Award Date


Degree Type


Degree Name

Master of Science in Oral Biology

First Committee Member

Brendan O’Toole, Chair

Second Committee Member

James Mah

Third Committee Member

Bob Martin

Graduate Faculty Representative

Mohamed Trabia

Number of Pages



Fixed orthodontic appliances (braces) are one of the most widely used appliances to correct malocclusion, however many patients prefer less metal display. To meet this demand more esthetically pleasing brackets and archwires have been developed. These esthetic components are often clear, white or tooth colored. Coatings of various types are commonly used to produce an esthetic archwire. However, these coating materials tend to wear and degrade, which may cause binding and increased resistance to friction, thereby potentially reducing the efficiency of tooth movement. Therefore, in vitro testing of tooth brush abrasion on frictional resistance of various aesthetic archwires was tested. Methods . Frictional resistance of epoxy, palladium and polymer coated archwires were tested relative to uncoated archwires (controls). Nickel titanium archwires of size (0.016-in, 0.018-in, 0.017 × 0.025-in, 0.019 × 0.025-in) with these coatings were tested. Testing was also performed on stainless steel archwire sizes (0.018-in, 0.017 × 0.025-in, and 0.019 ×0.025-in) with epoxy and polymer coatings. Epoxy and polymer coated archwires as well as the uncoated archwires were provided by G&H Wire, Greenwood, IN., while palladium coated archwires were provided by Jin Sung Co., Gyeonggi-Do, Korea. Standard edgewise twin brackets (MBT) 0.022 × 0.028-in (American Orthodontics, Sheboygan, WI) were used to test each wire. Frictional resistance was tested using a United testing machine (United Calibration Corp., Huntington beach, CA) with a speed of 0.5 inches per minute, and testing period of two minutes. A 25 lb. load cell (Transducer Techniques, Temecula, CA) was mounted on the United testing machine. Kinetic frictional resistance values were recorded over a marked 0.5 inch span on each sample. Results . With the exception of one of the coated NiTi wires (epoxy 0.016-in), all coated NiTi wires exhibited a lower kinetic frictional resistance compared to the uncoated controls. All NiTi palladium coated wires were significantly (PConclusions . Coated stainless steel archwires exhibited an increase in frictional resistance compared to uncoated stainless steel archwires, while coated nickel-titanium archwires exhibited a decrease in frictional resistance compared to uncoated nickel-titanium archwires. After eight minutes of abrasion there was an increased frictional resistance of palladium coated archwires and decreased frictional resistance of epoxy and polymer coated archwires.


Coatings – Testing; Epoxy coatings; Health and environmental sciences; Mechanical wear; Orthodontic appliances; Orthodontics; Plastic coating; Toothbrushes


Dental Materials | Dentistry | Orthodontics and Orthodontology

File Format


Degree Grantor

University of Nevada, Las Vegas




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