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Developmental Abnormalities of Teeth

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Presentation on theme: "Developmental Abnormalities of Teeth"— Presentation transcript:

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

2 Classification Anomalies of Number Anomalies of Size
Anomalies of Shape Anomalies of Structure Anomalies of Color

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

4 Mesiodens Anadontia: a complete absence of one or both dentition.
Hypodontia: one or several teeth are missing. Hyperdontia: There are teeth additional to those of the the normal series.

5 Anomalies of Size Microdontia Macrodontia

6 Anomalies of Shape Gemination Fusion Concrescence Dilaceration
Enamel Pearl (enameloma) Talon Cusp Taurodontism Dens in Dente (dens invaginatus) Dens Evaginatus Supernumerary Roots 11.Hypercementosis

7 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 Gemination

9 Fusion 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.

10 Fusion

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

12 Concrescence

13 GEMINATION FUSION CONCRESCENCE One bud One tooth One canal Two buds Two teeth Dentin union Two buds Two teeth Cementum union

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

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

16 Dens in Dente (dens invaginatus)

17 Taurodont 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 Hertwig’s epithelial root sheath..

18 Taurodontism-bull like tooth
The dental chamber has a greater apico-occlusal height than in normal teeth, with no constriction at the level of the amelocemental junction with the result that the chamber extends apically well beyond the cervix. Taurodontism-bull like tooth

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

20 A deformity in which the crown of the tooth is displaced from its normal alignment with the root, so that the tooth is severely bent along its long axis. Dilaceration is usually the result of acute mechanical trauma and most frequently involves the maxillary incisor.

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

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

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

24 Amelogenesis imperfecta

25 enamel hypoplasia

26 enamel hypoplasia

27 Turner Tooth

28 Dental fluorosis

29 Hutchinson teeth

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

31 Dentinogenesis imperfecta


33 — Discoloration of teeth Etiology
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 Extrinsic stains Substances in the diet
Habitual chewing, betel nut, tobacco Tobacco smoking Medicaments Chromogenic bacteria

35 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 Diffusion of pigments Extrinsic stains Endodontic materials
Products of pulp necrosis

37 Pigments incorporation
Bile pigments Porphyrins Tetracycline

38 Tetracycline stained teeth



41 Composite resin restoration


43 Other disorders of teeth

44 Attrition

45 Erosion

46 Toothbrush abrasion

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