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Background Implant success depends both on the tissue biological response and also on several factors such as implant morphology, bone quality and surgical technique.Aim/HypothesisThe aim of this study was to measure primary and secondary implant stability through the resonance frequency analysis of mandibular implants and to evaluate the influence of implant diameter and length, sex, age and site.Material and MethodsThirty-six healthy patients were enrolled for the study. A total of 82 OsseoSpeed TX (Astra Tech Implant System u2013 Dentsply Implants; Mu00f6lndal, Sweden) implants were placed in mandible, with different lengths (9, 11 and 13 mm) and diameters (3,5 and 4 mm). All implants were placed according to a conventional two-stage surgical procedure. Implant stability quotients (ISQ) were recorded at implant placement (ISQ1) and 3 months later, at second surgical stage (ISQ2). Statistical analysis was performed to investigate significant differences between implant dimensions, patient sex and age, and implant position (anterior or posterior sites)(significance =0.05). ResultsSecondary implant stability was statistically significantly higher compared to initial ISQ values (p
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
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.
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
Background: Following the placement of an oral implant, primary mechanical stability is gradually replaced by biological stability. Primary stability is the mechanical engagement of an implant with the surrounding bone, whereas bone regeneration and remodeling phenomena create the secondary (biological) stability of the implant. It is of clinical relevance to know the development of implant osseointegration after installation, as well as to detect the incidence of screw loosening after the implantu2019s superstructure is mounted.Objectives: The aim of this study was to examine the progress of implant osseointegration and screw loosening by means of a resonance frequency analysis (RFA) in the rabbit tibia.Methods: One mature New Zealand White rabbit was used. Six titanium implants were installed in the rabbit tibiae bilaterally. A small 3D-accelerometer was mounted rigidly onto the implant abutment, and impulsive vibration was directly applied to the abutment to vibrate the implant in perpendicular to direction of the tibia and implant (x-axis). Two RFA values of x- and y-axis directions (RFx and RFy) were used for evaluation. The y-axis was defined in parallel to the tibia. Also implant stability was measured by implant stability quotient (ISQ) value with Osstellu00ae. These values were measured immediately after implant placement, twice a week for the first month and once a week for the second month. After 8 weeks, RF values and Peiotestu00ae (PT) values were recorded with 13 different screw conditions, i.e. abutment screw tightened with 10N torque (starting point) and the screw was loosened by 5 degrees from 0 to 90 degrees, and the animal was sacrificed.Results: In most implants, ISQ values tend to decrease until 7 to 10 days after installation and then gradually increased. ISQ values at day 7 and 10 were significantly lower than at other time points, except for two implants which located in the distal side of tibiae. In the RF, no consistent tendency with time was observed among six implants in both directions. According to degree of the screw loosening, the RF and PT values significantly changed (p