Immediate loading of two freestanding implants retaining a mandibular overdenture: 1-year pilot prospective study

Area of Science:

• Dental Implantology
• Prosthodontics
• Oral Surgery

Background:

• Mandibular overdentures offer improved function but require stable retention.
• Immediate loading protocols aim to reduce treatment time and enhance patient satisfaction.
• Freestanding implants in the mandible present unique biomechanical considerations.

Purpose of the Study:

• To evaluate the success rate of immediately loaded freestanding implants supporting mandibular overdentures.
• To assess peri-implant tissue response and complications over a 1-year period.
• To determine the feasibility of a two-implant solution for mandibular overdenture retention.

Main Methods:

• A 1-year prospective pilot study involving 10 adults (mean age 59.7 years).
• Placement of 20 titanium oxide-surface implants (3-mm machined collar) for mandibular overdentures opposing maxillary dentures.
• Clinical and radiographic evaluation of implant success, marginal bone levels, and complications.

Main Results:

• A cumulative implant success rate of 94% (16/17 implants) at 1 year.
• Mean marginal bone loss of 0.73 mm (adjusted for implant surface junction).
• Favorable osseointegration (Mean Periotest -4.25) and excellent soft tissue response (Modified Plaque Index 0-1) were observed.

Conclusions:

• Two immediately loaded unsplinted mandibular symphyseal implants provide favorable outcomes for overdenture retention.
• The protocol demonstrated high implant success and positive peri-implant tissue response.
• No irreversible surgical or prosthetic complications were noted in this pilot study.