Suture Materials and Their Role in Oral Wound Healing - An Overview

Why Is the Suture Material Important in Maxillofacial Surgery?

• The primary goal of an oral and maxillofacial surgeon or dentist during post-operative suturing is to reapproximate the edges of oral wounds with minimal tension, ensuring effective blood control or hemostasis. Achieving proper hemostasis not only stabilizes the wound but also promotes faster healing. The choice of suturing material depends on whether the unattached mucosa or the attached mucosa, accompanied by keratinized tissue, needs to be sutured.

• Additional challenges dental and maxillofacial surgeons face include preventing bacterial colonization and minimizing tension caused by the tongue, swallowing, or masticatory actions. These factors are crucial for ensuring that oral wound healing is both rapid and effective. In this article, we will explore the different stages of oral wound healing, along with the various suture materials and needles commonly used by oral and maxillofacial surgeons or dentists, all aimed at achieving effective surgical wound closure within the oral cavity.

What Are the Key Phases of Oral Wound Healing?

Initiation of Oral Wound Healing in Phases:

Wound healing in dentistry is a multifaceted and sequential process that begins immediately after suturing. It involves four key phases:

1. Hemostatic Phase: This initial phase occurs within minutes of suturing. Exposed collagen at the wound site triggers hemostasis by constricting local blood vessels and forming a platelet plug. Platelets then degrade, releasing cytokines and growth factors that lead to the formation of a fibrin clot.

2. Inflammatory Phase: Lasting approximately 72 hours, this phase is marked by heat, swelling, redness, and local pain. Increased vascularity results in the accumulation of macrophages, leukocytes, growth factors, and enzymes, which are essential for effective wound closure.

3. Proliferative Phase: Spanning from several days to weeks, this phase sees the replacement of the fibrin clot with granulation tissue. This tissue is rich in collagen, elastin, hyaluronic acid, and immature type III collagen.

4. Maturation (Remodeling) Phase: The final phase involves the replacement of the extracellular matrix and type III collagen with more organized type I collagen. This phase can last from months to years, depending on the wound’s complexity and the patient’s healing response.

What Are the Different Suture Materials Used in Dentistry?

Let us explore the different suture materials used in dentistry and how they contribute to wound healing phases. a dentist or oral surgeon will select the most appropriate material based on the situation and the tensile strength required. The choice also depends on the extent of the wound and how well the suture material can distribute tension forces across the wound.

Resorbable Suture Materials: These are commonly used in modern dentoalveolar surgery and are often the preferred choice. Resorbable sutures do not need to be removed later, reducing patient anxiety and eliminating the need for additional visits. Examples include:

1. Natural Gut and Chromic Gut Sutures: Natural gut sutures are derived from animal intestines and are treated with chromium salts to extend their absorption time to about seven to ten days. They maintain tensile strength for up to five days. However, they may dissolve faster in conditions like GERD (gastroesophageal reflux disease), antipsychotic drug therapy, or Sjogren’s Syndrome, potentially leading to wound complications.

2. Synthetic Resorbable Sutures: Common examples include polyglycolic acid (PGA) and polydioxanone. PGA is widely used in dentistry and is absorbed through hydrolysis over 21 to 28 days. It maintains high tensile strength for about three weeks, making it suitable for counteracting masticatory forces. Polydioxanone sutures, which are monofilaments, retain about 70 percent of their tensile strength for 14 to 15 days.

Non-Resorbable Sutures: Non-resorbable sutures, such as silk and polyester, are used for their durability and strength. Silk sutures provide effective tension maintenance but have a higher risk of infection due to their braided structure. Polyester sutures, including materials like polypropylene, offer enhanced durability and a lower risk of infection due to their smooth, non-braided surface.

1. Silk Sutures: Silk sutures are a cost-effective and readily available option commonly used in various surgical procedures. Their braided structure provides effective tension maintenance and allows for secure knotting, which is beneficial in ensuring that the sutures remain in place during the healing process. However, silk sutures have some notable drawbacks. The braided nature of silk can increase the risk of bacterial accumulation, as the surface area of the braided threads can harbor bacteria. This makes silk sutures less ideal for procedures involving implantation or dental grafts, where a lower risk of infection is crucial. The potential for bacterial growth may lead to complications and affect the overall success of the surgical outcome.

2. Polyester Sutures: Polyester sutures, including materials such as polypropylene, black monofilament, and polytetrafluoroethylene, are frequently used in dental and maxillofacial surgeries. These sutures are preferred over silk sutures for several reasons. Polyester sutures offer superior durability and strength, which helps maintain wound closure effectively. They also have a reduced risk of infection compared to silk sutures, as their non-braided, smooth surface is less likely to harbor bacteria. The enhanced performance and safety profile of polyester sutures make them a popular choice in situations where long-term wound support and minimal infection risk are critical.

Understanding the characteristics and applications of these non-resorbable suture materials is essential for ensuring effective wound closure and achieving optimal healing outcomes in dental and maxillofacial surgeries. Selecting the appropriate suture material based on the specific needs of the procedure and patient can significantly impact the success of the surgical intervention and the overall recovery process.

Conclusion

The primary focus of a dentist or oral surgeon during the postoperative period—whether following the resection of a lesion or a routine procedure such as the extraction of a third molar (wisdom tooth)—is to ensure the best possible outcome in the dental surgical setting. This goal encompasses achieving effective wound closure and stabilizing the re-approximated edges of the oral or surgical wound. Proper wound closure is essential for facilitating optimal healing and minimizing complications. Selecting the appropriate suture material is a critical aspect of this process. The choice of suture material depends on various factors, including the type and location of the surgical procedure, the characteristics of the wound, and the specific needs of the patient. For instance, the material must be suitable for maintaining the necessary tensile strength to support the wound while it heals, as well as for preventing infection and promoting effective tissue recovery. By carefully choosing the most suitable suture material based on these considerations, oral surgeons can enhance the healing process and achieve the best possible results for their patients.