1. Objective: To compare the efficiency of four-handed technique with traditional oral treatment in root canal obturation.

2. Conclusion The four-handed technique makes for improvement of clinical ability of postgraduates, which is of great significance in teaching.

3. Methods The status of the application of four-handed technique in clinical teaching was investigated and analyzed.

4. Objective To assess four-handed technique in clinical odontoplasty teaching for postgraduates.

5. Conclusion Four-handed operation with high efficiency, high-quality features, nurses master the operating procedures, and rapid medical treatment with the whole, improve the clinical cure rate.

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6. High standard of clinical technique and well performed four-handed technique are the key for the successful treatment.

7. Results "Four-handed"technique was adopted in 6.00% of the clinics, while rubber dams were used only in 0.67% of the clinics.

8. Conclusion: The four-handed technique may improve the efficiency of root canal treatment, especially for the cases with several root canals.

9. Objective To evaluate the therapeutic efficiency of the four-handed technique in oral treatment.

10. Methods: Various dangerous factors of professional exposure faced by the nursing staff in oral department in the four-handed dentistry were analyzed so as to explore and work out effective strategy.

11. Objective:To discuss the main point of the application of four-handed dentistry used in magnetic over-denture for the defect or miss of the denture in department of stomatology.

12. She asks if you'd like to make some money, tax-free, doing a four-handed foot manipulation for her next client.

13. Objective:To discuss the relationship between the efficiency, the rate of closed off and the four-handed procedure in the pit and fissure sealant.

14. Objective To explore the key of nurses cooperation, advantage and disadvantage of the four-handed technique in children root canal treatment.