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Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie

Published in:

19-08-2021 | Original Article

Effects of fluorosed enamel on orthodontic bracket bonding

An in vitro study

Authors: Amal Basalamah, Ahmed Maher, Ahmed Hamdy Whba, Andrea Scribante, Maria Francesca Sfondrini, Dr. Mona A. Montasser

Published in: Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie | Issue 2/2023

Abstract

Objective

To investigate the effect of enamel deproteinization and air abrasion on shear bond strength (SBS), adhesive remnant index (ARI) scores, and surface topography when bonding orthodontic brackets to fluorosed enamel.

Materials and methods

The sample included 90 fluorosed and 30 normal premolars divided into four groups: group I (fluorosed premolars subjected to air abrasion before acid etching), group II (fluorosed premolars subjected to deproteinization before acid etching), group III (fluorosed premolars; control for groups I and II), and group IV (normal premolars; control for group III). Bonding procedures included etching with 37% phosphoric acid, priming with Transbond^TM XT primer (3M Unitek, Monrovia, CA, USA), and application of Transbond^TM XT adhesive paste (composite; 3M Unitek, Monrovia, CA, USA). Air abrasion was done using 50 µm aluminum oxide particles under 0.28 MPa pressure for 5 s with the micro-etcher held at a distance of 10 mm. Deproteinization was done for 60 s with 5% sodium hypochlorite (NaOCl).

Results

Fluorosed premolars subjected to deproteinization showed the lowest (median = 6.57 MPa) SBS among the four groups, followed by 8.14, 8.90, 8.14 MPa for groups I, III, and IV respectively. ARI scores were significantly different between the four groups (p = 0.006). Fluorosed enamel etched after air abrasion or deproteinization with NaOCl showed a predominance of type 4 etching pattern with some areas appearing unetched.

Conclusions

Shear bond strength of all groups was within the 6–8 MPa acceptable range for orthodontic purposes. Fluorosed premolars subjected to deproteinization showed the lowest values. Further studies are recommended to scrutinize the deproteinization technique.

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Title: Effects of fluorosed enamel on orthodontic bracket bonding
An in vitro study
Authors: Amal Basalamah
Ahmed Maher
Ahmed Hamdy Whba
Andrea Scribante
Maria Francesca Sfondrini
Dr. Mona A. Montasser
Publication date: 19-08-2021
Publisher: Springer Medizin
Published in: Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie / Issue 2/2023
Print ISSN: 1434-5293
Electronic ISSN: 1615-6714
DOI: https://doi.org/10.1007/s00056-021-00342-x

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Effects of fluorosed enamel on orthodontic bracket bonding

An in vitro study

Abstract

Objective

Materials and methods

Results

Conclusions

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Objective

Materials and methods

Results

Conclusions

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