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Effect of Application of a Bio-Adhesive on the Removal Torque Value and Rotational Misfit at the Implant–Abutment Junction: An in Vitro Study Publisher



Arshad M1, 2 ; Zadeh SK3 ; Atai M4 ; Shirani G5 ; Romanos GE6 ; Bassir SH6
Authors
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Authors Affiliations
  1. 1. Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, 14155-6447, Iran
  2. 2. Department of Prosthodontics, School of Dentistry, International Campus, Tehran University of Medical Sciences, Tehran, 14399-55991, Iran
  3. 3. School of Dentistry, Tehran University of Medical Sciences, Tehran, 14399-55991, Iran
  4. 4. Iran Polymer and Petrochemical Institute (IPPI), Tehran, 14977-13115, Iran
  5. 5. Department of Oral and Maxillofacial Surgery, School of Dentistry, Tehran University of Medical Sciences, Tehran, 14399-55991, Iran
  6. 6. Department of Periodontology, School of Dental Medicine, Stony Brook University, Stony Brook, 11794, NY, United States

Source: Materials Published:2021


Abstract

The aim of this study was to assess the effect of application of a recently developed bio-adhesive (Impladhesive) to abutment screw threads on the removal torque value and rotational misfit at the implant–abutment junction. This in vitro study evaluated 20 implant fixtures and 20 straight abutments. Specimens were randomly divided into two groups (n = 10) with/without adhesive application. In the adhesive group, the abutment was dipped in Impladhesive before torquing. In the control group, the abutment was torqued conventionally without adhesive application. The removal torque value was recorded after completion of the cyclic loading of 500,000 cycles with 2 Hz frequency and 75 N load. Rotational misfit was recorded using a video measuring machine. After applying the torque, the change in the bisector angle on the abutment hex was recorded for each implant. The biocompatibility of Impladhesive was evaluated using a MTT cell vitality assay. Normal distribution of data was assessed using the Kolmogorov–Smirnov test. Data were analyzed using a t-test and Pearson’s correlation coefficient The application of Impladhesive at the implant–abutment interface resulted in significantly greater mean removal torque value compared to the control group (p = 0.008). In addition, the mean rotational misfit at the implant–abutment interface was significantly lower in the use of Impladhesive compared to the control group (p = 0.001). In addition, the cell vitality was found to be greater than 80% at all evaluated time points. It can be concluded that the application of Impladhesive on the abutment screw significantly decreased rotational misfit and increased the removal torque value. Future studies are needed to evaluate the efficacy of this bio-adhesive an in vivo setting. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.