Biomechanical Loading Comparison between Titanium and Unsintered Hydroxyapatite/Poly-L-Lactide Plate System for Fixation of Mandibular Subcondylar Fractures

Osteosynthesis absorbable materials made of uncalcined and unsintered hydroxyapatite (u-HA) particles, poly-l-lactide (PLLA), and u-HA/PLLA are bioresorbable, and these plate systems have feasible bioactive osteoconductive capacities. However, their strength and stability for fixation in mandibular subcondylar fractures remain unclear. This in vitro study aimed to assess the biomechanical strength of u-HA/PLLA bioresorbable plate systems after internal fixation of mandibular subcondylar fractures. Tensile and shear strength were measured for each u-HA/PLLA and titanium plate system. To evaluate biomechanical behavior, 20 hemimandible replicas were divided into 10 groups, each comprising a titanium plate and a bioresorbable plate. A linear load was applied anteroposteriorly and lateromedially to each group to simulate the muscular forces in mandibular condylar fractures. All samples were analyzed for each displacement load and the displacement obtained by the maximum load. Tensile and shear strength of the u-HA/PLLA plate were each approximately 45% of those of the titanium plates. Mechanical resistance was worst in the u-HA/PLLA plate initially loaded anteroposteriorly. Titanium plates showed the best mechanical resistance during lateromedial loading. Notably, both plates showed similar resistance when a lateromedially load was applied. In the biomechanical evaluation of mandibular condylar fracture treatment, the u-HA/PLLA plates had sufficiently high resistance in the two-plate fixation method.

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Biomechanical Loading Comparison between Titanium and Bioactive Resorbable Screw Systems for Fixation of Intracapsular Condylar Head Fractures

Materials ◽

10.3390/ma13143153 ◽

2020 ◽

Vol 13 (14) ◽

pp. 3153

Author(s):

Shintaro Sukegawa ◽

Norio Yamamoto ◽

Keisuke Nakano ◽

Kiyofumi Takabatake ◽

Hotaka Kawai ◽

...

Keyword(s):

In Vitro Study ◽

Small Displacement ◽

Mechanical Resistance ◽

Biomechanical Behavior ◽

Model Study ◽

Linear Load ◽

Titanium Screws ◽

Significant Difference ◽

Condylar Head

Osteosynthesis resorbable materials made of uncalcined and unsintered hydroxyapatite (u-HA) particles, poly-L-lactide (PLLA), are bioresorbable, and these materials have feasible bioactive/osteoconductive capacities. However, their strength and stability for fixation in mandibular condylar head fractures remain unclear. This in vitro study aimed to assess the biomechanical strength of u-HA/PLLA screws after the internal fixation of condylar head fractures. To evaluate their biomechanical behavior, 32 hemimandible replicas were divided into eight groups, each consisting of single-screw and double-screw fixations with titanium or u-HA/PLLA screws. A linear load was applied as vertical and horizontal load to each group to simulate the muscular forces in condylar head fractures. Samples were examined for 0.5, 1, 2, and 3-mm displacement loads. Two screws were needed for stable fixation of the mandibular condylar head fracture during biomechanical evaluation. After screw fixation for condylar head fractures, the titanium screws model was slightly more resistant to vertical and horizontal movement with a load for a small displacement than the u-HA/PLLA screws model. There was no statistically significant difference with load for large displacements. The u-HA/PLLA screw has a low mechanical resistance under small displacement loading compared with titanium within the limits of the mandibular head fracture model study.

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Biomechanical Evaluation of a New Fixation Method for Stabilization of Sagittal Split Ramus Osteotomy After Mandibular Advancement

Craniomaxillofacial Trauma & Reconstruction Open ◽

10.1177/24727512211019230 ◽

2021 ◽

Vol 6 ◽

pp. 247275122110192

Author(s):

Karel Kuik ◽

Jean Pierre T. F. Ho ◽

Cornelis Klop ◽

Maurits H. T. de Ruiter ◽

Cornelis J. Kleverlaan ◽

...

Keyword(s):

Hybrid Method ◽

In Vitro Study ◽

Mandibular Advancement ◽

Fixation Method ◽

Common Procedure ◽

Sagittal Split Ramus Osteotomy ◽

Fixation Methods ◽

Biomechanical Evaluation ◽

Monocortical Screws

Study Design: Biomechanical in vitro study. Mandibular advancement after sagittal split ramus osteotomy (SSRO) is a common procedure in orthognathic surgery. Several fixation methods are used for stabilization of SSRO. Objective: The aim of this study was to compare a new fixation method (gridplate) with more contemporary applied methods of fixation. Material and Methods: In this study, 50 polyurethane hemimandibles with a prefabricated SSRO were used as specimens. All hemimandibles were advanced by 8 mm and divided into 5 groups with different fixation methods: (A) one 4-hole miniplate with 4 monocortical screws; (B) two 4-hole miniplates with 8 monocortical screws; (C) one 4-hole miniplate with 4 monocortical screws and 1 bicortical screw in the retromolar area (hybrid method); (D) 3 bicortical screws in an inverted-L pattern; and (E) one 8-hole gridplate with 8 monocortical screws. Loads in newtons were recorded at displacements of the mandibular incisive edge at 1 mm, 3 mm and 5 mm. Results: Fixation with 3 bicortical screws and the gridplate presented the most stability, followed by two 4-hole miniplates. Fixation with the hybrid method or the single miniplate showed the least stability. Conclusion: According to the results of this study, the 8-hole gridplate design appears a sufficient fixation method regarding stabilization of SSRO with larger mandibular advancement.

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Analysis of Mandibular Test Specimens Used to Assess a Bone Fixation System

Craniomaxillofacial Trauma & Reconstruction ◽

10.1055/s-0034-1393732 ◽

2015 ◽

Vol 8 (3) ◽

pp. 171-178 ◽

Cited By ~ 1

Author(s):

LeandroStocco Baccarin ◽

Renato Correa Viana Casarin ◽

JorgeVicente Lopes-da-Silva ◽

LuisAugusto Passeri

Keyword(s):

Biomechanical Testing ◽

Load Resistance ◽

Fixation Method ◽

Sagittal Split Ramus Osteotomy ◽

Biomechanical Behavior ◽

Synthetic Materials ◽

Group A ◽

Materials Used ◽

Group B

The aim of this study was to assess through biomechanical testing if different synthetic materials used to fabricate test specimens have a different biomechanical behavior in comparison with other materials when simulating in vitro load resistance of a fixation method established for sagittal split ramus osteotomy (SSRO). Thirty synthetic and standardized human hemimandible replicas with SSRO were divided into three groups of 10 samples each. Group A—ABS plastic; Group B—polyamide; and Group C—polyurethane. These were fixated with three bicortical position screws (16 mm in length, 2.0-mm system) in an inverted L pattern using perforation guide and 5-mm advancement. Each sample was submitted to linear vertical load, and load strength values were recorded at 1, 3, 5, 7, and 10 mm of displacement. The means and standard deviation were compared using the analysis of variance ( p < 0.05) and the Tukey test. A tendency for lower values was observed in Group B in comparison with Groups A and C. At 3 and 5 mm of displacement, a difference between Groups A and C was found in comparison with Group B ( p < 0.05). At 7 and 10 mm of displacement, a difference was found among the three groups, in which Group C showed the highest values and Group B the lowest ( p < 0.05). Taking into consideration the results obtained and the behavior of each material used as a substrate, significant differences occurred among the materials when compared among them.

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Shear Strength of Visible Light Cured-Urethane Dimethacrylate and Polymethylmethacrylate Denture Base Material to Cobalt Chromium Dental Prosthesis: An In-Vitro Study

Journal of Biomaterials and Tissue Engineering ◽

10.1166/jbt.2017.1659 ◽

2017 ◽

Vol 7 (10) ◽

pp. 1008-1013

Author(s):

Abdulaziz M. Albaker ◽

Faisal M. Fahmi ◽

Merna F. Fahmi ◽

Abdullah M. Alfarraj Aldosari ◽

Ishfaq A. Bukhari ◽

...

Keyword(s):

Shear Strength ◽

Visible Light ◽

Base Material ◽

In Vitro Study ◽

Dental Prosthesis ◽

Vitro Study ◽

Cobalt Chromium ◽

Denture Base ◽

Urethane Dimethacrylate

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Inclusion of the periodontal ligament in studies on the biomechanical behavior of fiber post-retained restorations: An in vitro study and three-dimensional finite element analysis

Proceedings of the Institution of Mechanical Engineers Part H Journal of Engineering in Medicine ◽

10.1177/0954411916630006 ◽

2016 ◽

Vol 230 (3) ◽

pp. 230-238 ◽

Cited By ~ 3

Author(s):

Carmen González-Lluch ◽

Pablo-Jesús Rodríguez-Cervantes ◽

Leopoldo Forner ◽

Amaya Barjau

Keyword(s):

Finite Element Analysis ◽

Periodontal Ligament ◽

Three Dimensional ◽

In Vitro Study ◽

Fiber Post ◽

Element Analysis ◽

Biomechanical Behavior ◽

Dimensional Finite Element ◽

Three Dimensional Finite Element

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Biocompatibility and Cellular Behavior of TiNbTa Alloy with Adapted Rigidity for the Replacement of Bone Tissue

Metals ◽

10.3390/met11010130 ◽

2021 ◽

Vol 11 (1) ◽

pp. 130

Author(s):

Mercè Giner ◽

Ernesto Chicardi ◽

Alzenira de Fátima Costa ◽

Laura Santana ◽

María Ángeles Vázquez-Gámez ◽

...

Keyword(s):

Cortical Bone ◽

Bone Tissue ◽

Stress Shielding ◽

Mechanical Resistance ◽

Cellular Behavior ◽

Biomechanical Behavior ◽

Functional Behavior ◽

Bone Replacement ◽

Osteoblast Adhesion

In this work, the mechanical and bio-functional behavior of a TiNbTa alloy is evaluated as a potential prosthetic biomaterial used for cortical bone replacement. The results are compared with the reference Ti c.p. used as biomaterials for bone-replacement implants. The estimated mechanical behavior for TiNbTa foams was also compared with the experimental Ti c.p. foams fabricated by the authors in previous studies. A TiNbTa alloy with a 20–30% porosity could be a candidate for the replacement of cortical bone, while levels of 80% would allow the manufacture of implants for the replacement of trabecular bone tissue. Regarding biocompatibility, in vitro TiNbTa, cellular responses (osteoblast adhesion and proliferation) were compared with cell growth in Ti c.p. samples. Cell adhesion (presence of filopodia) and propagation were promoted. The TiNbTa samples had a bioactive response similar to that of Ti c.p. However, TiNbTa samples show a better balance of bio-functional behavior (promoting osseointegration) and biomechanical behavior (solving the stress-shielding phenomenon and guaranteeing mechanical resistance).

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Evaluation and Comparison of Shear Bond Strengths of Self Etching Primers To Dentin– an In-Vitro Study

Dental Journal of Advance Studies ◽

10.1055/s-0038-1671992 ◽

2014 ◽

Vol 02 (02) ◽

pp. 091-095

Author(s):

Veerendra Uppin ◽

Priyanka Sarangi ◽

Sukanta Satapathy

Keyword(s):

Shear Strength ◽

Bond Strength ◽

Shear Bond Strength ◽

Testing Machine ◽

In Vitro Study ◽

Strength Based ◽

Molar Teeth ◽

Bond Strengths ◽

Abrasive Paper

AbstractAn in-vitro evaluation was done to compare shear bond strength of four self etching primer adhesives to dentin. 75 human extracted molar teeth were selected. The occlusal surface of these teeth was ground to remove coronal enamel and expose dentin. The dentinal surface of each tooth was then abraded using series of silicon carbide (320, 400, 600 grit) abrasive paper. Teeth were divided into 5 groups of 15 teeth each and composite post were then built on the bonded surfaces using Z-100 hybrid composite. The teeth were then fractured applying shearing load through universal testing machine. Shear strength values were in the range of 15.96 to 22.64 Mpa. Clearfil S3 gave highest mean shear bond strength whereasAdhe SE gave lowest value of shear strength. Based on this study it could be concluded that contemporary self etching primer adhesives bond successfully to dentin and also their bonding ability seems to be comparable to conventional total etch system.

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Biomechanical comparison of dynamic condylar screw and locking compression plate fixation in unstable distal femoral fractures: An in vitro study

Indian Journal of Orthopaedics ◽

10.4103/0019-5413.121594 ◽

2013 ◽

Vol 47 (6) ◽

pp. 615 ◽

Cited By ~ 8

Author(s):

AshutoshKumar Singh ◽

Amit Rastogi ◽

Vakil Singh

Keyword(s):

Plate Fixation ◽

Femoral Fractures ◽

In Vitro Study ◽

Locking Compression Plate ◽

Vitro Study ◽

Distal Femoral Fractures ◽

Dynamic Condylar Screw ◽

Compression Plate ◽

Biomechanical Comparison

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Investigation of a Modified Novel Technique in Bilateral Sagittal Splitting Osteotomy Fixation: Finite Element Analysis and In Vitro Biomechanical Test

BioMed Research International ◽

10.1155/2020/8707389 ◽

2020 ◽

Vol 2020 ◽

pp. 1-8

Author(s):

Li-Ren Chang ◽

Chien-Chung Chen ◽

Seng Feng Jeng ◽

Yu-Ray Chen ◽

Lain-Chyr Hwang ◽

...

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Plate Fixation ◽

Von Mises Stress ◽

Fixation Method ◽

Osteotomy Site ◽

Biomechanical Test ◽

Fixation Failure ◽

Element Analysis

Purpose. To evaluate the biomechanical properties of the modified novel 2-hole monocortical plate fixation (2HMCPf) and traditional 4-hole monocortical plate fixation (4HMCPf) techniques in bilateral sagittal splitting osteotomy (BSSO) synthesis using a finite element analysis (FEA) and an in vitro biomechanical test with the application of a shearing loading force on a sawbone mandible model. Materials and Methods. A three-dimensional mandible models were generated using the geometry obtained from the computerized tomography image of a sawbone mandible. Plates and screws were generated and combined with the mandible in a CAD environment. The 2HMCPf and traditional 4HMCPf techniques for BSSO osteosynthesis were then analyzed under the occlusal load using the FEA. An in vitro biomechanical test was executed to verify the result of FEA. The force on fixation failure and pattern of failure were recorded. Results. The results revealed that the von Mises Stress on the mandible cortical bone (75.98 MPa) and the screw/plate (457.19 MPa) of the 2HMCPf group was lower than that of the 4HMCPf group (987.68 MPa, 1781.59 MPa). The stress concentrated on the central region of the 4HMCPf group and the distal set of the 2HMCPf group. In vitro study using the sawbone mandible model showed mechanical failure at the region of the proximal segment near the osteotomy site with the 4HMCPf group (average 32.198 N) but no failure on the fixation sites with the 2HMCPf group. Instead, the mandible sawbone fractured on the condyle neck region (average 44.953 N). Conclusion. From the biomechanical perspective, we proved that the 2HMCPf method was able to withstand a higher shearing loading force than the 4HMCPf fixation method in BSSO osteosynthesis.

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