title: Force transmission in bar-retained implant-stabilised mandibular over-dentures: an in-vitro study.
abstract: The effects of attachment clips on force transmission in two implant-stabilised over-dentures with cantilever extensions were investigated, using a previously developed in-vitro model, which simulated functional mandibular deformation. Two retentive configurations were used: an avoid gold bar cranked anteriorly with 13 mm distal cantilevers and the same configuration without attachment clips on the distal cantilevers. The dentures were loaded at individual tooth positions with a strain gauge beam and the forces exerted on the implants were measured using strain gauges mounted on their trans-mucosal abutments. The difference between the two retentive configurations was significant (P < 0.05) as tested by ANOVA. It is concluded that the retentive configuration without clips on the distal cantilevers results in a significant decrease in compressive forces on the implants.
authors.affiliation: Department of Prosthetic Dentistry, Eastman Dental Institute for Oral Health Care Sciences, University College London, 256 Gray's Inn Road, London WC1X 8LD, UK. J.hobkirk@eastman.ucl.ac.uk
authors.forename: Ali M
authors.initials: AM
authors.lastname: el-Sheikh
authors.forename: John A
authors.initials: JA
authors.lastname: Hobkirk
mesh_terms: D000704:Analysis of Variance; D000044:Dental Abutments; D003724:Dental Arch / Q000502:physiology; D015921:Dental Implants; D019094:Dental Prosthesis, Implant-Supported; D003819:Denture Bases; D003779:Denture Design; D003781:Denture Retention; D003826:Denture, Complete, Lower; D003828:Denture, Overlay; D006047:Gold Alloys / Q000737:chemistry; D006801:Humans; D008334:Mandible / Q000502:physiology*; D008953:Models, Anatomic; D013314:Stress, Mechanical; D013499:Surface Properties; D014159:Transducers; D016474:Weight-Bearing
chemical_list: D015921:Dental Implants; D006047:Gold Alloys