Influence of the distance between the implant in retention force, fatigue resistance and wear characteristics of the O-ring attachment system used in mandibular overdentures

Abstract

Several factors may influence the retention force and its wear characteristics of the attachment system under function, such as the angle and distance between implants. Objectives: To evaluate the influence of the distance between the implants (22 mm, 29 mm) in the attachment system (O-ring) in retention force, fatigue resistance and wear characteristics of the o-ring attachment system. Methodology: 12 specimens will be made to assess the retention strength and fatigue resistance, which are divided into 2 groups according to the distance. The samples will be tested for mechanical fatigue using a testing machine MTS 810 - Material Test System during 5500 cycles of insertion and removal (f = 0.8 Hz), immersed in artificial saliva. Retention values will be obtained for 4 periods (0, 1500, 3000, 5500 cycles) using a load cell of 10 kN and a constant speed of 1mm/min. A specimen of each group will be selected and analyzed by a scanning electron microscope for qualitative evaluation of the surface in order to identify any changes that may have occurred during testing, in the attachment used. (AU)