Marginal bone loss around implants placed in maxillary native bone or grafted sinuses: a retrospective cohort study

Abstract

Implants placed in sites that received maxillary sinus augmentation exhibited more marginal bone loss than implants placed in pristine bone, although marginal bone loss mainly occurred during the first 12 months after functional loading. Implants with external implant connection were strongly associated with increased marginal bone loss overtime.

Marginal Bone Loss in Implants Placed in Grafted Maxillary Sinus

“…Mesial and distal bone losses at both 6 and 18 months were significantly greater in Microdent implants (with the external flat‐to‐flat connection) than in Astra Tech implants (with the internal conical connection) in agreement with previous reports . Pozzi and colleagues reported a similar trend in the lower maxilla and our group observed a similar pattern in posterior maxilla pristine bone, which showed a slightly lesser MBL in comparison with the grafted bone in the present study, with the difference in prosthetic connection being a key factor in both types of bone.…”

“…Further important criteria of success are related to the functional maintenance of implants in this type of bone, especially the marginal bone loss (MBL), which indicates peri‐implant health over time. A slight tendency has been observed for a greater loss in implants placed in maxillary bone grafts in comparison to pristine bone . Factors known to influence the MBL around implants in regenerated bone include the nature of this bone, the residual crest, the occlusion function, and the timing of the implantation …”

The prosthetic abutment height can affect marginal bone loss around dental implants

“…However, screw-retained restorations would be advantageous for plaque control because they are easy to remove and re-apply. In contrast to this study, Galindo-Moreno and colleagues30 showed that implants placed in augmented bone via maxillary sinus graft exhibited more MBL than implants placed in pristine bone. Although there was no statistically significant difference, mean MBL tended to increase in implants placed on mandible and in nonsubmerged implants.…”

Marginal Bone Loss in Implants Placed in the Maxillary Sinus Grafted With Anorganic Bovine Bone: A Prospective Clinical and Radiographic Study

“…Galindo‐Moreno et al 26 also presented significantly higher MBL around implants with external connections (1.30 mm) than those with internal connections (0.50 mm) after the 3‐year follow‐up period. Annibali et al 27 compared differences between platform‐switched and conventionally restored implants, concluding that a smaller amount of MBL was noted around platform‐switched implants despite no statistically significant difference in success rate.…”

“…Moreover, regardless if implants were placed either in the maxilla or mandible, and without specifying supporting tissue (i.e., grafts or native bone), implants still presented good results because only 20% of individuals and 11% of sites lost >1 mm, whereas 8% of individuals and 4% of sites lost >2 mm of marginal bone 24 . Galindo‐Moreno et al 25 , 26 compared MBL between native bone and grafted sinus, resulting in statistically significant differences in MBL between implants placed in grafted (1.09 mm) versus pristine (0.71 mm) bone at the 12‐month follow‐up. However, there were no differences in subsequent progression rate, which is in agreement with a previous study 13 .…”