GC EUROPE GRADIA - Manual (Page 33)

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9. QUESTIONS & ANSWERS
Q1. After sandblasting, if alloy surface is touched with fingers will bond strength of
GC METALPRIMER II be affected?
A1. Yes. Sandblast alloy surface again and reapply GC METALPRIMER II.
Q2. Should sandblasted metal be ultrasonic or steam cleaned?
A2. No! The water may contain oil. Simply use filtered air pressure to remove aluminium
oxide residue.
Q3. Opaque is a little thick when dispensing from syringe. Is this a problem?
A3. Not a problem! GC GRADIA pastes are thixotropic (certain gels exhibit this property
but they become more fluid when stirred or put into motion, e.g. a syringe plunger).
The thixotropic property helps control flow and prevents OPAQUE from pooling in
undesired areas.
Q4. Can OPAQUE be diluted to improve flow?
A4. No, other than stirring it with a brush or spatula. GC COMPOSITE PRIMER and/or
GC GRADIA INTENSIVE COLORS should not be used to dilute opaque pastes.
Q5. Can OPAQUE tooth shade be used instead of FOUNDATION OPAQUE?
A5. Yes, but it may require four very thin layers (each layer being light cured) in order to
polymerize fully in undercut areas.
Q6. Is it possible to cover to the top of RETENTION BEADS II SSS with a single layer
of FOUNDATION OPAQUE?
A6. Yes! The SSS BEADS are 100μ, the curing depth of FOUNDATION OPAQUE is 300μ. A
single layer of FOUNDATION OPAQUE will be polymerized correctly in the underent
areas of the RETENTION BEADS II SSS.
Q7. OPAQUE did not cure.
A7. The OPAQUE layer might be too thick. Remove it and apply two very thin layers
instead of one thick layer.
Q8. Is there a way of preventing cracks in composite bridges?
A8. Yes,
a) Avoid applying large amounts of resin at one time between light cures.
b) Create breaks where materials overlap.
c) Build veneer by applying several thin layers, light curing them at each stage.
Q9. How can entrapping air bubbles be prevented?
A9. There are two ways:
1.Before applying resin, lightly tap top of the paste surface with a spatula (spatula
edge should not be nicked or rough. That will cause bubbles).
2.Apply thin coat of GC COMPOSITE PRIMER to roughened resin surface. Light cure
1 min. before applying next paste layer.
Q10. Which paste should be used on hollow part of a pontic?
A10. Build-up with TRANSLUCENT. Contour to conform to adjacent area, light cure, then
apply OPAQUE and light cure again.
Q11. Which light curing unit should be used?
A11. Those compatible with GC GRADIA – GC LABOLIGHT LV-III, GC STEPLIGHT SL-I.
Units radiating ultraviolet light can not be used. They may cure surface monomer
excessively, creating a non-bonding barrier between it and the next composite layer.
Q12. Can the brushes be cleaned?
A12. Yes! Clean thoroughly with pure alcohol (ethanol) after applying GC METALPRIMER II,
GC GRADIA DIE HARDNER, GC GRADIA SEPARATOR, OPAQUES. Make sure that the
ethanol dries off before re-using the tools. After using GC GRADIA AIR BARRIER, wash
brush thoroughly with water.
Q13. Is it hard to remove composite inlays from working model?
A13. No! Apply GC GRADIA DIE HARDNER, block-out undercuts with wax then apply the
GC GRADIA SEPARATOR.