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BACKGROUND: Resonance frequency analysis (RFA) is a simple, practical, reproducible, clinically feasible and non-invasive method that allows to safely assess the degree of stiffness that the implant is within the bone structure. AIM: According to the applied methodology, the aim of this clinical study was to perform a research to evaluate the stability of two different types of implants, with resonance frequency analysis (RFA). METHODS AND MATERIALS: This clinical research was approved by the ethical committee (Plataforma Brasil) under the number CAEE 54726816.6.0000.5374. Patients were submitted to conventional dental implant surgery with installation of two implants, Straumannu2019s, Bone Level Tapered (BLT) 4x8mm and SINu2019s Unitite 4x8,5mm. Each patient received two implants, one from each brand, with their respective healing abutments. The stability of the implants (ISQ) was measured by the Osstell apparatus. A torque of 10Ncm was applied to the smartpegs. The stability of the implants was measured at the time of surgery, four, six and eight weeks post-surgery. At each stage, three measurements were taken and a mean (mean ISQ) was obtained for each implant. RESULTS: Each group (SINu00ae and Straumannu00ae) was treated, separately, with ANOVA and the differences found identified by Tukey-Kramer multiple comparisons test. The Straumann implants show no statically difference in the ISQ values for all measurements. The SIN group showed only a statistically lower ISQ value in the 4 week. The two groups were compared in all stages with a paired t-test. The ISQ values u200bu200bfor the Straumann groups were statistically higher in all stages (P
The use of dental implants in the rehabilitation of partially and completely edentulous patients has been significantly increased in recent years. Although high survival rates of implants supporting prosthesis have been reported, failure still happens due to bone loss as results of primary and secondary implant stability. Primary stability of an implant mostly comes from mechanical interaction with cortical bone while secondary stability happens through bone regeneration and remodelling at the implant/bone interface. Defining the implant stability remains a challenge in dentistry and several researches have been made in this field. To detect implant stability, various diagnosis analyses have been employed. Among them, resonance frequency analysis (RFA) is an objective method of monitoring implant/tissue integration. In this thesis, experimental and numerical studies are carried out to find the effect of some parameters affecting the stability of dental implant by using RFA. Modal analysis technique is employed to investigate the effect of coupled mode shapes in dental implant. Moreover, the primary stability of dental implant that indicates the process of bone-implant integration is investigated. Resonance frequency of jaw-implant structure is carried out using finite element modelling. Different implant-bone interface conditions are studied for this investigation. The effects of endosseous implant angulation on the resonance frequency of implant are studied. MIMICS, a three dimensional (3D) modelling software was used to construct a 3D model of a pig mandible from computed tomography (CT) images. The resonance frequency of the implant was analyzed using finite element (FE) modal analysis in a simulated environment. The MIMICS is also used to investigate effect of soft tissue surrounding the implant on the RF of implant. In addition, three different pig mandibles were employed to assess the effect of some parameters affecting resonance frequency of implant. Finally, experimental studies are carried out to investigate the effect of soft tissue on RF of implant. A novel device is also designed for stability analysis of dental implants.
Assessment of implant stability by resonance frequency analysis in anterior and posterior segments of mandibulary edentuolus ridgesOne of the most important inventions in modern dentistry are dental implants. The process of osteointegration is a result of the initial mechanical stability complemented with biological stability. Osstell device was invented to measure the stability of dental implants at any time of the treatment.Aim/Hypothesis: The aim of this study was to analyze the implant stability quotient (ISQ) results of the resonance frequency (RF) in anterior and posterior segments of the lower jaw at the first day of placement of dental implants and 3 months after the surgery.Materials and Methods: This study was approved by forty patients with total or partial edentulous mandibular jaws underwent with 76 dental implants. The ISQ values were measured at the day of surgery and 3 months after placement. Osttell Mentor device was used to measure the RF value of the implant fixture through the transducer or pin. Measurements were taken four times in each direction of inserted oral dental implant.Results: The ISQ primary stability at the day of surgery had a mean value of 63.81 (SD 9.48) for dental implants in anterior segment of lower jaw and the secondary stability was 70.25. The mean ISQ of primary stability of the posterior segments of lower jaw was 63.89 (SD 6,99) while the secondary stability 69.43. Differences between primary and secondary mean ISQ values were statistically significant (p
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