View clinical trials related to Prosthesis Failure.
Filter by:The purpose of this study will be to evaluate the effect of direct and indirect pick up of the locator retentive caps and compare the clinical results with those of the manufacturer retentive force.
this project seeks to understand and quantify the effects of powered transtibial prostheses on socket loading and direct measures of residual limb health so as to inform the optimization of prosthesis fit.
Durability evaluation of a new material blend in the Iceform liner and Iceform sleeve.
Regional oral and maxillofacial defects secondary to ablative tissue resection can contribute to severe aesthetic and functional loss, which influences patients' regular life and may cause psychological problems. Microvascular free flaps are considered the gold standard for reconstructing large oral and maxillofacial defects. In the past decade, with the help of computer-aided design (CAD)/ computer-aided manufacturing (CAM) customized implants and prosthesis (CIP) have led to a significant improvement of the operative accuracy, improve the flap survival rate and enhance the patients' quality of life. Concerning the increased overall survival rate of the patients, people pay more attention to the quality of life and aesthetic appearance which are influenced by the fitness and compatibility of the CIP. However, from literature reviews, the evaluation was various to be concluded in some certain conditions from pooled studies.
To assess the influence that the complications of implant treatment have on the patient's perception and satisfaction on treatment.
Newly available ceramic CAD-CAM blocs containing a screw channel for chairside-made crowns to be adhesively cemented to a TiBase abutment and screw-retained to an implant are appealing to the clinician, considering the time efficiency (one appointment) and overall lower costs as no dental laboratory is involved. The hypotheses are that the biological (BOP, PD, PCR, implant bone level) and mechanical outcomes (fracture, loss of retention, wear) are equivalent to implant screw-retained Porcelain-Fused-to-Metal (PFM) crowns over a 5 year observation time.This RCT will provide key information as to the cost/benefit, suitability and/or limitations of these chair-side hybrid-abutment crowns in the posterior region.
Recent data showed that the rate of periprosthetic infections in patients undergoing a hip arthroplasty revision for aseptic loosening is higher than what can be ascertained with conventional methods. The study aims to assess the adequacy of next-generation sequencing of 16s ribosomal ribonucleic acid (rRNA) gene amplicons for identifying occult infections and improving the diagnostic workup. Moreover, additional testing has been planned in order to increase knowledge on the etiopathogenesis of infection.
Implant placement in the posterior maxilla is compromised due to atrophy of the alveolar process and maxillary sinus pneumatisation. Bone augmentation is frequently necessary before or in conjunction with implant placement. The most commonly used method to augment the posterior maxillary involves maxillary sinus floor augmentation (MSFA) with autogenous bone graft or bone substitute. Autogenous bone graft harvesting is associated with risk of donor site morbidity and unpredictable resorption of graft. Thus, bone substitutes alone or in combination with autogenous bone are used increasingly to simplify the surgical procedure. Symbios biphasic biomaterial is a resorbable inorganic bone forming material derived from red algae consisting of 20% hydroxylapatite and 80% β-tricalciumphosphate with osteoconductive properties. Histologic and radiographic examinations indicate that β-tricalciumphosphate is slowly resorbed and replaced with bone. MSFA with β-tricalciumphosphate alone or in combination with autogenous bone or other bone substitutes have demonstrated high implant survival and new bone. Symbios xenograft granules is a porcine bone mineral with osteoconductive properties. Histologic and radiographic examinations indicate that xenograft is a non-resorbable graft material. MSFA with xenograft alone or in combination with autogenous bone have shown high implant survival and new bone. The objective is to test the H0-hypothesis of no difference in implant outcome after MSFA with autogenous bone graft or in combination with Symbios biphasic biomaterial or Symbios xenograft. 60 consecutively healthy patients with a missing posterior maxillary tooth/teeth will be randomly allocated to: 1) MSFA with autogenous bone graft, 2) MSFA with mixture of 50% autogenous bone graft and 50% Symbios biphasic biomaterial 3) MSFA with mixture of 50% autogenous bone graft and 50% Symbios xenograft. Implants will be inserted simultaneously with MSFA. Clinical and/or radiographical evaluation using periapical radiographs and Cone Beam Computer Tomography will be performed preoperatively, immediate postoperatively, before abutment connection, after prosthetic rehabilitation, and after one year to assess the treatment outcome and volumetric changes of the augmented area. Outcome include survival of suprastructures and implants, volumetric stability of graft, peri-implant marginal bone level, oral health related quality of life, and complications.
A retrospective consecutive population of patients treated with conical tapered stems in cementless total hip arthroplasty for osteoarthritis due to congenital hip pathologies will be selected. The aim of this retrospective study is to evaluate the long-term clinical and radiographic results of this implant and the survival rates in such a specific cohort.
Implant placement in the posterior part of the maxilla is frequently compromised or impossible due to atrophy of the alveolar process and pneumatisation of the maxillary sinus. Therefore, alveolar ridge augmentation is frequently necessary before or in conjunction with implant placement. The most commonly used method to augment the maxillary premolar and molar region involves the maxillary sinus floor augmentation applying the lateral window technique with a grafting material. However, the lateral window technique is associated with prolonged patient treatment time and increased morbidity. Thus, osteotome-mediated sinus floor elevation (OSFE) with or without the use of a grafting material has been advocated, when the residual bone height is more than 6 mm. OSFE involves preparation of implant site through the use of concave osteotomes and elevation of the maxillary sinus floor. The survival of suprastructure and implants after OSFE with or without the use of a grafting material has never been assessed in long-term randomized controlled trials. A long-term study concluded that OSFE with no grafting material is a predictable treatment modality. High short-term implant survival rates after OSFE with or without the use of a grafting material have been reported in systematic reviews. However, the amount of new bone formation after OSFE with the use of a grafting material is significantly higher compared to the use of no grafting material, as documented in a systematic review. Harvesting of autogenous bone graft is associated with risk of donor site morbidity and bone substitutes of natural transplants involves a risk of contamination, activation of host immune system and disease transmission as well as they can be refused by patients for religious reasons or because they are in contrast with chosen lifestyle. Therefore, the objective of the present study is to test the H0-hypothesis of no difference in the long-term implant treatment outcome after OSFE with Bio-Oss Collagen compared with the use of no grafting material. A total of 40 consecutively healthy patients with a missing posterior tooth in the maxilla will be allocated at random to OSFE with Bio-Oss Collagen or no grafting material and simultaneous implant placement. Clinical and/or radiographical evaluation using periapical radiographs and Cone Beam Computer Tomography (CBCT) will be performed preoperatively, immediate postoperatively, after abutment connection, after prosthetic rehabilitation, one year, three years and five years after loading to assess the long-term implant treatment outcome and the volumetric changes of the augmented area. The primary outcome will include survival of suprastructures, survival of implants, volumetric stability of the augmented area, peri-implant marginal bone level, oral health related quality of life, and complications related to the two treatment modalities.