abrasion

pathologic wearing away
abnormal mechanical process

abrasion is the [?] of tooth substance through some [?]

exposed root surfaces
incisal or proximal surfaces

abrasion usually occurs on the [?], but under certain circumstances may also be seen on the [?]

1. V-shaped or wedge-shaped ditch on the root side of CEJ

2. angle formed at the side of the lesion is sharp

3. exposed dentin appears slightly polished

4. most common on the left side of right handed people

5. exposure to dentinal tubules and consequent irritation of the odontoblastic process may stimulate formation of secondary dentin

6. Secondary dentin formation protects the tooth against pulp exposure

clinical features of abrasion

dentinal tubules

microscopic tube within dentin that spreads outward from tooth centre

1. use of abrasive dentifrice is the most common cause of root abrasion

2. improper toothbrushing (use of toothbrush in horizontal direction)

3. habitual opening of bobby pins may result to notching of incisal edge

etiology of abrasion

correct the faulty habit

treatment of abrasion