Regressive and Traumatic Alterations of Teeth - PowerPoint PPT Presentation

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Regressive and Traumatic Alterations of Teeth

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  1. Regressive and Traumatic Alterations of Teeth Unit 4

  2. Regressive Alteration • Attrition • Abrasion • Erosion

  3. Attrition • Physiologic wearing away • Incisal, occlusal and interproximal surfaces • Part of aging process • Bruxism – pathologic attrition

  4. Attrition – Radiologic Features • Change in normal outline • Flat occlusal plane • Loss of mamelon • Pulp chamber, canal size • Hypercementosis

  5. Attrition

  6. Attrition

  7. Abrasion • Non-physiologic wearing away • Habits • Toothbrush trauma • Dental floss injury • Occupational hazards

  8. Abrasion – Radiologic Features • Radiolucent defects at the cervical region • Well-defined semilunar defects • Pulp chambers sclerosed • In case of dental floss injury, distal surfaces more involved

  9. You will write cases today • Describe • Type of film(s) • Location / number of lesions (problem) • Size • Shape • Border • Content • Effects on neighboring structures

  10. Case 1 for write-up

  11. March 2000 May 2003

  12. Erosion • Chemical cause • No bacteria involved • Diet • Regurgitation • Occupational hazards

  13. Erosion - Radiologic Features • Radiolucent defects • Dietary acids – labial surface • Regurgitation – mandibular lingual surface • Occupational – all surfaces

  14. Resorption Phenomenon • External • Internal

  15. External Resorption • Periapical pathology • Trauma • Mechanical forces • Tumors and cysts • Impacted teeth • Osteosclerosis • Idiopathic

  16. Ext. Resorption: Periapical Path

  17. Ext. Resorption: Trauma

  18. Case for Brett Moore

  19. Ext. Resorption: Orthodontic

  20. Ext. Resorption: Tumors/cysts

  21. Ext. Resorption: Tumors/cysts

  22. Ext. Resorption:

  23. Ext. Resorption: Impacted Tooth

  24. Ext. Resorption: Impacted Tooth

  25. Ext. Resorption: Osteosclerosis

  26. Ext. Resorption: Idiopathic

  27. Case for Ruth Atterberg

  28. Internal Resorption • Trauma • Idiopathic

  29. Int. Resorption: Idiopathic

  30. Internal Resorption: Trauma

  31. Traumatic Injury to Teeth • Concussion • Luxation • Avulsion

  32. Concussion • No displacement or loosening • Crushing injury to adjoining areas • Early radiographic changes may be minimal • Widened PDL spaces: few days to weeks • Long term effects: pulpal sclerosis, necrosis, periapical lesions

  33. Luxation • Dislocation of teeth: intrusion, extrusion, lateral, lingual or buccal • Early radiographic observation: widened PDL spaces • Long term effect: pulpal sclerosis, necrosis, periapical lesion

  34. Avulsion • Loss of tooth • Socket outline • Fracture of alveolar bone • Possibility of reimplantation

  35. Fracture of Teeth • Coronal fracture • Cusp • Pulp • Root fracture • Horizontal • Vertical • (Details of fracture in Unit 11)