Implant stability in the posterior maxilla: a controlled clinical trial

Abstract

Aim. To evaluate the primary and secondary stability of implants in the posterior maxilla. Methods. Patients were allocated into three groups: (A) native bone, (B) partially regenerated bone, and (C) nearly totally regenerated bone. Insertion torque (IT) and implant stability quotient (ISQ) were measured at placement, to evaluate whether satisfactory high primary stability (IT ≥ 45 N/cm; ISQ ≥ 60) was achieved; ISQ was measured 15, 30, 45, and 60 days after placement, to investigate the evolution to secondary stability. Results. 133 implants (Anyridge5, Megagen) were installed in 59 patients: 55 fixtures were placed in Group A, 57 in Group B, and 21 in Group C. Fifty-two implants had satisfactory high primary stability (IT ≥ 45 N/cm; ISQ ≥ 60). A positive correlation was found between all variables (IT, ISQ at t = 0, t = 60), and statistically higher IT and ISQ values were found for implants with satisfactory high primary stability. Significant differences were found for IT and ISQ between the groups (A, B, and C); however, no drops were reported in the median ISQ values during the healing period. Conclusions. The evaluation of the primary and secondary implant stability may contribute to higher implant survival/success rates in critical areas, such as the regenerated posterior maxilla. The present study is registered in the ISRCTN registry with ID ISRCTN33469250.

Correlation between Insertion Torque and Implant Stability Quotient in Tapered Implants with Knife-Edge Thread Design

“…Our data demonstrated a general linear relationship between insertion torque and implant stability: the strength of this correlation resulted statistically significant for the entire sample ( p = 0.0001), in accordance with a recent study by Zita Gomes et al [ 46 ] on tapered implants with knife-edge thread design placed in the posterior maxilla. However, at a deeper analysis, the linear relationship between insertion torque and implant stability is valid only in the medium torque group (30 < IT < 50 N/cm) ( p = 0.015), while it was not significant in low and high torque groups ( p = 0.094 and p = 0.565, resp.).…”

Recent advances and challenges in graphene‐based nanocomposite scaffolds for tissue engineering application

“…Ti is one of the best materials for manufacturing dental implants because of its desirable biocompatibility and mechanical strength. Despite various benefits of Ti implants, it may lead to implantation failure because it could promote fibrous tissue development 131,132 . It was reported that coating Ti implants with GO (1.5 mg/ml) improves biocompatibility as well as proliferation and osteogenic differentiation of cells 132 .…”