Comportamento de diferentes chaves de torque usadas em prótese sobre implantes

Abstract

Introduction: Torque wrenches are indispensable in a prosthetic oral rehabilitation with dental implants. There are several types of manual torque wrenches, of which toggle-style and spring-style stand out. The main objective of this research was to analyze and evaluate the mechanical behavior of two different torque wrenches used in a prosthetic oral rehabilitation with dental implants. Materials and Methods: A laboratory study was carried out to test the mechanical behavior of two torque wrenches with different dynamometric systems, spring-style and toggle-style. For each torque wrench it was prepared 3 working tables with an analogue, straight standard abutment and straight screw. For each torque wrench, 30 tightening/loosening cycles were performed for the pre-selected values, 10, 20 N.cm and 35 N.cm, and recorded the value measured by a torque measurement cell. A descriptive and inferential statistical analysis was carried out. Results: According to the average, both presented values lower than the pre-selected torque, showing significantly different results. The same can be confirmed according to the toggle-style and spring-style systems, since both proved to be significantly different. Toggle-style was always inferior to spring-style. However, according to the variance, the two torquemeters showed similarities, thus having a similar torque dispersion between them. Conclusion: Within the limitations of this research, it can be concluded that the analyzed torque wrench systems presented inferior values to those pre-selected. Also, the type of dynamometric system can also give different torque values.

Date of Award	15 Jul 2022
Original language	Portuguese
Awarding Institution	Universidade Católica Portuguesa
Supervisor	André Correia (Supervisor) & Filipe Miguel Araújo (Co-Supervisor)