Influence of Implant Connection, Abutment Design and Screw Insertion Torque on Implant-Abutment Misfit.

Jorge Vélez,Celia Tobar,María J Suárez,Jesús Peláez,Carlos López-Suárez,Rubén Agustín-Panadero

doi:10.3390/jcm9082365

Jorge Vélez, Celia Tobar + Show 4 more

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https://doi.org/10.3390/jcm9082365

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Abstract

Background: An accurate fit at the implant-abutment interface is an important factor to avoid biological and mechanical complications. The aim of this study was to evaluate the marginal misfit at the implant-abutment interface on external and Morse taper connection, with straight and angulated abutments under different insertion torque loads. Materials and Methods: A total of 120 implants were used, 60 with external connection (EC) and 60 with Morse taper connection (IC). Straight (SA) (n = 60) and angulated abutments (AA) (n = 60) were randomly screwed to each connection at different torque levels (n = 10 each): 10, 20 and 30 Ncm. All specimens were subjected to thermal and cyclic loading and the misfit was measured by scanning electron microscopy. Data were analyzed with one-way ANOVA, t-test and Kruskal-Wallis test. Results: Significant differences (p < 0.001) were found between connections and abutments regardless of the torque applied. Morse taper connections with straight and angulated abutments showed the lowest misfit values (0.6 µm). Misfit values decreased as torque increased. Conclusions: The misfit was affected by the type of connection. The type of abutment did not influence the fit in the Morse taper connection. The higher the tightening torque applied the increase in the fit of the implant-abutment interface.

Highlights

During the last decade, dental implants have been constantly evolving through development and research in order to improve the quality of patient care, allowing us to practice a comprehensive and global restorative dentistry, which means obtaining a complete integration between the hard and soft peri-implant tissues [1]
The present study aimed to evaluate the marginal misfit of the implant-abutment interface on external and Morse Taper connection, with straight and angulated abutments and at different insertion torque loads
The results obtained support the rejection of the null hypothesis, as differences in marginal adjustment were found depending on the type of connection, the type of abutment and the different tightening torque load

Summary

Introduction

Dental implants have been constantly evolving through development and research in order to improve the quality of patient care, allowing us to practice a comprehensive and global restorative dentistry, which means obtaining a complete integration between the hard and soft peri-implant tissues [1]. The first osseointegrated implants had an external hexagon design on the implant platform [7] This type of connection has been associated with a certain amount of peri-implant bone loss, especially during the first year of performance [8,9]. Morse taper connection is a conical internal connection that creates a friction between the surfaces that result in cold-welding [14,15] This connection provides a larger surface area of the implant-abutment interface compared to parallel walled connection producing a good seal between its components and less microleakage. The aim of this study was to evaluate the marginal misfit at the implant-abutment interface on external and Morse taper connection, with straight and angulated abutments under different insertion torque loads. The higher the tightening torque applied the increase in the fit of the implant-abutment interface

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