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. 2021 Nov 12;14(22):6832.
doi: 10.3390/ma14226832.

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

Mahnaz Arshad  1   2 , Sina Khayat Zadeh  3 , Mohammad Atai  4 , Gholamreza Shirani  5 , Georgios E Romanos  6 , Seyed Hossein Bassir  6
Affiliations

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

Mahnaz Arshad et al. Materials (Basel). .

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.

Keywords: adhesives; dental implants; dental implant–abutment design; in vitro; torque.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Application of Impladhesive bio-adhesive to the abutment screw threads.
Figure 2
Figure 2
Placement of the abutment–implant assembly into the fixation clamp.
Figure 3
Figure 3
Evaluation of rotational misfit using video measuring machine.
Figure 4
Figure 4
Results of MTT cell vitality assay for negative control, positive control, and test samples after 1 h, 1 day, and 1 week.
See this image and copyright information in PMC

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