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J Pharm Bioallied Sci. 2014 Jul;6(Suppl 1):S150-5. doi: 10.4103/0975-7406.137429.

Comparison of the frictional resistance between archwire and different bracket system: An in vitro study.

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1
Department of Orthodontics and Dentofacial Orthopaedics, Azeezia College of Dental Sciences and Research, Kollam, Kerala, India.

Abstract

BACKGROUND AND OBJECTIVES:

The purpose of this study is to evaluate the frictional resistance generated by conventional stainless steel, radiance ceramic bracket, self-ligating and composite brackets using a 0.019 × 0.025 stainless steel straight length wires in a 022 slot and to select brackets based on their frictional characteristic.

METHODOLOGY:

In order to conduct this study, four different types of bracket system were selected of the mclaughlin-bennet-trevesi (MBT) discipline. They are Group 1 - stainless steel, Group 2 - composite bracket Group 3 - (American Orthodontics) radiance ceramic bracket Group 4 - self-ligating bracket (SLB) (Empower). In this study, five maxillary brackets of an arch of each type were used. All brackets are 0.022 × 0.028 in preadjusted edgewise appliance which simulates the dental arch. Five brackets were bonded to a stainless steel bar of dimension 150 mm × 25 mm × 3 mm. The bracket-arch wire units were submitted to mechanical test with an Instron universal testing machine 3365. A testing apparatus or holding jig was designed to hold the bracket during the mechanical test. Each sample was pulled at a speed of 6 mm for 1 min. Descriptive statistical information including mean and standard deviation of maximum friction force was calculated for each bracket wire combination.

INTERPRETATION AND CONCLUSION:

The SLB has the least friction among the four groups. The ceramic bracket showed the highest friction followed by stainless steel bracket, composite bracket, and SLB.

KEYWORDS:

Instron; orthodontic brackets; stainless steel arch wire

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