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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

Multiscale analyses of the bone-implant interface.

J Y Cha¹, M D Pereira², A A Smith²

¹Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford School of Medicine, Stanford, CA, USA Orthodontic Department, College of Dentistry, Yonsei University, Seoul, South Korea.

Journal of Dental Research

|January 29, 2015

Summary

This summary is machine-generated.

High insertion torque (IT) in dental implants increases peri-implant bone damage, including cell death and micro-fractures. Avoiding high IT is crucial for preserving bone viability and health around implants.

Keywords:

biological process dental implantation finite element analysis orthodontic anchorage techniques osseointegration prosthesis implantation

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Area of Science:

Biomaterials Science
Orthopedic Research
Dental Implantology

Background:

High insertion torque (IT) is often used for dental implants to achieve primary stability and enable early loading.
However, the potential negative effects of high IT on peri-implant bone health are not fully understood.

Purpose of the Study:

To investigate the response of peri-implant bone to strains and stresses induced by low versus high insertion torque (IT).

Main Methods:

Titanium micro-implants were placed in murine femurs using scaled low and high IT values.
Finite element modeling calculated strain distribution and magnitude.
Stiffness tests assessed implant stability.
Molecular, cellular, and histomorphometric analyses quantified effects on apoptosis, mineralization, resorption, and collagen deposition.

Main Results:

High IT significantly increased the zone of dead and dying osteocytes in peri-implant bone compared to low IT.
High IT led to micro-fractures, increased bone resorption, and decreased bone formation.
Low IT did not significantly enlarge the osteocyte death zone caused by osteotomy preparation.

Conclusions:

High insertion torque creates excessive interfacial stress and strain, damaging peri-implant bone.
High IT should be avoided to preserve peri-implant bone viability and minimize adverse effects like resorption and micro-fractures.