Class V Restorations

True / False: use of amagalm in the esthetic zone should be avoided

True

What teeth comprise the esthetic zone?

MB of max 1st molar to MB of max 1st molar

Smooth surfaces produce decay from --- to --- at the DEJ

apex to base

Pits and fissures produce decay from ---- to ---- at the DEJ

base to base

Where are class 5 caries detected?

gingival third of buccal or lingual surfaces

True / False: a halo indicates extensive decay

True

True / False: class 5 caries are typically detected through radiographic detection

false - cannot examine radiographically, need visualization

What are abrasion lesions?

non-carious cervical lesions caused by mechanical wear of the tooth structure due to external forces

True / False: abrasion lesions are caused by caries

False - caused by abrasion

Composite relies on ---- preparation design

Mechanical / retention

True / False: bonding to enamel is more predictable and lasts longer than bonding to dentin

True

----- preparations for small to moderate composite preparation

Adhesive

---- preparation for amalgam and large composite preparations

Conventional

When to use amalgam?

Non-esthetic zone

Root surface decay

Crown margin repair

What material to use in poor isolation or aesthetic areas?

RMGI = resin modified glass ionomer

Principles of Cavity Preparation of Class 5

1. Outline form

2. Resistance form

3. Retention form

4. Convenience form

True / False: composite needs very rounded internal line angles

True

Decay determines ---- form

Outline

What is removed in creating a resistance form?

Unsupported enamel

The top of the handpiece should always be

parallel to the long axis of the tooth

True / False: Tilting the handpiece too much can cause undercuts, overcuts, or irregular cavity walls

True

The outline form should always be extended to ---- tooth structure

sound tooth structure

In class 5 caries, decay frequently extends ---- creating an access problem

subgnigivally

What happens when you feel the burr bounce?

Entering sound tooth structure

Electrosurgery

high-frequency electrical currents to cut, coagulate, or reshape soft tissues in dental procedures

What is the purpose of isolation in tooth preparation

Crucial for maintaining a dry, clean, and contamination-free working environment

What is a 212 clamp used for?

Gingival retraction

In a 212 clamp for gingival retraction what is the order for lingual and buccal jaw placement?

Place lingual jaw first under HOC

Place buccal jaw below the decay

True / False: RMGI releases fluoride

true

What does RMGI have to bond to?

Sound tooth structure

True / False: Preparation for composite and RMGI can be created using a round burr

True

Cavosurface angle must be --- degrees

90 degrees

What needs retention features: composite, amalgam, or RMGI

amalgam

What can be used to place retention features?

1/4 Round burr

Inverted cone

Where should retention features be placed in a Class V preparation?

In the DEJ

When contouring a class 5 a discoid cleiod would create a ---- surface

concave