Abstract: Objective： To compare the effect of columnar combined implants immediately after treatment of peri- odontal system in patients with periodontitis. Methods： Total of 74 patients(128 teeth) with periodontitis admitted to our hospital from February 2015 to November 2017 were selected. According to the random number table method, it was divided into immediate group(37 cases, 62 teeth) and delayed group(37 cas- es, 66 teeth). Both groups received periodontal system treatment. Immediately, the column-shaped com- bined implant was implanted immediately after the tooth was removed. The delayed group was removed af- ter the tooth was removed. The columnar combination was implanted 6 to 8 months after operation. Im- plants. The depth of probing(PD), modified sulcus bleeding index(m SBI), modified plaque index(m PLI), and 3 months, 6 months, and 12 months after repair were compared immediately after repair in 2 groups. The red aesthetic score(PES) for the month, the stability of the implant 3 months after repair, and the im- plant retention rate within 1 year after repair. Results： There were no significant differences in the PD, m SBI and m PLI between the 2 groups immediately after repair and 3 months after repair (P>0.05). The PES scores at 3 months after immediate group repair were significantly higher than those in the delayed group(P<0.05). There was no significant difference in PES scores between the two groups at 6 months and 12 months after repair(P>0.05). There was no significant difference in the stability of implants between the two groups and the retention rate of implants within one year after repair(P>0.05). Conclusion： Imme-diate planting and delayed planting are equally effective in the treatment of severe periodontitis. The for- mer is better for save patients’visiting time and shorten treatment process. It is worth promoting.

Key words: periodontitis, periodontal system treatment, immediate planting, delayed planting, com-bined implants, stability