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Open research questions in Bone Tissue Engineering Materials

57 unresolved questions extracted from the limitations and future-work sections of 1,355 Bone Tissue Engineering Materials papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • The including cytocompatibility biological performance, is essential for load-bearing Dent Mater J 2026; 45(4): 464–469 469 further evaluation, and in vitro degradation behavior, was also not evaluated and remains to be investigated.

    Fabrication of β-tricalcium phosphate/polyacrylic acid composite granules as a potential bone substitute · 2026 · DOI

  • Piezoelectric biomaterials provide a revolutionary self-powered strategy for bone tissue engineering by replicating the native electromechanical microenvironment of natural bone. By converting endogenous physiological movements or exogenous stimuli like ultrasound into localized electrical signals, these smart materials effectively regulate crucial cellular behaviors. This biophysical stimulation alters cell membrane potentials, activates mechanosensitive and voltage gated ion channels, reprograms cellular energy metabolism, and modulates the osteoimmune microenvironment toward a pro healing state. Consequently, this orchestrated cascade significantly accelerates osteogenic gene transcription and extracellular matrix mineralization to facilitate robust bone regeneration. Despite these tremendous advancements, several critical immediate clinical impede translation. limitations their 7.1 Long term stability and degradation The complex physiological environment poses a severe challenge to the long term stability of piezoelectric performance.

    Harnessing piezoelectricity for bone tissue engineering: recapitulating the electrophysiological microenvironment through smart biomaterials · 2026 · DOI

  • Several limitations should be acknowledged. First, this work examined four PVP/HA weight ratios (100:0, 80:20, 60:40, and 40:60) fabricated under a single elec- trospinning configuration. The effects of key processing variables (e.g., applied voltage, flow rate, tip-to-collector distance, and ambient conditions) were not the primary fo- cus of this study and were therefore kept constant rather than systematically varied. Second, scaffold characteriza- tion relied mainly on SEM (morphology and fiber diameter) and XRD (phase identification). Quantitative assessment of HA distribution and surface chemistry (e.g., elemen- tal/chemical mapping) as well as three-dimensional pore architecture was not performed, which limits a comprehen- sive description of filler dispersion and pore interconnectiv- ity. Third, porosity was estimated using ethanol liquid dis- placement, providing a bulk value without resolving pore- size distribution or distinguishing open and closed pores. Degradation was assessed by mass loss during static immer- sion in SBF for up to 21 days. This approach does not quan- tify mineral/apatite deposition, ion release, pH changes, or the retention of mechanical integrity during immersion, and it does not replicate the enzymatic and cell-mediated processes present in vivo. Finally, direct mechanical test- ing and biological evaluations (e.g., cytocompatibility, os- teogenic response, and in vivo performance) were beyond the scope of this study and are required to validate the op- timized composition for translational applications.

    Optimizing Hydroxyapatite Loading in Electrospinning Polyvinyl Pyrrolidone Fibers Toward Biocompatible Scaffolds for Critical-Sized Bone Defects · 2026 · DOI

  • Consequently, further investigations into the modifications of the BCP scaffold components are warranted to accelerate its degradation rate and synchronize it with the duration of bone repair.

    Hollow spherical mineralized scaffold integrated with a bone marrow mesenchymal stem cell-laden three-dimensional delivery system for regeneration of critical-sized bone defects · 2026 · DOI

  • Therefore, the ion-release behavior and release kinetics of the EGCG/HAP/AgNPs coating remain to be further investigated using quantitative methods. Therefore, the long-term coating stability, osseointegration capacity, and antibacterial efficacy of the EGCG/HAP/AgNPs coating under in vivo conditions remain to be validated.

    Antibacterial and osteogenic effect of EGCG/HAP/AgNPs composite coating on titanium surface · 2026 · DOI

  • Only seven human clinical studies were eligible for inclusion, and several originated from the same research groups, which may introduce publication or investigator bias. The limited num- ber of RCTs and the lack of long-term follow-up restrict the gen- eralisability of the findings. In addition, heterogeneity in study design, defect types, follow-up periods, and outcome assess- ment methods prevented direct quantitative comparison. The absence of standardised preparation protocols for EHA further complicates interpretation of outcomes.

    Eggshell sourced hydroxyapatite as a bone regenerative material in dentistry – a narrative review · 2026 · DOI

  • First, the release behavior of Zn²⁺ was evaluated in PBS solution rather than directly measured in the cellular culture microenvironment; therefore, the actual bioactive concentration of Zn²⁺ surrounding the cells remains unclear. Furthermore, the in vivo evaluation in this study was limited to a rat calvarial defect model and did not include assessments of critical-sized defects, infected bone defects, or large animal models.

    Low-density ZIF-8 coating optimizes the immune microenvironment of 3D-printed PCL scaffolds and promotes cranial defect repair · 2026 · DOI

  • Future research will focus on long-term in vitro and in vivo testing to evaluate the coatings’ osteogenic properties and biological stability, as well as on optimizing the MAO parameters and electrolyte composition to achieve an improved balance between coating thickness, porosity, and bioactivity.

    Incorporating TiO2 Nanoparticles to Enhance Corrosion Resistance, Cytocompatibility of PEO Calcium–Phosphate Coatings on Titanium · 2026 · DOI

  • To overcome this, novel systems are being developed, however, due to the wide variety of biomaterial combination, the heterogeneous assessment of newly formed tissue, and the intended clinical applications, there is still no consensus regarding which is more efficient in a particular clinical scenario.

    Carrier systems for bone morphogenetic proteins: An overview of biomaterials used for dentoalveolar and maxillofacial bone regeneration · 2022 · DOI

  • Tissue engineering, defined as the science of fabrication of new tissues for replacement and the regeneration of lost or destroyed tissues, has learned and is still learning, the secrets of its principles from bone repair and regeneration, and it is likely that more secrets still remain to be learned from the principles of bone tissue engineering (27, 28).

    Bone morphogenetic proteins and the induction of periodontal tissue regeneration · 2006 · DOI

  • However, several limitations of this study need to be addressed in future studies, including mechanical properties, long-term safety, and large-animal studies prior to translation to clinical application.

    Evaluation of bioactive scaffold magnesium-containing hydroxyapatite from biomass resources for supporting osteogenesis, angiogenesis, and in vivo bone regeneration · 2026 · DOI

  • Although mineral deposits were detected and their needle-like morphology assessed, characterization of more immature deposits was partially limited by the effects of uranyl acetate and the overall sample preparation process, which could lead to alteration or loss of less stable mineral phases.

    Ultra-structural analysis of mineralized extracellular matrix in osteogenic monolayers and spheroids: comparison of sample preparation methods · 2026 · DOI

  • To fully realise the promise of eggshell-derived biomaterials in standard clinical practice, future research should concentrate on refining processing methods, identifying optimal therapeutic indications, and proving comparative efficacy with bigger, multi-centre trials.

    Eggshell sourced hydroxyapatite as a bone regenerative material in dentistry – a narrative review · 2026 · DOI

  • Additional attention will be given to ion-leaching behavior, mechanical fatigue resistance, and coating adhesion under dynamic physiological conditions to ensure the reliability of these coatings in real biomedical applications.

    Incorporating TiO2 Nanoparticles to Enhance Corrosion Resistance, Cytocompatibility of PEO Calcium–Phosphate Coatings on Titanium · 2026 · DOI

  • Optimizing the MAO parameters and electrolyte composition to achieve an improved balance between coating thickness, porosity, and bioactivity.

    Incorporating TiO2 Nanoparticles to Enhance Corrosion Resistance, Cytocompatibility of PEO Calcium–Phosphate Coatings on Titanium · 2026 · DOI

  • HA can be obtained from local cattle slaughter waste in Aceh, Indonesia, which has not been widely studied for its potential for dental applications.

    Extraction and Characterization of Aceh Bovine Bone-Derived Hydroxyapatite for Applications in Dentistry · 2025 · DOI

  • Although PLA/HAp composites have been extensively studied, the utilization of fish-scale-derived HAp remains relatively underreported.

    PLA/NATURAL HYDROXYAPATITE COMPOSITES FOR POTENTIAL BONE FILLER APPLICATIONS · 2025 · DOI

  • Despite the known results of osteoplastic materials application in clinical practice, complete and high-quality regeneration of the maxillofacial bone, its mechanisms and dynamics remain incompletely understood, requiring further clarification and detailed study.

    Dynamics of regeneration following transplantation of octacalcium phosphate into an experimental defect in the rabbit mandibular bone: electron microscopic and morphometric study · 2024 · DOI

  • The paper references balancing benefits and limitations of xenografts but does not comprehensively address all remaining limitations preventing standardization in bone reconstruction.

    PROCESSED XENOGRAFTS, TOP BIOMATERIALS FOR BONE TISSUE RECONSTRUCTION · 2024 · DOI

  • However, the precise mechanisms underlying these intracellular processes remain unclear, and they cannot be fully integrated with the extracellular mineralization mechanism and the physicochemical structure development of the mineralization particles.

    The mechanism of biomineralization: Progress in mineralization from intracellular generation to extracellular deposition · 2023 · DOI

  • Strict observation of the indications and individual assessment of each clinical case is needed when using injection molded material for denture framework production in edentulous areas posterior to natural teeth.

    COMPARATIVE SIMULATION TESTINGWITH FUNCTIONAL LOADING OF TWO DENTURE FRAMEWORK MATERIALS – A PILOT STUDY · 2022 · DOI

  • Considering the limitation of this study, the results presented DFDBBX particles as potential bone filler candidates.

    In Vivo Analyses of Osteogenic Activity and Bone Regeneration Capacity of Demineralized Freeze-Dried Bovine Bone Xenograft: A Potential Candidate for Alveolar Bone Fillers · 2021 · DOI

  • SIGNIFICANCE: Modern surface treatments and innovative alloys developed for dental implants are not completely understood regarding their integrity during long-term clinical function, especially when considering the bio-tribocorrosion process.

    Innovative surfaces and alloys for dental implants: What about biointerface-safety concerns? · 2021 · DOI

  • Further translational and clinical studies are warranted to establish photofunctionalized titanium mesh as a novel clinical tool for better bone regeneration and augmentation.

    Bone Generation Profiling Around Photofunctionalized Titanium Mesh · 2016 · DOI

  • The effects of aspirin, acetaminophen, opioids, adjuvants, anticoagulants and antibiotics in implant fixations are not fully understood, but studies are being carried out to investigate potential ramifications.

    Systemic drugs that influence titanium implant osseointegration · 2016 · DOI

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57 open questions have been extracted from the limitations and future-work passages of 1,355 Bone Tissue Engineering Materials papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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