Attrition
• Physiologic wearing away
• Incisal, occlusal and interproximal surfaces
• Part of aging process
• Bruxism – pathologic attrition
Attrition – Radiologic Features
• Change in normal outline
• Flat occlusal plane
• Loss of mamelon
• Pulp chamber, canal size
• Hypercementosis
Abrasion
• Non-physiologic wearing away
• Habits
• Toothbrush trauma
• Dental floss injury
• Occupational hazards
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
You will write cases today
• Describe– Type of film(s)– Location / number of lesions (problem)– Size– Shape– Border– Content– Effects on neighboring structures
Erosion - Radiologic Features
• Radiolucent defects
• Dietary acids – labial surface
• Regurgitation – mandibular lingual surface
• Occupational – all surfaces
External Resorption
• Periapical pathology
• Trauma
• Mechanical forces
• Tumors and cysts
• Impacted teeth
• Osteosclerosis
• Idiopathic
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
Luxation
• Dislocation of teeth: intrusion, extrusion, lateral, lingual or buccal
• Early radiographic observation: widened PDL spaces
• Long term effect: pulpal sclerosis, necrosis, periapical lesion
Avulsion
• Loss of tooth
• Socket outline
• Fracture of alveolar bone
• Possibility of reimplantation