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An Improved Mechanical Testing Method to Assess Bone-implant Anchorage

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Published on: February 10, 2014

Marginal Bone Loss Around Bone-Level Fully Guided Implants With Direct Implant Connection Versus Intermediate

Jordi Gargallo-Albiol^1,2, María José Zilleruelo-Pozo¹, Anna Treserra-Parra¹

¹Department of Oral and Maxillofacial Surgery, Universitat Internacional de Catalunya, Barcelona, Spain.

Clinical Oral Implants Research

|June 2, 2026

Summary

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Using an intermediate abutment for posterior implant-supported restorations significantly reduced marginal bone loss (MBL) compared to direct implant connections. This finding highlights the benefit of intermediate abutments in preserving peri-implant bone health.

Area of Science:

Dentistry
Oral Implantology
Prosthodontics

Background:

Partial edentulism necessitates implant-supported restorations.
Bone-level tapered implants are utilized for posterior restorations.
The use of intermediate abutments is being investigated for peri-implant health.

Purpose of the Study:

To evaluate the impact of intermediate prosthetic abutments on peri-implant marginal bone loss (MBL).
To compare MBL in posterior implant-supported fixed restorations with and without intermediate abutments.

Main Methods:

A randomized clinical trial involving 30 patients (60 implants) with partial edentulism.
Implants were bone-level tapered, placed via a guided approach, and restored with full zirconia.
Patients were divided into a Control group (direct connection) and a Test group (intermediate abutment).

Keywords:

computer‐assisted surgery dental implants dental implant‐abutment design implant‐supported dental prosthesis

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Last Updated: Jun 3, 2026

An Improved Mechanical Testing Method to Assess Bone-implant Anchorage

An Improved Mechanical Testing Method to Assess Bone-implant Anchorage

Published on: February 10, 2014

Marginal bone loss was measured via periapical radiography over 24 months.

Main Results:

The Test group (intermediate abutment) exhibited significantly lower MBL (0.83 ± 0.25 mm) than the Control group (1.17 ± 0.35 mm; p=0.001).
No significant difference in MBL was found between intermediate abutment height subgroups (1 mm vs. 2.5 mm).
A trend towards more favorable outcomes was observed with the higher intermediate abutment.

Conclusions:

Intermediate abutments significantly reduce marginal bone loss in posterior implant-supported fixed restorations compared to direct implant connections.
The use of intermediate abutments is a beneficial strategy for preserving peri-implant bone.
Further research may explore optimal intermediate abutment heights.