Threaded versus porous-surfaced designs for implant stabilization in bone-endodontic implant model

Area of Science:

• Biomaterials Science
• Dental Implantology
• Orthopedic Research

Background:

• Endodontic implant stability is crucial for successful osseointegration.
• Conventional implant designs (threaded, smooth-tapered) face challenges in achieving long-term fixation, especially under immediate function.
• Novel implant surface modifications are needed to enhance bone-to-implant contact and stability.

Purpose of the Study:

• To compare the bone stabilization effects of porous-surfaced endodontic implants versus conventional threaded and smooth-tapered designs.
• To evaluate the impact of immediate functional loading on implant fixation.
• To elucidate the mechanisms of implant fixation and failure through histological and SEM analysis.

Main Methods:

• Utilized an endodontic implant model system in a canine mandible.
• Compared porous-surfaced, threaded, and smooth-tapered implant designs (n=83).
• Assessed implant stability via clinical, radiographic, pull-out tests, SEM, and histology at immediate, 3, 6, and 12 months post-implantation.

Main Results:

• Porous-surfaced implants exhibited increasing shear strength over time due to bone ingrowth.
• Threaded implants showed a gradual loss of fixation, attributed to fibrous tissue encapsulation.
• Smooth implants demonstrated continuous low shear strength with persistent fibrous encapsulation.

Conclusions:

• Porous-surfaced endodontic implants achieve robust fixation through bone ingrowth, outperforming threaded and smooth designs.
• Immediate functional loading is better tolerated by porous-surfaced implants due to enhanced osseointegration.
• Porous-surfaced implants present a more favorable long-term prognosis for endodontic applications requiring immediate function.