Correlation between resonance frequency, insertion torque and bone-implant contact in self-cutting threaded implants

Abstract

The aim of this study was to evaluate the correlation between resonance frequency analysis (RFA) values and the histomorphometric bone-implant contact (BIC) immediately after insertion of the implant. Additionally, it was examined to define which extent peak insertion torque (PIT) was correlated with the latter measurements. 15 Xive S plus root from dental implants were inserted in fresh porcine frontal bones. The insertion torque was measured with the Kavo Intrasurg 300 surgical unit. RFA connector was coupled to the implants and the mean value of 20 consecutive RFA measurements was calculated via Osstell ISQ device. The implants were removed with the adjacent bone with a band saw. The blocks were processed for undecalcified histology. Two perpendicular longitudinal middle sections of the implant were made and stained with toluidine blue and the BIC was assessed by histomorphometry. The correlation coefficient (Spearman) between RFA and BIC was R = 0.579 (p = 0.026, F test). The correlation between PIT and BIC (0.33, p > 0.05) and PIT and RFA (0.153, p > 0.05) was not statistically significant. The present data confirmed a moderate and statistically positive correlation between RFA and BIC. No correlation between BIC and PIT and PIT and RFA was observed. Further studies considering different bone qualities would be beneficial in understanding the relation between RFA and BIC.

Biomechanical Effects of a New Macrogeometry Design of Dental Implants: An In Vitro Experimental Analysis

“…The interaction between the implant and the adjacent bone immediately after its insertion depends mainly on the macrogeometry of the implant and the topography of its surface [41,42]. However, some studies in the literature still question the influence of surface treatment on the primary stability [12,[43][44][45][46] corroborated the results obtained in the present study, where the two implant designs did not present a statistical difference in the insertion torque values between the treated and non-treated surfaces.…”

“…The absence of correlation between RFA and IT has been reported in several studies [39,41,57]. However, an important finding was the reduction in the insertion torque values found, especially in the groups of the regular implant macrogeometry (G1 and G2), which can be considered as a loss of primary stability, even in the presence of high ISQ values.…”

Relationship between implant stability measurements obtained by insertion torque and resonance frequency analysis: A systematic review

“…Studies have suggested that high insertion torque values could be generated by aggressive implant insertion with increased thread depth that offers a close contact between the implant surface and the bone. 35 However, clinicians should be cautious about using excessive strain, because this compression on the press-fit regions could exceed the physiological limit and trigger bone resorption, leading to necrosis and dental implant failure. 36 The disadvantage of insertion torque is that it is a measurement that can be performed at only one time; that is, at the time of implant placement, while RFA can be realized in all the phases of treatment with implants.…”

“…Acil and colleagues 35 postulated that immediately after implant insertion, relaxation would begin to take place. This can affect the ISQ measurements as well as bone contact measurements.…”

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

“…The correlation between IT and ISQ has been investigated in numerous studies but it is still unclear: according to some authors the two parameters are in a direct relationship [ 14 , 15 ], and other studies demonstrated no statistically significant correlations between them [ 16 , 17 ].…”