Morphology Primary Dentition

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Morphology Primary Dentition
2011-10-28 12:55:21
Morphology Primary Dentition

Morphology Primary Dentition
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  1. ´╗┐Primary teeth roles
    • Mastication
    • Speech and proper pronunciation
    • Self-esteem and esthetics
    • Health of permanent teeth
    • Space maintenance for permanent teeth
  2. Eruption Sequence
  3. Turner tooth
    • Focal enamel hypoplasia
    • Hypoplasia is the underdevelopment or incomplete development of a tissue or organ
    • Results from localized inflammation or trauma during tooth development
    • Most likely, the primary tooth was heavily decayed and an area of inflamed tissues around the root of the tooth (called a periapical inflammation), affecting the development of the permanent tooth.
  4. Primary dentition period:
    • ONLY primary teeth present
    • 6 months to 6 years
  5. Mixed dentition period:
    • Both primary and permanent teeth are present
    • 6 years to 12 years
  6. Exfoliation Sequence
  7. Permanent dentition period:
    After the last primary tooth exfoliates
  8. Primary vs Permanent Crowns
    • Smaller in size
    • Whiter enamel Due to increased opacity
    • Broad, flat contacts
    • Prominent cervical bulge
    • Smaller crown-to-root ratio than permanent teeth
    • Short crown in relation to total length of tooth
    • Crowns are narrower (constricted) at the CEJ
    • Thinner, even layers of enamel and dentin
    • Enamel rods in gingival 1/3 extend occlusally from the DEJ
  9. Enamel rods
    • The crystalline structural unit of enamel
    • Most enamel rods extend the width of the enamel from DEJ to outer surface
    • In primary teeth:
    • Enamel rods in gingival 1/3 extend occlusally from the DEJ
    • In permanent teeth:
    • Enamel rods in gingival 1/3 extend gingivally from the DEJ
  10. Primary Roots vs Permanent
    • Narrower
    • Longer in relation to their crown
    • Widely divergent
    • Short root trunks
  11. Primary Pulp vs. Permanent
    • Larger pulp horns and pulp chambers in relation to the crown
    • Pulp horns are closer to outer surface of tooth
    • Especially mesial pulp horns of molars
  12. Primary Maxillary Central Incisors
    • E,F
    • Wider mesiodistally than incisocervically
    • ONLY anterior tooth of either arch with these dimensions
    • No mamelons, leaving the labial surface smooth
    • Cingulum & marginal ridges more prominent than on permanent central
  13. Primary Lateral Incisor
    • D,G
    • Smaller than central in all dimensions
    • Longer incisocervically then mesiodistally
  14. Primary Central Incisors:
    • O,P
    • Very symmetrical
    • Incisal edge centered over the root from proximal and incisal views
    • Lingual surface smooth and tapers toward prominent cingulum
  15. Primary Lateral Incisors:
    • N,Q
    • Wider and longer with a more developed cingulum than the central
    • Incisal edge slopes distally
    • Cingulum offset to the distal
  16. Primary Maxillary Canine
    • C,H (canines have More Root)
    • Mesial cusp slope longer than distal cusp slope
    • OPPOSITE of the other primary and permanent canines
    • Cusp tip offset to distal
    • Well developed cingulum, marginal ridges and lingual ridge
  17. Primary Mandibular Canine
    • M,R
    • Distal cusp slope longer than mesial cusp slope
    • Much smaller labiolingually than maxillary canine
    • Smooth lingual surface with shallow lingual fossa
  18. Primary Maxillary 1st Molar
    • B,I
    • Resembles the shape of a premolar
    • Four cusps (MB & ML > DB & DL)
    • Prominent transverse ridge
    • Prominent buccal cervical ridge
    • 3 roots (MB, DB, Palatal)
  19. Primary Maxillary 2nd Molar
    • A,J
    • Resembles the permanent maxillary first molar, but smaller in all dimensions
    • Usually has cusp of Carabelli
    • Larger than primary first molar
    • 3 roots (MB, DB, Palatal)
  20. Primary Mandibular 1st Molar
    • L,S
    • Unlike ANY OTHER tooth in the primary OR permanent dentition
    • Prominent buccal cervical ridge
    • 4 cusps (MB & DB > ML & DL)
    • Transverse ridge between MB & ML
  21. Primary Mandibular 2nd Molar
    • K,T
    • Resembles the permanent mandibular first molar
    • 5 cusps But, the three buccal cusps are
    • nearly equal in size
  22. Eruption Sequence
    • Normally, no teeth present at birth
    • If present, called natal teeth. 90% are primary; 10% are supernumerary
    • First primary tooth to erupt is mandibular central
    • 6 month variation normal
    • Investigate any asymmetry
    • Sequence:
    • cental -> lateral -> 1st molar -> canine -> 2nd molar
  23. Root Resorption
    • is the breakdown or destruction, and subsequent loss, of the root structure of a tooth. This is caused by living body cells attacking part of the tooth
    • Deciduous root resorption is a natural process which allows exfoliation of the primary teeth to make way for the secondary teeth. Deciduous root resorption is caused by osteoclast differentiation due to pressure exerted by the erupting permanent tooth.
    • The root resorption process is regulated in a manner similar to bone remodeling
    • Appears to be initiated and regulated by:
    • Stellate reticulum-Dental follicle of the underlying permanent tooth
  24. Permanent Eruption Trends
    • In general, mandibular teeth erupt before maxillary counterpart
    • First molars are first permanent teeth to erupt
    • Central incisors are first succedaneous teeth to erupt
    • Note the late eruption of the maxillary canine
    • Could be impacted due to space loss
  25. succedaneous
    Permanent tooth that replaces a primary tooth
  26. Knocked out tooth
    • Immediate reimplantation is essential!
    • Option 1: Reimplant tooth into the socket themselves and go to the dentist ASAP
    • ONLY touch the crown, not the root
    • Gently rinse with water if dirty
    • Option 2: See a dentist within the next 30 minutes (golden window)
    • Store tooth in “EMT Tooth Saver”, cold milk, saline or saliva, but NOT water