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Oral Sphere

Journal of Dental and Health Sciences

COPE Member

Exploring Curing Distances and Their Influence on Orthodontic Bracket Bond Strength: In Vitro Research

Volume 2, Issue 1 - 2026

Original Research

Anila Rupa Kujur, Simran Suhani, Chandra Lekha

Received: 2025-09-17

Accepted: 2025-11-30

Published: 2026-01-01

DOI: 10.63150/osjdhs.2026.04

Pages: 22-29

Abstract

Background: The field of orthodontics has undergone significant changes, particularly with the development of bonding systems, which have revolutionized the way treatment is carried out. This study examines the remaining bonding and adhesive remnant index (ARI) of stainless steel and Radiance Plus ceramic brackets at different curing distances, which helps focus the curing protocol in orthodontics.

Objective: To examine shear bond strength and ARI of stainless steel and Radiance Plus ceramic brackets at varying distances of light curing (0, 5, and 10 mm).

Methods: Throughout the research study, 120 extracted human premolar teeth were arranged randomly and classified into two groups consisting of 60 teeth each. Group A consisted of stainless-steel brackets, while Group B consisted of Radiance Plus ceramic brackets. These groups were split further in turns of different distances and curing brackets, which were, 0 mm, 5 mm, and 10 mm distances. The Trumpbond XT bonding adhesive was used and curing was accomplished utilizing the high-intensity 3M ESPE Elipar LED curing light. The shear bond strength was measured and assessed using the Instron Universal Testing Machine. The ARI was evaluated by a stereomicroscope that was 20x magnification.

Results: Radiance Plus ceramic brackets showed significantly higher bond strength at all distances compared to stainless steel brackets. As the distance curing brackets increased, bond strength decreased for both types of brackets, but ceramic brackets exhibited better bond strength at every single distance. The ARI scores indicated that, for failed bonds with stainless steel brackets, bond failure was more likely to occur at the bracket–adhesive interface. In contrast, for ceramic brackets, the majority of the adhesive remained on the tooth surface, suggesting failure at the enamel–adhesive interface.

Conclusion: The focus of this research is on how critical the proper distance for curing is, and the right materials for curing are to get the best results for orthodontics. Radiance Plus ceramic brackets achieve the best results for bond strength when compared to stainless steel brackets, and this is particularly true when curing is done at shorter distances.

Keywords: Adhesive Remnant Index, Bond Strength, Ceramic Brackets, Light Curing, Stainless Steel Brackets

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