Strength analysis of Cranioplasty PMMA flap material

Archana, R.; Baldia, Manish; Jeeva, J. B.; Devakumar,; Joseph, Mathew

doi:10.1016/j.matpr.2019.04.188

Cited by 8 publications

(4 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our clinical experience has shown that this thickness allows good handling during fabrication, sufficient fixation of the screws and no implant fractures occurred under clinical conditions. This is also consistent with the findings in the literature that a thickness of 3 mm has high compressive and flexural strength when the composition of powder and liquid is equal, similar to the present study [ 38 ]. The results will provide valuable information relating to properties for use in virtual design.…”

Section: Introductionsupporting

confidence: 94%

“…For example, the implant thickness, fracture pattern, implant size, and reconstruction region are essential determinants. No standards for testing PMMA cranial implants have been established, and confirmed data on fracture toughness, and standard biomechanical tests are scarce [ 33 , 34 , 35 , 36 , 37 , 38 ]. Animal studies have demonstrated that PMMA provides the greatest neuroprotection in cranioplasties compared to high-density porous polyethylene and autologous bone [ 37 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Biomechanical Evaluation of Patient-Specific Polymethylmethacrylate Cranial Implants for Virtual Surgical Planning: An In-Vitro Study

et al. 2022

View full text Add to dashboard Cite

Cranioplasty with freehand-molded polymethylmethacrylate implants is based on decades of experience and is still frequently used in clinical practice. However, data confirming the fracture toughness and standard biomechanical tests are rare. This study aimed to determine the amount of force that could be applied to virtually planned, template-molded, patient-specific implants (n = 10) with an implant thickness of 3 mm, used in the treatment of a temporoparietal skull defect (91.87 cm2), until the implant cracks and finally breaks. Furthermore, the influence of the weight and porosity of the implant on its force resistance was investigated. The primary outcome showed that a high force was required to break the implant (mean and standard deviation 1484.6 ± 167.7 N), and this was very strongly correlated with implant weight (Pearson’s correlation coefficient 0.97; p < 0.001). Secondary outcomes were force application at the implant's first, second, and third crack. Only a moderate correlation could be found between fracture force and the volume of porosities (Pearson’s correlation coefficient 0.59; p = 0.073). The present study demonstrates that an implant thickness of 3 mm for a temporoparietal skull defect can withstand sufficient force to protect the brain. Greater implant weight and, thus, higher material content increases thickness, resulting in more resistance. Porosities that occur during the described workflow do not seem to reduce resistance. Therefore, precise knowledge of the fracture force of polymethylmethacrylate cranial implants provides insight into brain injury prevention and serves as a reference for the virtual design process.

show abstract

Section: Introductionsupporting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Biomechanical Evaluation of Patient-Specific Polymethylmethacrylate Cranial Implants for Virtual Surgical Planning: An In-Vitro Study

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Compared with ordinary glass (silica glass), PMMA not only has a relatively low density, but also has a better crushing resistance. PMMA can be used as an excellent functional polymer material due to its good biocompatibility [4]. Moreover, PMMA is also widely used in medical technologies and photoelectronic devices as well as other areas [5].…”

Section: Introductionmentioning

confidence: 99%

Development of Synthesis and Application of High Molecular Weight Poly(Methyl Methacrylate)

2022

View full text Add to dashboard Cite

Poly(methyl methacrylate) (PMMA) is widely used in aviation, architecture, medical treatment, optical instruments and other fields because of its good transparency, chemical stability and electrical insulation. However, the application of PMMA largely depends on its physical properties. Mechanical properties such as tensile strength, fracture surface energy, shear modulus and Young’s modulus are increased with the increase in molecular weight. Consequently, it is of great significance to synthesize high molecular weight PMMA. In this article, we review the application of conventional free radical polymerization, atom transfer radical polymerization (ATRP) and coordination polymerization for preparing high molecular weight PMMA. The mechanisms of these polymerizations are discussed. In addition, applications of PMMA are also summarized.

show abstract

“…9 PMMA's physical properties were found to have high compressive strength and flexural strength; the values of these properties fell within the range of overall strength of cranial bone when molded at a thickness of between 5 and 9 mm, making it ideal for this kind of application. 10 Several publications described techniques for molding PMMA bone cement with excellent results, but our goal was to describe a stepwise approach to the procedure from design to implantation that could be replicated with confidence in implant outcome (Figure 9). During the technique's development, we had to choose between sterile molding and nonsterile molding followed by implant sterilization.…”

Section: Discussionmentioning

confidence: 99%

Cold-Injection Molded Gentamicin-Impregnated Polymethyl Methacrylate Implants for Cranioplasty

Fahem¹,

Ali²,

Duddu³

et al. 2021

Operative Surg.

View full text Add to dashboard Cite

BACKGROUND Cranioplasty can be carried out using either fresh, frozen autologous bone or synthetic substitutes. Ordering artificial 3 dimensional (3D) implants is challenging and time consuming depending on geographical location. In this article, we share our experience using a streamlined process of producing 3D computer-assisted design (CAD) implants using commercially available 3D printers and silicone molds that can be easily replicated with consistent results and are associated with good outcomes. OBJECTIVE To develop patient-specific implants for patients with cranial defects that are accurate, consistent, low cost, and easy to replicate while reducing operator-dependent factors. METHODS We present data from 15 patients who underwent cranioplasty with 3D CAD-designed gentamicin-impregnated bone cement implants that were molded using the cold injection technique. RESULTS The technique was consistent in result production, required little postdemolding manipulation, and showed no dimensional variation in design. Postoperative computed tomography scans showed excellent implant fit, and patients had a low complication rate. CONCLUSION We have demonstrated a technique of mold preparation that is efficient and that produces a reliable result. Polymethyl methacrylate implants molded using this technique showed better reproducibility, higher accuracy, and precision than other types of implants and required minimal postdemolding clean-up.

show abstract

Strength analysis of Cranioplasty PMMA flap material

Cited by 8 publications

References 9 publications

Biomechanical Evaluation of Patient-Specific Polymethylmethacrylate Cranial Implants for Virtual Surgical Planning: An In-Vitro Study

Biomechanical Evaluation of Patient-Specific Polymethylmethacrylate Cranial Implants for Virtual Surgical Planning: An In-Vitro Study

Development of Synthesis and Application of High Molecular Weight Poly(Methyl Methacrylate)

Cold-Injection Molded Gentamicin-Impregnated Polymethyl Methacrylate Implants for Cranioplasty

Contact Info

Product

Resources

About