2.4 Class V lesions

What class are considered as smooth surface restoration

Class V lesions

T or F: Class V lesions may be carious or non-carious

True
may be caused by erosion, abrasion, or abfraction

Color of active carious lesions

yellow/brown

Color of inactive carious lesions

Dark brown or black

Plaque would be on which type of lesion

Active lesion only

Inactive typically don’t have plaque

The CEJ is ______ making it more retentive to bacteris

irregular

Cementum is (more/less) susceptible to drops in pH than Enamel.

more
caries process begins at pH below 6.2-6.7

Abfraction vs Abrasion

Abfration is loss of tooth surface in the cervical area, caused by tooth grinding compression forces

Enamel rod fracture and dislodge

Abrasion is excessive mechanical or frictional forces

Loss of tooth structure due to aggressive brushing is an example of

abrasion

Chemical loss of tooth structure without bacteria

Erosion

Abrasion causes smooth, concave ______ shaped lesions along the gum line

V or U

brush at a ______ angle

45 degree

abfraction lesions tend to occur on the _____ surface

facial
lingual surface is compressed while the lingual surface is flexed

How can you differentiate between abfraction and abrasion

Check occlusion
abfraction is typically localized while abrasion will affect many/all of the teeth

abrasion is typically caused by the (toothpaste/toothbrush)

toothpaste

It is unlikely, that toothbrushing alone causes abrasion. Presence of _____ greatly increases the risk of abrasion.

acid

Extrinsic causes of erosion

soda, coffee, citrus fruit

Intrinsic causes of erosion

GERD, bulimia, regurgitation

Extrinsic erosion affects the _____ surfaces

intrinsic erosion affects the ____ surfaces of _____ teeth

occlusal and labial

Occlusal and lingual of maxillary and facial of mandibular anterior teeth.

Cervical enamel is (more/less) brittle

more

What is usually the problem of NCCL

occlusion issue

Direct thermal shock to the pulp via temperature changes transferred from the oral cavity through the _______ _______, especially when remaining dentin is thin.

restorative material

Use of insulating base is indicated in composite or amalgam

How thick should the base be

amalgam

0.50 to 0.75 mm no more than 0.75 mm

The theory of hydrodynamics of the pulp states that there is a gap between the tooth and the restoration which allows fluid to enter the space. _____ fluids can cause a sudden contraction of the tubule which causes an _____ in the flow of dentinal fluid which is perceived as pain

Cold
increase

As dentin nears the pulp, tubule density and diameter _______

increase

Explain why deeper restorations with more problem of sensitivity

Rubber Dam Clamp for Class V lesion

212 clamp

Shade selection should be with dry or wet teeth

Wet

Dry have different shade