Relationship between implant stability on the abutment and platform level by means of resonance frequency analysis: A cross-sectional study.

Frederico Santos Lages,Thallita Pereira Queiroz,Dhelfeson Willya Douglas-De-Oliveira,Guilherme Siqueira Ibelli,Fatimah Assaf,Fernando Oliveira Costa,Arianna Di Napoli

doi:10.1371/journal.pone.0181873

Frederico Santos Lages, Thallita Pereira Queiroz + Show 5 more

Open Access

https://doi.org/10.1371/journal.pone.0181873

Copy DOI

Abstract

Resonance frequency analysis (RFA) has become the main tool used to assess the osseointegration of dental implants. The objective of this study was to verify the relationship between the ISQ values with different prosthetic abutments and with the implant platform. The hypothesis was that ISQ values changes according to the abutment height. Twelve patients were included, whose contribution to the study was 31 dental implants (external hexagon connection implants, 4.1x10 mm). The temporary implant-supported crown and prosthetic components were removed and the following smartpegs were inserted, one at a time: type 1, in the implant platform (G1); type A3, in the microunit component with 1mm transmucosal height (G2) and type A3, in the microunit component with 5mm transmucosal height (G3). In all the smartpegs, RFA measurements were taken on mesial, distal, buccal and lingual surfaces. All evaluations were performed by a single calibrated examiner (ICC = 0.989). Data were analyzed by Friedman and Spearman correlation tests and log-linear marginal regression (p<0.05). The mean age of participants was 52.83 (± 3.77) years. There was statistically significant difference (p<0.001) among the mean ISQ of G1 (88.27 ±5.70); G2 (72.75 ±4.73) and G3 (66.33 ±3.67). There was statistically significant negative correlation between the ISQ and the measurement distance (rs:-0.852; p<0.001; R2:0.553). Measurement distance was significantly associated (p<0.001) with ISQ value in the log-linear regression. The abutment height has a significant impact on resonance frequency analysis measurements. The higher the transmucosal abutment height, the lower the implant stability quotient value. Clinically, the ISQ measured on the abutment cannot be compared with values measured on the implant platform.

Highlights

In clinical research in implantology, there is great difficulty in assessing the osseointegration of implants
The value obtained by Osstell1 is automatically translated into an index called the Implant stability quotient (ISQ), ranging from 1 to 100, and allows stability to be evaluated over time, and to identify the conditions of bone around the implant [3,4]
The findings of this study suggest that the ISQ values obtained on the abutment cannot be compared with the platform values

Summary

Introduction

In clinical research in implantology, there is great difficulty in assessing the osseointegration of implants. Resonance frequency analysis (RFA) has become the main tool used, as it is a simple and noninvasive method that makes it possible to monitor implant stability throughout the required period [1]. RFA is measured by the Osstell device. This device that uses transducers connected to the implant or prosthetic components is available for various systems. The transducers (smartpegs) print a lateral force on the fixed components and the system shift is measured. RFA measures the stiffness and deflection of the implant-bone complex [2]. The implant stability can mainly be tested indirectly. Caution should be exercised when judging implant systems exclusively on the basis of RFA and torque measurement [5]

Objectives

Methods

Results

Discussion

Conclusion