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Quintess ence Publishing: Journals: ORTHODONTICS

ORTHODONTICS

The Art and Practice of Dentofacial Enhancement

Formerly World Journal of Orthodontics

Edited by

Rafi Romano, DMD, MSc (Editor-in-Chief)

ISSN 2160-2999 (print) / ISSN 2160-3006 (online)

Visit the ORTHODONTICS: The Art and Practice of Dentofacial

EnhancementFacebook page

Publication:

Yearbook 2013

Volum e 14 , Issue 1

Back

Dete rmination of optimum adhesive thicknes s us ing varying degrees of force application w ith light-

cured adhesive and its effe ct on the she ar bond strength of orthodontic brackets: An in vitro study

Mahesh Jain, MDS/Siddarth Shetty , MDS/Subraya Mogra, MDS/V. Surendra Shetty, MDS/Nidhi Dhakar

DOI: 10.11607/ortho.919

Aim: The thickness of the adhesive layer under a bracket may be an important factor that aff ects the f inal tooth

position and bond strength. With increasinguse of preadjusted brackets, it is important to ensure that 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 archw ire. Therefore, the present study is aimed at determining the

optimum adhesive thickness by varying the force of application and observing the eff ect on the shear bond strength

of orthodontic brackets. Methods: Sixty premolars extracted for orthodontic purposes w ere divided into three groups

of 20 samples each. Adhesive thickness w as measured by varying the force of application while bonding brackets

w ith light-cured adhesive and tested on a universal testing machine to evaluate the shear bond strength. Results: The

study showed that adhesive thickness is inversely proportional to applied force. In addition, the shear bond strength

has a tendency to increase w ith a decrease in adhesive thickness up to a certain extent and then decrease.

Conclusion: Adhesive thickness between bracket base and tooth surface decreases w ith an increase in the amount

of force application from 1 to 3 oz. Mean shear bond strength increases w hen 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, w hich is the thickness required to achieve suf ficient bond

strength to prevent chances ofbond failure. ORTHODONTICS (CHIC) 2013;14:e40e49. doi: 10.11607/ortho.919

Key w ords: adhesive thickness, force application, shear bond strength

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2013 Quintessence Publis hing Co Inc

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