External Hex Dental Implants

The External Hex interface is the most established connection system on the market, and the preferred choice for many training institutions and top-end users. Many clinicians worldwide continue to prefer the External Hex for its ease of use, widespread availability, long history of clinical success, and from mere personal preference.

It is also known to be more “forgiving” in situations of impassive fit or implant divergence. Southern Implants has therefore continued to refine its External Hex range, to provide its loyal supporters with exceptional reliability alongside proven modern features.

External Hex Connection
– MAX Implants
External Hex – Co-Axis® Implants
External Hex – Straight IBT

Macrodesign has been carefully optimized through body shapes, thread profile, cutting flutes, and a wide range of diameters and lengths. All implants feature the Southern Implants moderately rough Alumina blasted-surface (with over 15 years of proven clinical success), and selected sizes are available with the Machined Surface Coronal (MSc) hybrid roughness, indicated for patients at high risk of thread exposure or infection.

A smoother collar of specific roughness provides proven resistance against peri-implantitis, and many platform-switch options are available. For those desiring the best of both worlds, Southern Implants also offers an external hex-internal drive option.

The connection geometry makes many variations of implant body possible, including Co-Axis™ and MAX options, as well as standard-diameter and -length implants with cylindrical or tapered bodies.

The external hex connection is also used on specialized osseointegrating fixtures such as the ultra-short, zygomatic and oncology implants, making this the most versatile interface type on the market.


Surgical and Prosthetic Benefits
  • Classic, trusted connection with sought-after modern features
  • Forgiving interface
  • Good all-round stability with any prosthetic design
  • Widest range of prosthetic options for treatment of single tooth, partial or full edentulism
  • Expansive range of body shapes, lengths, diameters, platform angulations and specialized designs
  • Widespread use and availability
Technical Facts
  • Standard implants available in 3.0mm, 3.25mm, 3.75mm, 4.0mm, 5.0mm and 6.0mm diameters, lengths 6-18mm, tapered or cylindrical body shapes. (not all diameters or designs available in all lengths)
  • Co-Axis™ implants available in 3.5mm, 4.0mm, 5.0mm and 6.00mm diameters, lengths 8.5-24mm, platform angulations of 12°, 24° and 36°
  • MAX implants available in 6.0mm, 7.0mm, 8.0mm and 9.0mm diameters, lengths 7,9 and 11mm
  • Moderately rough surface with 15 years of clinical evidence
  • Also available with Machined Surface Coronal (MSc) hybrid surface for easier coronal debridement


Van Staden RC, Guan H, Loo Y, Johnson NW, Nel M. Comparative analysis of internal and external-hex crown connection systems – a finite element study. J. Biomedical Science and Engineering, 2008, 1, 10-14.

Ribeiro CG, Maia MLC, Scherrer SS, Cardoso AC, Wiskott HWA. Resistance of three implant-abutment interfaces to fatigue testing. J Appl Oral Sci. 2010, 413-420.

Zembic A, Kim S, Zwahlen M, Kelly JR. Systematic Review of the Survival Rate and Incidence of Biologic, Technical, and Esthetic Complications of Single Implant Abutments Supporting Fixed Prostheses. Int J Oral Maxillofac Implants 2014;29(SUPPL):99-116. doi: 10.11607/jomi.2014suppl.g2.2.

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