Abstract
BackgroundTo compare the radiological parameters and success of posterior maxillary direct sinus lift with simultaneous or delayed implant placement, or implant placement in native bone, after a minimum follow-up period of 5 years.Material and MethodsA retrospective cohort study was carried out in a university clinic, selecting patients subjected to implant treatment in the posterior maxilla between the years 2005 and 2011. The patients were divided into three groups: 1) implants placed in native bone; 2) direct sinus lift with simultaneous implant placement; and 3) direct sinus lift with delayed implant placement. Bone crest level, bone loss, vertical bone gain, and implant success and survival after a minimum follow-up period of 5 years after prosthetic loading were analyzed.ResultsA total of 163 patients and 329 implants were included in the study. The mean duration of follow-up was 7.0 ± 1.9 years. Bone loss and implant success and survival were very similar in all three groups, with no significant differences among them. Graft reabsorption was greatest during the first 12 months, though graft stabilization was confirmed after 5 years of follow-up.ConclusionsBone loss and percentage success and survival proved very similar for the implants placed in native bone and for sinus lift with simultaneous or delayed implant placement. The height of the graft material decreased mainly in the first 12 months, and continued until stabilization after 5 years, with no significant variations thereafter. Key words:Sinus lift, pristine bone, native bone, dental implants, marginal bone loss, radiological study, implant survival, implant success.
Highlights
Implant insertion in the posterior maxilla can be problematic due to insufficient vertical and horizontal bone volume, and proximity to the maxillary sinus [1,2]
Galindo et al [9] recorded greater bone loss in implants placed after direct sinus lift compared with implants placed in native bone (0.83 mm vs 1.20 mm), while in contrast Schlegel et al [10] found 70.4% of the implants placed in native bone to present bone loss versus only 41.4% of the implants in the sinus lift group
In 2009, Sbordone et al [13] recorded a success rate of 95.8% after three years for implants placed in native bone, versus 85% for implants placed after sinus lift with bone particle grafting, though the difference between the two groups was not significant
Summary
Implant insertion in the posterior maxilla can be problematic due to insufficient vertical and horizontal bone volume, and proximity to the maxillary sinus [1,2]. In 2009, Sbordone et al [13] recorded a success rate of 95.8% after three years for implants placed in native bone, versus 85% for implants placed after sinus lift with bone particle grafting, though the difference between the two groups was not significant. The aim of the present study was to compare the success rate and radiological peri-implant parameters (bone loss and vertical bone gain) of implants placed in the posterior maxilla in native bone versus sinus lift with simultaneous or delayed implant placement. To compare the radiological parameters and success of posterior maxillary direct sinus lift with simultaneous or delayed implant placement, or implant placement in native bone, after a minimum follow-up period of 5 years. The height of the graft material decreased mainly in the first 12 months, and continued until stabilization after 5 years, with no significant variations thereafter
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