Bone quality affects stability of orthodontic miniscrews

Wan-Ping Yu,Jui-Ting Hsu,Ming-Tzu Tsai,Heng-Li Huang,Jian-Hong Yu

doi:10.1038/s41598-022-06851-y

Wan-Ping Yu, Jui-Ting Hsu + Show 3 more

Open Access

https://doi.org/10.1038/s41598-022-06851-y

Copy DOI

Abstract

The objective of this study was to evaluate the effect of bone–miniscrew contact percentage (BMC%) and bone quality and quantity on orthodontic miniscrew stability and the maximum insertion torque value (ITV). Orthodontic miniscrews of five different dimensions and several bovine iliac bone specimens were used in the evaluation. Miniscrews of each dimension group were inserted into 20 positions in bovine iliac bone specimens. The experiment was divided into three parts: (1) Bone quality and quantity were evaluated using cone-beam computed tomography (CBCT) and microcomputed tomography. (2) The 3D BMC% was calculated. (3) The ITVs during miniscrew insertion were recorded to evaluate the stability of the orthodontic miniscrews. The results indicated that longer and thicker miniscrews enabled higher ITVs. CBCT was used to accurately measure cortical bone thickness (r = 0.939, P < 0.05) and to predict the bone volume fraction of cancellous bone (r = 0.752, P < 0.05). BMC% was significantly influenced by miniscrew length. The contribution of cortical bone thickness to the ITV is greater than that of cancellous bone structure, and the contribution of cortical bone thickness to BMC% is greater than that of cancellous bone structure. Finally, the higher is BMC%, the greater is the ITV. This study concludes that use of CBCT may predict the mechanical stability of orthodontic miniscrews.

Highlights

The objective of this study was to evaluate the effect of bone–miniscrew contact percentage (BMC%) and bone quality and quantity on orthodontic miniscrew stability and the maximum insertion torque value (ITV)
Most related studies that have used cone-beam computed tomography (CBCT) to evaluate orthodontic miniscrew stability have focused on the influence of cortical bone thickness at the insertion position on orthodontic miniscrew stability[21]; studies that have focused on cancellous bone density are relatively rare
No study has discussed the relationships between bone quality and quantity, BMC%, and orthodontic miniscrew stability

Summary

Introduction

The objective of this study was to evaluate the effect of bone–miniscrew contact percentage (BMC%) and bone quality and quantity on orthodontic miniscrew stability and the maximum insertion torque value (ITV). In clinical practice and research, many methods are available to evaluate orthodontic miniscrew stability; among these methods, the most widely used is maximum insertion torque value (ITV) measurement during insertion. The quality and quantity of jaw bones at the orthodontic miniscrew insertion position are often evaluated using two dimensional (2D) and three dimensional (3D) images. Most related studies that have used CBCT to evaluate orthodontic miniscrew stability have focused on the influence of cortical bone thickness at the insertion position on orthodontic miniscrew stability[21]; studies that have focused on cancellous bone density are relatively rare. Most studies have focused on dental implants[25,26,27]; studies that have explored the correlation between orthodontic miniscrew stability after insertion and the bone–miniscrew contact percentage (BMC%) are relatively r are[28,29]

Objectives

Methods

Results

Conclusion