EFFECT OF DIFFERENT IMPLANTS POSITIONS AND NUMBER ON RESISTANCE OF MANDIBULAR POLYURETHANE REPLICAS TO FRACTURE | ||
| Alexandria Dental Journal | ||
| Article 1, Volume 46, Issue 3, December 2021, Pages 85-91 PDF (1.4 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/adjalexu.2021.205698 | ||
| Authors | ||
| Basem Tarek abdelaziz abdelmoaty Fadl* 1; Mohamed S. El-Attar2; Ingy S. Soliman3; Mohamed A. Abu Saied4 | ||
| 1Removable Prosthodontic Department, Faculty of Dentistry, Alexandria University, Alexandria, Egypt. | ||
| 2Professor of Prosthodontics, Removable Prosthodontic Department, Faculty of Dentistry, Alexandria University, Egypt.President of Alexandria Oral Implantology Association (AOIA), Egypt. | ||
| 3Lecturer of Prosthodontics. Removable Prosthodontic Department Faculty of Dentistry Alexandria University, Egypt. | ||
| 4Associate Professor Polymer Materials Research Department, Advanced Technologies, and New Materials Research Institute (ATNMRI), City of Scientific Research and Technology Applications | ||
| Abstract | ||
| Introduction: Many case reports and retrospective studies related implant placement to mandibular weakness and fracture. Objectives:This study aimed to investigate the effect of number and positions of dental implants on structure integrity of completely edentulous mandible. Material and Methods:Thirty-two synthetic edentulous polyurethane mandibles were divided in 4 groups: First group (I) was unaltered eight fully intact replicas representing control group acting as reference. Second group (II) was eight replicas where only single symphysial implant was placed representing single implant group. Third Group (III) was eight replicas with inserted double implants in canine area representing double implant group, while fourth group (IV) was eight replicas with inserted triple implants (two implants in premolar area, one implant in symphysis) representing triple implant group. Vertical loads were simulated by universal testing machine under conditions simulating trauma, with a compression force acting laterally on the ramus of the mandible with displacement rate up of 5 mm/min until failure. The primary outcome variable was maximum load to failure. Other outcome variables were Fracture locations and displacement to failure. Scanning electron microscope was utilized to evaluate the changes in the implant surfaces in fracture sites. Results: the results of this study revealed that there were significant differences in Maximal failure loads and fracture location across all groups [P = 0.02, P < 0.0001, respectively]. Conclusion:It was assumed from this study that placement of dental implant in canine positions disturbed structure integrity of intact mandibles and acted as point of weakness. | ||
| Keywords | ||
| Implant Positions; Implant overdenture; Fracture Resistance; Trauma; Mandibular fracture | ||
| References | ||
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