Lecture 2

Who regulates dental materials for safety/effectiveness?

FDA

What helps dental professionals recommend safe/effective products?

ADA Seal of Acceptance

What organization works with ADA to set standards?

ANSI (American National Standards Institute)

What are the classifications of dental materials?

• Restorative

• Preventive

• Laboratory

• Cements

• Liners

• Bases

• Impression Materials

What is a direct restoration?

Applied directly in the mouth

• EX: composites, amalgam

What is an indirect restoration?

Fabricated in a dental lab

• EX: crown, castings

What are the mechanical properties?

• Force

• Stress

• Strain

List 3 types of forces

• Sheer = breakdown of material

• Tensile = pulls/stretch

• Compressive = pushes together

What do mechanical forces cause?

Abrasion (wearing away of tooth surface)

What is attrition?

Tooth-to-tooth wear

What does thermal contraction/expansion cause?

• Microleakage

• Faulty restoration

What causes galvanic shock?

Saliva + 2 different metals (electrical)

What is erosion?

Loss due to chemical action

Ductility

ability to be stretched into wires

Malleability

Ability to be compressed into thin sheets

Cohesion

Attraction of like materials

Adhesion

Attraction of unlike materials

Corrosion

Reaction of metal with corrosive products

Tarnish

Surface discoloration of metal

Solubility

Ability to dissolve in fluid

Flow

Ability to move/fill prep

Viscosity

Thickness (resistance to flow)

Retention

Ability to hold two things together when they don’t naturally adhere

Curing

Hardening (chemical/auto-cure or light activated)

What are the parts of a dental dam clamp?

Jaw, Bone, Wings, Forceps holes

Where does the bow sit?

Distal to anchor tooth

What is the anchor tooth?

Tooth that holds the clamp

What is a ligature?

Floss tied around clap for safety

Class I Restoration

Pits and fissures

• (occlusal, buccal, lingual)

Class II Restoration

Interproximal surfaces of premolars/molars

• (Mesial/Distal Surfaces)

Class III Restoration

Interproximal surfaces of anterior teeth

• Mesial/Distal surfaces

Class IV Restoration

Interproximal surface + Incisal Edge

• (Mesial/Distal Surfaces + Incisal Edge)

• Only for anterior teeth

Class V Restoration

Cervical third (gingival area) near area

Class VI

Cusp tips or Incisal edge

• Happens from grinding/cletching

What are complex restorations?

Large lesions needing retention pins

What are intermediate restorations?

Temporary fillings