Week 10 PP

Question 1

What types of cements are available?

Answer 1

Type 1 - luting agents - act as adhesive (glue)

Type 2 - Used as restorative materials and intermediate restorative material

Type 3 - Used as liners and bases when cavity is deep and close to the pulp

Question 2

Types of Permanent Cements

Answer 2

Glass Ionomer cement
Polycarboxylate cement
Zinc Phosphate

Question 3

Luted Cements vs. Bonded

Answer 3

Luted Cement:
-Restorations fused with metal, gold (inlays, onlays, crowns, etc.)
-anything with metal will be luted because light cannot penetrate metal
-Simpler steps
-Less appointment time required (example: Glass Ionomer, Polycarboxylate and Zinc Phosphate)

Bonded:
-Porcelain or ceramic restorations (veneers for example)
-Bonding is very technique sensitive
-More time is required for the appointment

Question 4

Mixing Principles

Answer 4

1. Invert powder and dispense powder first
2. Liquid 2nd
3. Hold liquid vertical to ensure drops are consistent in size
4. Place materials on opposite ends of the mixing surface
5. add powder to liquid
6. do not leave any unmixed materials on the mixing pad (unless indicated)
7. consider humidity and temperature (avoid premature exposure)
8. correct ratio is a MUST
9. do not let material set on instruments - always have moist 2x2 gauze ready

Question 5

Glass Ionomer Cement

Answer 5

• most versatile and very popular
  -fluoride releases
  -6 different types available (Type I luting cement, Type VI used for core buildups)
  -Low solubility (does not disolve easily)
  -Self curing and light curing
  -water & polyacrylic acid
  -variety of applications

Question 6

Resin Modified Glass Ionomer Cement

Answer 6

-Hybrid
-User friendly
-Minimal sensitivity
-fluoride release
-Even better adhesion to dentin and enamel
-user friendly… and longer working time
-light cure automix
-distilled water & polyacrylic acid

Question 7

Resin Based Cement

Answer 7

-Lute and bond
-Better wear resistance
-Available in many colour shades
-acid etch must be applied prior to
-light cure or dual cure

Question 8

Zinc Oxide - Eugenol Cement

Answer 8

IV types available: type I - temporary/least strong, type II - permanent - soothing and reinforced/ ingredient added
-eugenol, water, acetic acid
-PH level 7.0 least irritating
-can have allergies to eugenol which will be irritating to tissue – be aware
-glass slab = slower set

Question 9

Polycarboxylate Cement

Answer 9

-Oldest cement
-no sensitivity
-Can be used as long term temporary
-Material full strength after 24 hours
-Polyacrylic acid and water

Question 10

Zinc Phosphate Cement

Answer 10

-Oldest cement
-reliable = cast doesn’t come off
-Two types available (Type I used for cast restorations)
-can cause sensitivty
-phosphoric acid and water
-dissipate heat = figure 8 mixing movement, cool class slab

Question 11

Cement Removal

Answer 11

RDAs monitor setting time and removes permanent cement

-floss 1st!
-use explorer to remove any cement along the margins supra and subgingival
-double check with patient if bite still feels good

-notifies dentist of the outcome before patient is dismissed
-Dentist does final check

Question 12

Post Op Instructions for Permanent Cement

Answer 12

DA will provide written and verbal - custom based on appointment

• LA precautions
  -cement setting time
  -tooth sensitivity
  -bite feels wrong
  -brush and floss normally
  -questions and concerns call the office

Question 13

Use and Care of Equipment and Materials

Answer 13

-Be familiar with how to use
-check dates
-disinfect products twice after use
-not always possible to switch into clean exam gloves
-not always possible to dispense with clean hands (materials are corrosive)
-Don’t let cements/materials set on instruments
-Wipe or wrap in moist gauze ASAP