| 1 | Remove excess cement immediately with a brush or instrument. | |
| 2 | Resin; cement; Fiber; post; Hybrid; layer; Microleakage; Scanning; electron; microscope; | |
| 3 | This paper is to introduce the development of GIC in recent years. | |
| 4 | Its effective to repair perforation of pulp floor with glass ionomer cement . | |
| 5 | Conclusion The zine oxide phosphorate base was a kind of effective measure to prevent post-bleaching external cervical resorption. |