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Updated: May 25, 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

Screw loosening with interchangeable abutments in internally connected implants after cyclic loading.

Seong Kyun Kim¹, Jai Young Koak, Seong Joo Heo

¹Department of Prosthodontics, Seoul National University, Seoul, Korea.

The International Journal of Oral & Maxillofacial Implants

|February 3, 2012

Summary

Using the same brand for dental implants and abutments is recommended. Different brands showed screw loosening and fractures after cyclic loading, unlike the Straumann solid abutment.

Related Experiment Videos

Last Updated: May 25, 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

Area of Science:

Dental Implantology
Biomaterials Science
Mechanical Engineering

Background:

Interchangeable abutments offer flexibility in dental restorations.
However, variations in material composition and manufacturing can affect mechanical stability.
Abutment screw loosening is a critical concern for long-term implant success.

Purpose of the Study:

To evaluate and compare the screw loosening of interchangeable abutments connected to internal connection implants.
To assess the mechanical integrity of different abutment systems under cyclic loading.

Main Methods:

Four groups of abutments (Straumann, Restore COC, Neoplant, AVANA) were tested with Straumann implants (n=7 each).
Abutments were tightened to 35 Ncm, subjected to 1 million cycles of 150 N at a 30-degree angle.
Periotest values (PTVs) and removal torque values (RTVs) were measured before and after loading.

Main Results:

The Straumann solid abutment and Restore COC abutment showed no mechanical failures.
Neoplant abutments experienced 86% screw fractures, and AVANA abutments had 57% implant fractures.
Straumann abutments exhibited significantly higher RTVs and lower final PTVs, indicating greater stability.

Conclusions:

Despite interchangeability, abutments from different manufacturers have varying physical and chemical properties.
Using implants and abutments from the same brand is recommended to prevent abutment screw loosening.
This ensures optimal mechanical interlocking and long-term stability of the restoration.