Silicate Cement Flashcards
silicate cement comes in what system
POWDER AND LIQUID
powder component of silicate cement
- SILICA
- ALUMINA
- NaFl and CaFl
liquid component of silicate cemment
- PHOSPHORIC ACID
- BUFFERING AGENTS (ZnPO4 and AlPO4)
these function to neutralize the acidity of the orthophosporic acid component of silicate cement
BUFFERING AGENTS: ZINC PHOSPHATE AND ALUMINUM PHOSPHATE
why is there a need to neutralize the acidity of phosphoric acid
BECAUSE ACID IS HARMFUL TO THE PULP
9 properties of silicate cement
- Optical properties: shade and translucency
- Plasticity
3 Thermal Consductivity - Coefficient of Thermal Expansion
- Compressive Strength
- Solubility
- Irritating to gingival tissues
- Polymerization
- Radiographic appearance
T or F: for the first 24 hours, the shade of silicate cement is darker
TRUE. it becomes lighter and translucent as it sets
T or F: there is a change in the shade when silicate cement comes in contact with moisture
TRUE. That is why there is a need for proper isolation of the tooth
T or F: when dehydrated, silicate cement becomes more translucent
FALSE. It becomes more OPAQUE with dehydration
too much ______ in the mix affects the shade and optical property of silicate cement
POWDER
this property of silicate cement is associated with its ease of manipulation and adaptation to cavity wall
PLASTICITY
no need for bulky base to protect the pulp because silicate cement has…
same THERMAL CONDUCTIVITY with tooth. only needs thin liner to prevent chemicals from entering dentinal tubules
T or F: silicate cement has same coefficient of thermal expansion as the tooth
TRUE. it has LOW CTE and is stable under changes in oral cavity
this is the property of silicate cement that makes it unfavorable and classifies it as a temporary restoration
SOLUBILITY
silicate cement is soluble in oral fluids just like _____
GIC
this property of silicate cement makes it contraindicated with cervical 3rd caries and Class IV caries that extend to gingival margins
IRRITATION TO GINGIVAL TISSUES
why is silicate cement not recommended for Class IV extensive caries and areas where masticatory forces are present
because it has LOW COMPRESSIVE STRENGTH = BRITTLE
property of silicate cement that corresponds to its shrinkage of 0.25%
POLYMERIZATION
T or F: silicate cement is radiopaque
F. it is RADIOLUCENT just like caries
indications of silicate cemet
- caries susceptible patient
- small incipient caries
why is silicate cement indicated for caries susceptible patients
because it has an ANTICARIOGENIC property
T or F: silicate cement is indicated in areas where there is extensive subgingival caries
FALSE. it is contraindicated in Class V caries
silicate cement is contraindicated to what class of caries
Class I that receives direct masticatory forces and heavy force
Class IV where incisal angle is to be replaced
Class V
T or F: silicate cement is contraindicated with mouth breathers
TRUE. because surface DEHYDRATION will occur
T or F: silicate cement can be used in Class IV caries given that the patient has an open bite
TRUE. bite is favorable and won’t contact
ratio of powder to liquid when manipulating silicate cement
2 scoops powder, 2 drops liquid
consistency desired when manipulating silicate cement
PUTTY or DOUGHY
silicate cement shall be mixed for
1 minute in circular, compressive, and folding manner
advantages of silicate cement (3)
- has anticariogenic property
- easy to manipulate
- tooth color matching ability
disadvantages of silicate cement (4)
- easily discolors
- easily loses its contours
- low strength
- has high acidity
