Retention and stability of different implant configurations of four implants supporting mandibular implant overdenture retained by telescopic attachments. In-vitro study.

Aim: this study aimed at evaluation of retention and stability of four implant supported mandibular overdentures retained by telescopic attachments with different configurations. Materials and methods: three acrylic models for edentulous mandibular arch, each of which received four implants in; quadrilateral configuration “model A”, curved configuration “model B” and linear configuration “model C”. Five experimental overdentures (acrylic blocks) were made for each model. Resistance to vertical and oblique (lateral, posterior and anterior) displacement forces were recoded to represent retention and stability respectively with directional pull-test