Dentistry & Oral Care

Biography

Biography: Salah hegazy

Abstract

Purpose: To compare the retentive strengths of thermo-elastic resin versus processed acrylic resin denture base regarding tooth retained and supported mandibular overdenture with different abutment preparations/attachments. Materials and Methods: Eighteen patients with edentulous maxilla and partially edentulous mandibles with two canines remaining. The two canines were endodontically treated, shortened 3-4 mm above the gingival margins; cementation of two long metal copings was done. Patients had two mandibular overdentures fabricated: one with processed acrylic resin denture bases and the other one were fabricated with thermo-elastic resin surrounding the abutment teeth. After two months the abutments were reshaped and shortened to have a dome shaped preparation approximately 1-2 mm above the gingival margins. After another two months patients received two stud attachments. Retention of the overdentures of each abutment preparation was measured after 24 hours and after one month from its insertion date using a digital forcimeter device. Results: There was a statistically significant difference among groups, one day and 30 days after mandibular overdenture (MOD) insertion. The greatest retention values were observed in the tooth retained MOD with long copings group followed by the tooth retained MOD with stud attachments one; the lowest retention values were obtained in the tooth supported MOD with short copings group. The retention values of the thermo-elastic acrylic resin MOD were greater than the processed acrylic resin MOD for all groups. Finally the retention values at one day after MOD insertion were greater than the values after 30 days for processed and thermo-elastic acrylic resin MODs. Conclusion: In this pilot study, the thermo-elastic acrylic resins demonstrated more retention than processed acrylic resin dentures