ISSN 2320-5407 International Journal of Advanced Research (2014), Volume 2, Issue 9, 686-694 686 Journal homepage: http://www.journalijar.com INTERNATIONAL JOURNAL OF ADVANCED RESEARCH RESEARCH ARTICLE Novel 3D Modeling Technique of Removable Partial Denture Framework Manufactured by 3D Printing Technology Dr. Mostafa Omran Hussein 1 , Dr. Lamis Ahmed Hussein 2 1. Assistant Professor of Prosthodontics, Prosthodontic Department, Faculty of Dentistry, Qassim University Kingdom of Saudi Arabia 2. Assistant Professor of Dental Biomaterials, Dental Biomaterials Department, Faculty of Dentistry, Qassim University Kingdom of Saudi Arabia Manuscript Info Abstract Manuscript History: Received: 25 July 2014 Final Accepted: 29 August 2014 Published Online: September 2014 Key words: Digital RPD manufacturing, RPD 3D modeling, 3D printing, Prototyping. *Corresponding Author Dr.Mostafa Omran Hussein The objective of the present study was to digitize the removable partial denture framework construction using a combination of simplified novel modeling technique and a 3D printing prototyping technology. A partially edentulous stone cast was selected representing mandibular Kennedy class I. The cast was optically scanned using desktop structured light scanner and the generated 3D model data was be exported as STL file then imported to universal reverse engineering software. The cast was digitally surveyed according to the selected path of insertion then all undesirable undercuts were selected, removed and blocked by flat surfaces. A stress releasing design for mandibular class I Kennedy was considered then the components were drawn and cut, as a thin shell, from a 3D model duplicate. Each component was offset outside the 3D model surface to a distance equivalent to its required relief. The framework volume was then created by thickening the shell surface followed by smoothening. Finally, the framework was fine- tuned using sculpt tool. The final framework 3D model was generated layer by layer using the 3D printer machine. The final framework was checked on the stone cast for error and fitness. The final outcome of the current technique produced precise and well-fitted removable partial denture framework using simplified, rapid yet accurate technique of modeling. Copy Right, IJAR, 2014,. All rights reserved Introduction Removable partial denture is an indispensable treatment option for certain situations. Although various materials and techniques were developed in the laboratory dental field, the conventional metallic removable partial denture manufactured by lost wax technique is still used. This old technique is successful however it’s inherited drawbacks. The conventional technique is time consuming, requires multiple steps and technique-sensitive. It should be noted that, more steps used, more chance for errors and ill-fitting denture (Phoenix, et al., 2008). (Rudd & Rudd, 2001a, 2001b, 2001c) reviewed and categorized 243 errors possible during the fabrication of a removable partial denture. Their three-part articles are considered a very good guide for all practitioners, students, and laboratory technicians to review all possible errors and recognize their solutions. They clarified that avoiding errors by good technique is easier than their treatment. In addition, they confirmed that errors are cumulative and so may result to denture remake.