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Adhesive Wear Assessment of the Prosthetic Abutment and Detorque Values of Conical Connection Implants with Different
Purpose:
Morse taper connection presents better functional load distribution than other types of connections. The angle and finishing surfaces are used to prevent components from loosening under direct axial load. The angulation of the connection walls for the Morse effect to exist should be from 6° to 16°. Therefore, there is a lack of consensus regarding the most appropriate conical connection from both biological and mechanical perspectives. This study aimed to evaluate the influence of different conicities (10°, 16°, 22°, and 24°) of implants with conical connections on the adhesive wear of the prosthetic abutment after the application of the tightening torque.
Materials And Methods:
Twenty implant sets, abutment with different conicities (10, 16, 22, and 24 degrees) were analyzed using five implants and five abutments, divided into four groups according to the taper angle: A-10° (Emfils, São Paulo Brazil); A-16° (SIN, Sao Paulo, Brazil); A-22° (Nobel Biocare, Zurich, Switzerland); and A-24° (Conexão Sistema de Prósteses, São Paulo, Brazil). The 20 implants were installed in specimens with a stability of 60N·cm, and their respective abutments were subjected to an installation torque of 32N·cm. After being subjected to the recommended torque, the abutments were subjected to detorque for scanning electron microscopy (SEM) analysis. The images obtained of the prosthetic abutments were delineated.
Results:
The adhesive wear areas outlined in the ImageJ and values of detorque were analyzed. After statistical analysis of the data, it was observed that group A-24° presented a higher detorque value compared to the other groups (p<0.05). In contrast, the others did not show significant differences among them (p>0.05). For the adhesive wear score, it was observed that group A-16° presented the highest adhesive wear scores, with a statistically significant difference compared to group A-10° (p<0.05). For the other conicities, no difference was observed (p>0.05).
Conclusion:
It is possible to conclude that the conicity of 16° presented a higher adhesive wear score after tightening the torque of the prosthetic abutment.
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