Impact of Scala Tympani Geometry on Insertion Forces during Implantation (original) (raw)
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Influence of high insertion torque on implant placement: an anisotropic bone stress analysis
Brazilian Dental Journal, 2010
The aim of this study was to evaluate the influence of the high values of insertion torques on the stress and strain distribution in cortical and cancellous bones. Based on tomography imaging, a representative mathematical model of a partial maxilla was built using Mimics 11.11 and Solid Works 2010 softwares. Six models were built and each of them received an implant with one of the following insertion torques: 30, 40, 50, 60, 70 or 80 Ncm on the external hexagon. The cortical and cancellous bones were considered anisotropic. The bone/implant interface was considered perfectly bonded. The numerical analysis was carried out using Ansys Workbench 10.0. The convergence of analysis (6%) drove the mesh refinement. Maximum principal stress (σ max ) and maximum principal strain (ε max ) were obtained for cortical and cancellous bones around to implant. Pearson's correlation test was used to determine the correlation between insertion torque and stress concentration in the periimplant bone tissue, considering the significance level at 5%. The increase in the insertion torque generated an increase in the σ max and ε max values for cortical and cancellous bone. The σ max was smaller for the cancellous bone, with greater stress variation among the insertion torques. The ε max was higher in the cancellous bone in comparison to the cortical bone. According to the methodology used and the limits of this study, it can be concluded that higher insertion torques increased tensile and compressive stress concentrations in the periimplant bone tissue.
The International Journal of Oral & Maxillofacial Implants
Primary implant stability represents the first step for successful osseointegration. The knowledge of the correlation between host bone density, insertion torque, and implant macrogeometry seems to be fundamental to achieve sufficient primary implant bone fixation in each clinical situation. The purpose of this study was to measure, in vitro, the impact of dental implant macrogeometry and insertion torque values on primary stability in relation to different bone densities, representing both the human mandible and maxilla. Materials and Methods: One hundred twenty 3.8 × 11-mm commercial dental implants were used. Forty implants had small threads with a machined neck, 40 implants had small threads with a microthreaded neck, and the last 40 implants had large threads with a reverse neck design. Fresh bovine ribs, representing a medium-dense bone density (D2-D3), and fresh ovine iliac crest, representing a soft bone density (D4), were used. Insertion torque and micromobility under lateral force data were recorded for each implant. Results: In the medium-dense bone type, the reverse neck implant design showed less primary implant stability than the conventional straight implant neck. In soft bone, both implants with the large thread design and microthreaded neck implants showed better implant stability than the implant with a small thread design with a straight machined neck. Implants with large and self-cutting threads showed significantly (P < .05) lower micromobility values than other implants in postextractive sites in low-density bone. Conclusion: Implant geometries and bone density are the main factors involved in the degree of primary implant stability. Large-thread implant designs are highly desirable in cases of poor bone quality. Each implant geometry generates an insertion torque value, which is correlated to the stability of that specific implant in a specific bone quality, but the insertion torque is not an objective value to compare primary stability between different implant types.
Implant stability related to insertion torque force and bone density
Implant Dentistry, 1996
h e b o n e density, and i m p l a n t a n d a b u t m e n t length. The results i n d i c a t e d that h i g h correlations exist b e t w e e n PTVs and i n s e r t i o n torque force (R v a l u e-0.74579), and PTVs a n d b o n e d e n s i t y (R v a l u e-0.83031). T h e r e w a s also a significant difference (p 0.001) a m o n g the PTVs of the different a b u t m e n t l e n g t h s used. Implant l e n g t h did not d e m o n s t r a t e i n f l u e n c e on P T V s (p 0.3847).
Effect of insertion factors on dental implant insertion torque/energy-experimental results
Journal of the Mechanical Behavior of Biomedical Materials, 2020
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Role of Mechanical Stimuli in Oral Implantation
Prosthetic implantation has been a prevalent surgical procedure in dentistry. Insertion of dental implant significantly changes local oral conditions and leads to the surrounding bone to remodel to a new morphology. To predict how the bone responds such a biomechanical change, finite element analysis (FEA) based remodeling simulation has proven effective. For a range of mechanical stimuli, which should be used remains controversial arguable? This paper aims to compare how the different mechanical stimuli, including mechostat model (effective strain), daily stress and strain energy density (SED) affect the predictions of bone remodeling.
An evaluation of insertion sites for mini-implants
The Angle Orthodontist, 2012
Objective: (1) To report the thickness of the cortical bone in insertion sites commonly used for orthodontic mini-implants, (2) to assess the impact of a change in insertion angle on primary cortical bone-to-implant contact, and (3) to evaluate the risk of maxillary sinus perforation. Materials and Methods: At autopsy, 27 human samples containing three to five adjacent teeth were excised and scanned using a table-top micro-computed tomography system. Bone thickness measurements were taken at 45° and 90° to the long the axis of the adjacent teeth, simulating a mini-implant insertion at the mid-root level. Results: In the maxilla, the overall mean cortical thickness at 90° was 0.7 mm buccally in the lateral region, 1.0 mm buccally in the anterior region, and 1.3 mm palatally. In the mandible, the mean cortical thickness was 0.7 mm buccally and 1.8 mm lingually in the anterior region; 1.9 mm buccally and 2.6 mm lingually in the lateral region. Changing the insertion angle from 90° to 4...