Presentation on theme: "Developmental Abnormalities of Teeth"— Presentation transcript:
1 Developmental Abnormalities of Teeth Zhang QiWuhan University School of Stomatology
2 Classification Anomalies of Number Anomalies of Size Anomalies of ShapeAnomalies of StructureAnomalies 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.
17 Taurodont Taurodont teeth are characterized by having a significantly elongated pulpchamber with short stunted roots,resulting from the failure of the properlevel of horizontal invagination ofHertwig’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 developmentand is thought to result from a traumaticEpisode.
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 byamelogenesis imperfecta (genetic)Enamel Hypoplasia caused byfebrile Illness or Vitamin DeficiencyEnamel hypoplasia resulting fromlocal infection or Traumaa. Turner's Toothfluoride Ingestion (dental fluorosis) a. Mottling
22 Anomalies of Structure Enamel hypoplasia resulting fromcongenital syphilis (Treponema pallidum)a. Hutchinson's incisors b. Mulberry molarsEnamel hypoplasia resulting from birth injury,premature birth or idiopathic factorsEnamel hypocalcificationDentinogenesis imperfectaDentin dysplasia10. Regional Odontodysplasia (Ghost teeth)
33 — Discoloration of teeth Etiology Anomalies of Color— Discoloration of teethEtiologySurface deposits (Extrinsic stains)Changes in structure or thickness of dental tissuesDiffusion of pigments into dental tissuesPigments incorporated during formation of dental tissues.
34 Extrinsic stains Substances in the diet Habitual chewing, betel nut, tobaccoTobacco smokingMedicamentsChromogenic bacteria
35 Changes in structure Enamel hypoplasias, fluorosis Amelogenesis imperfecta, hypocalcified,hypomaturation, and hypoplastic typesEnamel opacitiesEnamel cariesDentinogenesis imperfectaage changes in dental tissues
36 Diffusion of pigments Extrinsic stains Endodontic materials Products of pulp necrosis
37 Pigments incorporation Bile pigmentsPorphyrinsTetracycline