Vertical Discrepancy in Height of Morse Cone Abutments Submitted to Different Torque Forces.

Bruno Q S Cordeiro,Mylena D Moreno,Edgard M Fonseca,Valquiria Quinelato,Priscila L Casado,Carlos Fernando De Almeida Barros Mourão,Cintia C.P Martins,Waldimir R Carvalho,Pietro Montemezzi,Kayvon Javid

doi:10.3390/ma14174950

Bruno Q S Cordeiro, Mylena D Moreno + Show 8 more

Open Access

https://doi.org/10.3390/ma14174950

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Abstract

The present study aimed to evaluate the influence of manual torque (10 Ncm) versus clinical torque (30 Ncm), which is recommended by the manufacturer, on the total length of morse cone implant abutments. Twenty specimens were prepared and distributed into two groups: group 1 with ten analogs for morse cone type implant, and group 2 with ten morse type implants, size 4.3 × 15 cm. In each group, the distance between the implant platform to the top of the prosthetic abutment (abutment height) was measured and subjected to a torque of 10 Ncm. Then, the 30 Ncm torque was applied to the same abutment, and abutment height was measured. The distance between the top of the abutment and the implant/analog base was measured. In order to verify the clinical reproducibility of the experiment, comparisons between the abutment height of the analog at 10 Ncm and the implant at 30 Ncm were performed, showing a greater discrepancy in torque for the 10 Ncm analog (p < 0.05). In order to verify if the change in the laboratory protocol from 10 to 30 Ncm could minimize the differences in the height of the prosthetic abutments, the abutment height in groups 1 and 2 was compared with 30 Ncm, and no significant difference was observed (p > 0.05). The data indicated that the manual torque and the torque recommended by the manufacturer influence the total length of the prosthetic abutments of morse cone implants.

Highlights

Among many factors, the success of implant-supported rehabilitations depends on the configuration of the connection between the abutment and the implant platform, as it influences the stability of the prosthesis, the mechanical strength of the implant, and the prosthetic components [1]
In order to verify if the change in the laboratory protocol from 10 to 30 N could minimize the differences in the heights of the prosthetic abutments, the analog base (A–B) distance between the analogs (30 N) and implants (30 N) was compared
This work aimed to evaluate the influence of manual torque force and the force recommended by the manufacturer on the total lengths of morse cone implant abutments

Summary

Introduction

The success of implant-supported rehabilitations depends on the configuration of the connection between the abutment and the implant platform, as it influences the stability of the prosthesis, the mechanical strength of the implant, and the prosthetic components [1]. The fit of an implant abutment superstructure, without any interference from manual torque during prosthesis confection to final torque, is essential to the success of the prosthesis [3] In this context, a source of error when using an internal implant connection could arise from the level of the tightening torque applied to the prosthesis parts by the laboratory technician compared to that applied by the clinician in oral cavity [3]. A source of error when using an internal implant connection could arise from the level of the tightening torque applied to the prosthesis parts by the laboratory technician compared to that applied by the clinician in oral cavity [3] This topic is not clearly addressed in the current literature, and information on the laboratory and clinical differences of prosthetic components of implants is still limited, requiring further studies in order to clarify and minimize prosthesis misfit

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