Cons 9.2

Front 1

Definition : of non carious lesion

Back 1

Non carious tooth defects are group of defects that the bacteria are not the prime cause .

Front 2

Types :

Non - carious lesions present in a variety of forms .

Back 2

•1.Abrasion •

Attrition

Abfraction .

Erosion .

Hypersensitivity .

• Trauma .

Tooth discoloration .

Front 3

Abrasion

definition:

Back 3

loss of tooth structure caused by mechanical action rther than mastication .

Front 4

Abrasion: case

Back 4

1 ) Incorrect use of tooth brush .

2 ) Use of an abrasive dentifrice .

3 ) Para functional habits .

Front 5

Abrasio: clinical features

Back 5

1 ) loss of enamel and dentin to produce a V - shaped notch at the neck of the tooth .

2 ) Hypersensitivity ,

3 ) Mild pain .

4 ) Sever pain when the pulp gets irreversibly involved .

Front 6

Abrasion management

Back 6

★Elimination of the causative factors .

1.If its shallow no need to be restored .

2.If its deep ( more than 0.5 mm ) → restoration is performed ( GI or composite )

Front 7

Attrition Definition :

Back 7

Loss of tooth structure through wear against the opposing dentition during normal function .

Front 8

Attrition Causes

Back 8

: Mainaly affects the incisal edges of the anterior teeth .

1 ) Bruxism .

2 ) Abrasives diet .

3 ) Constant chewing- tobacco .

4 ) Loss of posterior teeth .

Front 9

Attrition Clinical features :

Symptoms :

Clinical signs:

Back 9

Symptoms :

1.Tooth grinding at night

2.Jaw pain , fatigue and limited opening on waking

3.Teeth feel loose ( localised or generalised )

4.Sore teeth or sore gums

5.Headaches in the temporal region 6.Grinding or clenching of the teeth while awake .

Clinical signs :

1.Flattened enamel edges and occlusal surfaces

2.Tooth fractures - natural teeth or restorations

3.Tooth mobility

4.Pulp necrosis - as loads cause limitation of blood supply

5.Traumatic ulcers

6.TMJ problem

Front 10

Attrition

Treatment

Back 10

1 ) Shallow lesion can be restored with tooth colored restoration .

2 ) Pulpally involved teeth undergo endodontic therapy .

3 ) Para - functional activity can be controlled with protecting occlusal splints or managed with habit breaking appliance . b

Front 11

Erosion Definition :

Back 11

Loss of tooth structure by non bacteriogenic acid etching .

Front 12

Erosion : Causes :

Back 12

Extrinsic factor :

highly acidic diet.

2 ) Low PH carbonated drinks .

3 ) Strong citrus fruits

Intrinsic factors

. 1 ) Gastric reflux.

. 2 ) Vomiting ( bulimia nervosa )

. 3 ) Idiopathic factors .

Front 13

Erosion : Clinical features :

Back 13

1 ) A wide shallow lesion effecting the labial and palatal surfaces of the upper teeth .

2 ) Multiple cupped out depressions corresponding to the cusp tips .

3 ) Loss of lingual enamel and dentin due to acid .

Front 14

Erosion :

Management

Back 14

1 ) Stopping / reduc of acidic , carbonated beverages .

2 ) Treating the underlying medical disorder .

3 ) Fluoride application .

Front 15

Abfraction : Definition

Back 15

Is a loss of tooth enamel and dentin caused by biomechanical loading forces .

Front 16

Abfraction : Causes :

Back 16

Occlusal forces that cause tooth to bend , resulting in microfracture of enamel at the cervical region .

Front 17

Abfraction : Clinical features :

Back 17

1 ) Common in patients with poor tooth alignment .

2 ) Usually wedge"v" shaped lesion with sharp angles found in the cervical region .

Front 18

Managements : Abfraction :

Back 18

1.Desensitising agents and gentle tooth brushing instructions ,

2.In sever cases : occlusal adjustment , placing restoration to reduce sensitivity ,

Front 19

Dentin hypersensitivity :

Back 19

Dentin hypersensitivity

is a transient tooth pain characterized by a Short , sharp pain arising from exposed dentin in response to stimuli , typically thermal , tactile , osmotic or chemical ) .

Front 20

Theory of dentin hypersensitivity :

Back 20

hydrodynamic theory .

Front 21

Dentin hypersensitivity

Etiology :

Back 21

Dentin exposed by losing of ( Enamel )

Dentin exposed by gingival recession

Front 22

Classifications of desensitizing agents According to mode of action :

Back 22

1 ) Nerve desensitizing ( potassium nitrate ) 2 ) Protein precipitation . ( Gluteraldehyde ) 3 ) Plugging dentinal tubules . ( Sodium fluoride )

4 ) Dentin adhesive sealers . ( varnish / Gl / composite )

Front 23

The causes of fracture line :

Back 23

1 ) Physical trauma .

2 ) Occlusal prematurities .

3 ) Heavy and stressful chewing .

3 ) Resorption weakened teeth .

Front 24

There are two main groups of cracked teeth :

Back 24

★Vertical root fracture ( mainly occur in endodontically treated teeth )

★Tooth infarction ( incomplete tooth fracture )

Craze lines .

cuspal fractures

cracked teeth .

Front 25

Difficult to differentiate masticatory pain / pain from infarction / pain from microleakage

Back 25

Patient bite on a moist cotton roll

( if rebound pain occurs on release , it is very likely that one of the two teeth , maxillary or mandibular has an infarction .

micro leakage لو عض وطلع عنده وجع معناها

Front 26

Etiology : of cracked teeth

Back 26

1 ) Excessively large and incorrectly designed restoration . •

2 ) Pins .

3 ) Chewing action .

4 ) Bite onto hard objects .

5 ) Bruxism and clenching .

6 ) Acute trauma to the teeth ..

Front 27

Craze line :

Back 27

affect only the enamel , originate in the occlusal surface , are typically from occlusal forces and are asymptomatic .

Front 28

Fractured cusp :

Back 28

occur on the cusps and cervical margins of the root and can have acute pain on mastication and cold .

Front 29

Cracked tooth :

Back 29

occurs on the crown and may extend into the root .

Front 30

Split tooth :

Back 30

a fracture through the crown and root , ( separating the tooth into two segments )