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Open research questions in Bone and Dental Protein Studies

55 unresolved questions extracted from the limitations and future-work sections of 935 Bone and Dental Protein Studies papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Beyond statistical significance, the increased release of TGF-β1 observed in the present study is biologically mean- ingful, although a definitive threshold for TGF-β1 concen- tration required for optimal regeneration remains unclear. Although enhanced release of TGF-β1 may support regenerative processes, a definitive threshold for the opti- mal concentration required for dentin–pulp regeneration remains unclear.

    Er:YAG Laser–activated simvastatin-loaded nanochitosan irrigant enhances TGF-β1 release from root dentin: an in-vitro study · 2026 · DOI

  • Within the limitations of this study, it can be concluded that: • Selective caries removal and clean enamel margins restored with SMART restorations, combined with professional preventive measures every 3 months maintained the integrity of restorations in permanent molars with severe and moderate MIH for up to 1 year.

    Effectiveness of silver diamine fluoride in managing hypersensitivity of molar-incisor hypomineralization affected molars: a scoping review · 2026 · DOI

  • Gli transcription factors (TFs) are established as primary effectors of HH signaling, yet their distinct roles and regulatory mechanisms in governing cell commitment and differentiation of postmigratory CNCCs remain poorly understood.

    Gli2 and Gli3 synergistically mediate HH-TGF-β crosstalk in mesenchymal progenitor cells to orchestrate tooth root morphogenesis · 2026 · DOI

  • The precise drivers of tooth eruption remain unclear but may involve coordinated processes such as alveolar bone remodeling,30,31 periodontal ligament transformation,32 and proper matrix formation.

    Kdf1 missense mutation caused enamel defects by disrupting cell adhesion and Hippo-YAP signaling in dental epithelium · 2026 · DOI

  • This has important functional implications for vectorial Ca2+ transport in ameloblast cells, and thus enamel forma- tion, and warrants further investigation.

    Functional model for amelogenesis: polarization and pH sensitivity of calcium uptake in ameloblast-derived HAT-7 cells · 2026 · DOI

  • We used a rat-derived ameloblast-like cell line as a model to investigate the transport processes relevant to amelogenesis. Such in vitro systems inherently possess several limitations, including discrepancies between the cellular environments in vitro and in vivo (e.g. differences in cell–cell and cell– matrix interactions), altered gene expression profiles in primary versus immortalized cells, and genetic drift during successive passaging [38], all of which constrain the inter- pretation and generalizability of our findings.

    Functional model for amelogenesis: polarization and pH sensitivity of calcium uptake in ameloblast-derived HAT-7 cells · 2026 · DOI

  • The cross-sectional design of the present study limited the ability to establish causal relationships between potential etiological factors and the occurrence of MIH and HPSM. Although standardized diagnostic criteria were followed, the examinations were conducted under field conditions in school settings using natural daylight, which may have been less sensitive than examinations performed in a fully equipped clinical environment. Teeth were examined in a wet condition without professional prophylaxis or air drying, which may have resulted in underdiagnosis of mild demarcated opacities. The relatively low number of positive cases also reduced the statistical power for subgroup analyses. Variables such as detailed prenatal and postnatal medical history, environmental exposures, and socioeconomic status were not assessed in the present study. Although the stratified sampling method provided representative coverage across Ahmedabad, the findings may not be generalizable to broader populations or different geographic regions. 2026 Parmar et al. Cureus 18(5): e109072.

    Prevalence and Distribution of Molar Incisor Hypomineralization (MIH) and Hypomineralized Primary Second Molar (HPSM) Among Children Aged 7-11 Years Residing in Ahmedabad, India: A Prospective, Observational Cross-Sectional Study · 2026 · DOI

  • However, the endogenous mechanism by which epithelial Wnt10a regulates Hertwig’s epithelial root sheath (HERS) cellular behaviors and contributes to root furcation patterning remains unclear.

    A Wnt10a-Notch signaling axis controls Hertwig’s epithelial root sheath cell behaviors during root furcation patterning · 2024 · DOI

  • Additionally, macrophages and activated lymphocytes highly express SPP1 in atherosclerotic plaques, which promote the formation of fatty streaks and plaque development, and SPP1 is also involved in the calcification process of atherosclerotic plaques that results in heart failure, but the crosstalk between SPP1-mediated immune cells and VC has not been adequately addressed.

    Osteopontin/SPP1: a potential mediator between immune cells and vascular calcification · 2024 · DOI

  • Therapeutic dentin regeneration remains difficult to achieve, and a majority of the attention has been given to anabolic strategies to promote dentinogenesis directly, whereas, the available literature is insufficient to understand the role of inflammation and inflammatory complement system on dentinogenesis.

    The role of complement C5a receptor in DPSC odontoblastic differentiation and in vivo reparative dentin formation · 2022 · DOI

  • We and others have previously demonstrated that the ribosomal S6 kinase RSK2, mutated in CLS, is essential for bone and cementum formation; however, it remains to be established whether RSK2 plays also a role in mechanically induced bone remodeling during orthodontic tooth movement (OTM).

    Accelerated tooth movement in Rsk2-deficient mice with impaired cementum formation · 2020 · DOI

  • CONCLUSIONS: Within the limitations of this study, it could be concluded that EMD with a concentration of 10, 50, or 100 μg/mL has no appreciable effect on osteoblastic differentiation of BMSCs and PDLSCs.

    Osteoblastic Differentiation of Human Stem Cells Derived from Bone Marrow and Periodontal Ligament Under the Effect of Enamel Matrix Derivative and Transforming Growth Factor-Beta · 2013 · DOI

  • Since little is known about the tissue itself, Brian Foster of the National Institutes of Health, Maryland, USA, compared different staining techniques to differentiate acellular and cellular cementum from surrounding dentin, bone and ligament structures in mouse, porcine and human teeth.

    Methods for studying tooth root cementum by light microscopy · 2012 · DOI

  • These data indicate that many secreted and membrane-embedded EO proteins still remain to be identified, some of which may play crucial roles in regulating processes that create an optimal environment for the formation and organization of apatite crystals into a complex three-dimensional calcified matrix.

    Identification of secreted and membrane proteins in the rat incisor enamel organ using a signal‐trap screening approach · 2006 · DOI

  • These data reveal that a single application of up to 50 microg/tooth of exogenous recombinant BMP-7 is insufficient to induce reparative dentinogenesis in ferret teeth with reversible pulpitis.

    Treatment of inflamed ferret dental pulps with recombinant bone morphogenetic protein‐7 · 2000 · DOI

  • Mean counts of the immunolabeled cells in the control group showed the highest number of CD11b+ and class II molecule expressing cells, while CD4+ and CD43+ cells were scarcely found.

    Immunocompetent cells in rat periodontal ligament and their recruitment incident to experimental orthodontic tooth movement · 1997 · DOI

  • Possible modulation of this slow growth by the presence of 20-kDa amelogenin as a weak inhibitor or a space-filling matrix through the secretory stage is still a very open question.

    Function of Amelogenins in Porcine Enamel Mineralization During the Secretory Stage of Amelogenesis · 1987 · DOI

  • Several studies have determined that relaxin stimulates differentiation and regulates the activity of mature osteoclasts, but little is known about its effect on the differentiation of mesenchymal cells towards the osteogenic lineage.

    Relaxin treatment stimulates the differentiation of mesenchymal stem cells into osteoblasts · 2023 · DOI

  • Currently, etiologies remain unknown but the various studies tend towards a multifactorial model with several systemic, genetic and/or epigenetic factors, acting in a synergistic or additive way.

    Que faut-il savoir, à l’heure actuelle, sur les hypominéralisations molaires incisives (MIH) et les hypominéralisations des secondes molaires temporaires (HSPM) ? · 2023 · DOI

  • The unique function of the epithelial cells synthesizing crystallites and assembling them in a mechanically robust structure is not fully elucidated yet, partly due to limitations with in vitro experimental models.

    Adult dental epithelial stem cell-derived organoids deposit hydroxylapatite biomineral · 2023 · DOI

  • Direct restoration of enamel structural defects must be carefully monitored and re-treatment performed if necessary, indicating a need for long-term follow-up studies.

    Resin composites direct restoration of enamel structural defects – case report · 2022 · DOI

  • Although it has been demonstrated that exposure of lactating rats to CrVI delays tooth eruption, the effects of CrVI exposure on bone remodeling in the developing alveolus during tooth eruption remain unknown.

    Hexavalent chromium exposure alters bone remodeling in the developing tooth alveolus and delays tooth eruption · 2021 · DOI

  • This article presents enamel rods in Hunter–Schreger Bands under light microscopy and polarized microscopy which has rarely been reported with additional note on incipient lesion visualized under polarized microscopy.

    Visualization of enamel rods in hunter-schreger bands and enamel in incipient lesion under polarized and light microscopy · 2020 · DOI

  • basilicum could be a smart ostoeinductive agent where BM-MSCs should be investigated further.

    Effect of Ocimum basilicum on mesenchymal stem cell proliferation and differentiation: Does the effect change according to niches? · 2017 · DOI

  • Several aspects of cementogenesis remain unclear, including differences between acellular cementum and cellular cementum, and between cementum and bone.

    Counter-regulatory phosphatases TNAP and NPP1 temporally regulate tooth root cementogenesis · 2014 · DOI

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55 open questions have been extracted from the limitations and future-work passages of 935 Bone and Dental Protein Studies 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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