[Clinical evaluation of two-implant-supported single molar restoration].

PURPOSE: This study was to evaluate the clinical effect of two-implant-supported single molar restoration with wider interdental space. METHODS: 32 subjects who presented 38 single molar missing with wider interdental space were involved in this study. Two-implant-supported single molar restoration was performed with Branemark system or Replace system. The stability of the implant restoration, periodontal condition, and peri-implant bone absorption were investigated 3 months, 1 year and 3 years after restoration. The periodontal condition was analyzed by Wilcoxon signed rank test or Chi-square test and the peri-implant bone absorption was analyzed by paired t test using SPSS13.0 software package. RESULTS: Among 76 implants, one implant was lost in 2 weeks after surgery, which had been re-implanted successfully 3 months later. After loading, the survival rate of 76 implants was 100% during the next three years with perfect osseointegration. No significant differences for the plaque index, bleeding on probing, probing depth were found 3 months, 1 year and 3 years after restoration (P>0.05). The bone absorption of peri-implant was (0.56+/-0.14)mm at 3-month and stable trends were shown at 1 year (0.15+/-0.05)mm and 3 years (0.17+/-0.06)mm, both of which were significantly lower than that at 3-month (P<0.05). CONCLUSION: Two-implant-supported single restoration is suitable for single molar missing with wider interdental space.