Regressive Alteration of Teeth

Question 1

Attrition

Answer 1

loss of tooth structure occlusally and interproximally due to direct

tooth to tooth contact.

Physiological or pathological.

Ex. Bruxism

Question 2

Abrasion

Answer 2

loss of tooth structure from mechanical habit.

Ex. Cervical abrasion

Question 3

Erosion

(Perimylosys)

Answer 3

loss of tooth structure from chemical process, most often non-bacterial acid dissolution.

Belimena is a common cause

• Perimylosys: erosion due to exposure to gastric secretions.

Question 4

Abfraction

Answer 4

loss of tooth structure due to repeated tooth flexture caused by

occlusal stress.

Question 5

Demastication

Answer 5

combined effect of attrition and abrasion.

Ex. Chewing tobacco between opposing teeth

Question 6

Secondary dentin

Answer 6

physiologic deposition of dentin throughout life.

Question 7

Reparative (tertiary) dentin

Answer 7

localized formation of dentin on pulp-dentin border, protective response of pulp to seal itself off from external stimuli.

Question 8

Dead tracts

Answer 8

dentinal tubules devoid of cytoplasmic processes of odontoblasts

Question 9

Changes in pulp:

Pulp calcifications

Answer 9

Normal Aging Process - No pain caused. Asymptomatic

Denticles

Pulp stones

Diffuse linear calcifications

Question 10

Changes in pulp:

Diseases associated with prominent pulpal calcifications

Answer 10

Dentin dysplasia II

Pulpal dysplasia

Regional odontodysplasia

Tumoral calcinosis

Calcinosis universalis

Ehlers-Danlos syndrome

Question 11

Changes in cementum

Hypercementosis

Cementicles

Answer 11

Hypercementosis - abnormal thickening of cementum

A.Localized (One tooth)

1. inflammation
2. Excessive occlusion
3. Fracture/ repair
4. Loss of antagonist
5. Idiopathic

B. Generalized (Multiple teeth in an area)

1. Paget’s disease of bone

Cementicles - calcification in PDL, no clinical significance

Question 12

Dental root resorption

External vs. Internal

Answer 12

A.External resorption

1. Physiologic
2. Pathologic
   a. Inflammation
   b. Tumors and cysts
   c. Reimplanted teeth
   d. Mechanical force
   e. Impacted/ imbedded teeth
   f. Idiopathic

B. Internal resorption

A uniform, round to oval radiolucent enlargement of the root canal or chamber. Most often occurs following injury to pulpal tissue. The process can continue as long as vital pulp tissue remains.

Pathologic, usually asymptomatic.

Pink tooth of Mummery