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KMID : 1004520130290030224
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Journal of Dental Rehabilitation and Applied Science
2013 Volume.29 No. 3 p.224 ~ p.235
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The Effects of Screw Retained Prosthesis Misfit & Cantilever on Stress Distribution in Bone Around the Implant
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Lee Jae-In
Kim Tae-Young
Cho Hye-Won
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Abstract
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A passively fitting prosthesis is an essential prerequisite to attain long-lasting success and maintenance of osseointegration. However, true "passive fit" can not be achieved with the present implant-supported prosthesis fabrication protocol. Many clinical situations are suitably treated with cantilevered implant-supported fixed restorations. The purpose of this study was to compare the stress distribution pattern and magnitude in supporting tissues around ITI implants with cantilevered, implant-supported, screw-retained fixed prosthesis according to the fitness of superstructures. Photoelastic model was made with PL-2 resin (Measurements, Raleigh, USA) and three ITI implants (ø4.1×10 mm)were placed in the mandibular posterior edentulous area distal to the canine. Anterior and posterior extended 4-unit cantilevered FPDs were made with different misfit in the superstructures. 4 types of prosthesis were made by placing a 100 ㎛ gap between the abutment and the crown on the second premolar and/or the first molar. Photoelastic stress analysis were carried out to measure the fringe order around the implant supporting structure under simulated loading conditions (30 lb).
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KEYWORD
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Cantilever, Photoelastic analysis, Screw retained fixted prosthesis
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