Photoelastic Stress Analysis for Cobalt Chromium and Nylon Denture ‎Base on Mandibular Kennedy Class I Implant Supported Removable ‎Partial Overdenture

Document Type : Original Article

Authors

1 Department of Removable Prosthodontics, Faculty of dentistry, Sinai university, El Arish city, North Sinai, Egypt

2 Removable Prosthodontics department Faculty of Dental Medicine, Boys, Al-Azhar University, Cairo, Egypt

3 Removable Prosthodontics department, Faculty of Dentistry, Sinai University, sinai, Egypt

Abstract

Objective: the object of this study was to evaluate stresses induced on implant supported ‎cobalt chromium and nylon overdenture bases in free end saddles cases using photoelastic ‎stress analysis. Materials and Methods: Ready-made mandibular stone cast fabricated ‎according to Kennedy Class I with missed 2nd premolar, 1st and 2nd molars. Implant analogue ‎was inserted at site of first molar by using milling machine. Closed tray silicone impression ‎was taken to the stone cast after transfer coping insertion. The transfer coping was inserted on ‎its place in the impression. The implant was placed on its position in the impression. The ‎impression was poured by epoxy resin material and left 24 hour for complete setting. Metallic ‎denture base and nylon denture base was constructed in same design. Forces of 20N, 40N, ‎‎60N, 80N, 100N were applied to detect photoelastic stresses. Results: at application of loads ‎‎(80N and 100N) the nylon framework recorded higher stress values than that of vitalium ‎framework at apical, middle and cervical area for left and right sides. Conclusion: Cobalt ‎chromium denture base showed better stresses distribution in comparison to nylon denture ‎base.‎

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Al-Azhar Journal of Dental Science
Volume 25, Issue 2 - Serial Number 2
April - Restorative Dentistry Issue (Removable Prosthodontics, Fixed Prosthodontics, Endodontics, Dental Biomaterials, Operative Dentistry)
April 2022
Pages 119-125

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