Page 179 - My FlipBook

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GUTTA PERCHA 1 47

3. Superior Gutta-percha Stopping—high heat.
Medium Heat,
4. Flagg's Gutta-percha Stopping | High Heat,
^ Low Heat.

5. White Base Plate Gutta-percha—medium heat.
6. Pink Base Plate Gutta-percha—medium heat.
7. Hill's Stopping.
Feldspar i part.

Quartz i part.
Formula
Quicklime 2 parts,
(Herman Prinz)
Gutta-percha base plate q.s. to make
a stiff paste.
—
8. Temporary Stopping (dressing seal)—low heat.
White or Pink Base Plate^4''parts,
Formula: \ Zinc Oxid 4 parts,
White Wax i part.
Used for sealing temporary dressings.
9. Gutta-percha Points for Filling Canals.

Advantages of Gutta-percha.
1. Non-conductivity.
2. Ease of introduction.
3. Harmonious color (the white varieties).
4. Elasticity — (an advantage in making slow separa-

tion).
Disadvantages.
1. Low Crushing resistance. It cannot be used as a

permanent filling material on surfaces exposed to
mastication,
2. Subject to chemical action of lactic acid and sulfids
in unclean mouths, readily disintegrating.
3. Shrinkage on cooling, with consequent tendency to
draw from cavity walls.

4. Incapability of polish.