Objectives : With the aim of improving the stability of implant prostheses, the clinical course after placement of singlestanding implants in the mandibular molar region was compared between screw-retained and cement-retained implants.

Subjects and methods : The subjects were a total of 71 implants placed in 55 patients in the clinic where the first author practices. Patients were followed up to compare the incidence rates of peri-implant mucositis, peri-implantitis, and other complications between screw-retained and cement-retained implants.

Results : Single-standing implants were stable (success rate : 98.6%). Incidence rates of peri-implant mucositis and periimplantitis did not differ significantly between screw-retained and cement-retained implants, at 17.2% (5/29) and 31.0% (13/42), respectively, for peri-implant mucositis and 3.4% (1/29) and 7.1% (3/42), respectively, for peri-implantitis. Furthermore, there were no significant differences in all investigation items between screw-retained and cement-retained implants.

Discussion and conclusion : There were no significant differences in the prevalence of peri-implant mucositis and periimplantitis between screw-retained and cement-retained implants. The findings of this study highlight the importance of choosing a fixation method based on specific advantages and disadvantages in individual cases.