Metallographic, gas and energy dispersive X-ray analyses of osteosynthesis plates and screws and dental implants removed from patients with clinical indication
Description
The aim of this study was to evaluate the microstructure and chemical composition of dental implants, bone plates and screws removed from patients in cases of clinical indication. In the first study, metallographic, gas and energy dispersive X-ray analyses were performed to evaluate osteosynthesis plates and screws retrieved from 30 patients. The medical records of these patients were evaluated to obtain data regarding age, gender, surgical procedure that had motivated the insertion of osteosynthesis plates and screws, the reason for removal and the period of time of these devices in situ. Forty-eight plates and 238 screws were removed in total. Infection was the main reason for these devices removal, representing 43.3% of cases. Mandible was the main site for plates and screws removal, corresponding to 66.6% of cases. All plates and screws analyzed were within the specifications F67 and F136 of ASTM (American Society for Testing and Materials) according metallographic and energy dispersive X-ray analyses. In gas physical and chemical properties of dental implants analyzed were not associated with failure of these devices.and/or oxygen values above the regulated by ASTM. From the study, it was concluded that the physical and chemical properties of the samples were not associated with the clinical condition that caused the removal of these devices, and retention time of these implants did not determine changes in their properties. In the second study, metallographic and energy dispersive X-ray analyses were performed for evaluation of 38 dental implants removed from 29 patients with clinical indication. Medical records of these patients were evaluated to obtain data regarding age, gender, reason for removal and period of time in situ. Lack of osseointegration without symptomatology or signs of infection was the main reason for dental implants failure, corresponding to 55.1% of cases. Maxilla was the site of implants failure in seventeen patients (58.6%) while twelve patients (41.4%) had failure of dental implants installed in mandible. All dental implants analyzed were manufactured of commercially pure titanium and were within the ASTM F67 specification. From the study, it was concluded that. (author)
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Additional details
Publishing Information
- Imprint Pagination
- 89 p.
- Report number
- INIS-BR--23709
INIS
- Country of Publication
- Brazil
- Country of Input or Organization
- Brazil
- INIS RN
- 52029828
- Subject category
- S36: MATERIALS SCIENCE;
- Resource subtype / Literary indicator
- Thesis
- Quality check status
- Yes
- Descriptors DEI
- BIOLOGICAL MATERIALS; BONE TISSUES; CHEMICAL COMPOSITION; DENTISTRY; IMPLANTS; INFECTIOUS DISEASES; JAW; PLATES; SKELETON; TEETH; TITANIUM; X RADIATION;
- Descriptors DEC
- ANIMAL TISSUES; BODY; CONNECTIVE TISSUE; DIGESTIVE SYSTEM; DISEASES; ELECTROMAGNETIC RADIATION; ELEMENTS; IONIZING RADIATIONS; MATERIALS; MEDICINE; METALS; ORAL CAVITY; ORGANS; RADIATIONS; SKELETON; SKULL; TRANSITION ELEMENTS;