Patient specific root-analogue dental implants – additive manufacturing and finite element analysis

Gattinger, J.; Bullemer, Christian N.; Harrysson, Ola L. A.

doi:10.1515/cdbme-2016-0025

Cited by 6 publications

(3 citation statements)

References 11 publications

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“…The results of this study revealed that there was no statistically significant difference in displacements along the loading direction (Z-axis) between the RAIs and the TIs, suggesting comparable stability between the two implant types. These findings are consistent with a study by Gattinger et al [ 38 ], where they compared by finite element analysis the micromotion of RAI and standard implant and reported that the RAI was as good as the standard threaded implant in terms of micromotion. A similar conclusion was reached out by Chen et al [ 39 ] who studied the biomechanical performance of RAI for both the immediate and the delayed loading protocols.…”

Section: Discussionsupporting

confidence: 92%

Evaluation of micromotion in multirooted root analogue implants embedded in synthetic bone blocks: an in vitro study

Aldesoki,

Bourauel,

Elshazly

et al. 2024

BMC Oral Health

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Background While conventional threaded implants (TI) have proven to be effective for replacing missing teeth, they have certain limitations in terms of diameter, length, and emergence profile when compared to customised root analogue implants (RAI). To further investigate the potential benefits of RAIs, the aim of this study was to experimentally evaluate the micromotion of RAIs compared to TIs. Methods A 3D model of tooth 47 (mandibular right second molar) was segmented from an existing cone beam computed tomography (CBCT), and a RAI was designed based on this model. Four RAI subgroups were fabricated as follows: 3D-printed titanium (PT), 3D-printed zirconia (PZ), milled titanium (MT), milled zirconia (MZ), each with a sample size of n = 5. Additionally, two TI subgroups (B11 and C11) were used as control, each with a sample size of n = 5. All samples were embedded in polyurethane foam artificial bone blocks and subjected to load application using a self-developed biomechanical Hexapod Measurement System. Micromotion was quantified by analysing the load/displacement curves. Results There were no statistically significant differences in displacement in Z-axis (the loading direction) between the RAI group and the TI group. However, within the RAI subgroups, PZ exhibited significantly higher displacement values compared to the other subgroups (p < 0.05). In terms of the overall total displacement, the RAI group showed a statistically significant higher displacement than the TI group, with mean displacement values of 96.5 µm and 55.8 µm for the RAI and TI groups, respectively. Conclusions The RAI demonstrated promising biomechanical behaviour, with micromotion values falling within the physiological limits. However, their performance is less predictable due to varying anatomical designs.

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Section: Discussionsupporting

confidence: 92%

Evaluation of micromotion in multirooted root analogue implants embedded in synthetic bone blocks: an in vitro study

Aldesoki,

Bourauel,

Elshazly

et al. 2024

BMC Oral Health

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“…Clearly, teeth are an important part of human body playing an important role in our digestive systems by grinding the food to swallowable size [1,2]. Approximately half of the population experience tooth loss at some stage in life due to various factors, excluding the natural loss due to age [3][4][5][6][7]. The loss of teeth due to unnatural causes is often treated with artificial teeth which have life expectancy of 65-95% [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Physiological Response of a Natural Central Incisor Tooth to Various Loading Conditions: A 3D Finite Element Study

Nikam¹,

Milani²

2023

Recent Prog Mater

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This study evaluates the influence of different loading angles and the area of loading on the ensuing stress distribution and the physical response of a natural central incisor tooth, using a 3D finite element analysis. The CAD model of the incisor tooth assembly (including enamel, dentin, periodontal ligament, pulp, gingiva and jaw bone) was subject to an external (chewing) load of 100 N, over four different areas and at four different angles along the vertical. It was observed that the tooth experiences high von-Mises equivalent stresses and high bending when the load applied is closer to the incisal edge of the crown. Also, the stresses on the dentin, in general, increased with the increase in the loading angle regardless of the area of loading; with the highest stress (~70 MPa) generated at 45° angle. The percentage change observed in dentin von-Mises stresses was higher than that of enamel when the loading angle was increased from 0° to 45°, because of the higher stiffness of enamel and structural differences in enamel and dentin. The numerical results indicated that applying loads on incisal edge would simulate a severe loading condition for the incisor tooth.

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“…Finite element analysis (FEA) has become an effective method to evaluate peri-implant bone stresses and the relative micro-displacement between bone-to-implant interfaces under certain loading conditions [21]. However, most previous FEA studies on RAIs were limited in the analysis of the initial stability, which is one of the most important factors for the success of implant placement; they assumed the contact condition between the bone and implant was fully bonded and in a completely osseo-integrated state [19,22].…”

Section: Introductionmentioning

confidence: 99%

Biomechanical Evaluation of Initial Stability of a Root Analogue Implant Design with Drilling Protocol: A 3D Finite Element Analysis

Lee

Kim

et al. 2020

Applied Sciences

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Background: The aim of this study was to biomechanically evaluate the initial stability of a patient-specific root analogue implant (RAI) design with drilling protocol by comparing it to designs without drilling protocol through a 3D finite element analysis (FEA). Methods: A 3D surface model of an RAI for the upper right incisor was constructed. To evaluate the effect of root apex drilling, four modified RAI shapes were designed with the press-fit implantation method: Non-modified, wedge added at root surface, lattice added at root surface, and apex-anchor added at root apex (AA). Each model was subjected to an oblique load of 100 N. To simulate the initial stability of implantation, contact conditions at the implant–bone interface were set to allow for the sliding phenomenon with low friction (frictional coefficient 0.1–0.5). Analysis was performed to evaluate micro-displacements of the implants and peak stress on the surrounding bones. Results: Under all low frictional coefficient conditions, the lowest von Mises stress level on the cortical bone and fewest micro-displacements of the implant were observed in the AA design. Conclusion: In view of these results, the AA design proved superior in reducing the stress concentration on the supporting cortical bone and the micro-displacement of RAI.

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Patient specific root-analogue dental implants – additive manufacturing and finite element analysis

Cited by 6 publications

References 11 publications

Evaluation of micromotion in multirooted root analogue implants embedded in synthetic bone blocks: an in vitro study

Evaluation of micromotion in multirooted root analogue implants embedded in synthetic bone blocks: an in vitro study

Physiological Response of a Natural Central Incisor Tooth to Various Loading Conditions: A 3D Finite Element Study

Biomechanical Evaluation of Initial Stability of a Root Analogue Implant Design with Drilling Protocol: A 3D Finite Element Analysis

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