Efficacy of Human Chorion Membrane Allograft for Recession Coverage: A Case Series

The Categorization of Perinatal Derivatives for Orthopedic Applications

Musculoskeletal (MSK) pathology encompasses an array of conditions that can cause anything from mild discomfort to permanent injury. Their prevalence and impact on disability have sparked interest in more effective treatments, particularly within orthopedics. As a result, the human placenta has come into focus within regenerative medicine as a perinatal derivative (PnD). These biologics are sourced from components of the placenta, each possessing a unique composition of collagens, proteins, and factors believed to aid in healing and regeneration. This review aims to explore the current literature on PnD biologics and their potential benefits for treating various MSK pathologies. We delve into different types of PnDs and their healing effects on muscles, tendons, bones, cartilage, ligaments, and nerves. Our discussions highlight the crucial role of immune modulation in the healing process for each condition. PnDs have been observed to influence the balance between anti- and pro-inflammatory factors and, in some cases, act as biologic scaffolds for tissue growth. Additionally, we assess the range of PnDs available, while also addressing gaps in our understanding, particularly regarding biologic processing methods. Although certain PnD biologics have varying levels of support in orthopedic literature, further clinical investigations are necessary to fully evaluate their impact on human patients.

Comparison Between Autologous Albumin Gel and Liquid Platelet-Rich Fibrin Mixture Versus Connective Tissue Graft to Modify the Gingival Phenotype: A Randomized Controlled Trial

Objectives To assess changes in gingival thickness (GTH) and the width of keratinized gingival tissue (KTW) following treatment with either connective tissue graft (CTG) or an albumin gel-platelet-rich fibrin mixture (Alb-PRF). Materials and methods Twenty treatment sites were included in a split-mouth design involving 10 patients with a thin gingival phenotype in the mandibular anterior region. The sample was randomly divided into two groups, with the Alb-PRF applied to the experimental group and CTG used for the control group. GTH and KTW were measured at baseline and after one, three, and six months. Results GTH increased in both groups during all follow-up periods. However, no statistically significant differences (p > 0.05) between the groups were observed at baseline and six months. At three months, the experimental group exhibited significantly higher GTH (p < 0.001). Additionally, at three and six months, the CTG group showed a superior increase in KTW (p < 0.05). Conclusion Within the constraints of this study, Alb-PRF application for modifying thin gingival phenotypes proved to be an effective therapeutic option, potentially serving as an alternative to CTGs. Although Alb-PRF resulted in thicker gingiva, CTG demonstrated a greater enhancement in KTW.

Amniotic membrane versus platelet-rich fibrin in treatment of gingival recession- a randomized control trial

Objective

To determine the efficacy of latelet-rich fibrin (PRF) and Amniotic membrane (AM) along with the coronally advanced flap (CAF) technique in treating Miller's class I gingival recession (GR) defects.

Material and methods

A total of 32 sites with Miller's class I GR defects were distributed into Group A (CAF + PRF, n = 16) and Group B (CAF + AM, n = 16). Clinical parameters like gingival index (GI), plaque index (PI), gingival bleeding index (GBI), gingival sulcus depth (GSD), relative attachment level (RAL), and gingival marginal level (GML) were measured at baseline and at 3, 6 and 9 months after surgical intervention.

Results

PRF and AM with CAF were effective treatment modalities for treating Miller's class I GR defects, with an average root coverage value of 2.00 ± 0.75 mm in Group A and 1.5 ± 0.3 mm in Group B. Complete coverage (100 %) was obtained in 57 % sites of group A and 49 % sites of group B. At the 9-month follow-up, there was a significant increase in relative attachment levels in both groups when compared to baseline.

Conclusion

In the present study it was observed that there was a clinically and statistically significant improvement in root coverage with both groups. PRF-treated sites showed > 50 % complete coverage and hence were superior. AM showed comparable results to PRF and could be used as an alternative.

The Preparation and Clinical Efficacy of Amnion-Derived Membranes: A Review

Biological tissues from various anatomical sources have been utilized for tissue transplantation and have developed into an important source of extracellular scaffolding material for regenerative medicine applications. Tissue scaffolds ideally integrate with host tissue and provide a homeostatic environment for cellular infiltration, growth, differentiation, and tissue resolution. The human amniotic membrane is considered an important source of scaffolding material due to its 3D structural architecture and function and as a source of growth factors and cytokines. This tissue source has been widely studied and used in various areas of tissue repair including intraoral reconstruction, corneal repair, tendon repair, microvascular reconstruction, nerve procedures, burns, and chronic wound treatment. The production of amniotic membrane allografts has not been standardized, resulting in a wide array of amniotic membrane products, including single, dual, and tri-layered products, such as amnion, chorion, amnion-chorion, amnion-amnion, and amnion-chorion-amnion allografts. Since these allografts are not processed using the same methods, they do not necessarily produce the same clinical responses. The aim of this review is to highlight the properties of different human allograft membranes, present the different processing and preservation methods, and discuss their use in tissue engineering and regenerative applications.

Human amniotic membrane as a multifunctional biomaterial: recent advances and applications

The developing fetus is wrapped by a human amniotic membrane or amnion. Amnion is a promising human tissue allograft in clinical application because of its chemical composition, collagen-based, and mechanical properties of the extracellular matrix. In addition, amnion contains cells and growth factors; therefore, meets the essential parameters of tissue engineering. No donor morbidity, easy processing and storage, fewer ethical issue, anti-inflammatory, antioxidant, antibacterial, and non-immunogenic properties are other advantages of amnion usage. For these reasons, amnion can resolve some bottlenecks in the regenerative medicine issues such as tissue engineering and cell therapy. Over the last decades, biomedical applications of amnion have evolved from a simple sheet for skin or cornea repair to high-technology applications such as amnion nanocomposite, powder, or hydrogel for the regeneration of cartilage, muscle, tendon, and heart. Furthermore, amnion has anticancer as well as drug/cell delivery capacity. This review highlights various ancient and new applications of amnion in research and clinical applications, from regenerative medicine to cancer therapy, focusing on articles published during the last decade that also revealed information regarding amnion-based products. Challenges and future perspectives of the amnion in regenerative medicine are also discussed.

A split-mouth randomised controlled trial comparing the clinical effects of MVISTA with chorion membrane or connective tissue graft in multiple gingival recessions

Objectives

Modified form of VISTA (MVISTA), a novel surgical procedure, aims at comprehensive root coverage that maintains the inner continuity of the periosteum and papilla. This technique incorporates any regenerative graft material within the tunnel. The objective of study is to compare the MVISTA for treating multiple adjacent gingival recessions and chorion membranes or grafts of connective tissues.

Materials and methods

This is a split-mouth type randomized trial. In this trial total of 18 patients were considered. The patients in this trial had multiple adjacent, gingival recessions of Miller's Classes I/II, and they were randomized to either the MVISTA with chorion membrane (test) or connective tissue graft (CTG) (control) group. A baseline and one year after surgery were considered for recording to mean root coverage (MRC), complete root coverage (CRC), and clinical periodontal parameters. An intragroup comparison was made.

Results

The intragroup comparison of recession depth baseline and 12 months after-surgery record found a significant difference between the two groups (P = 0.00). In the postoperative condition, the depth of recession reduction was higher in the test group than in the control group. However, from a statistical perspective, the difference was insignificant (P > 0.05). At the end of the year, it was found that the width of the keratinized tissue had increased significantly (P < 0.05). The MRC in the test group was significantly higher (91.33 %±8.17 %) than that in the control group (89.46 %±11.22 %) (P > 000). At the end of 1 year, the test group showed 66.67 % CRC compared to 44.44 % in the control group. The gingival phenotype displayed statistically significant improvement in the test group (p = 0.004). PD and CAL showed statistically nonsignificant outcomes (P > 0.05).

Conclusions

As far as multiple adjacent gingival recession treatment is concerned, MVISTA with chorion membrane treatment enhanced the gingival phenotype, restored complete root coverage (66.6%), and increased the width of keratinized tissue. CTG and CM demonstrated good root coverage results; the latter might be used as a substitute graft to treat multiple recessions.

Evaluation of the Hyaluronic Acid Versus the Injectable Platelet-Rich Fibrin in the Management of the Thin Gingival Phenotype: A Split-Mouth Randomized Controlled Clinical Trial

Background

Several procedures have been used to enhance thin gingival phenotype and the majority of these procedures have been surgical. A new minimally invasive approach that involved multiple injections of platelet-rich fibrin (i-PRF) to enhance the thin gingival phenotype has been proposed. As the hyaluronic acid (HA) and the i-PRF share similar properties in terms of promoting periodontal regeneration, the present trial aimed to evaluate the effectiveness of multiple injections of the i-PRF in patients with thin gingival phenotypes in comparison with those of the HA in increasing the gingival thickness (GT) and the keratinized tissue width (KTW).

Materials and methods

Eighty-four sites from 14 systematically healthy patients who had thin gingival phenotypes (GT ≤1 mm) were included in this split-mouth randomized controlled trial. For each patient, each side of the anterior mandible was randomly allocated to one of the two materials (HA or i-PRF). In the HA group, the selected sites of the gingiva were injected with cross-linked HA using a 30-gauge microneedle. In the i-PRF group, the i-PRF was injected in the same manner. This procedure was repeated in both groups three times with intervals of 7 days. The GT, KTW, and periodontal indices: gingival index (GI), bleeding on probing (BOP), and probing depth (PD) were measured at baseline, 1 month, and 3 months following the initial injection.

Results

The GT increased significantly in both groups at the three assessment times (p<0.001). The KTW also showed a statistically significant increase in the intragroup comparisons in both groups (p<0.05). No statistically significant difference was observed between the two groups at the three assessment times for the GT and the KTW (p>0.05).

The GI significantly decreased after 1 month and 3 months compared to the baseline values in both groups (p<0.05). The intergroup comparisons for the GI revealed no statistically significant differences at the three assessment times (p>0.05). As for the BOP and the PD, no statistically significant differences were found between the three assessment times (p>0.05) and between the two groups at each assessment time (p>0.05).

Conclusion

Multiple injections of the i-PRF and the HA in the thin gingival phenotype resulted in an increased GT and increased KTW, with no statistically significant differences between the two methods. Both minimally invasive techniques were more effective in improving the GT rather than the KTW.

Chorion and amnion/chorion membranes in oral and periodontal surgery: A systematic review

The aim of this study was to perform a systematic review on the clinical applications where chorion membrane (CM) and amnion/chorion membrane (ACM) were used for oral tissue regeneration procedures. Selection of articles was carried out by two evaluators in Pubmed and Scopus databases, and Outcomes (PICO) method was used to select the relevant articles. Clinical studies reporting the use of CM or ACM for oral soft and hard tissue regeneration were included. The research involved 21 studies conducted on 375 human patients. Seven clinical applications of CM and ACM in oral and periodontal surgery were identified: gingival recession treatment, intrabony and furcation defect treatment, alveolar ridge preservation, keratinized gum width augmentation around dental implants, maxillary sinus membrane repair, and large bone defect reconstruction. CM and ACM were compared to negative controls (conventional surgeries without membrane) or to the following materials: collagen membranes, dense polytetrafluoroethylene membranes, platelet-rich fibrin membranes, amnion membranes, and to a bone substitute. Several studies support the use of CM and ACM as an efficient alternative to current techniques for periodontal and oral soft tissue regeneration procedures. However, further studies are necessary to increase the level of evidence and especially to demonstrate their role for bone regeneration.

Gingival Biotype: A Secret for Esthetic Success

Gingival biotype, in the recent years, has gained substantial interest as one of the important pillars for esthetic success. This review provides recommendations to be considered prior to performing any dental procedure to attain best clinical results. Several methods for measuring biotype have been suggested. Gingiva is often subjected to various insults during routine dental procedures. Hence, understanding the gingival biotype can provide insights into precautions rendered necessary during tissue handling to avoid undesirable treatment outcomes.

Bilaminar Technique with Coronally Advanced Flap and Cryopreserved Human Amniotic Membrane in the Treatment of Gingival Recessions

Gingival recessions are usually treated with surgical therapies which involve the use of connective tissue autograft in order to thicken the gingival tissue. This has an important biological repercussion on patients since they will have surgical wounds in two different oral cavity sites. In this case report, we offer an alternative technique for the treatment of a Miller class I gingival recession. A 40-year-old female patient has been treated with a combination of bilaminar and coronally advance flap techniques to cover a Miller class I gingival recession with addition of cryopreserved human amniotic membrane. The human amniotic membrane has been employed to thicken the keratinized tissue. The human amniotic membrane in combination with bilaminar and coronally advance flap techniques has produced aesthetically and functionally satisfying results, covering completely the gingival recession and restoring the natural colour and thickness of the gingiva. Bilaminar technique with coronally advanced flap and cryopreserved human amniotic membrane is a valid alternative in treating Miller class I and II gingival recessions and reduce the biological morbidity of a double intervention.

Amniotic Membrane In Palatal Epithelial-Connective Tissue Reconstruction

Mucogingival surgery has the objective to obtain coverage of the recession, with a favorable long-term prognosis, but also to minimize postoperative problems and surgery-related risks. Human amniotic membrane is increasingly employed for periodontal tissue repair in order to promote epithelialization and to reduce pain and scar tissue formation. A 38-year-old female patient reports dental hypersensitivity resulting from gingival recession affecting tooth 4.1. A mucogingival surgical procedure was proposed and a partial-thickness flap of epithelial-connective tissue was harvested from the palate and grafted on to the receiving site. The amniotic membrane was positioned at the donor site to reduce postoperative morbidity and to encourage rapid palatal healing. One week after the application of HAM (human amniotic membrane), the wound was healed and 1 month after the donor site was completely re-epithelialized. The present case report suggests that in the surgical treatment of gingival recession with palatal epithelial-connective tissue graft, HAM promotes rapid epithelialization of the palatal donor site wound with a reduction in morbidity.

Objective evaluation of healing and esthetic outcome of root coverage procedure using chorion membrane: a case series

The ultimate goal of any periodontal plastic surgery aimed to treat gingival recession is predictable recession coverage and esthetic outcome. Due to the post-operative morbidity and discomfort related to subepithelial connective tissue graft, various other methods have been introduced including the use of fetal membranes. The fetal membranes have shown promising results in medicine and recently in the field of regenerative dentistry and could possibly become a viable alternative to autogenous grafts. This article reports a series of cases of Miller's class I gingival recession that were treated by chorion membrane combined with coronally advanced flap and evaluated using objective variables for post-operative healing and esthetics. Nine systemically healthy subjects with ten Miller's class I buccal gingival recession were included in the study. Clinical parameters were recorded at baseline, 3 months and 6 months post-surgery; wound healing index (WHI) was recorded one week post-surgery. At the end of 6 months, the percentage of root coverage and the root coverage esthetic score (RES) were calculated. The results showed statistically significant (p < 0.05) improvement in most of the parameters. The mean percentage of root coverage obtained was 62.20 ± 21.99% ranging from 33.3 to 100%. The WHI showed excellent healing score and RES assessed at the end of six months showed superior esthetic results. The chorion membrane along with coronally advanced flap is a predictable procedure for root coverage with better post surgical healing and superior esthetics.

[Research progress on substitutes for autogenous soft tissue grafts in mucogingival surgery]

Mucogingival surgery is a general term for periodontal surgeries that correct aberrant periodontal soft tissues. Conventional mucogingival surgeries with pedicle flap or autologous soft tissue graft for treatment of gingival recession and insufficient keratinized tissues are always related to disadvantages such as need for a second surgery site, limited supplies, and complaints for postoperative discomfort. In this regard, research and application of soft tissue substitutes have gained increasing attention. Various kinds of soft tissue substitutes, including acellular dermal matrix and xenogeneic collagen matrix, have been developed and applied to clinical treatment. This review aims to summarize advances in research of the characteristics and clinical effectiveness of several soft tissue substitutes and provide references for clinical application.

Comparative evaluation of human chorion membrane and platelet-rich fibrin membrane with coronally advanced flap in treatment of Miller's class I and II recession defects: A randomized controlled study

BACKGROUND

Root coverage procedures have gained much popularity in recent years, due to increasing esthetic demands of patients. Coronally advanced flap (CAF) is a predictable technique for treating gingival recessions. Platelet-rich fibrin (PRF), an autologous platelet concentrate, has properties to enhance soft-tissue wound healing. A current method in dentistry is the use of human chorion membrane, a placental derivative, having biologic properties that help in healing and regeneration. Thus, the aim of the study was evaluation and comparison of the efficacy of chorion membrane and PRF membrane in the treatment of Miller's Class I and Class II recession defects.

MATERIALS AND METHODS

This was a randomized controlled clinical study. Totally 30 sites with Miller's Class I and Class II recession were taken and randomly allocated to chorion membrane (test) PRF membrane (control) group. The clinical parameters recorded were clinical attachment level (CAL), recession height (REC-HT), recession width (REC-WD), width of keratinized gingiva (WKG) and gingival tissue thickness (GTH).

RESULTS

Significant differences were seen from baseline to 6 months in test group regarding gain in CAL (P < 0.001), reduction in REC-HT (P < 0.001), decrease in REC-WD (P = 0.02), increase in WKG (P < 0.001), and increase in GTH (P < 0.001). In the control group also, significant difference was noted at the end of 6 months i regarding gain in CAL (P < 0.001), reduction in REC-HT (P < 0.001), decrease in REC-WD (P = 0.029), increase in WKG (P < 0.001), and increase in GTH (P < 0.001). Intergroup analysis showed significant differences between test and control groups at the end of 6 months, with CAL, REC-HT, WKG, and GTH showing statistically significant differences with P = 0.002, 0.001, 0.001, and 0.026, respectively. No significant difference was seen regarding REC-WD (P = 0.39).

CONCLUSIONS

Both are effective materials in root coverage, but chorion membrane showed better and more stable results at the end of 6 months as compared to PRF membrane in treating gingival recession.

Comparative evaluation of clinical efficacy of coronally advanced flap alone and in combination with placental membrane and demineralized freeze-dried bone allograft in the treatment of gingival recession

Background:

Guided tissue regeneration is a very commonly employed technique for treating recession defects. However, achieving the required space beneath the membrane is often difficult.

Aim and Objectives:

The purpose of the present study was to compare and evaluate the clinical efficacy of coronally advanced flap (CAF) alone or in combination with amnion membrane (AM) or chorion membrane (CM) and demineralized freeze-dried bone allografts (DFDBAs) in the management of gingival recession (GR) defects.

Materials and Methods:

The sample size (Miller's Class I and Class II GR-type defects) consisted of thirty patients which were stratified into three groups randomly (ten for each group). Group A patients were treated with only CAF and Group B patients were treated by CAF in combination with CM and DFDBA. Similarly, Group C patients were treated by CAF in combination with AM and DFDBA. Clinical parameters such as gingival index, GR depth, GR width, relative attachment level, and width of keratinized tissue were assessed at baseline and 3 months postoperatively.

Results:

Inter- and intragroup data were analyzed by paired t-test. The percentage of root coverage obtained in the study groups was 60%, 78%, and 63%, respectively, for Groups A, B, and C. Statistically significant difference was obtained in the clinical parameters of Group B which was treated with CM and DFDBA.

Conclusions:

Combination of DFDBA and placental membrane (chorion/amnion) in CAF procedure provided an additional benefit over CAF alone in the treatment of Class I and II GR defects.

Amnion and Chorion Allografts in Combination with Coronally Advanced Flap in the Treatment of Gingival Recession: A Clinical Study

BACKGROUND

Guided tissue regeneration (GTR) based root coverage using different allograft membranes has been utilized to correct gingival recession defects with promising results. Amnion and chorion allograft membranes of alternative origin derived from human placental tissue has been advocated in the treatment of gingival recession. However, chorion membrane has been used in combination with amnion membrane no study has compared these allograft membranes in the treatment of gingival recession. Therefore, the purpose of this study was to clinically evaluate and compare the efficacy of amnion membrane and chorion membrane in combination with coronally advanced flap in the treatment of gingival recessions.

MATERIALS AND METHODS

Twelve systemically healthy patients having at least 2 bilateral Miller's Class I or Class II gingival recession were recruited and coronally advanced flap was performed with amnion membrane or chorion membrane. Clinical parameters such as gingival Index, plaque index, length of the recession, width of the recession, width of keratinized gingiva, relative attachment level were evaluated at baseline, 3 and 6 months post-surgery.

RESULTS

The mean decrease in length of recession (LR) for Chorion site was 2.00±1.54mm and amnion site was 1.58±1.14mm. The gain in attachment level for amnion site was 2.17±1.53mm and for chorion site was 1.58±1.22mm. The total mean percentage of root coverage was 34% for chorion site and 22% for amnion site.

CONCLUSION

Both amnion membrane and chorion membrane has shown to be versatile allograft material to be used in the treatment of root coverage.