Deformation of the Internal Connection of Narrow Implants after Insertion in Dense Bone: An in Vitro Study.

Rafael Delgado-Ruiz,Georgios Romanos,Ana Nicolas Silvente

doi:10.3390/ma12111833

Rafael Delgado-Ruiz, Georgios Romanos + Show 1 more

Open Access

https://doi.org/10.3390/ma12111833

Copy DOI

Abstract

Implant connections must resist surgical and prosthetic procedures without deformation. This study evaluated the deformation of different internal connections (IC) of narrow dental implants (NDI) after their insertion in artificial dense bone. Thirty NDI, with different IC geometries, Group A (internal hexagon), Group B (tri-channeled), and Group C (four-channeled), with the same length and similar narrow diameters, were inserted in type II density bone blocks. Drilling protocols for dense bone from each implant manufacturer were followed. The Insertion torque (IT), connection length, vertex angles, and wall deformations were analyzed before and after the insertion of the implants. ANOVA (Analysis of Variance) and Tukey post-test were used for statistical comparisons. IT values were higher for Group A, surface damage, and titanium particles were observed in the IC in all the groups. Angle deformations between 5 and 70 degrees were present in all the groups, and the walls of Group B connection were the most affected by deformations (p < 0.05). Within the limitations of this experiment, it can be concluded that narrow diameter implants will suffer deformation of the implant connection and will also experience surface damage and titanium particle release when inserted in type II bone density.

Highlights

IntroductionTwo-piece dental implant systems include an intraosseous part (the implant body) and an extraosseous component (the prosthetic abutment) that are usually connected with a retention/prosthetic screw [1]
Two-piece dental implant systems include an intraosseous part and an extraosseous component that are usually connected with a retention/prosthetic screw [1]
The union between these two parts occurs at the implant–abutment interface (IAI) [2], known as the implant–abutment junction (IAJ) or the implant–abutment connection (IAC) [3]

Summary

Introduction

Two-piece dental implant systems include an intraosseous part (the implant body) and an extraosseous component (the prosthetic abutment) that are usually connected with a retention/prosthetic screw [1]. Different geometric designs have been introduced for the implant connection (IC) and the prosthetic abutment connection (AC) with the purpose of facilitating the implant’s insertion, achieving a proper record of the implant’s orientation during the impression, improving the mechanical engagement between parts at the IAI, enhancing the mechanical strength, and reducing the screw loosening [6]. This geometric feature is called the “implant/prosthetic index”, and is defined as “a core or mold used to record or maintain the relative position of dental implants or teeth, to a cast, or to some other structure” [7]. The implant index corresponds, in terms of design, with its counterpart, the prosthetic

Objectives

Methods

Discussion

Conclusion