A Clinical Study to Assess the Pressure of the Removable Part of the Precision Attachments on the Soft Tissues in Cases of Kennedy Class II

This study aimed to evaluate the pressure exerted on mandibular soft tissues by the removable components of two different extracoronal precision attachment systems in distal extension cases (Kennedy Class II). A total of 10 patients presenting with bilateral mandibular edentulous areas were included. The first and second premolars were prepared as abutment teeth. A rigid attachment system (MK1) was applied on one side, while a resilient attachment system (ASC 52) was placed on the opposite side. Pressure measurements were obtained immediately after prosthesis placement and after six months of function. Small perforations were created in the removable components at both proximal and distal points. These areas were analyzed using an optical microscope connected to a digital imaging system, allowing measurements in microns. The findings indicated no statistically significant differences between proximal and distal points in both attachment systems immediately after insertion. However, after six months, significant differences were observed in the rigid attachment system (MK1), particularly at distal points. Within the limitations of this study, resilient attachment systems demonstrated a more favorable pressure distribution on soft tissues compared to rigid attachment system.