Minimization of dental implant diameter and length according to bone quality determined by finite element analysis and optimized calculation

Ueda, Nana; Takayama, Yoshihisa; Yokoyama, Atsuro

doi:10.1016/j.jpor.2016.12.004

Cited by 43 publications

(27 citation statements)

References 31 publications

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“…The diameter and the length, which are the most studied variables, both strongly impact the mechanical environment of the peri-implant bone. It has been shown that a larger length reduces stress in the bone but not as much as a larger diameter [7]. The placement of the implant in the bone is also frequently studied, and some papers have considered its insertion depth [8] or inclination in the bone [9].…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of the Stress Field in Peri-Implant Bone: A Parametric Study of Influencing Parameters and Their Interactions for Multi-Objective Optimization

et al. 2020

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The present work proposes a parametric finite element model of the general case of a single loaded dental implant. The objective is to estimate and quantify the main effects of several parameters on stress distribution and load transfer between a loaded dental implant and its surrounding bone. The interactions between them are particularly investigated. Seven parameters (implant design and material) were considered as input variables to build the parametric finite element model: the implant diameter, length, taper and angle of inclination, Young’s modulus, the thickness of the cortical bone and Young’s modulus of the cancellous bone. All parameter combinations were tested with a full factorial design for a total of 512 models. Two biomechanical responses were identified to highlight the main effects of the full factorial design and first-order interaction between parameters: peri-implant bone stress and load transfer between bones and implants. The description of the two responses using the identified coefficients then makes it possible to optimize the implant configuration in a case study with type IV. The influence of the seven considered parameters was quantified, and objective information was given to support surgeon choices for implant design and placement. The implant diameter and Young’s modulus and the cortical thickness were the most influential parameters on the two responses. The importance of a low Young’s modulus alloy was highlighted to reduce the stress shielding between implants and the surrounding bone. This method allows obtaining optimized configurations for several case studies with a custom-made design implant.

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Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of the Stress Field in Peri-Implant Bone: A Parametric Study of Influencing Parameters and Their Interactions for Multi-Objective Optimization

et al. 2020

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“…Attempts to increase the bone-to-implant contact area have focused on increasing the diameter and/or length of implants, or altering the fixture micro and/or macro design. 6 Some researchers believe that the implant diameter is a more important factor in decreasing stress in bone, 7 while according to others, the implant length has a more significant effect on the strain/stress distribution in bone around dental implants. 8 On the other hand, it has been shown that neither the implant diameter nor its length are as important as the technique of surgery, sufficient primary stability, and pre-and postoperative oral hygiene.…”

Section: Introductionmentioning

confidence: 99%

“…9 Larger implants, in terms of both diameter and length, improve the stress/strain distribution patterns; however, in many clinical situations, the alveolar bone does not have sufficient thickness or height for the insertion of such implants. 6 There are cases in which the clinician must choose between inserting a longer implant with a smaller diameter or decreasing the bone height and using a shorter implant with a greater diameter. The subsequent crestal bone resorption is another concern in changing the stress/strain distribution pattern, as the crown-implant ratio changes over time.…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis of stress distribution around a dental implant with different amounts of bone loss: An in vitro study

Jafarian¹,

Mirhashemi²,

Emadi³

2019

Dent. Med. Probl.

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Background. The choice between reducing the bone height and inserting a shorter implant with a greater diameter or a longer and narrower implant without altering the bone height is a challenge in clinical practice. Objectives. The purpose of this finite element analysis (FEA) was to compare the pattern and level of stress around implants with different lengths and diameters and with different amounts of bone loss, which changes the implant-crown ratio over time, depending on the available bone and the treatment modality. Material and methods. The FEA was carried out to evaluate the stress distribution in bone around 3.25 × 13 mm and 4 × 11 mm 3i implants, and 3.3 × 12 mm and 4.1 × 10 mm Straumann ® implants. A 3D segment of the mandible was reconstructed from a computed tomography image of the posterior mandible. Occlusal force was simulated by applying 200 N vertical and 40 N horizontal loads to the occlusal node at the center of the abutment. The pattern of stress distribution in bone was evaluated in 10 models for each implant, representing 0-9 mm of bone resorption. Results. The results showed that along with decreasing the implant insertion depth, and consequently the implant-crown ratio, the amount of stress in bone increased. The amount of stress increased with an increase in depth of bone loss in all models, but there was no significant change in the amount of stress in the first several millimeters of bone loss. Conclusions. The results suggest that in terms of stress distribution, it is better to reduce the bone height and insert shorter implants with a greater diameter than longer implants with a smaller diameter.

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“…Fractures occur when the skeleton is subjected to external forces greater than the maximum load. Generally, the larger the maximum load, the better is the bone quality . Deflection is the degree of resistance to distortion.…”

Section: Results and Analysismentioning

confidence: 99%

Effect of the mixture of mulberry leaf powder and KGM flour on promoting calcium absorption and bone mineral density in vivo

et al. 2020

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BACKGROUND In this paper, mulberry leaf powder (MLP) and konjac glucomannan (KGM) flour were used as raw materials, and animal experiments were designed to evaluate the effects of a mixture of MLP and KGM on bone density. The femoral bone microstructure of mice and pathological changes were observed by using micro‐computed tomography) and haematoxylin and eosin (HE) staining methods, respectively. A three‐point bending test was used to determine the biomechanical properties of the femur. RESULTS Results indicated that the calcium content of MLP was high, reaching 16 148.5 mg kg−1, and the total proportion of water‐soluble calcium, calcium pectinate, and calcium carbonate accounted for about 60% of the total calcium content. Serum alkaline phosphatase (AKP) activity was significantly lower, and serum calcium content was significantly higher (P < 0.05), in the MLP + KGM group (KM) than in the low‐calcium control group, whereas no significant difference (P > 0.05) was found for serum phosphorus content. KM had a longer femur length, a higher bone mineral density (BMD) (P > 0.05), and significantly greater femur diameter, dry weight, index and bone calcium content (P < 0.05). However, these parameters were not significantly different from those of the calcium carbonate control group (P > 0.05). CONCLUSION The results indicate that the MLP/KGM mixture can reduce the high rate of bone turnover and the corresponding loss of bone mass caused by calcium deficiency and is thus effective in enhancing bone density. © 2019 Society of Chemical Industry

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Minimization of dental implant diameter and length according to bone quality determined by finite element analysis and optimized calculation

Cited by 43 publications

References 31 publications

Finite Element Analysis of the Stress Field in Peri-Implant Bone: A Parametric Study of Influencing Parameters and Their Interactions for Multi-Objective Optimization

Finite Element Analysis of the Stress Field in Peri-Implant Bone: A Parametric Study of Influencing Parameters and Their Interactions for Multi-Objective Optimization

Finite element analysis of stress distribution around a dental implant with different amounts of bone loss: An in vitro study

Effect of the mixture of mulberry leaf powder and KGM flour on promoting calcium absorption and bone mineral density in vivo

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