Suture Materials in Dentistry
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Direct answer
Sutures hold wound edges together long enough for biology to take over, and every material is a timed device: plain gut loses strength within about a week and is gone by two to three months; chromic gut holds longer; polyglactin 910 keeps roughly 75 per cent of its tensile strength at two weeks and is absorbed by hydrolysis in 56-70 days; polydioxanone supports tissue the longest among absorbables; silk, nylon and polypropylene persist. Oral surgery favours absorbable braided and monofilament materials on mucosa and nonabsorbable monofilaments on facial skin. Monofilaments resist bacterial adhesion better in the contaminated mouth, while braided silk handles beautifully but wicks fluid along its capillarity. Needles are half or three-eighths circle, cutting or reverse-cutting, swaged atraumatically, in the 3-0 to 5-0 sizes typical of dental practice, with intraoral sutures removed at five to seven days.
What you must remember
- Classification axes: absorbable versus nonabsorbable; natural versus synthetic; braided (multifilament) versus monofilament; the three-way table every short note begins with.
- Absorbable timelines: plain gut loses strength in roughly the first week and absorbs by enzymolysis in about two to three months; chromic gut (chromium salt-treated collagen) holds longer early on and absorbs around 90 days; polyglactin 910 (Vicryl — a 90:10 glycolide-lactide copolymer) retains about 75 per cent strength at two weeks and is absorbed hydrolytically in 56-70 days.
- Long-support absorbable: polydioxanone, a slow monofilament maintaining useful strength for weeks and absorbing over months — for slow-healing sites.
- Nonabsorbable workhorses: silk (braided, superb handling and knot security, encapsulated in tissue rather than absorbed); nylon and polypropylene (monofilaments, inert, high memory, weak knot security needing extra throws).
- Braided versus monofilament: braided handles well and knots firmly but shows capillarity and bacterial retention — a disadvantage in the orally contaminated field; monofilament glides through tissue with less infection risk.
- Needle anatomy: swaged (atraumatic) needles; three-eighths circle for most intraoral work, half circle in restricted spaces; cutting and reverse-cutting edges for skin and mucosa — the reverse cutting edge reduces tissue cut-out under tension.
- Sizes and removal: 3-0 to 4-0 on oral mucosa, 5-0 or 6-0 monofilament for facial skin; intraoral sutures out at five to seven days, facial skin about the fourth to sixth day to limit tract marks.
- Paediatric and uncooperative patients: absorbable mucosal sutures avoid a second appointment under stress — a standard Indian oral surgery convention.
Closing three different wounds
A punch biopsy of the buccal mucosa, a tongue laceration and a facial laceration choose three different threads, and the reasoning is the exam answer. The mucosal biopsy site sits in saliva with excellent vascularity; 4-0 silk or polyglactin interrupted sutures hold the edges for five days, and in a cooperative adult either serves — silk for handling, polyglactin when the patient cannot return. The tongue adds movement and depth: a 3-0 braided absorbable in deep bites closes the muscle, with monofilament on the surface so the knot does not irritate. Facial skin is the cosmetic case: 5-0 or 6-0 monofilament nylon in fine, everting bites, removed around the fifth day before tract marks form, with support passing to sterile tapes.
The material science threads through each decision. In the mouth, bacterial colonisation of braided material is a real cost, so monofilament polyglecaprone or polyglactin appeals where smooth passage matters; knot security meanwhile demands two more throws on any monofilament than on silk. Enzymatic digestion of gut provokes more tissue reaction than the hydrolysis of synthetic polymers — why synthetics displaced gut in Indian teaching centres, and why chromic gut, its collagen treated with chromium salts to resist enzymes, survives only where its slower clock is wanted.
Suture questions in university papers
The classic short note is "classify sutures with examples", and the marking scheme wants all three axes plus one example each — gut and polyglactin versus silk, nylon and polypropylene. The number set examiners recycle: polyglactin 75 per cent strength at two weeks and 56-70 day absorption, chromic gut around 90 days, intraoral removal at five to seven days. MCQ traps: silk is classified nonabsorbable even though it eventually loses tensile integrity over years; Vicryl is a copolymer of glycolide and lactide; the reverse-cutting needle exists to prevent cut-out.
Frequently asked questions
Which absorbable suture retains about 75 per cent strength at two weeks?
Polyglactin 910 (Vicryl), a braided glycolide-lactide copolymer absorbed hydrolytically over 56-70 days.
How do plain and chromic gut differ?
Chromic gut is collagen treated with chromium salts, resisting enzymolysis so it holds strength longer early on and absorbs around 90 days, against plain gut's faster loss of strength within about a week.
Why are monofilament sutures preferred in contaminated oral wounds?
Their smooth surface lacks the interstices of braided material, so bacteria adhere and wick far less, lowering wound infection risk.
When are intraoral and facial sutures removed?
Intraoral sutures at five to seven days; facial skin sutures around the fourth to sixth day to minimise tract marks, with support continued by tapes.
What advantage does a reverse-cutting needle offer?
Its flat edge lies on the wound side, so tension is borne away from the incision line, reducing the cut-out that a conventional cutting needle causes in taut mucosa or skin.