Thank you
very much
s.chinthakanan@gmail.com
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