| Sr. No |
Temperature in degrees centigrade |
Duration in minutes |
Sample Size |
Morphologic changes |
Radiographic Changes |
| 1 |
100 |
30 |
12 |
Pale to light yellow
retained surface luster |
No appreciable changes |
| 2 |
300 |
30 |
12 |
Light gray with dark gray patches
Roots - Yellowish brown |
Fissures between enamel and dentin |
| 3 |
500 |
30 |
12 |
Enamel –Light to Dark bluish gray Patches
Roots - Grayish brown
Loss of surface luster |
Fractures between enamel/dentin and within dentin |
| 4 |
700 |
30 |
12 |
Light bluish gray to Dark bluish gray
Disintegration into small fragments |
Fractures between enamel/dentin and within dentin |
| 5 |
1000 |
30 |
12 |
Neutral white with Light bluish gray
And Light greenish gray patches |
Large fractures spreading through dentine and crown crushing. |
