The Science Behind SMMS: Why 4-Ply Wraps Make Double Wrapping Obsolete

When it comes to infection control in dental settings, the science behind your sterilization materials matters. One of the most advanced and trusted materials in the field is SMMS, short for Spunbond-Meltblown-Meltblown-Spunbond. This multi-layered nonwoven fabric plays a critical role in keeping sterilized instruments safe until use.

So, what exactly is SMMS, and why does it outperform traditional single-ply wraps?

SMMS: A Four-Layer Engineered Barrier

SMMS is a composite structure made of:

• Two outer spunbond layers
• Two inner meltblown layers

Each layer serves a distinct and essential purpose:

1. Spunbond Layers (Outer Layers)
   • These are strong, durable, and abrasion resistant.
   • Made of long polypropylene fibers that are thermally bonded.
   • They provide mechanical strength, allowing the wrap to resist tearing, punctures, and handling during sterilization, transport, and storage.
2. Meltblown Layers (Inner Layers)
   • These are ultra-fine, randomly laid microfibers.
   • Their fine pore structure creates a dense web, which acts as a microbial barrier.
   • They trap particles and microorganisms, offering filtration efficiency similar to that used in surgical masks and N95 respirators.

Why SMMS Replaces Double Wrapping

Traditional single-ply wraps require double wrapping, either:

• Sequentially: One wrap, then another after turning the cassette.
• Simultaneously: Two wraps stacked and folded together.

This is to ensure that if the outer wrap is compromised, the inner wrap maintains sterility. However, SMMS wrap, with its built-in 4-ply structure, eliminates this need entirely.

Instead of two separate layers, SMMS integrates four into one, achieving:

• Superior bacterial filtration efficiency (BFE)
• Resistance to tears and moisture
• Proven barrier performance under pressure and in storage

SMMS paper is tested and validated to meet sterilization packaging system standards such as:

• ASTM F88/F88M (Seal Strength)
• ASTM F1608 (Microbial Barrier)
• ISO 11607-1 (Packaging for Terminally Sterilized Medical Devices)

Bottom Line for Dental Professionals

Using maxill’s 4-ply SMMS wrap means:

• Less wrapping, same protection
• Streamlined instrument reprocessing
• Reduced waste and costs
• Compliance with best practices and industry standards

It’s a smart, science-backed choice that supports safety without compromising efficiency.

Michelle Aubé (Simmonds) RDH, maxill Dental Hygiene Educator

Michelle is a Dental Hygiene Speaker, Consultant and Educator with over 30 years of experience as a RDH and 4 years as a CDA. She is a professor and curriculum writer at Fanshawe College in both the dental hygiene and continuing education program sharing her knowledge in IPAC, professional practice, periodontal classification, social justice, advocacy and clinical applications. She is maxill's CE and IPAC Director and wears various IPAC hats including auditing federal correctional facilities dental clinics for IPAC standards. Michelle is ODHA's Regional Board Director and authors articles for CDHA's OH Canada professional publication and continues to practice clinically in London ON. She is a CDHO IPAC Remedial Facilitator and IPAC Expert Opinion. Her strong ethics has allowed her to serve on the Discipline Committee at Algonquin College and hold the position of a CDHO Quality Assurance Assessor for 7 years. As a lifelong learner she is completing a BA in Adult Education at Brock University. Her diverse dental background and current status as a practicing RDH offer a fulsome and realistic view of dental-related topics. As a passionate champion for the profession, she advocates for equity, professional autonomy, and systemic change, true grassroots leadership at its finest.

Michelle can be reached at [email protected]