DMS Ideal Properties Flashcards
1
Q
Ideal properties of a restorative material
A
- Strong
- Hard
- Bond to tooth for good marginal seal
- Requires minimal cavity preparation
- Thermal expansion similar to tooth
- Good aesthetics
- Good working time
- Command set
- Low thermal conductivity
- Radiopaque
- Cariostatic
- Young modulus similar to tooth?
- Biocompatible
2
Q
Ideal properties for a liner/base
A
- Easy to use
- Long working time for easy placement time
- Short setting time
- Low thermal conductivity
- Thermal expansion coefficient similar to dentine
- High compressive strength
- So filling can be placed without breaking
- Modulus similar to dentine
- Radiopaque
- Good marginal seal
- LOW SOLUBILITY
- Cariostatic
- Biocompatible
- Ph neutral
- No excessive haet during setting
3
Q
Ideal properties for a denture base
A
- Dimensionally accurate and stable in use
- High softening temperature
- Unaffected by oral fluids
- Thermal expansion not too high nor low
- Low density
- High thermal conductivity
- Radiopaque
- Non toxic/non irritant
- Suitable colour
- Easy to repair
- Mechanical properties
- High young’s modulus
- High proportional limit
- High flexural strength
- High fatigue strength
- High hardness/abrasion resistance
4
Q
Ideal properties of an impression material
A
- Accuracy
- Good flow to allow good recording of surface detail
- Viscosity
- hydrophilic/hydrophobic will effect surface contact
- Setting changes
- No dimensional changes
- Removal
- No effect on oral tissues
- No change dimensionally e.g thermal contraction due to differing temperatures from patients mouth
- Complete elastic recovery as it is stretched to overcome the maximum bolbusity
- Tear strength - will it withstand tearing when removed from undercuts
- Good flow to allow good recording of surface detail
- Storage
- Doesnt change in dimensions overtime
- Decontamination
- Dimensions and surfaces unaltered
- Compatible with cast material
- I.e gypsum
- Patient comfort
- Non toxic
- Non irritant
- Short setting time
- Removable without damage to oral tissues
- Operator convenience
- Quick technique
- Convenient working time
- Ability to be decontaminated
5
Q
Ideal properties of a temp material
A
- Non irritant
- Low temp rise during setting
- Dimensionally stable
- Good working time
- Adequate strength and wear resistance
- Good aesthetics
- Easy removal
6
Q
Ideal properties of a luting agent
A
- ow viscosity and film thickness
- To allow for easy seating
- Easy of use
- Long working time to allow for restoration to seat
- Radiopaque
- Marginal seal
- Want bond to tooth and indirect restoration
- Aesthetics
- Non staining
- Tooth coloured
- Low solubility
- Cariostatic
- Biocompatible
- Mechanical properties
- High strength
- High tensile strength
- High hardness
- YM similar to tooth
7
Q
Ideal properties of an investment material
A
- Able to expand
- Porous
- Strong
- Stable
8
Q
What is the properties of an endodontic instrument
A
- Strong
- High proportional limit
- Flexible
- Non-corrosive
9
Q
What are the properties of an endodontic irrigant
A
- Facilitate removal of debris
- Lubrication
- Dissolution of organic and inorganic matter
- Penetration to canal periphery
- Kill bacteria/yeasts/viruses
- Biofilm disruption
- Biological compatibility
- Does not weaken tooth structure
10
Q
What are the properties of an endodontic obturation material
A
- Easily manipulated
- Dimensionally by tissue fluids stable
- Seals the canal laterally and apically
- Non irritant
- Impervious to moisture
- Unaffected by tissue fluids
- Inhibits bacterial growth
- Radiopaque
- Does not discolour tooth
- Sterile
- Easily removed if necessary
11
Q
What are the ideal properties of an endodontic sealer
A
- Exhibits tackiness to provide good adhesion
- Establishes a hermetic seal
- Radiopacity
- Easily mixed
- No shrinkage on setting
- Non staining
- Bacteriostatic or does not encourage growth
- Slow set
- Insoluble in tissue fluids
- Tissue tolerant
- Soluble on retreatment
