Clinical oral implants research
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Clin Oral Implants Res · Nov 2014
Comparative StudyMandibular bone loss in ewe induced by hypothalamic-pituitary disconnection.
It is supposed that the demographic change will lead to an increase in patients with impaired alveolar bone conditions. Large animal models are of particular interest in this context as they are suitable for developing and testing new dental implants. Recently, we demonstrated that surgical hypothalamo-pituitary disconnection (HPD) causes a pronounced low-turnover situation leading to cortical and trabecular bone loss in sheep. In this study, we aimed to investigate the influence of the HPD procedure on the alveolar bone. ⋯ Our results underline the importance of central regulatory mechanisms of bone turnover. However, further studies are needed to understand these central regulatory elements of bone turnover in detail and to judge the value of the HPD sheep for dental research.
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Clin Oral Implants Res · Aug 2013
Comparative StudyThe reliability of cone-beam computed tomography to assess bone density at dental implant recipient sites: a histomorphometric analysis by micro-CT.
The aim of this study was to objectively assess the reliability of the cone-beam computed tomography (CBCT) as a tool to pre-operatively determine radiographic bone density (RBD) by the density values provided by the system, analyzing its relationship with histomorphometric bone density expressed as bone volumetric fraction (BV/TV) assessed by micro-CT of bone biopsies at the site of insertion of dental implants in the maxillary bones. ⋯ RBD assessed by CBCT has a strong positive correlation with BV/TV assessed by micro-CT at the site of dental implants in the maxillary bones. Pre-operative estimation of density values by CBCT is a reliable tool to objectively determine bone density.
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Inferior alveolar nerve (IAN) is the most commonly injured nerve (64.4%) during implant treatment. At present, no standardized protocol exists for clinicians to manage IAN injury related with implant surgery. Therefore, the purposes of the present article were to analyze the reasons for nerve injury and to propose guidelines in managing IAN injury. ⋯ The most frequent (50%) risk factor for IAN injury was intraoperative bleeding during bone preparation. The most common (56.3%) etiological risk factor of nerve injury was dental implant. A six-step protocol aimed at managing patients with IAN injury, during dental implant surgery, was a useful tool that could provide successful treatment outcome.
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Clin Oral Implants Res · Jan 2012
Flapless, CBCT-guided osteotome sinus floor elevation with simultaneous implant installation. I: radiographic examination and surgical technique. A prospective 1-year follow-up.
Survival rates of implants placed in transalveolar sinus floor augmentation sites are comparable with those placed in non-augmented sites. Flapless implant surgery can minimize postoperative morbidity, alveolar bone resorption and crestal bone loss. The use of cone beam computerized tomography (CBCT) provides 3D presentations with reduced dose exposure. ⋯ Flapless transalveolar sinus lift procedures visually guided by preoperative CBCT can successfully be used to enable placement, successful healing and loading of one to three implants in residual bone height of 2.6-8.9 mm. There was no marginal bone loss during the 3-12 months follow-up.
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Clin Oral Implants Res · Nov 2011
Comparative StudyGuided bone generation in a rabbit mandible model after periosteal expansion with an osmotic tissue expander.
To evaluate the space-maintaining capacity of titanium mesh covered by a collagen membrane after soft tissue expansion on the lateral border of the mandible in rabbits, and to assess bone quantity and quality using autogenous particulate bone or bone-substitute (Bio-Oss(®) ), and if soft tissue ingrowth can be avoided by covering the mesh with a collagen membrane. ⋯ This study confirms that an osmotic soft tissue expander creates a surplus of periosteum and soft tissue, and that new bone can subsequently be generated under a titanium mesh with the use of an autologous bone graft or DBBM.