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Register a new userFrictional Forces of Self – Legating Brakets Versus Conventional Brackets During Sliding Techniques (A Laboratory Study)
مقارنة القوى الاحتكاكية بين الحاصرات ذاتية الربط و الحاصرات التقليدية في أثناء الانزلاق – دراسة مخبرية –
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يعد الربط بين الحاصرة و السلك التقويمي من العوامل المهمة المؤثرة في المقاومة الاحتكاكية الناشئة خلال الحركة الانزلاقية التي قد تعيق الحركة السنية التقويمية أو تؤخرها. هدف البحث: إلى مقارنة الاحتكاك المرافق لانزلاق نموذجين من الحاصرات أحدهما ذاتي الربط و الآخر ذو ربط تقليدي على أسلاك من الفولاذ اللاصدئ.
Ligating between brackets and orthodontic wire is considered one of the important factor affecting the frictional resistance during sliding movements. Aim of study: For these reasons this investigation aimed to compare the friction associating with sliding movement for two types of brackets : selfligating brackets and conventional brackets ; along stainless steel arch wires.
References used
Vaughan JL, Duncanson MG, Nanda RS. Relative Kinetic Fricitonal Forces Between Sintered Stainless Steel Brackets and Orthdontic Wires. Am J Orthod Dentofacial Orthop1995;107:20-27
Taylor NG, Keith I. Frictional resistance between orthodontic brackets and archwires in the buccal segments. Angle Orthod 1996;3:215-22
Ireland AJ, Sherriff M, McDonald F. Effect of bracket and wire composition on frictional forces. Eur J Orthod1991;13:322-28
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Since the solution of direct bonding of orthodontic brackets as an alternative to full encircling of the dental arch, researchers have begun conducting studies to evaluate the adhesion materials and different methods of enamel preparation to reach the most appropriate method for the requirements of ideal adhesion.
The laser has been used as an alternative effective method of etching enamel surface for direct bonding of orthodontic brackets instead of phosphoric acid. The aim of this study was to compare shear bond strength of orthodontic brackets following Er-
YAG versus Nd-YAG Laser etching. Eighty human extracted upper premolars were collected and divided randomly into two equal groups; the buccal enamel surface of the first group was etched by Er-YAG laser while the second group was etched by Nd-YAG laser. Each group was divided into two equal subgroups according to the bonding material type (chemical cure resin or light cure resin). The mechanical test has occurred by using a universal testing machine (Instron). The finding showed that no statistically significant differences in mean of shear bond strength between (Nd-YAG, Er-YAG) Laser etching group were found regardless of the bonding type.
This study compared the durability of a cast metal wedge restoration, a cast metal endocrown restoration, and a method of constructing a composite resin core without a root wedge when applying 45-degree inclined compressive forces using a mechanical testing device.
The purpose of this study was to evaluate the shear and tensile bond strengths of orthodontic
brackets bonded with self etching primer and resin-reinforced glass ionomer cement in comparison with
light cured resin adhesive.
The tested self-etching
primer and adhesive systems produced bond strength values higher than that of the light cured resin
adhesive whereas the resin-reinforced glass ionomer cement showed a significantly reduced bond strength
. Clinically, the use of self-etching primer and adhesive systems is suitable for orthodontic bracket
bonding.
The Objective is to determined whether enamel conditioning with sodium
hypochlorite (5,25%) and EDTA prior to etching was increased shear
bond strength of orthodontic brackets bonded with resin – modified glass
ionomer. our sample consisted of 42 extracted human premolars were
randomly divided into 3 groups.
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