ORTODONTİK MİNİ VİDALARIN YERLEŞTİRME ANGULASYONUNUN VE GÖVDE YAPISININ PRİMER STABİLİTEYE ETKİSİ

Abstract

Çalışmanın amacı 30°, 45°, 60° ve 90° de yerleştirilmiş, aynı markanın farklı gövde yapısına sahip mini vidalarının maksimum yerleştirme torkunu, pull-out ve shear kuvvet dayanımını ölçmek ve stabilitelerini karşılaştırmaktır. Çalışmada 1.4×8 mm ebatlarında toplamda 144 tane titanyumalaşım, self-drilling mini vida (Abso-Anchor konik, Abso-Anchor silindirik) kullanılmıştır. Her iki grup dört farklı açıda yerleştirilmiş ve maksimum yerleştirme torkları kaydedilmiştir. Daha sonra vidalara pull-out ve shear kuvvet testleri, vida başı 1.5 mm yer değiştirinceye kadar uygulanmış ve gösterdikleri kuvvet dayanımları Ncm cinsinden kaydedilmiştir. Veriler IBM SPSS programıyla analiz edilmiştir. İstatistiksel analizler; Shapiro-Wilk, tek yönlü Anova, Tukey HDS ve Student t testleriyle yapılmıştır. En fazla maksimum yerleştirme tork değeri ve kuvvet dayanımı, konik gövde yapısı ve 45° yerleştirme açısında görülmüştür. Abso-Anchor konik grubu primer stabilite yönünden diğer gruptan daha başarılı bulunmuştur. En yüksek primer stabilite için konik gövde yapısı tavsiye edilmektedir. 45° yerleştirme açısı, aşırı eğimli veya dik açılara göre daha uygundur.

Keywords

• Mini vida
• primer stabilite
• pull-out test
• shear test

EFFECTS OF INSERTION ANGLE AND BODY SHAPE ON THE PRIMARY STABILITY OF ORTHODONTIC MINISCREWS*

Abstract

In this study, we aimed to analyze the maximum insertion torque, pull-out and shear strength of the samebrand mini screws with different body structures that were inserted at 30°,45°,60°and, 90° in order to compare their stability. The study consisted of 144 self-drilling, 1.4×8 mm titanium alloy minis crews (Abso-Anchor conical, Abso-Anchor cylindrical). Each group of mini screws were inserted in fresh male bovine hip bone segments at four different angles and the maximum insertion torque was recorded. Pull-out and shear force resistance values were measured and recorded until 1.5 mm displacement occurred. The data was analyzed with the use of the IBM SPSS program. Statistical analyses were conducted with Shapiro-Wilk, One-Way ANOVA, Tukey HSD and Student's t-test. It was determined that the maximum insertion torque and force resistance values of the conical mini screws and an insertion angle of 45° were significantly higher than those of the other groups. The Abso-Anchor conical group was the most resistant to failure. To achieve the best primary stability, the use of aconical shape is advisable. The insertion angle of 45° is more favorable than excessive oblique or vertical angles.

Keywords

• Mini screw
• primary stability
• pull-out test
• shear test

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