Determination Of Optimum Adhesive Thickness Using Varying Degree Of Force Application With Light Cure Adhesive And Its Effect On Shear Bond Strength Of Orthodontic Bracket – An In vitro Study

Jain, Mahesh and Shetty, Siddarth and Mogra, Subraya and Shetty, Surendra V. (2013) Determination Of Optimum Adhesive Thickness Using Varying Degree Of Force Application With Light Cure Adhesive And Its Effect On Shear Bond Strength Of Orthodontic Bracket – An In vitro Study. Orthodontics, 14 (1). e40-e49.

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Abstract

Aim:The thickness of the adhesive layer under a bracket may be important factor which affects the final tooth position and bond strength. With increasing use of pre-adjusted brackets, it is important to ensure a consistently even layer of composite is placed under each bracket to take full advantage of bracket design and to avoid the need for compensatory bends to be placed in the arch wire. Therefore, the present study aimed at determining the optimum adhesive thickness by varying the force of application and its effect on shear bond strength of orthodontic bracket. Materials&Methods: 60 premolars extracted for orthodontic purpose were divided into three groups of 20 samples each. Adhesive thickness was measured by varying the force of application while bonding brackets with light cured adhesive and tested on universal testing machine to evaluate the shear bond strength. Results:The study showed that adhesive thickness is inversely proportional to applied force. The present study also revealed that shear bond strength has a tendency to increase with decrease in adhesive thickness to a certain extent and then it decreases. Conclusions: Adhesive thickness between bracket base and tooth surface decreases with an increase in the amount of force application from 1 to 3 oz. Mean shear bond strength increases when adhesive thickness decreases from 0.99 to 0.83 mm, and then it has a tendency to decrease when adhesive thickness decreases to 0.72 mm. Optimum adhesive thickness should be considered to be 0.83 mm, which is the thickness required to achieve sufficient bond strength to prevent chances of bond failure.

Item Type: Article
Uncontrolled Keywords: Adhesive thickness, force application , shear bond strength
Subjects: Dentistry > MCODS Mangalore > Orthodontics
Depositing User: KMCMLR User
Date Deposited: 22 Jun 2013 05:20
Last Modified: 22 Jun 2013 05:20
URI: http://eprints.manipal.edu/id/eprint/136356

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