T- Scan Evaluation of the Effect of Different Soft Liners on the Stresses Transmitted to Mini-Implant Retained Mandibular Overdentures

Abstract

This study was carried out to evaluate the effect of silicon based soft liner versus acrylic soft liner on the stresses transmitted to mini-implant retained mandibular overdenture using T-scan system. Fourteen completely edentulous patients were selected from out clinic of Ain Shams University. All patients were systematically free. Medical and dental history for all patients was recorded. Extra oral examination was carried out to detect any facial disfigurement. Intra oral examination was carried out to detect any signs of inflammation, swelling, or flappy tissue. Radiographic examination to detect any bony pathosis. Conventional complete denture was constructed for all patients. Lower denture was duplicated in a clear acrylic stent to be used as radiographic and surgical stent after that. Panoramic radiograph was taken for all patients to detect the position of mental foramen using the radiographic stent with two metal spheres placed inside. Four holes were made in a surgical stent corresponding to the further position of the four dental implants. The surgical stent was placed in patient mouth and the position of each mini implant was marked using suitable marker. Tissue punch was used to cut out the mucosa at the position of the mini implant marked previously. 1.2mm drill was used to penetrate the bone