Effect of using soft liner on bone density around the abutments supporting complete lower overdenture.

The effect of lower acrylic overdentures lined with soft liner on bone density around the abutment was studied on 14 patients divided into two equal groups. Group I patients using lower acrylic overdenture lined with soft liner. The abutments selected in each patient were two canines and two posterior. Bone density was measured from periapical radiographs made at denture insertion and after one year of denture use, for each abutments, using an accurate densitometer. The results showed decrease in bone density in the crestal alveolar bone around the abutments through the one year study period. patient using superstructure lined with soft liner showed less bone density than those using acrylic overdenture. The results of these study reached the conclusion that the resiliency of soft liner reduces the load applied over the overdenture abutments and in turn reduces alveolar bone changes.