THE EFFECT OF DIFFERENT MODEL TECHNIQUES ON THE MARGINAL GAP OF IMPLANT SUPPORTED FIXED PARTIAL DENTURE

Document Type : Original Article

Authors

1 Associate professor of fixed prosthodontics ain shams university and british university

2 Lecturer of fixed prosthodontics ain shams university

Abstract

Statement of problem: The conventional model fabrication methods have multiple error-introducing steps such as impression, stone setting, waxing and casting; therefore a more reliable and quality controlled method of model fabrication is required
Objective: This research was designed to evaluate the effect of different model fabrication techniques: Conventional stone cast, Rapid Prototyping-3D printing and CAD/CAM on the marginal gap of implant supported fixed partial denture.
Materials and methods: An epoxy resin cast simulating a clinical case with missing lower first mandibular molar was fabricated that served as a master cast from which an optical impression was done to fabricate a 3D printed model and a milled model , and another rubber base impression was done to fabricate a conventional cast, upon these three casts, five three units bridge was fabricated on each model, then marginal gap of implant supported fixed partial denture was evaluated using stereomicroscope.
Results: Two-way ANOVA revealed significant differences were found between the model manufacturing techniques. 3D-printing showed the lowest marginal gap value among all groups

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