Abstract
Objectives: The objectives of this in vitro study were to investigate the sensitivity and reliability of the Osstell (TM) systems (Resonance Frequency Analysis - RFA) compared to the Perio-test (R) 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 (TM) and Periotest((R)) systems.
Results: The mean Periotest (R) value(PTV) and Osstell (TM) 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 (TM) readings and the change in the stiffness of the autopolymerizing resin fixture interface group (r = 0.986).
Conclusions: Both Osstell (TM) and Periotest((R)) systems proved to be sensitive in measuring dental implant stability in hard and in soft interfaces. Osstell (TM) also proved to be sensitive in detecting changes in the fixture interface stiffness. Osstell (TM) system proved to be more reliable compared to Periotest((R)) system in measuring dental implant stability in hard and in soft interfaces. (C) 2010 King Saud University. Production and hosting by Elsevier B.V. All rights reserved.