The effects of superstructure fit and loading on individual implant units: Part I. The effects of tightening the gold screws and placement of a superstructure with varying degrees of fit.
This in vitro study investigated forces associated with the assembly of rigidly mounted Nobelpharma implants and a 'passively' fitting cast gold superstructure. The effects of modifying the fit by 10-110 micrometers were also investigated. Measurements were made using linear resistance strain gauges mounted longitudinally on the abutments. Tightening the gold screws produced high compressive strains. These were unevenly distributed, and inconsistent. Tensile strains were produced by gaps as small as 10 micrometers between the superstructure and an abutment while the ability of a torque of 10 N-cm in the gold screw to close the gaps was dependent on their dimensions and locations.
Isa
Z M
ZM
Department of Prosthetic Dentistry, Eastman Dental Institute for Oral Health Care Sciences, London, UK.
Hobkirk
J A
JA
D000044:Dental Abutments; D015921:Dental Implants; D017267:Dental Prosthesis Design; D017268:Dental Prosthesis Retention / Q000295:instrumentation*; D019094:Dental Prosthesis, Implant-Supported; D003799:Dental Stress Analysis / Q000379:methods; D006801:Humans; D010865:Pilot Projects
D015921:Dental Implants