الفهرس 
Surface characteristics of the implantOnly 14 pages are availabe for public view
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Abstract
This study was carried out to compare clinically, radiographically and the microbiological flora between the Polymethylmethacrylate and thermoplastic nylon as denture base material for implant assisted overdenture. Twenty-one completely edentulous male patients were selected from the out- patient clinic of Prosthodontic Department, Faculty of Dentistry, Tanta University. All patients were completely edentulous, with age ranged between 40-65 years, with normal maxilla-mandibular class I Angle’s classification relationship with enough inter-arch space at least 12mm from soft tissue, they were systemically free. The bone height was not less than 17 mm and the labiolingual width is not less than 6 mm at the mandibular prospective implant site. All patients received 2 implants in the canine region of the mandible and flapless surgical technique with surgical stent were used for implant placement. Dentium implant system was used. All implants of 14mm.length and 3.8mm.diameter. After healing period patients were received the ball attachment then randomly classified into three groups, seven patients each. group (I): patients received a conventional maxillary denture and a mandibular implant assisted overdenture constructed from PMMA. group (II): patients received a maxillary conventional complete denture and a mandibular implant assisted complete overdenture constructed from thermoplastic nylon. group (III): patients received a maxillary conventional complete denture constructed from PMMA and the mandibular implant assisted complete overdenture constructed from thermoplastic nylon. Patients were instructed for overdenture use and preservation of denture hygiene following strict oral hygiene measures. In each group, each patient was evaluated clinically, radiographically and patient satisfaction at time of denture insertion then at 6 months, 12 months and 18 months following overdenture insertion. Also microbiological evaluation was done at the same intervals to identify the microorganisms for both the denture base materials. At the end of the study, all the implants of the three groups were successfully osseointegrated. There was no statistically significance difference between the groups as regards to clinical (patient satisfaction, gingival recession, pocket depth and implant stability by Osstell ISQ) and radiographic evaluation by digital periapical and panoramic radiograph. On the other hand there was significant difference within the same group during the follow up period except in the implant stability that reveal that there was no statistically difference in the same group during the follow up period. Based on the limitations of the present study, it can be concluded that: • Nylon denture base material shows satisfying results in its effect on the implant in implant assisted overdenture that appear in the clinical and radiographic evaluation results. • Nylon is better to be used as alternative to PMMA as denture base material for implant assisted overdenture.