Title
Effect of light-emitting diode curing tip distance on shear bond strength in metal, ceramic and polycarbonate orthodontic brackets: An in vitro study
Authors
S. Hemadri1, S.V. Kala Vani1,*, Firoz Babu Palagiri1, Vijaysinh R. Tanpure2, V. Lakshmi Sagar1 & N. Thejaswini1
Affiliation
1Department of Orthodontics, CKS Teja Institute of Dental Sciences and Research, Tirupati, Andhra Pradesh, India; 2Department of Orthodontics, Yashwantrao Chavan Dental College, Ahilyanagar, Maharashtra, India; *Corresponding author
S. Hemadri - E-mail: sch.hemaadri@gmail.com
S.V. Kala Vani - E-mail: drsvkvani@gmail.com
Firoz Babu Palagiri - E-mail: firozbabumds@gmail.com
Vijaysinh R. Tanpure - E-mail: rajetanpure@gmail.com
V. Lakshmi Sagar - E-mail: laxmisaagar@gmail.com
N. Thejaswini - E-mail: nsteju90@gmail.com
Article Type
Research Article
Date
Received May 1, 2026; Revised May 31, 2026; Accepted May 31, 2026, Published May 31, 2026
Abstract
Adequate shear bond strength between orthodontic brackets and enamel is essential for successful treatment. However, the effect of LED curing tip distance on different bracket materials remains unclear. Therefore, it is of interest to evaluate the shear bond strength of stainless-steel, polycarbonate and monocrystalline ceramic and polycrystalline brackets at varying LED curing distances. Two hundred premolars were divided by bracket type and curing distances (0, 6, 8, 10 and 15 mm) and bond strength was tested using a universal testing machine. Results showed high bond strength at 0 mm with a significant reduction as distance increased, with stainless-steel and ceramic brackets maintaining clinically acceptable values while polycarbonate brackets showed reduced strength at greater distances. Both bracket material and curing distance significantly influenced shear bond strength, emphasizing the need to minimize curing distance for optimal bonding performance.
Keywords
Orthodontic brackets, shear bond strength, LED curing, distance between curing tip, ceramic brackets, polycarbonate brackets
Citation
Hemadri et al. Bioinformation 22(5): 2750-2755 (2026)
Edited by
Hiroj Bagde
ISSN
0973-2063
Publisher
License
This is an Open Access article which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. This is distributed under the terms of the Creative Commons Attribution License.
