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Open research questions in Periodontal Regeneration and Treatments

192 unresolved questions extracted from the limitations and future-work sections of 3,125 Periodontal Regeneration and Treatments papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Despite growing interest, the clinical benefits of combining APCs with bovine‐derived bone grafts (BBG) in the treatment of intrabony periodontal defects remain uncertain.

    The Efficacy of Adjunctive Platelet Concentrates in Combined Guided Tissue Regeneration and Bovine Bone Grafting for Intrabony Defects: A Systematic Review · 2026 · DOI

  • Within the limitations of this study, the novel ternary hydrogel prepared using HA, CS and PVA demonstrated cytocompatibility, degradation rate compatible with peri- odontal tissue regeneration, appropriate water uptake and mechanical strength, as well as clinically acceptable handling characteristics.

    A novel composite hyaluronic acid/chitosan/polyvinyl alcohol ternary hydrogel scaffold for periodontal regeneration: an experimental study · 2026 · DOI

  • Intraoral high-frequency ultrasonography (US) offers a radiation-free alternative with potential for sub-millimeter resolution, the validity and precision for detecting minute osseous changes have not been established.

    Intraoral Ultrasound for Detection of Alveolar Bone Changes Following Periodontal Surgery: A Prospective Validity and Precision Study · 2026 · DOI

  • The influence of immediate versus delayed loading on TNF-α levels in peri-miniscrew crevicular fluid (PMCF) and gingival crevicular fluid (GCF) remains inadequately explored.

    Influence of Loading Protocols on TNF-α Levels in PeriMiniscrew Crevicular Fluid and Gingival Crevicular Fluid- A Split Mouth Study · 2026 · DOI

  • While its regenerative properties are well-documented, the antimicrobial potential of different PRF preparations remains incompletely understood, particularly against oral pathogens like Streptococcus intermedius.

    Comparative Evaluation of Antimicrobial Efficacy of Leukocyte Platelet-rich Fibrin and Advanced Platelet-rich Fibrin against Streptococcus Intermedius: An In-vitro Study · 2026 · DOI

  • Background/Objectives: Connective tissue grafting (CTG) has been proposed to enhance ridge contour at pontic sites; however, its long-term volumetric stability remains unclear.

    Volumetric Changes at Pontic Sites After Connective Tissue Grafting: A Systematic Review · 2026 · DOI

  • Accelerating effects have also been described in animal models with exposure to nicotine,59 alcohol,75 and cyclosporine A;68 however, these latter substances compromise bone and periodontal quality, which represents a significant limitation for their clinical use.

    Pharmacological Modulation of Orthodontic Tooth Movement: Mechanisms, Clinical Implications, and Emerging Therapeutic Approaches. A Review · 2026 · DOI

  • 10 Conclusion Although intraosseous therapies use autologous cells and biocompatible materials, immune responses continue to be a Intraosseous treatments have become a potential method for stimulating tissue regeneration and repair, specifically…

    Intraosseous therapy: harnessing the potential of tissue regeneration and repair · 2026 · DOI

  • Despite encouraging findings, several limitations exist: 1. Very limited number of clinical studies. 2. Lack of standardized concentration and preparation protocols. 3. Variability in centrifugation systems. 4. Limited information regarding long-term stability and degradation. 5. Absence of histologic evidence confirming true periodontal regeneration. 6. Uncertainty regarding the ideal dose of vitamin D3.

    Calciferol-Augmented Platelet-Rich Fibrin: A Promising Strategy for Periodontal Tissue Engineering and Regeneration · 2026 · DOI

  • Future research should focus on: • Randomized controlled clinical trials with larger sample sizes • Histologic evaluation of newly formed periodontal tissues • Comparison of calciferol-PRF with conventional PRF and bone grafts • Investigation of optimal vitamin D3 concentration • Evaluation of injectable PRF and advanced PRF formulations containing calciferol • Development of commercially standardized vitamin-enhanced PRF kits Emerging evidence also suggests that combining calciferol-augmented PRF with stem cells, bioactive ceramics or growth factors may further improve regenerative…

    Calciferol-Augmented Platelet-Rich Fibrin: A Promising Strategy for Periodontal Tissue Engineering and Regeneration · 2026 · DOI

  • A major strength of this review is that it is the first meta-analysis synthesising evidence specifically biotype–Schneiderian examining membrane a quantitative foundation for clinical interpretation. Additionally, the inclusion of only observational human studies increases clinical utility, and the use of AXIS and Newcastle–Ottawa Scale for bias assessment ensured evaluation.

    A Systematic review and Meta-analysis of studies assessing correlation between Gingival biotype and Schneiderian membrane thickness · 2026 · DOI

  • of lack sizes, sample approaches, randomisation, inconsistent reporting of confounders, and heterogeneity in periodontal status. The cross- studies prevents sectional nature of establishing causation and indicates the need for longitudinal research. Publication bias assessment, although statistically fully exclude suppressed negative findings.

    A Systematic review and Meta-analysis of studies assessing correlation between Gingival biotype and Schneiderian membrane thickness · 2026 · DOI

  • The biological rationale for tissue-specific efficacy of different autologous platelet concentrate formulations (leukocyte-rich PRP, leukocyte-poor PRP, PRF, i-PRF) has not been adequately tested across a standardized panel of musculoskeletal tissues (tendon, ligament, cartilage, muscle) with matched preparation variables and outcome assessment endpoints.

    Autologous Platelet Concentrates in Sports Medicine: Mechanisms of Tissue Regeneration and Clinical Applications – A Narrative Review · 2026 · DOI

  • Early postoperative outcomes in ligament reconstruction show only modest and inconsistent improvements with PRP despite meta-analytic data, but mechanisms underlying the inconsistency—relating to variation in platelet concentration, fibrin architecture, inflammatory profile, or rehabilitation protocol timing—have not been systematically investigated.

    Autologous Platelet Concentrates in Sports Medicine: Mechanisms of Tissue Regeneration and Clinical Applications – A Narrative Review · 2026 · DOI

  • Clinical studies of autologous platelet concentrates frequently omit complete biologic characterization including baseline whole-blood characteristics, final platelet/leukocyte/erythrocyte composition, activation method details, and growth factor quantification; standardized reporting of these preparation variables is necessary for cross-trial comparison.

    Autologous Platelet Concentrates in Sports Medicine: Mechanisms of Tissue Regeneration and Clinical Applications – A Narrative Review · 2026 · DOI

  • Knee osteoarthritis studies with PRP show symptomatic improvement in pain and function, but structural cartilage regeneration remains insufficiently demonstrated; high-quality trials specifically designed to assess structural improvement through imaging biomarkers and load-tolerance restoration in physically active patient subgroups are lacking.

    Autologous Platelet Concentrates in Sports Medicine: Mechanisms of Tissue Regeneration and Clinical Applications – A Narrative Review · 2026 · DOI

  • ACL reconstruction trials using autologous platelet concentrates demonstrate heterogeneous protocol designs and comparator arms that undermine robust assessment of graft maturation, tunnel widening, and structural healing outcomes; standardized surgical timing, injection intervals, and imaging protocols for ligament reconstruction are needed.

    Autologous Platelet Concentrates in Sports Medicine: Mechanisms of Tissue Regeneration and Clinical Applications – A Narrative Review · 2026 · DOI

  • Studies examining hamstring injuries with autologous platelet concentrates lack standardized return-to-play criteria, consistent rehabilitation intensity protocols, and uniform PRP composition specifications, preventing meaningful outcome comparison and development of generalizable treatment algorithms for acute muscle strain management.

    Autologous Platelet Concentrates in Sports Medicine: Mechanisms of Tissue Regeneration and Clinical Applications – A Narrative Review · 2026 · DOI

  • High-quality clinical trials have not adequately validated the theoretical tissue-specific matching of leukocyte-rich versus leukocyte-poor PRP formulations in tendon versus intra-articular applications, nor have they demonstrated whether PRF and i-PRF's fibrin-based scaffold properties and slower growth factor release kinetics provide superior outcomes in chronic lesions or poorly vascularized tissues.

    Autologous Platelet Concentrates in Sports Medicine: Mechanisms of Tissue Regeneration and Clinical Applications – A Narrative Review · 2026 · DOI

  • Future research should investigate the potential synergistic effects of 1.2% SIM gel combined with bone grafts (xenografts) and resorbable membranes to optimize multidimensional preservation.

    Efficacy of topical application of simvastatin gel combined with a collagen sponge carrier in preserving alveolar ridge dimensions: a triple-blind randomized clinical trial · 2026 · DOI

  • PRP and PRGF have not been studied as a "single/sole" substitute for a one-stage lateral window approach, probably because of the weak physical characteristics of the membranes.

    <scp>APCs</scp> in sinus floor augmentation · 2024 · DOI

  • Due to the limited number of studies and heterogeneity of the data, conflicting evidence emerged for the differential response to NSPT of intrabony and suprabony defects.

    Do Intrabony Defects Have a Worse Clinical Response to Step 2 of Periodontal Therapy and Repeated Subgingival Instrumentation Compared with Suprabony Defects? A Systematic Review · 2024 · DOI

  • Notably, the regeneration of cementum and functional PDL fibers perpendicularly inserted into the root surface and the alveolar bone was limited to the defects treated with multi-compartment fiber-guiding or ion-containing 3D scaffolds.

    Three-dimensional-printed scaffolds for periodontal regeneration: A systematic review · 2023 · DOI

  • However, for such an approach, a histological evaluation of the nature of the reconstructed tissues is still lacking, and the presurgery conditions (eg, probing depth, defect severity, and defect morphology), which may benefit in terms of invasiveness, have not yet been defined; and (d) intraoperative and postoperative low-level laser biostimulation of the defect site may favorably modulate the postoperative course.

    Minimal invasiveness in the surgical treatment of intraosseous defects: A systematic review · 2023 · DOI

  • The efficacy of different GBR-supported reconstructive measures as well as their potential superiority compared to non-GBR-supported treatment strategies for bone defects at peri-implantitis sites, however, remains unclear.

    Clinical efficacy of guided bone regeneration in peri‐implantitis defects. A network meta‐analysis · 2023 · DOI

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192 open questions have been extracted from the limitations and future-work passages of 3,125 Periodontal Regeneration and Treatments 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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