Effects of platform switching on crestal bone around implants: a histomorphometric study in monkeys

Area of Science:

• Dental Implantology
• Biomaterials Science
• Periodontology

Background:

• Peri-implant bone loss is a common complication following dental implant placement.
• Platform-switched implant-to-abutment connections have been proposed to mitigate bone resorption.
• Previous human studies suggest benefits, but direct comparative evidence in a controlled setting is valuable.

Purpose of the Study:

• To histomorphometrically compare alveolar bone levels around platform-switched and non-platform-switched implant connections.
• To evaluate the effect of connection type on vertical and horizontal bone resorption in vivo.
• To provide objective data on the bone maintenance capabilities of platform-switched connections.

Main Methods:

• Adjacent pairs of platform-switched and non-platform-switched implants were placed in a one-stage surgery in three cynomolgus monkeys.
• Abutment connection was performed eight weeks post-surgery.
• Histomorphometric analysis was conducted to assess bone resorption and formation.

Main Results:

• Significant vertical and horizontal alveolar bone resorption occurred around non-platform-switched implants.
• Vertical bone levels were maintained around platform-switched implants.
• New horizontal bone formation was observed around platform-switched implants.

Conclusions:

• Platform-switched implant-to-abutment connections effectively prevent peri-implant bone loss.
• These connections promote bone maintenance and new bone formation, unlike non-platform-switched designs.
• The findings support the clinical use of platform-switched connections for long-term dental implant success.