Regressive and Traumatic Alterations of Teeth

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Regressive and Traumatic Alterations of Teeth

• Unit 4

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Regressive Alteration

• Attrition
• Abrasion
• Erosion

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Attrition

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

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Attrition Radiologic Features

• Change in normal outline
• Flat occlusal plane
• Loss of mamelon
• Pulp chamber, canal size
• Hypercementosis

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Attrition
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Attrition
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Abrasion

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

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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

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You will write cases today

• Describe
• Type of film(s)
• Location / number of lesions (problem)
• Size
• Shape
• Border
• Content
• Effects on neighboring structures

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Case 1 for write-up
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March 2000
May 2003
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Erosion

• Chemical cause
• No bacteria involved
• Diet
• Regurgitation
• Occupational hazards

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Erosion - Radiologic Features

• Radiolucent defects
• Dietary acids labial surface
• Regurgitation mandibular lingual surface
• Occupational all surfaces

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Resorption Phenomenon

• External
• Internal

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External Resorption

• Periapical pathology
• Trauma
• Mechanical forces
• Tumors and cysts
• Impacted teeth
• Osteosclerosis
• Idiopathic

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Ext. Resorption Periapical Path
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Ext. Resorption Trauma
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Case for Brett Moore
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Ext. Resorption Orthodontic
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Ext. Resorption Tumors/cysts
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Ext. Resorption Tumors/cysts
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Ext. Resorption
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Ext. Resorption Impacted Tooth
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Ext. Resorption Impacted Tooth
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Ext. Resorption Osteosclerosis
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Ext. Resorption Idiopathic
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Case for Ruth Atterberg
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Internal Resorption

• Trauma
• Idiopathic

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Int. Resorption Idiopathic
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Internal Resorption Trauma
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Traumatic Injury to Teeth

• Concussion
• Luxation
• Avulsion

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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

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Luxation

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

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Avulsion

• Loss of tooth
• Socket outline
• Fracture of alveolar bone
• Possibility of reimplantation

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Fracture of Teeth

• Coronal fracture
• Cusp
• Pulp
• Root fracture
• Horizontal
• Vertical
• (Details of fracture in Unit 11)