Yhhyh Flashcards
(32 cards)
Front
Back
Broad temperature‑based categories of gutta‑percha obturation?
Cold techniques and warm/thermoplastic techniques
Who introduced the warm vertical compaction technique?
Dr. Herbert Schilder
Schilder’s five shaping ideals (list any three).
Continuous taper; small apical opening; decreasing diameter apically; cone fits close to terminus; apical tug‑back
What do the serrations on a Schilder plugger indicate?
Depth markers in 5 mm increments
How much of the master cone tip is typically cut back before re‑trying in warm vertical compaction?
0.5 – 1 mm
System B continuous‑wave plugger should stop how far short of working length?
5 – 7 mm
Standard System B plugger touch‑mode temperature?
≈ 200 °C
Why apply a brief 1‑second heat pulse before withdrawing the System B plugger?
Prevents apical suction and allows clean withdrawal of the plugger
Endotec II combines which two physical actions?
Heat and vibration
Endotec II heated tip is inserted to what distance from working length?
2 – 4 mm short of WL
Optimal needle placement for thermoplastic GP injection relative to apex?
3 – 5 mm short of the apex
Obtura III heats gutta‑percha pellets to roughly what temperature?
≈ 160 °C
Primary advantage of thermoplastic GP injection over cold techniques?
Superior adaptation to irregularities and internal resorption areas
Major mechanical risk associated with traditional warm vertical compaction?
Vertical root fracture (and overfilling)
Approximate temperature rise that can harm periodontal tissues?
> 10 °C
Hybrid warm lateral techniques aim to combine what two advantages?
Length control of cold lateral compaction and density/seal of warm vertical compaction
What clinical sign confirms a proper apical stop by the master cone?
Tug‑back (slight resistance on withdrawal)
How do you compensate for shrinkage of injected GP during cooling?
Maintain sustained apical pressure/condensation until the GP sets
Which device integrates System B heat and an extrusion handpiece in one unit?
Elements obturation system
Which Ultrafil cannula sets the fastest and requires immediate compaction?
Endo Set cannula (≈ 2 min set)
Why is a continuous taper essential for thermoplastic injection techniques?
Provides removal path for needle and prevents uncontrolled back‑pressure/extrusion
Warm technique with the highest vertical fracture risk?
Traditional warm vertical compaction (Schilder technique)
