Related Experiment Video
Updated: Jan 31, 2026
Studying Orthodontic Tooth Movement in Mice
Published on: August 2, 2024
Does the antioxidant treatment affect the shear bond strength of orthodontic brackets: An in vitro study
Abeer Abdullah Alrafaa1, Rabia Bilal2, Ibrahim Alshahrani3
1College of Dentistry, Qassim University.
Objective:
To determine the shear bond strength of orthodontic brackets after anti-oxidant treatment on previously bleached teeth..
Methods:
The experimental in-vitro study was conducted in Saudi Arabiaat Qassim University, Al-Qassim, and King Saud University, Riyadh, from December 2016 to March 2017, and comprised extracted maxillary and mandibular premolars which were divided randomly into three groups. In Group A, which was the control group, the teeth were etched and bonded, while those in Group B were bleached, etched and bonded. Group C was subjected to bleaching, followed by treatment with anti-oxidant 10% sodium ascorbate solution, then etched and bonded. All three groups were then tested and analysed for bond strength using the Instron, Universal testing machine. SPSS 23 was used for data analysis..
Results:
There were 60 teeth with 20(33.3%) in each of the three groups. Group C had the maximum mean shear bond strength of 12.231}2.1Mpa, followed by Group A with 10.948+/-2.1Mpa and Group B with 7.621}1.8Mpa.
Conclusions:
Anti-oxidant treatment had a positive effect on the shear bond strength of orthodontic brackets after tooth bleaching. Keywords: Anti-oxidant. Bleaching, Brackets, Extracted premolars, Shear bond strength.
Related Concept Videos
01:12Bonding and Strength of Aggregate
00:42Ionic Bonds
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
02:49Bond Energies and Bond Lengths
03:05Acid Strength and Molecular Structure
In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with increasing...
02:48Ionic Bonding and Electron Transfer
02:43Peptide Bonds