What Is Acellular Dermis and What Are Its Applications in Plastic Surgery?

 Acellular Dermal Matrix (ADM): Applications in Reconstructive Surgery, Benefits, and Limitations

Acellular Dermal Matrix (ADM) is a type of biological biomaterial that has attracted considerable attention in recent years in the fields of plastic surgery, reconstructive surgery, and tissue regeneration. These structures can be placed at the site of tissue damage, where they serve as biological scaffolds and provide a suitable environment for cellular infiltration, vascularization, and tissue regeneration.

Acellular dermal matrices represent part of a new generation of regenerative medicine products designed to combine the advantages of natural tissues with their potential use in a variety of surgical procedures.

In this article, we explore the concept of acellular dermal matrix, its mechanism of action, its applications in plastic and reconstructive surgery, its benefits and limitations, and the acellular dermal matrix membrane developed by Iranian Tissue Product Company (Regen Allograft).

 What Is Acellular Dermal Matrix?

Acellular dermal matrix is a type of dermal matrix in which living cells have been removed through specialized processing techniques while a substantial portion of the extracellular matrix (ECM) structure is preserved.

The skin’s extracellular matrix contains important components, including collagen, elastin, laminin, and glycosaminoglycans. These components play essential roles in the natural structure of the skin and can serve as a biological framework for tissue regeneration.

The removal of cellular components reduces the tissue’s antigenicity. As a result, acellular dermal matrix can be placed at the intended site and gradually interact with host cells and surrounding tissues.

In simple terms, acellular dermal matrix can be described as a cell-free biological scaffold that preserves key elements of the natural dermal structure.

 How Does Acellular Dermal Matrix Work in the Body?

One of the key characteristics of acellular dermal matrices is their potential for biointegration with host tissue.

After the matrix is placed at the intended site, the body’s cells can migrate into its structure. Subsequent processes may include vascularization, fibroblast infiltration, and remodeling of the collagen matrix.

Studies reviewed in the reference article indicate that vascularization of acellular dermal matrix may become observable approximately one to two weeks after implantation. Over time, the matrix undergoes remodeling, and some of its structure is replaced by the patient’s own tissue.

However, the rate and progression of these processes depend on several factors, including the product type, processing method, degree of cross-linking, implantation site, and the patient’s tissue conditions.

 What Are the Main Benefits of Acellular Dermal Matrix?

The use of ADM in reconstructive and plastic surgery has attracted attention because of its structural and biological characteristics.

Some of the key properties discussed in the literature include the following.

Providing a Scaffold for Tissue Regeneration

Acellular dermal matrix can function as a three-dimensional structure into which the body’s cells migrate, supporting the processes involved in tissue regeneration.

Potential for Vascularization and Host Tissue Integration

One of the primary objectives of using ADM is to create conditions that support cellular infiltration and the formation of new blood vessels, ultimately facilitating integration of the matrix with surrounding tissues.

Reduced Antigenicity

Removing cellular components from the tissue is an important step in the production of acellular dermal matrix and can reduce the immune response to the implanted tissue.

Potential to Avoid Donor-Site Tissue Harvesting

In some reconstructive procedures, using a ready-to-use biological matrix may reduce the need to harvest tissue from another part of the patient’s body. However, the appropriate approach depends entirely on the type of tissue defect and the surgeon’s clinical assessment.

 Applications of Acellular Dermal Matrix in Plastic and Reconstructive Surgery

Acellular dermal matrix has been investigated in various areas of plastic surgery and tissue reconstruction. The reference article reviews its applications across several anatomical regions, including the head and neck, chest, breast, abdomen, and extremities.

 Acellular Dermal Matrix in Head and Neck Surgery

Head and neck surgery is one of the important areas in which ADM has been investigated.

Various studies have examined the use of these matrices for applications such as:

 Correction of certain nasal contour irregularities
Soft tissue reconstruction
Repair of nasal septal perforations
Reconstruction of the periorbital region
Reconstruction of selected intraoral defects
Repair of pharyngeal and oral defects
Reconstruction of certain cranial and dural defects

For example, in some nasal surgeries, ADM can be used as a covering layer to correct contour irregularities over the underlying bony and cartilaginous nasal framework.

 Acellular Dermal Matrix in Oral Tissue Reconstruction

Another area in which ADM has been investigated is the reconstruction of mucosal defects within the oral cavity.

Studies reviewed in the reference article have reported the use of ADM in the reconstruction of various anatomical sites, including the tongue, floor of the mouth, jaw, palate, lips, and tonsillar region.

In some cases, ADM has been used as an alternative to split-thickness skin grafts (STSGs) for mucosal reconstruction. Research has also examined its application in the repair of cleft palate and

oronasal fistulas.

 Acellular Dermal Matrix in Breast Surgery

Breast reconstruction is one of the most widely studied applications of ADM.

In implant-based breast reconstruction, acellular dermal matrix can serve as a supporting structure or sling, helping surgeons shape and control the implant pocket.

According to the reference article, ADM has been investigated in several applications, including:

Supporting the inferior pole of the breast
Controlling implant position
Correcting certain deformities following reconstruction
Addressing implant rippling
Correcting implant malposition
Managing certain cases of capsular contracture

However, these findings should not be interpreted as evidence that ADM is necessary or superior for every patient. The reference article emphasizes that high-quality evidence remains insufficient to establish definitive, universally applicable indications. Studies have also reported inconsistent findings regarding complications.

 Acellular Dermal Matrix in Abdominal Wall Reconstruction

Abdominal wall reconstruction is another area in which acellular dermal matrices have been investigated.

One reason for the interest in ADM in this field is its biocompatibility and potential to integrate with host tissue. According to the reviewed literature, these characteristics have led to its consideration in certain complex situations, including some contaminated surgical fields and patients who may be at increased risk of wound-healing complications.

Nevertheless, hernia recurrence, matrix laxity, and other complications may be influenced by several factors, including the type of ADM, its placement, fixation technique, the patient’s condition, and the surgical approach.

Therefore, product selection and the method of use should be determined according to the individual patient’s circumstances and the surgeon’s judgment.

 Applications of ADM in Extremity Reconstruction

ADM has also been investigated for selected applications in extremity reconstruction.

One notable area is its use at radial forearm flap donor sites. In these cases, primary closure may not always be feasible, while the use of skin grafts can be associated with complications such as contracture, aesthetic changes, and donor-site morbidity.

Studies reviewed in the reference article have reported acceptable aesthetic outcomes and potential functional benefits when ADM is used beneath a skin graft. However, the authors emphasize that further research is needed for certain applications.

 Is Acellular Dermal Matrix Suitable for Every Patient?

No. Acellular dermal matrix is not a single product with identical applications for all patients.

ADM products may differ in several characteristics, including:

– Tissue origin
– Processing method
– Degree of cross-linking
– Thickness
– Flexibility
– Storage requirements
– Hydration characteristics
– Sterilization method
– Rate of integration with host tissue

These differences can affect how a product behaves after implantation and its suitability for a particular clinical application.

Therefore, ADM selection should be based on the type of procedure, implantation site, condition of the surrounding tissue, reconstructive objectives, and the surgeon’s experience.

 Limitations and Important Considerations Regarding Acellular Dermal Matrix

Despite promising findings, ADM has certain limitations.

For example, some studies have reported increased rates of complications such as seroma, infection, flap necrosis, or reconstructive failure in certain applications. Other studies, however, have found no significant differences between ADM-based approaches and techniques that do not use ADM.

Product cost, surgical technique, and the patient’s tissue condition are also important factors in clinical decision-making.

Consequently, acellular dermal matrix should not be considered a universal solution for every surgical procedure. Rather, it should be regarded as a biological reconstructive tool available to

surgeons, with its use determined by the specific clinical circumstances.

 Acellular Dermal Matrix from Iranian Tissue Product Company (Regen Allograft)

In Iran, products derived from human tissues and allografts are also manufactured for medical applications. Iranian Tissue Product Company (Regen Allograft) is a knowledge-based company active in the production and development of human allografts and bioimplants. The company began its operations in 2011 (1390 in the Iranian calendar), and its products are used across various medical fields.

One of the company’s products is the acellular dermal matrix membrane, also known as acellular skin.

According to the company’s official product information, this membrane is an allograft derived from human skin dermis. Its epidermal layer is removed while the basement membrane structure is preserved. The dermal portion contains a collagenous structure comprising type I and type III collagen fibers. Preserved reticular fibers and elastin contribute to the product’s flexibility.

According to the specifications provided by the company, the product is available in various thicknesses and dimensions, with certain sizes intended for applications in dentistry, oral and maxillofacial surgery, and ear, nose, and throat (ENT) surgery.

Another stated feature of the acellular dermal matrix membrane from Iranian Tissue Product Company is that it does not require refrigerated or frozen storage.

Selecting the appropriate size, thickness, and application requires reviewing the product’s instructions for use and technical specifications, as well as consulting the treating physician or surgeon.

 Why Is Understanding Product Characteristics Important?

As highlighted in the scientific reference article, not all ADM products are the same. Manufacturing processes and physical and chemical characteristics can influence matrix integration, durability, and behavior within the body.

Therefore, when selecting an acellular dermal matrix membrane, the designation “ADM” alone is not sufficient. Key factors to consider include the tissue source, processing method, thickness, dimensions, storage conditions, technical specifications, and intended application.

 The Future of Acellular Dermal Matrix in Regenerative Medicine

One of the most promising areas for future research is the use of ADM as a scaffold in tissue engineering and regenerative medicine.

Researchers are investigating whether acellular dermal matrices can serve as platforms for delivering substances such as growth factors or stem cells.

Some of these concepts remain at the early research or proof-of-concept stage. Nevertheless, preliminary findings have helped maintain interest in ADM as a subject of research in tissue engineering and tissue reconstruction.

 Conclusion

What is acellular dermal matrix? It is a cell-free biological matrix derived from the dermal structure that can serve as a scaffold to support tissue regeneration and integration with host tissue.

Research has investigated a wide range of ADM applications in plastic and reconstructive surgery, from head and neck and oral cavity reconstruction to breast surgery, abdominal wall reconstruction, and selected applications in the extremities.

However, the available scientific evidence indicates that ADM selection should be individualized. Factors such as product type, implantation site, surgical technique, and patient-specific conditions all influence clinical outcomes. The authors of the reference article also emphasize that further well-designed studies with longer follow-up periods are needed to establish the precise role of ADM in many of these applications.

 Acellular Dermal Matrix Membrane by Iranian Tissue Product Company (Regen Allograft)

For more information about the acellular dermal matrix membrane from Iranian Tissue Product Company, including its technical specifications, dimensions, thickness options, and stated applications, please visit the official product page.

 Primary Scientific Reference

Tork S, Jefferson RC, Janis JE. Acellular Dermal Matrices: Applications in Plastic Surgery. Seminars in Plastic Surgery. 2019;33:173–184. DOI: 10.1055/s-0039-1693019.