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DENTAL ANATOMY 1st Semester 2008/2009 Academic Year Department of Stomatology

DENTAL ANATOMY 1st Semester 2008/2009 Academic Year Department of Stomatology School of Stomatology Wenzhou Medical College. Primary (and Mixed) Dentition. Kevin Yang Li Hong-qing. SECTION 1 Background Info. Objectives Dental formulae Functions of primary dentition. A definitions.

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DENTAL ANATOMY 1st Semester 2008/2009 Academic Year Department of Stomatology

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  1. DENTAL ANATOMY 1st Semester 2008/2009 Academic Year Department of Stomatology School of Stomatology Wenzhou Medical College

  2. Primary (and Mixed) Dentition Kevin Yang Li Hong-qing

  3. SECTION 1 Background Info. • Objectives • Dental formulae • Functions of primary dentition

  4. A definitions • Deciduous teeth • Deciduous: fall off • Primary teeth • Nicknames • Milk teeth • Temporary teeth

  5. B Dental formulae • Primary teeth • I2/2+C1/1+M2/2=5/5 • Permanent teeth • I2/2+C1/1+P2/2+M3/3=8/8

  6. Teeth numbering • A to T

  7. 1D to 20D

  8. C functions • Mastication of food

  9. Support the cheeks and lips

  10. Speech formulation

  11. Maintaining the space and arch continuity

  12. SECTION 2 Developmental Data • Objective • Time ranges for primary and secondary tooth eruption • Time ranges crown and root formation for primary and secondary teeth • Oder of eruption of primary and secondary teeth

  13. A important times for tooth emergence • No teeth • Birth 6(or8) months old: • Primary dentition only • 6(or8) months-2(or21/2)old: • 2(or21/2)-6(or53/4)years old:

  14. Mixed dentition • 6(or53/4)years old: • 6-9years old: • 9-12years old: • 12years old: • Adult dentition only • 17-21 years old:

  15. B crown and root development • General development • primary teeth: Lobes- crown calcifications- root formation, tooth eruption process- resorption- exfoliation • Succedaneous teeth: Lobes- crown calcifications- root formation, tooth eruption process

  16. Average primary crown calcification time? • When does root formation begin? • When does tooth start to erupt? • How long does the eruption process last? • Order of emergence of primary teeth? • When do the primary tooth roots are completed? • What’s Mixed dentition? Age of mixed dentition? • Age of crown formation of 2nd teeth? • Oder of emergence for 2nd teeth? • 1st and last emergence tooth of 2nd teeth?

  17. SECTION 3 Dentition traits of all primary teeth • Specimens • The best: in kids mouth • Or: plastic model

  18. General traits compared to secondary teeth • Smaller in size • Whiter • Marked constriction at cervix • Relative longer roots • Large pulp cavity, thin enamel and dentin layer • Less mineralized • More consistent shape

  19. Traits of all primary anterior teeth • Cervical ridges on facial surfaces are prominent • Lingual cingula are prominent • Labial surfaces are smooth

  20. Root traits of primary teeth • Long to the crown • Narrow mesiodistally • Roots bend labially

  21. Traits of primary posterior teeth • Prominent cervical ridge • Narrow occlusal table

  22. Buccal view: wide mesiodistally • Shallow occlusal anotomy

  23. Few grooves or depressions • Primary second molar larger than primary first molar

  24. Root traits of primary teeth • Root furcation near the crown, little or no trunk • Roots are thin or slender • Root number and relative size

  25. SECTION 4 Class and Type Traits • Primary incisor traits • Primary canine traits • Primary molar traits

  26. SECTION 5 pulp cavity • Anterior teeth • Large pulp cavity • Slight projection • Posterior teeth (molars) • Chamber Less elongated vertically • Pulp chamber in root crown • Long, narrow pulp horns

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