Effect of implanting single-crown prosthesis with different crown-root ratios in the treatment of oral implant patients
Objective To investigate the effect of implanting single-crown prosthesis with different crown-root ratios in the treatment of oral implant patients.Methods 98 patients(98 implants)with single crown restoration as study subjects were divided into a study group and a control group according to bicolor sphere method,with 49 cases(49 implants)in each group.The control group was implanted with single-crown prosthesis with crown-root ratio<1,and the study group was implanted with single-crown prosthesis with crown-root ratio of 1-2.The incidence of dental implant detachment,bone resorption around the implant at 1,6 and 18 months after implantation,and the bone metabolism(including alkaline phosphatase,osteoprotegerin and osteocalcin)in gingival crevicular fluid before treatment and 30,90 and 180 d after treatment were compared between the two groups.Results The incidence of dental implant detachment at 1,6 and 18 months after implantation in the study group were 2.04% ,0 and 2.04% ,while those in the control group were 0,2.04% and 4.08% .There was no statistical significance in the incidence of dental implant detachment at 1,6 and 18 months after implantation between the two groups(P>0.05).In the study group,the bone resorption around the implant was(0.42±0.12)mm at 1 month after implantation,(0.52±0.13)mm at 6 months after implantation,and(0.83±0.10)mm at 18 months after implantation;in the control group,the bone resorption around the implant was(0.40±0.11)mm at 1 month after implantation,(0.54±0.12)mm at 6 months after implantation,and(0.84±0.14)mm at 18 months after implantation.There was no significant difference in bone resorption around the implant between the two groups at 1,6 and 18 months after implantation(P>0.05).The levels of alkaline phosphatase,osteoprotegerin and osteocalcin in gingival crevicular fluid were compared between the two groups before treatment and 30,90 and 180 d after treatment,and the difference was not statistically significant(P>0.05).Conclusion Single-crown prosthesis with a crown-root ratio<1 or a crown-root ratio of 1-2 have good therapeutic effects for oral implant patients and are worth promoting.
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