[Introduction of a technique for fabrication of an implant-supported fixed temporary prosthesis]

In fully edentulous patients, reconstruction with implant-supported fixed prosthesis is a complicated treatment. In conventional technique, after the placement of the implants, fixed temporary prosthesis is fabricated with no consideration of the removable prosthesis that the patient has used yet. Therefore, the logical relation of the phases of treatment is lost and the points such as vertical dimension occlusion and centric relation are not recorded exactly. The purpose of this article is to introduce a technique in which a fixed temporary prosthesis is fabricated by use of patient's full denture. In this study, a 60-year-old patient with complete edentulous in the mandible was referred to Dental School. He has used a complete jaw denture in the mandible. The complete denture especially in the lower jaw has caused destructions to the remaining ridge. Due to the patient's condition and the existing circumstances, the treatment design of implant-supported fixed prosthesis was accepted by the treatment team. Prior to the surgery, assessments of the bone quality and quantity, force factors, the number of the implants, their lengths and angles were done and the complete denture was converted to implant-supported fixed temporary prosthesis. The fabrication of conversion prosthesis was introduced with implant-supported metal ceramic restoration

[Fabrication of implant-supported ear prosthesis: report of a case]

Restoration of facial lesions has been always difficult for prosthodontists. Extraoral facial prosthesis are faced with apparent limitations such as base removable tissue, lack of large-sized prosthesis and intolerance by the patients. The use of implants may lead to a decrease in these limitations. The implant-induced retention can replace the largesized prosthesis in removable tissue bases and then, the attention may be focused on prosthesis esthetics only. The present study reports a case of implant - supported ear prosthesis with trauma history referring to Removable Prosthodontics Department of Dental School, Shaheed Beheshti University of Medical Sciences

[Marginal discrepancy in two kinds of finishing line for full veneer crown prior to porcelain application [simulation method]]

One of the most important criteria for clinical acceptance and longevity of cast restorations is marginal accuracy. Marginal discrepancy causes cement layer exposure, increases risk of cement wash out leading to plaque accumulation, recurrent caries and gingival tissue inflammation. This study assessed the effect of finishing line preparation design on marginal discrepancy. In this experimental invitro study, three metal dies were prepared using simulation method with beveled shoulder, chamfer and combination of both [buccal beveled shoulder encounters palatal chamfer] that addressed groups A, B and C respectively. Seven wax patterns for each die were cast in Wiron 99 [Basemetal Alloy]. After seating the frameworks, marginal discrepancy was measured in two horizontal and vertical dimensions. The data were analyzed by one way ANOVA and Tukey multiple comparisons tests. The significant differences of horizontal marginal opening were found among three groups in buccopalatal and mesiodistal directions [P<0.003, P<0.0001]. Also, significant differences found between pair groups except to A and C in buccopalatal and A and B in mesiodistal directions. The vertical marginal opening in three groups was statistically different at mesial, distal and palatal directions [P<0.05] but not at buccal side. The vertical marginal opening differences of pair groups [A and C, B and C] at mesial, distal and palatal directions were significant [P<0.05]. Within the limitation of this study, finishing line, preparation design significantly affects the marginal discrepancy, the least and most horizontal marginal opening was produced in beveled shoulder and the combined preparation of beveled shoulder and chamfer, respectively. Chamfer preparation caused minimum vertical marginal opening while the beveled shoulder was in the next rank with no significant statistical differences