dental cements Flashcards
Are hard, brittle materials formed by mixing powder and liquid together.
DENTAL CEMENTS
PROPERTIES OF DENTAL CEMENTS: (8)
1.Strength
2.Solubility
3.Viscosity & Film Thickness
4.Biocompatibility
5.Anti-cariogenic Properties
6.Retention & Adhesion
7.Esthetics
8.Radiopacity
Strongest cement:
Weakest cement
resin
ZOE
EFFECTS of HIGH SOLUBILITY OF CEMENTS (4)
- Marginal ditching
- Microleakage
- Recurrent caries
- Failure of the restoration
- Luting Consistency
- Thin mix wherein cement will be able to flow easily and completely
- 25micrometers or less (ADA)
- String Test/ Spinnbarkeit test
PRIMARY CONSISTENCY
- Thick putty-like consistency
- Used as bases and restorations
- Addition of powder increases consistency and strength, decreasing solubility
- .75 mm or greater thickness
SECONDARY CONSISTENCY
USES OF DENTAL CEMENTS (4)
1.Pulpal Protection
2. Luting
3. Restorations
4. Surgical Dressings
RDT must be 2mm and above
to prevent pulp irritation
True
- Acts as a protective barrier between preparation and restoration
- is a solution of one or more resins which when applied onto the cavity walls, evaporates leaving a thin resin film, that serves as a barrier between the restoration and the dentinal tubules.
- Prevents amalgam stains on teeth
CAVITY VARNISH
- Low Strength Base/Liner
CALCIUM HYDROXIDE
- GOLD STANDARD in PULP CAPPING ..(2)
CALCIUM HYDROXIDE
1.Stimulates reparative dentin when in direct contact with the pulp
2.Has antimicrobial and thermal insulating
Properties
- Provide thermal insulation and support for restoration
- Secondary consistency
HIGH STRENGTH BASE/LINER
material with low viscosity placed between tooth structure and prosthesis
primary consistency
Luting Cement
Stronger than luting cements.
Provide micromechanical retention between tooth, resin-based cement and restorative material
Bonding cements
RESTORATIONS (2)
as temporary/provisional filling
As permanent restoration (GIC &RMGIC only)
provide protection and support for surgical site
provide patient comfort
Help control bleeding
SURGICAL DRESSINGS
DENTAL CEMENTS (6)
Zinc Phosphate
Zinc Polycarboxylate
Zinc Oxide Eugenol
Silicate Cement
Glass Ionomer Cement
Resin Modified-GIC
Oldest of the cement
Not widely used today
Zinc Phosphate
first cement developed with an adhesive bond to tooth structures
Adheres to tooth structure by chelation of ca2+ in enamel and dentin by carboxyl grp of polyacrylic
Zinc Polycarboxylate
Widely used , least irritating of all
Ideal for temporary restorations
Cannot be placed as liner/base when using resin-based restorations. Why?
Zinc Oxide Eugenol
- Introduced by Fletscher as an anterior esthetic filling material
- Translucent and resembled porcelain in appearance
- Initial esthetic was satisfactory but over a period of time, silicates degraded and stained
- anticariogenic property is due to presence of 15%
fluoride - were classed as a severe irritant to the pulp because of its low pH (acidic)
- By the 1980s and 1990s they were gradually phased out of the market
Silicate Cement
One of the most versatile cements used today
Glass Ionomer Cement
Zinc Oxide Eugenol Types (4)
Type I Temporary cementation
Type II Permanent cementation
Type III Bases and temporary restorations
Type IV Cavity liners
Glass Ionomer Cement Types (9; LRLPLCHAP)
Type 1 Luting
Type 2 Restorative
Type 3 Liner/base
Type 4 Pit & fissure sealant
Type 5 Luting for orthodontic
Type 6 Core build up
Type 7 High Fluoride releasing
Type 8 Atraumatic restorative tx
Type 9 Pediatric GIC
- Similar to the component of GIC + resin
Improve bond strength, compressive and tensile strength
Decrease solubility
Fluoride release
X expansion of material after setting for all ceramic restorations increasing risk of fracture
Resin-Modified Glass Ionomer Cement
(RMGIC)
INSTRUMENT SETUP
glass mixing slab
powder
liquid
stainless steel spatula
plugger
plastic instrument
