Assessment of Osstell and Periotest systems in measuring dental implant stability (in vitro study)

Journal Article

• Volume Number: 23
• Pages: 17 - 21

Publication Abstract

Abstract
Objectives: The objectives of this in vitro study were to investigate the sensitivity and
reliability of the Osstell_ systems (Resonance Frequency Analysis – RFA) compared to the Periotest
_ system in implant bone simulated conditions. Three conditions were simulated: (1) the direct
fixture-bone contact and fibrous tissue fixture contact, (2) The different levels of horizontal bone
loss, and (3) The hardening implant–bone interface.
Materials and methods: Forty-nine dental implant fixtures were placed in the center of acrylic
cubes. In Part I seven fixtures were placed in direct contact with acrylic and another seven were
placed in contact with polyvinyl siloxane impression material as soft interface. Part II: four sets
of 0, 2, 4 and 6 mm horizontally exposed fixture samples were made (seven fixtures in each set). Part
III: seven fixtures were placed in contact with a thin mix of autopolymerizing resin. The stability of
these fixtures was measured using Osstell_ and Periotest_ systems.
Results: The mean Periotest_ value(PTV) and Osstell_ measurements showed a significant difference
between the direct contact and soft interface (P < 0.001). These values also showed statistically
significant difference between the different levels of horizontally exposed fixture groups
(P <0.001). The level of horizontal fixture exposure was strongly correlated with the PTVS
(r =0.967) and strongly negatively correlated with Implant Stability Quotient (r = _0.946). A
strong correlation was found between the Osstell_ readings and the change in the stiffness of the
autopolymerizing resin fixture interface group (r = 0.986).