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.
Zusammenfassung
Ziel
In der vorliegenden Studie wurde der Einfluss geometrischer Merkmale auf die Primärstabilität von kieferorthopädischen Minischrauben untersucht.
Material und Methoden
Vierzig selbstbohrende Minischrauben mit unterschiedlichem geometrischen Design von 4 Herstellern wurden in Gruppen (n = 10) eingeteilt: Gruppe I: Tomas® (Dentaurum, Germany), Gruppe II: AbsoAnchor® (Dentos, Korea), Gruppe III: HUBIT® (HUBIT, Korea) und Gruppe IV: Creative® (China). Bei den vier Typen handelte es sich um konische Minischrauben von 1,6 mm Durchmesser und 6 mm Länge. Nach Setzen der Pilotbohrung (Durchmesser: 1,3 mm) wurden die Minischrauben manuell senkrecht in bovine Rippen vollständig inseriert. Jede Schraube wurde elektronenmikroskopisch untersucht und unter Verwendung der Software Photoshop CS3 vermessen. Die Primärstabilität wurde mittels Periotest® und Pullout-Test überprüft.
Ergebnisse
Zwischen den 4 Gruppen zeigten sich bezüglich aller geometrischen Merkmale statistisch signifikante Unterschiede (p ≤ 0,001). Statistisch signifikante Unterschiede zeigten sich ebenfalls für die Ergebnisse des Pullout-Tests (p ≤ 0,001), jedoch nicht für die Periotest® Werte (p = 0,122). Die multiple lineare Regressionsanalyse ergab als wesentliche Prädiktoren für erhöhte Pullout-Werte: vergrößerte(r) Flanke/Flankensteigung, Gewindesteigung und Scheitelwinkel (p ≤ 0,001).
Schlussfolgerungen
Bestimmte Merkmale des Schraubendesigns beeinflussten die Primärstabilität kieferorthopädischer Minischrauben signifikant. Vergrößerte(r) Gewindeschneidenabstand, Flanke/Flankensteigung, Gewindesteigung und Scheitelwinkel bedingten eine höhere Primärstabilität. Auch ein verkleinerter Gewindefaktor (TSF) verbesserte die Primärstabilität. Durch Variieren dieser Merkmale lässt sich das Minischraubendesign weiter optimieren.
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E.S. Radwan, M.A. Montasser and A. Maher declare that they have no competing interests.
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Radwan, E.S., Montasser, M.A. & Maher, A. Influence of geometric design characteristics on primary stability of orthodontic miniscrews. J Orofac Orthop 79, 191–203 (2018). https://doi.org/10.1007/s00056-018-0131-7
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DOI: https://doi.org/10.1007/s00056-018-0131-7