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Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie

Published in:

01-05-2018 | Original Article

Influence of geometric design characteristics on primary stability of orthodontic miniscrews

Authors: Eman Saad Radwan, Dr. Mona A Montasser, Ahmed Maher

Published in: Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie | Issue 3/2018

Abstract

Objective

Aim of the present study was to investigate the influence of geometric design characteristics on primary stability of orthodontic miniscrews.

Materials and methods

Forty self-drilling miniscrews with different geometric design characteristics were divided into the following groups (n = 10): group I—Tomas® (Dentaurum, Germany), group II—AbsoAnchor® (Dentos, Korea), group III—HUBIT® miniscrew (HUBIT, Korea), group IV—Creative® (China). The four types were conical miniscrews with 1.6 mm diameter and 6.0 mm length. The miniscrews were manually inserted perpendicular to cow ribs until the full thread length was reached with the help of a 1.3 mm predrilled pilot hole. Each miniscrew was evaluated using scanning electron microscope. Linear and angular measurements were taken using Photoshop CS3 software. Miniscrew stability was measured by the Periotest® and pullout test.

Results

All linear and angular measurements of the geometric characteristics showed significant differences between the four groups (p ≤ 0.001). Results of the pullout test showed significant differences between the four groups (p ≤ 0.001), while the Periotest® values showed no significant differences (p = 0.122). A multiple linear regression analysis revealed the significant predictors for higher pullout: a larger flank, a higher value for the thread angle, lead angle, and apical face angle (p ≤ 0.001).

Conclusions

Orthodontic miniscrews’ geometric design characteristics significantly affected the primary stability. Larger pitch width, flank, thread angle, apical face angle, and/or lead angle led to higher primary stability. Smaller a thread shape factor (TSF) also improved primary stability. Varying these characteristics may enhance miniscrew design.

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Title: Influence of geometric design characteristics on primary stability of orthodontic miniscrews
Authors: Eman Saad Radwan
Dr. Mona A Montasser
Ahmed Maher
Publication date: 01-05-2018
Publisher: Springer Medizin
Published in: Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie / Issue 3/2018
Print ISSN: 1434-5293
Electronic ISSN: 1615-6714
DOI: https://doi.org/10.1007/s00056-018-0131-7

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Springer Medicine

Influence of geometric design characteristics on primary stability of orthodontic miniscrews

Abstract

Objective

Materials and methods

Results

Conclusions

Keynote webinar | Spotlight on sleep in brain health

Springer Medicine

Abstract

Objective

Materials and methods

Results

Conclusions

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