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School of Developmental Abnormalities of Teeth Zhang Qi Wuhan University School of Stomatology.

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Presentation on theme: "School of Developmental Abnormalities of Teeth Zhang Qi Wuhan University School of Stomatology."— Presentation transcript:

1 School of Developmental Abnormalities of Teeth Zhang Qi Wuhan University School of Stomatology

2 School ofClassification Anomalies of Number Anomalies of Size Anomalies of Shape Anomalies of Structure Anomalies of Color

3 School of Anomalies of Number 1.Anodontia: a complete absence of one or both dentition. 2. Hypodontia (partial anodontia): a deficiency in tooth number. 3.Hyperdontia (Supernumerary Teeth): an excess in tooth number. a. Mesiodens b. Distomolar

4 School of Mesiodens

5 School of Anomalies of Size 1.Microdontia 2.Macrodontia

6 School of Anomalies of Shape 1.Gemination 2.Fusion 3.Concrescence 4.Dilaceration 5.Enamel Pearl (enameloma) 6.Talon Cusp 7.Taurodontism 8.Dens in Dente (dens invaginatus) 9.Dens Evaginatus 10.Supernumerary Roots 11.Hypercementosis

7 School of Gemination The partial development of two teeth from a single tooth bud following incomplete division. An incomplete division of a single tooth bud resulting in a bifid crown with a single pulp chamber.

8 School of Gemination

9 School of The dentinal union of two embryologically developing teeth. Fused teeth can contain two separate pulp chamber, may appear as large bifid crowns with one chamber. Fusion

10 School of Fusion

11 School of An acquired disorder in which the roots of one or more teeth are united by cementun alone after formation of the crowns. Concrescence

12 School of Concrescence

13 School of GEMINATION FUSIONCONCRESCENCE One bud One tooth One canal Two buds Two teeth Dentin union Two buds Two teeth Cementum union

14 School of An extra cusp, usually in the central groove or ridge of a posterior tooth and lateral incisor. Dens Invaginatus

15 School of A condition resulting from the invagination of the inner enamel epithelium producing the appearance of a tooth within a tooth. Dens in Dente

16 School of Dens in Dente (dens invaginatus)

17 School of Taurodont teeth are characterized by having a significantly elongated pulp chamber with short stunted roots, resulting from the failure of the proper level of horizontal invagination of Hertwigs epithelial root sheath.. Taurodont

18 School of Taurodontism-bull like tooth

19 School of Dilaceration refers to an abnormal bend of the root during its development and is thought to result from a traumatic Episode. Dilaceration

20 School of

21 Anomalies of Structure 1.Enamel hypoplasia caused by amelogenesis imperfecta (genetic) 2.Enamel Hypoplasia caused by febrile Illness or Vitamin Deficiency 3.Enamel hypoplasia resulting from local infection or Trauma a. Turner's Tooth 4.Enamel hypoplasia resulting from fluoride Ingestion (dental fluorosis) a. Mottling

22 School of Anomalies of Structure 5.Enamel hypoplasia resulting from congenital syphilis (Treponema pallidum) a. Hutchinson's incisors b. Mulberry molars 6.Enamel hypoplasia resulting from birth injury, premature birth or idiopathic factors 7.Enamel hypocalcification 8.Dentinogenesis imperfecta 9.Dentin dysplasia 10. Regional Odontodysplasia (Ghost teeth)

23 School of Classification of AI Type I: hypoplastic TypeII: hypomaturation TypeIII: hypocalcified TypeIV: hypomaturation-hypoplastic with taurodontism Amelogenesis Imperfecta

24 School of Amelogenesis imperfecta

25 School of enamel hypoplasia

26 School of enamel hypoplasia

27 School of Turner Tooth

28 School of Dental fluorosis

29 School of Hutchinson teeth

30 School of Classification of DI Type I: occures with osteogenesis imperfecta TypeII: hereditary opalescent dentin TypeIII: Brandywine type a shell-like appearance and multipe pulp exposures. Dentinogenesis Imperfecta

31 School of Dentinogenesis imperfecta

32 School of

33 Anomalies of Color Discoloration of teeth Etiology Surface deposits (Extrinsic stains) Changes in structure or thickness of dental tissues Diffusion of pigments into dental tissues Pigments incorporated during formation of dental tissues.

34 School of Extrinsic stains Substances in the diet Habitual chewing, betel nut, tobacco Tobacco smoking Medicaments Chromogenic bacteria

35 School of Changes in structure Enamel hypoplasias, fluorosis Amelogenesis imperfecta, hypocalcified, hypomaturation, and hypoplastic types Enamel opacities Enamel caries Dentinogenesis imperfecta age changes in dental tissues

36 School of Diffusion of pigments Extrinsic stains Endodontic materials Products of pulp necrosis

37 School of Pigments incorporation Bile pigments Porphyrins Tetracycline

38 School of Tetracycline stained teeth

39 School of


41 Composite resin restoration

42 School of

43 Other disorders of teeth

44 School of Attrition

45 School of Erosion

46 School of Toothbrush abrasion

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