1. METHODS:120 periapical curettage cases were divided into two groups randomly. 65 cases received therapy of the BIO-OSS bone dust implant.

2. Objective To demonstrate the mechanism of immunoreaction in periapical granuloma ( PG ).

3. Objective To evaluate the clinical effect on pulpal periapical diseases treated with compound hydroxyapatite root canal filling materials.

4. Methods:The 50 teeth diseased with fistulous chronic periapical periodontitis were treated with filling up one-off the pulp canal after 3% oxydol wash.

5. Objective To study treatment method that improve the chronic periapical periodontitis.

6. Objective: To observe the clinical effect of calcium hydroxide iodoform paste used in root canal disinfection on periapical abscess with sinuses.

7. Conclusion: Dry pipe pharmacotherapy is a modus operandi for acute and chronic disease of periapical.

8. Objective To evaluate and compare the efficacy of calciun hydroxide or formocresol as an intracanal medicament in root canal therapy of periapical periodontitis teeth.

9. Objective:To observe the restoration and healing effects of implantation of natural non organic bone(NNB)in chronic periapical bone destruction of anterior teeth or bicuspid teeth.

10. Objective To observe the therapeutic effect of Flagyl compound on acute periapical abscess.

11. Root canal therapy is currently the most effective treatment for pulpal and periapical diseases.

12. Objective To compare the clinical effect of tinidazole iodoform phenocamphor paste on acute periapical periodontitis with that of formocresol.

13. Objective: in older to demonstrate the local immunoreaction in periapical granulomas (PG) and categeries of cytomerphalogy as well as clinics significance.

14. Root canal therapy is a fundamental method of treating pulpal and periapical diseases nowadays.

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15. Objective:To observe the clinical effect of iodoform added with zinc oxide cataplasm to fill up one-off for treatment of fistulous chronic periapical periodontitis.

16. AIM:To discuss the clinical effect of BIO-OSS bone dust to the periapical bone defect after periapical curettage.

17. Objective To investigate the effect of tinidazole on the induced rat periapical periodontitis.

18. Objective To observe the clinical impact of Tinidazole on the treatment of Root-canal therapy and Periapical Periodontitis.

19. Objective : To observe effects of replantation on treatment of serious periapical periodontitis of molar.

20. Objective To observe the clinical effects of one off and traditional methods of root canal therapy in primary teeth with fistulous chronic periapical periodontitis.